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

   1 /*******************************************************************************
   2  * Filename:  target_core_transport.c
   3  *
   4  * This file contains the Generic Target Engine Core.
   5  *
   6  * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
   7  * Copyright (c) 2005, 2006, 2007 SBE, Inc.
   8  * Copyright (c) 2007-2010 Rising Tide Systems
   9  * Copyright (c) 2008-2010 Linux-iSCSI.org
  10  *
  11  * Nicholas A. Bellinger <nab@kernel.org>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  *
  27  ******************************************************************************/
  28
  29 #include <linux/net.h>
  30 #include <linux/delay.h>
  31 #include <linux/string.h>
  32 #include <linux/timer.h>
  33 #include <linux/slab.h>
  34 #include <linux/blkdev.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/kthread.h>
  37 #include <linux/in.h>
  38 #include <linux/cdrom.h>
  39 #include <linux/module.h>
  40 #include <asm/unaligned.h>
  41 #include <net/sock.h>
  42 #include <net/tcp.h>
  43 #include <scsi/scsi.h>
  44 #include <scsi/scsi_cmnd.h>
  45 #include <scsi/scsi_tcq.h>
  46
  47 #include <target/target_core_base.h>
  48 #include <target/target_core_backend.h>
  49 #include <target/target_core_fabric.h>
  50 #include <target/target_core_configfs.h>
  51
  52 #include "target_core_internal.h"
  53 #include "target_core_alua.h"
  54 #include "target_core_pr.h"
  55 #include "target_core_ua.h"
  56
  57 static int sub_api_initialized;
  58
  59 static struct workqueue_struct *target_completion_wq;
  60 static struct kmem_cache *se_sess_cache;
  61 struct kmem_cache *se_tmr_req_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 void transport_free_dev_tasks(struct se_cmd *cmd);
  76 static int transport_generic_get_mem(struct se_cmd *cmd);
  77 static void transport_put_cmd(struct se_cmd *cmd);
  78 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
  79 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
  80 static void transport_generic_request_failure(struct se_cmd *);
  81 static void target_complete_ok_work(struct work_struct *work);
  82
  83 int init_se_kmem_caches(void)
  84 {
  85         se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
  86                         sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
  87                         0, NULL);
  88         if (!se_tmr_req_cache) {
  89                 pr_err("kmem_cache_create() for struct se_tmr_req"
  90                                 " failed\n");
  91                 goto out;
  92         }
  93         se_sess_cache = kmem_cache_create("se_sess_cache",
  94                         sizeof(struct se_session), __alignof__(struct se_session),
  95                         0, NULL);
  96         if (!se_sess_cache) {
  97                 pr_err("kmem_cache_create() for struct se_session"
  98                                 " failed\n");
  99                 goto out_free_tmr_req_cache;
 100         }
 101         se_ua_cache = kmem_cache_create("se_ua_cache",
 102                         sizeof(struct se_ua), __alignof__(struct se_ua),
 103                         0, NULL);
 104         if (!se_ua_cache) {
 105                 pr_err("kmem_cache_create() for struct se_ua failed\n");
 106                 goto out_free_sess_cache;
 107         }
 108         t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
 109                         sizeof(struct t10_pr_registration),
 110                         __alignof__(struct t10_pr_registration), 0, NULL);
 111         if (!t10_pr_reg_cache) {
 112                 pr_err("kmem_cache_create() for struct t10_pr_registration"
 113                                 " failed\n");
 114                 goto out_free_ua_cache;
 115         }
 116         t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
 117                         sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
 118                         0, NULL);
 119         if (!t10_alua_lu_gp_cache) {
 120                 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
 121                                 " failed\n");
 122                 goto out_free_pr_reg_cache;
 123         }
 124         t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
 125                         sizeof(struct t10_alua_lu_gp_member),
 126                         __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
 127         if (!t10_alua_lu_gp_mem_cache) {
 128                 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
 129                                 "cache failed\n");
 130                 goto out_free_lu_gp_cache;
 131         }
 132         t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
 133                         sizeof(struct t10_alua_tg_pt_gp),
 134                         __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
 135         if (!t10_alua_tg_pt_gp_cache) {
 136                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 137                                 "cache failed\n");
 138                 goto out_free_lu_gp_mem_cache;
 139         }
 140         t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
 141                         "t10_alua_tg_pt_gp_mem_cache",
 142                         sizeof(struct t10_alua_tg_pt_gp_member),
 143                         __alignof__(struct t10_alua_tg_pt_gp_member),
 144                         0, NULL);
 145         if (!t10_alua_tg_pt_gp_mem_cache) {
 146                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 147                                 "mem_t failed\n");
 148                 goto out_free_tg_pt_gp_cache;
 149         }
 150
 151         target_completion_wq = alloc_workqueue("target_completion",
 152                                                WQ_MEM_RECLAIM, 0);
 153         if (!target_completion_wq)
 154                 goto out_free_tg_pt_gp_mem_cache;
 155
 156         return 0;
 157
 158 out_free_tg_pt_gp_mem_cache:
 159         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 160 out_free_tg_pt_gp_cache:
 161         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 162 out_free_lu_gp_mem_cache:
 163         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 164 out_free_lu_gp_cache:
 165         kmem_cache_destroy(t10_alua_lu_gp_cache);
 166 out_free_pr_reg_cache:
 167         kmem_cache_destroy(t10_pr_reg_cache);
 168 out_free_ua_cache:
 169         kmem_cache_destroy(se_ua_cache);
 170 out_free_sess_cache:
 171         kmem_cache_destroy(se_sess_cache);
 172 out_free_tmr_req_cache:
 173         kmem_cache_destroy(se_tmr_req_cache);
 174 out:
 175         return -ENOMEM;
 176 }
 177
 178 void release_se_kmem_caches(void)
 179 {
 180         destroy_workqueue(target_completion_wq);
 181         kmem_cache_destroy(se_tmr_req_cache);
 182         kmem_cache_destroy(se_sess_cache);
 183         kmem_cache_destroy(se_ua_cache);
 184         kmem_cache_destroy(t10_pr_reg_cache);
 185         kmem_cache_destroy(t10_alua_lu_gp_cache);
 186         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 187         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 188         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 189 }
 190
 191 /* This code ensures unique mib indexes are handed out. */
 192 static DEFINE_SPINLOCK(scsi_mib_index_lock);
 193 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
 194
 195 /*
 196  * Allocate a new row index for the entry type specified
 197  */
 198 u32 scsi_get_new_index(scsi_index_t type)
 199 {
 200         u32 new_index;
 201
 202         BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
 203
 204         spin_lock(&scsi_mib_index_lock);
 205         new_index = ++scsi_mib_index[type];
 206         spin_unlock(&scsi_mib_index_lock);
 207
 208         return new_index;
 209 }
 210
 211 static void transport_init_queue_obj(struct se_queue_obj *qobj)
 212 {
 213         atomic_set(&qobj->queue_cnt, 0);
 214         INIT_LIST_HEAD(&qobj->qobj_list);
 215         init_waitqueue_head(&qobj->thread_wq);
 216         spin_lock_init(&qobj->cmd_queue_lock);
 217 }
 218
 219 void transport_subsystem_check_init(void)
 220 {
 221         int ret;
 222
 223         if (sub_api_initialized)
 224                 return;
 225
 226         ret = request_module("target_core_iblock");
 227         if (ret != 0)
 228                 pr_err("Unable to load target_core_iblock\n");
 229
 230         ret = request_module("target_core_file");
 231         if (ret != 0)
 232                 pr_err("Unable to load target_core_file\n");
 233
 234         ret = request_module("target_core_pscsi");
 235         if (ret != 0)
 236                 pr_err("Unable to load target_core_pscsi\n");
 237
 238         ret = request_module("target_core_stgt");
 239         if (ret != 0)
 240                 pr_err("Unable to load target_core_stgt\n");
 241
 242         sub_api_initialized = 1;
 243         return;
 244 }
 245
 246 struct se_session *transport_init_session(void)
 247 {
 248         struct se_session *se_sess;
 249
 250         se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
 251         if (!se_sess) {
 252                 pr_err("Unable to allocate struct se_session from"
 253                                 " se_sess_cache\n");
 254                 return ERR_PTR(-ENOMEM);
 255         }
 256         INIT_LIST_HEAD(&se_sess->sess_list);
 257         INIT_LIST_HEAD(&se_sess->sess_acl_list);
 258         INIT_LIST_HEAD(&se_sess->sess_cmd_list);
 259         INIT_LIST_HEAD(&se_sess->sess_wait_list);
 260         spin_lock_init(&se_sess->sess_cmd_lock);
 261
 262         return se_sess;
 263 }
 264 EXPORT_SYMBOL(transport_init_session);
 265
 266 /*
 267  * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
 268  */
 269 void __transport_register_session(
 270         struct se_portal_group *se_tpg,
 271         struct se_node_acl *se_nacl,
 272         struct se_session *se_sess,
 273         void *fabric_sess_ptr)
 274 {
 275         unsigned char buf[PR_REG_ISID_LEN];
 276
 277         se_sess->se_tpg = se_tpg;
 278         se_sess->fabric_sess_ptr = fabric_sess_ptr;
 279         /*
 280          * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
 281          *
 282          * Only set for struct se_session's that will actually be moving I/O.
 283          * eg: *NOT* discovery sessions.
 284          */
 285         if (se_nacl) {
 286                 /*
 287                  * If the fabric module supports an ISID based TransportID,
 288                  * save this value in binary from the fabric I_T Nexus now.
 289                  */
 290                 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
 291                         memset(&buf[0], 0, PR_REG_ISID_LEN);
 292                         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
 293                                         &buf[0], PR_REG_ISID_LEN);
 294                         se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
 295                 }
 296                 spin_lock_irq(&se_nacl->nacl_sess_lock);
 297                 /*
 298                  * The se_nacl->nacl_sess pointer will be set to the
 299                  * last active I_T Nexus for each struct se_node_acl.
 300                  */
 301                 se_nacl->nacl_sess = se_sess;
 302
 303                 list_add_tail(&se_sess->sess_acl_list,
 304                               &se_nacl->acl_sess_list);
 305                 spin_unlock_irq(&se_nacl->nacl_sess_lock);
 306         }
 307         list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
 308
 309         pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
 310                 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
 311 }
 312 EXPORT_SYMBOL(__transport_register_session);
 313
 314 void transport_register_session(
 315         struct se_portal_group *se_tpg,
 316         struct se_node_acl *se_nacl,
 317         struct se_session *se_sess,
 318         void *fabric_sess_ptr)
 319 {
 320         spin_lock_bh(&se_tpg->session_lock);
 321         __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
 322         spin_unlock_bh(&se_tpg->session_lock);
 323 }
 324 EXPORT_SYMBOL(transport_register_session);
 325
 326 void transport_deregister_session_configfs(struct se_session *se_sess)
 327 {
 328         struct se_node_acl *se_nacl;
 329         unsigned long flags;
 330         /*
 331          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
 332          */
 333         se_nacl = se_sess->se_node_acl;
 334         if (se_nacl) {
 335                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
 336                 list_del(&se_sess->sess_acl_list);
 337                 /*
 338                  * If the session list is empty, then clear the pointer.
 339                  * Otherwise, set the struct se_session pointer from the tail
 340                  * element of the per struct se_node_acl active session list.
 341                  */
 342                 if (list_empty(&se_nacl->acl_sess_list))
 343                         se_nacl->nacl_sess = NULL;
 344                 else {
 345                         se_nacl->nacl_sess = container_of(
 346                                         se_nacl->acl_sess_list.prev,
 347                                         struct se_session, sess_acl_list);
 348                 }
 349                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
 350         }
 351 }
 352 EXPORT_SYMBOL(transport_deregister_session_configfs);
 353
 354 void transport_free_session(struct se_session *se_sess)
 355 {
 356         kmem_cache_free(se_sess_cache, se_sess);
 357 }
 358 EXPORT_SYMBOL(transport_free_session);
 359
 360 void transport_deregister_session(struct se_session *se_sess)
 361 {
 362         struct se_portal_group *se_tpg = se_sess->se_tpg;
 363         struct se_node_acl *se_nacl;
 364         unsigned long flags;
 365
 366         if (!se_tpg) {
 367                 transport_free_session(se_sess);
 368                 return;
 369         }
 370
 371         spin_lock_irqsave(&se_tpg->session_lock, flags);
 372         list_del(&se_sess->sess_list);
 373         se_sess->se_tpg = NULL;
 374         se_sess->fabric_sess_ptr = NULL;
 375         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 376
 377         /*
 378          * Determine if we need to do extra work for this initiator node's
 379          * struct se_node_acl if it had been previously dynamically generated.
 380          */
 381         se_nacl = se_sess->se_node_acl;
 382         if (se_nacl) {
 383                 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 384                 if (se_nacl->dynamic_node_acl) {
 385                         if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
 386                                         se_tpg)) {
 387                                 list_del(&se_nacl->acl_list);
 388                                 se_tpg->num_node_acls--;
 389                                 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 390
 391                                 core_tpg_wait_for_nacl_pr_ref(se_nacl);
 392                                 core_free_device_list_for_node(se_nacl, se_tpg);
 393                                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
 394                                                 se_nacl);
 395                                 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 396                         }
 397                 }
 398                 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 399         }
 400
 401         transport_free_session(se_sess);
 402
 403         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
 404                 se_tpg->se_tpg_tfo->get_fabric_name());
 405 }
 406 EXPORT_SYMBOL(transport_deregister_session);
 407
 408 /*
 409  * Called with cmd->t_state_lock held.
 410  */
 411 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
 412 {
 413         struct se_device *dev = cmd->se_dev;
 414         struct se_task *task;
 415         unsigned long flags;
 416
 417         if (!dev)
 418                 return;
 419
 420         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 421                 if (task->task_flags & TF_ACTIVE)
 422                         continue;
 423
 424                 spin_lock_irqsave(&dev->execute_task_lock, flags);
 425                 if (task->t_state_active) {
 426                         pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
 427                                 cmd->se_tfo->get_task_tag(cmd), dev, task);
 428
 429                         list_del(&task->t_state_list);
 430                         atomic_dec(&cmd->t_task_cdbs_ex_left);
 431                         task->t_state_active = false;
 432                 }
 433                 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 434         }
 435
 436 }
 437
 438 /*      transport_cmd_check_stop():
 439  *
 440  *      'transport_off = 1' determines if t_transport_active should be cleared.
 441  *      'transport_off = 2' determines if task_dev_state should be removed.
 442  *
 443  *      A non-zero u8 t_state sets cmd->t_state.
 444  *      Returns 1 when command is stopped, else 0.
 445  */
 446 static int transport_cmd_check_stop(
 447         struct se_cmd *cmd,
 448         int transport_off,
 449         u8 t_state)
 450 {
 451         unsigned long flags;
 452
 453         spin_lock_irqsave(&cmd->t_state_lock, flags);
 454         /*
 455          * Determine if IOCTL context caller in requesting the stopping of this
 456          * command for LUN shutdown purposes.
 457          */
 458         if (atomic_read(&cmd->transport_lun_stop)) {
 459                 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
 460                         " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
 461                         cmd->se_tfo->get_task_tag(cmd));
 462
 463                 atomic_set(&cmd->t_transport_active, 0);
 464                 if (transport_off == 2)
 465                         transport_all_task_dev_remove_state(cmd);
 466                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 467
 468                 complete(&cmd->transport_lun_stop_comp);
 469                 return 1;
 470         }
 471         /*
 472          * Determine if frontend context caller is requesting the stopping of
 473          * this command for frontend exceptions.
 474          */
 475         if (atomic_read(&cmd->t_transport_stop)) {
 476                 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
 477                         " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
 478                         cmd->se_tfo->get_task_tag(cmd));
 479
 480                 if (transport_off == 2)
 481                         transport_all_task_dev_remove_state(cmd);
 482
 483                 /*
 484                  * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
 485                  * to FE.
 486                  */
 487                 if (transport_off == 2)
 488                         cmd->se_lun = NULL;
 489                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 490
 491                 complete(&cmd->t_transport_stop_comp);
 492                 return 1;
 493         }
 494         if (transport_off) {
 495                 atomic_set(&cmd->t_transport_active, 0);
 496                 if (transport_off == 2) {
 497                         transport_all_task_dev_remove_state(cmd);
 498                         /*
 499                          * Clear struct se_cmd->se_lun before the transport_off == 2
 500                          * handoff to fabric module.
 501                          */
 502                         cmd->se_lun = NULL;
 503                         /*
 504                          * Some fabric modules like tcm_loop can release
 505                          * their internally allocated I/O reference now and
 506                          * struct se_cmd now.
 507                          *
 508                          * Fabric modules are expected to return '1' here if the
 509                          * se_cmd being passed is released at this point,
 510                          * or zero if not being released.
 511                          */
 512                         if (cmd->se_tfo->check_stop_free != NULL) {
 513                                 spin_unlock_irqrestore(
 514                                         &cmd->t_state_lock, flags);
 515
 516                                 return cmd->se_tfo->check_stop_free(cmd);
 517                         }
 518                 }
 519                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 520
 521                 return 0;
 522         } else if (t_state)
 523                 cmd->t_state = t_state;
 524         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 525
 526         return 0;
 527 }
 528
 529 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 530 {
 531         return transport_cmd_check_stop(cmd, 2, 0);
 532 }
 533
 534 static void transport_lun_remove_cmd(struct se_cmd *cmd)
 535 {
 536         struct se_lun *lun = cmd->se_lun;
 537         unsigned long flags;
 538
 539         if (!lun)
 540                 return;
 541
 542         spin_lock_irqsave(&cmd->t_state_lock, flags);
 543         if (!atomic_read(&cmd->transport_dev_active)) {
 544                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 545                 goto check_lun;
 546         }
 547         atomic_set(&cmd->transport_dev_active, 0);
 548         transport_all_task_dev_remove_state(cmd);
 549         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 550
 551
 552 check_lun:
 553         spin_lock_irqsave(&lun->lun_cmd_lock, flags);
 554         if (atomic_read(&cmd->transport_lun_active)) {
 555                 list_del(&cmd->se_lun_node);
 556                 atomic_set(&cmd->transport_lun_active, 0);
 557 #if 0
 558                 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
 559                         cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
 560 #endif
 561         }
 562         spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
 563 }
 564
 565 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 566 {
 567         if (!cmd->se_tmr_req)
 568                 transport_lun_remove_cmd(cmd);
 569
 570         if (transport_cmd_check_stop_to_fabric(cmd))
 571                 return;
 572         if (remove) {
 573                 transport_remove_cmd_from_queue(cmd);
 574                 transport_put_cmd(cmd);
 575         }
 576 }
 577
 578 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
 579                 bool at_head)
 580 {
 581         struct se_device *dev = cmd->se_dev;
 582         struct se_queue_obj *qobj = &dev->dev_queue_obj;
 583         unsigned long flags;
 584
 585         if (t_state) {
 586                 spin_lock_irqsave(&cmd->t_state_lock, flags);
 587                 cmd->t_state = t_state;
 588                 atomic_set(&cmd->t_transport_active, 1);
 589                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 590         }
 591
 592         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 593
 594         /* If the cmd is already on the list, remove it before we add it */
 595         if (!list_empty(&cmd->se_queue_node))
 596                 list_del(&cmd->se_queue_node);
 597         else
 598                 atomic_inc(&qobj->queue_cnt);
 599
 600         if (at_head)
 601                 list_add(&cmd->se_queue_node, &qobj->qobj_list);
 602         else
 603                 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
 604         atomic_set(&cmd->t_transport_queue_active, 1);
 605         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 606
 607         wake_up_interruptible(&qobj->thread_wq);
 608 }
 609
 610 static struct se_cmd *
 611 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
 612 {
 613         struct se_cmd *cmd;
 614         unsigned long flags;
 615
 616         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 617         if (list_empty(&qobj->qobj_list)) {
 618                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 619                 return NULL;
 620         }
 621         cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
 622
 623         atomic_set(&cmd->t_transport_queue_active, 0);
 624
 625         list_del_init(&cmd->se_queue_node);
 626         atomic_dec(&qobj->queue_cnt);
 627         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 628
 629         return cmd;
 630 }
 631
 632 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
 633 {
 634         struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
 635         unsigned long flags;
 636
 637         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 638         if (!atomic_read(&cmd->t_transport_queue_active)) {
 639                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 640                 return;
 641         }
 642         atomic_set(&cmd->t_transport_queue_active, 0);
 643         atomic_dec(&qobj->queue_cnt);
 644         list_del_init(&cmd->se_queue_node);
 645         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 646
 647         if (atomic_read(&cmd->t_transport_queue_active)) {
 648                 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
 649                         cmd->se_tfo->get_task_tag(cmd),
 650                         atomic_read(&cmd->t_transport_queue_active));
 651         }
 652 }
 653
 654 /*
 655  * Completion function used by TCM subsystem plugins (such as FILEIO)
 656  * for queueing up response from struct se_subsystem_api->do_task()
 657  */
 658 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
 659 {
 660         struct se_task *task = list_entry(cmd->t_task_list.next,
 661                                 struct se_task, t_list);
 662
 663         if (good) {
 664                 cmd->scsi_status = SAM_STAT_GOOD;
 665                 task->task_scsi_status = GOOD;
 666         } else {
 667                 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
 668                 task->task_se_cmd->scsi_sense_reason =
 669                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 670
 671         }
 672
 673         transport_complete_task(task, good);
 674 }
 675 EXPORT_SYMBOL(transport_complete_sync_cache);
 676
 677 static void target_complete_failure_work(struct work_struct *work)
 678 {
 679         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
 680
 681         transport_generic_request_failure(cmd);
 682 }
 683
 684 /*      transport_complete_task():
 685  *
 686  *      Called from interrupt and non interrupt context depending
 687  *      on the transport plugin.
 688  */
 689 void transport_complete_task(struct se_task *task, int success)
 690 {
 691         struct se_cmd *cmd = task->task_se_cmd;
 692         struct se_device *dev = cmd->se_dev;
 693         unsigned long flags;
 694
 695         spin_lock_irqsave(&cmd->t_state_lock, flags);
 696         task->task_flags &= ~TF_ACTIVE;
 697
 698         /*
 699          * See if any sense data exists, if so set the TASK_SENSE flag.
 700          * Also check for any other post completion work that needs to be
 701          * done by the plugins.
 702          */
 703         if (dev && dev->transport->transport_complete) {
 704                 if (dev->transport->transport_complete(task) != 0) {
 705                         cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 706                         task->task_flags |= TF_HAS_SENSE;
 707                         success = 1;
 708                 }
 709         }
 710
 711         /*
 712          * See if we are waiting for outstanding struct se_task
 713          * to complete for an exception condition
 714          */
 715         if (task->task_flags & TF_REQUEST_STOP) {
 716                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 717                 complete(&task->task_stop_comp);
 718                 return;
 719         }
 720
 721         if (!success)
 722                 cmd->t_tasks_failed = 1;
 723
 724         /*
 725          * Decrement the outstanding t_task_cdbs_left count.  The last
 726          * struct se_task from struct se_cmd will complete itself into the
 727          * device queue depending upon int success.
 728          */
 729         if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
 730                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 731                 return;
 732         }
 733
 734         if (cmd->t_tasks_failed) {
 735                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 736                 INIT_WORK(&cmd->work, target_complete_failure_work);
 737         } else {
 738                 atomic_set(&cmd->t_transport_complete, 1);
 739                 INIT_WORK(&cmd->work, target_complete_ok_work);
 740         }
 741
 742         cmd->t_state = TRANSPORT_COMPLETE;
 743         atomic_set(&cmd->t_transport_active, 1);
 744         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 745
 746         queue_work(target_completion_wq, &cmd->work);
 747 }
 748 EXPORT_SYMBOL(transport_complete_task);
 749
 750 /*
 751  * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
 752  * struct se_task list are ready to be added to the active execution list
 753  * struct se_device
 754
 755  * Called with se_dev_t->execute_task_lock called.
 756  */
 757 static inline int transport_add_task_check_sam_attr(
 758         struct se_task *task,
 759         struct se_task *task_prev,
 760         struct se_device *dev)
 761 {
 762         /*
 763          * No SAM Task attribute emulation enabled, add to tail of
 764          * execution queue
 765          */
 766         if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
 767                 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
 768                 return 0;
 769         }
 770         /*
 771          * HEAD_OF_QUEUE attribute for received CDB, which means
 772          * the first task that is associated with a struct se_cmd goes to
 773          * head of the struct se_device->execute_task_list, and task_prev
 774          * after that for each subsequent task
 775          */
 776         if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
 777                 list_add(&task->t_execute_list,
 778                                 (task_prev != NULL) ?
 779                                 &task_prev->t_execute_list :
 780                                 &dev->execute_task_list);
 781
 782                 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
 783                                 " in execution queue\n",
 784                                 task->task_se_cmd->t_task_cdb[0]);
 785                 return 1;
 786         }
 787         /*
 788          * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
 789          * transitioned from Dermant -> Active state, and are added to the end
 790          * of the struct se_device->execute_task_list
 791          */
 792         list_add_tail(&task->t_execute_list, &dev->execute_task_list);
 793         return 0;
 794 }
 795
 796 /*      __transport_add_task_to_execute_queue():
 797  *
 798  *      Called with se_dev_t->execute_task_lock called.
 799  */
 800 static void __transport_add_task_to_execute_queue(
 801         struct se_task *task,
 802         struct se_task *task_prev,
 803         struct se_device *dev)
 804 {
 805         int head_of_queue;
 806
 807         head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
 808         atomic_inc(&dev->execute_tasks);
 809
 810         if (task->t_state_active)
 811                 return;
 812         /*
 813          * Determine if this task needs to go to HEAD_OF_QUEUE for the
 814          * state list as well.  Running with SAM Task Attribute emulation
 815          * will always return head_of_queue == 0 here
 816          */
 817         if (head_of_queue)
 818                 list_add(&task->t_state_list, (task_prev) ?
 819                                 &task_prev->t_state_list :
 820                                 &dev->state_task_list);
 821         else
 822                 list_add_tail(&task->t_state_list, &dev->state_task_list);
 823
 824         task->t_state_active = true;
 825
 826         pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
 827                 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
 828                 task, dev);
 829 }
 830
 831 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
 832 {
 833         struct se_device *dev = cmd->se_dev;
 834         struct se_task *task;
 835         unsigned long flags;
 836
 837         spin_lock_irqsave(&cmd->t_state_lock, flags);
 838         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 839                 spin_lock(&dev->execute_task_lock);
 840                 if (!task->t_state_active) {
 841                         list_add_tail(&task->t_state_list,
 842                                       &dev->state_task_list);
 843                         task->t_state_active = true;
 844
 845                         pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
 846                                 task->task_se_cmd->se_tfo->get_task_tag(
 847                                 task->task_se_cmd), task, dev);
 848                 }
 849                 spin_unlock(&dev->execute_task_lock);
 850         }
 851         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 852 }
 853
 854 static void __transport_add_tasks_from_cmd(struct se_cmd *cmd)
 855 {
 856         struct se_device *dev = cmd->se_dev;
 857         struct se_task *task, *task_prev = NULL;
 858
 859         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 860                 if (!list_empty(&task->t_execute_list))
 861                         continue;
 862                 /*
 863                  * __transport_add_task_to_execute_queue() handles the
 864                  * SAM Task Attribute emulation if enabled
 865                  */
 866                 __transport_add_task_to_execute_queue(task, task_prev, dev);
 867                 task_prev = task;
 868         }
 869 }
 870
 871 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
 872 {
 873         unsigned long flags;
 874         struct se_device *dev = cmd->se_dev;
 875
 876         spin_lock_irqsave(&dev->execute_task_lock, flags);
 877         __transport_add_tasks_from_cmd(cmd);
 878         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 879 }
 880
 881 void __transport_remove_task_from_execute_queue(struct se_task *task,
 882                 struct se_device *dev)
 883 {
 884         list_del_init(&task->t_execute_list);
 885         atomic_dec(&dev->execute_tasks);
 886 }
 887
 888 static void transport_remove_task_from_execute_queue(
 889         struct se_task *task,
 890         struct se_device *dev)
 891 {
 892         unsigned long flags;
 893
 894         if (WARN_ON(list_empty(&task->t_execute_list)))
 895                 return;
 896
 897         spin_lock_irqsave(&dev->execute_task_lock, flags);
 898         __transport_remove_task_from_execute_queue(task, dev);
 899         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 900 }
 901
 902 /*
 903  * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
 904  */
 905
 906 static void target_qf_do_work(struct work_struct *work)
 907 {
 908         struct se_device *dev = container_of(work, struct se_device,
 909                                         qf_work_queue);
 910         LIST_HEAD(qf_cmd_list);
 911         struct se_cmd *cmd, *cmd_tmp;
 912
 913         spin_lock_irq(&dev->qf_cmd_lock);
 914         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 915         spin_unlock_irq(&dev->qf_cmd_lock);
 916
 917         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 918                 list_del(&cmd->se_qf_node);
 919                 atomic_dec(&dev->dev_qf_count);
 920                 smp_mb__after_atomic_dec();
 921
 922                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 923                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 924                         (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 925                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 926                         : "UNKNOWN");
 927
 928                 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
 929         }
 930 }
 931
 932 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 933 {
 934         switch (cmd->data_direction) {
 935         case DMA_NONE:
 936                 return "NONE";
 937         case DMA_FROM_DEVICE:
 938                 return "READ";
 939         case DMA_TO_DEVICE:
 940                 return "WRITE";
 941         case DMA_BIDIRECTIONAL:
 942                 return "BIDI";
 943         default:
 944                 break;
 945         }
 946
 947         return "UNKNOWN";
 948 }
 949
 950 void transport_dump_dev_state(
 951         struct se_device *dev,
 952         char *b,
 953         int *bl)
 954 {
 955         *bl += sprintf(b + *bl, "Status: ");
 956         switch (dev->dev_status) {
 957         case TRANSPORT_DEVICE_ACTIVATED:
 958                 *bl += sprintf(b + *bl, "ACTIVATED");
 959                 break;
 960         case TRANSPORT_DEVICE_DEACTIVATED:
 961                 *bl += sprintf(b + *bl, "DEACTIVATED");
 962                 break;
 963         case TRANSPORT_DEVICE_SHUTDOWN:
 964                 *bl += sprintf(b + *bl, "SHUTDOWN");
 965                 break;
 966         case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
 967         case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
 968                 *bl += sprintf(b + *bl, "OFFLINE");
 969                 break;
 970         default:
 971                 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
 972                 break;
 973         }
 974
 975         *bl += sprintf(b + *bl, "  Execute/Max Queue Depth: %d/%d",
 976                 atomic_read(&dev->execute_tasks), dev->queue_depth);
 977         *bl += sprintf(b + *bl, "  SectorSize: %u  MaxSectors: %u\n",
 978                 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
 979         *bl += sprintf(b + *bl, "        ");
 980 }
 981
 982 void transport_dump_vpd_proto_id(
 983         struct t10_vpd *vpd,
 984         unsigned char *p_buf,
 985         int p_buf_len)
 986 {
 987         unsigned char buf[VPD_TMP_BUF_SIZE];
 988         int len;
 989
 990         memset(buf, 0, VPD_TMP_BUF_SIZE);
 991         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
 992
 993         switch (vpd->protocol_identifier) {
 994         case 0x00:
 995                 sprintf(buf+len, "Fibre Channel\n");
 996                 break;
 997         case 0x10:
 998                 sprintf(buf+len, "Parallel SCSI\n");
 999                 break;
1000         case 0x20:
1001                 sprintf(buf+len, "SSA\n");
1002                 break;
1003         case 0x30:
1004                 sprintf(buf+len, "IEEE 1394\n");
1005                 break;
1006         case 0x40:
1007                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1008                                 " Protocol\n");
1009                 break;
1010         case 0x50:
1011                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1012                 break;
1013         case 0x60:
1014                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1015                 break;
1016         case 0x70:
1017                 sprintf(buf+len, "Automation/Drive Interface Transport"
1018                                 " Protocol\n");
1019                 break;
1020         case 0x80:
1021                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1022                 break;
1023         default:
1024                 sprintf(buf+len, "Unknown 0x%02x\n",
1025                                 vpd->protocol_identifier);
1026                 break;
1027         }
1028
1029         if (p_buf)
1030                 strncpy(p_buf, buf, p_buf_len);
1031         else
1032                 pr_debug("%s", buf);
1033 }
1034
1035 void
1036 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1037 {
1038         /*
1039          * Check if the Protocol Identifier Valid (PIV) bit is set..
1040          *
1041          * from spc3r23.pdf section 7.5.1
1042          */
1043          if (page_83[1] & 0x80) {
1044                 vpd->protocol_identifier = (page_83[0] & 0xf0);
1045                 vpd->protocol_identifier_set = 1;
1046                 transport_dump_vpd_proto_id(vpd, NULL, 0);
1047         }
1048 }
1049 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1050
1051 int transport_dump_vpd_assoc(
1052         struct t10_vpd *vpd,
1053         unsigned char *p_buf,
1054         int p_buf_len)
1055 {
1056         unsigned char buf[VPD_TMP_BUF_SIZE];
1057         int ret = 0;
1058         int len;
1059
1060         memset(buf, 0, VPD_TMP_BUF_SIZE);
1061         len = sprintf(buf, "T10 VPD Identifier Association: ");
1062
1063         switch (vpd->association) {
1064         case 0x00:
1065                 sprintf(buf+len, "addressed logical unit\n");
1066                 break;
1067         case 0x10:
1068                 sprintf(buf+len, "target port\n");
1069                 break;
1070         case 0x20:
1071                 sprintf(buf+len, "SCSI target device\n");
1072                 break;
1073         default:
1074                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1075                 ret = -EINVAL;
1076                 break;
1077         }
1078
1079         if (p_buf)
1080                 strncpy(p_buf, buf, p_buf_len);
1081         else
1082                 pr_debug("%s", buf);
1083
1084         return ret;
1085 }
1086
1087 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1088 {
1089         /*
1090          * The VPD identification association..
1091          *
1092          * from spc3r23.pdf Section 7.6.3.1 Table 297
1093          */
1094         vpd->association = (page_83[1] & 0x30);
1095         return transport_dump_vpd_assoc(vpd, NULL, 0);
1096 }
1097 EXPORT_SYMBOL(transport_set_vpd_assoc);
1098
1099 int transport_dump_vpd_ident_type(
1100         struct t10_vpd *vpd,
1101         unsigned char *p_buf,
1102         int p_buf_len)
1103 {
1104         unsigned char buf[VPD_TMP_BUF_SIZE];
1105         int ret = 0;
1106         int len;
1107
1108         memset(buf, 0, VPD_TMP_BUF_SIZE);
1109         len = sprintf(buf, "T10 VPD Identifier Type: ");
1110
1111         switch (vpd->device_identifier_type) {
1112         case 0x00:
1113                 sprintf(buf+len, "Vendor specific\n");
1114                 break;
1115         case 0x01:
1116                 sprintf(buf+len, "T10 Vendor ID based\n");
1117                 break;
1118         case 0x02:
1119                 sprintf(buf+len, "EUI-64 based\n");
1120                 break;
1121         case 0x03:
1122                 sprintf(buf+len, "NAA\n");
1123                 break;
1124         case 0x04:
1125                 sprintf(buf+len, "Relative target port identifier\n");
1126                 break;
1127         case 0x08:
1128                 sprintf(buf+len, "SCSI name string\n");
1129                 break;
1130         default:
1131                 sprintf(buf+len, "Unsupported: 0x%02x\n",
1132                                 vpd->device_identifier_type);
1133                 ret = -EINVAL;
1134                 break;
1135         }
1136
1137         if (p_buf) {
1138                 if (p_buf_len < strlen(buf)+1)
1139                         return -EINVAL;
1140                 strncpy(p_buf, buf, p_buf_len);
1141         } else {
1142                 pr_debug("%s", buf);
1143         }
1144
1145         return ret;
1146 }
1147
1148 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1149 {
1150         /*
1151          * The VPD identifier type..
1152          *
1153          * from spc3r23.pdf Section 7.6.3.1 Table 298
1154          */
1155         vpd->device_identifier_type = (page_83[1] & 0x0f);
1156         return transport_dump_vpd_ident_type(vpd, NULL, 0);
1157 }
1158 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1159
1160 int transport_dump_vpd_ident(
1161         struct t10_vpd *vpd,
1162         unsigned char *p_buf,
1163         int p_buf_len)
1164 {
1165         unsigned char buf[VPD_TMP_BUF_SIZE];
1166         int ret = 0;
1167
1168         memset(buf, 0, VPD_TMP_BUF_SIZE);
1169
1170         switch (vpd->device_identifier_code_set) {
1171         case 0x01: /* Binary */
1172                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1173                         &vpd->device_identifier[0]);
1174                 break;
1175         case 0x02: /* ASCII */
1176                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1177                         &vpd->device_identifier[0]);
1178                 break;
1179         case 0x03: /* UTF-8 */
1180                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1181                         &vpd->device_identifier[0]);
1182                 break;
1183         default:
1184                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1185                         " 0x%02x", vpd->device_identifier_code_set);
1186                 ret = -EINVAL;
1187                 break;
1188         }
1189
1190         if (p_buf)
1191                 strncpy(p_buf, buf, p_buf_len);
1192         else
1193                 pr_debug("%s", buf);
1194
1195         return ret;
1196 }
1197
1198 int
1199 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1200 {
1201         static const char hex_str[] = "0123456789abcdef";
1202         int j = 0, i = 4; /* offset to start of the identifer */
1203
1204         /*
1205          * The VPD Code Set (encoding)
1206          *
1207          * from spc3r23.pdf Section 7.6.3.1 Table 296
1208          */
1209         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1210         switch (vpd->device_identifier_code_set) {
1211         case 0x01: /* Binary */
1212                 vpd->device_identifier[j++] =
1213                                 hex_str[vpd->device_identifier_type];
1214                 while (i < (4 + page_83[3])) {
1215                         vpd->device_identifier[j++] =
1216                                 hex_str[(page_83[i] & 0xf0) >> 4];
1217                         vpd->device_identifier[j++] =
1218                                 hex_str[page_83[i] & 0x0f];
1219                         i++;
1220                 }
1221                 break;
1222         case 0x02: /* ASCII */
1223         case 0x03: /* UTF-8 */
1224                 while (i < (4 + page_83[3]))
1225                         vpd->device_identifier[j++] = page_83[i++];
1226                 break;
1227         default:
1228                 break;
1229         }
1230
1231         return transport_dump_vpd_ident(vpd, NULL, 0);
1232 }
1233 EXPORT_SYMBOL(transport_set_vpd_ident);
1234
1235 static void core_setup_task_attr_emulation(struct se_device *dev)
1236 {
1237         /*
1238          * If this device is from Target_Core_Mod/pSCSI, disable the
1239          * SAM Task Attribute emulation.
1240          *
1241          * This is currently not available in upsream Linux/SCSI Target
1242          * mode code, and is assumed to be disabled while using TCM/pSCSI.
1243          */
1244         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1245                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1246                 return;
1247         }
1248
1249         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1250         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1251                 " device\n", dev->transport->name,
1252                 dev->transport->get_device_rev(dev));
1253 }
1254
1255 static void scsi_dump_inquiry(struct se_device *dev)
1256 {
1257         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1258         char buf[17];
1259         int i, device_type;
1260         /*
1261          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1262          */
1263         for (i = 0; i < 8; i++)
1264                 if (wwn->vendor[i] >= 0x20)
1265                         buf[i] = wwn->vendor[i];
1266                 else
1267                         buf[i] = ' ';
1268         buf[i] = '\0';
1269         pr_debug("  Vendor: %s\n", buf);
1270
1271         for (i = 0; i < 16; i++)
1272                 if (wwn->model[i] >= 0x20)
1273                         buf[i] = wwn->model[i];
1274                 else
1275                         buf[i] = ' ';
1276         buf[i] = '\0';
1277         pr_debug("  Model: %s\n", buf);
1278
1279         for (i = 0; i < 4; i++)
1280                 if (wwn->revision[i] >= 0x20)
1281                         buf[i] = wwn->revision[i];
1282                 else
1283                         buf[i] = ' ';
1284         buf[i] = '\0';
1285         pr_debug("  Revision: %s\n", buf);
1286
1287         device_type = dev->transport->get_device_type(dev);
1288         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1289         pr_debug("                 ANSI SCSI revision: %02x\n",
1290                                 dev->transport->get_device_rev(dev));
1291 }
1292
1293 struct se_device *transport_add_device_to_core_hba(
1294         struct se_hba *hba,
1295         struct se_subsystem_api *transport,
1296         struct se_subsystem_dev *se_dev,
1297         u32 device_flags,
1298         void *transport_dev,
1299         struct se_dev_limits *dev_limits,
1300         const char *inquiry_prod,
1301         const char *inquiry_rev)
1302 {
1303         int force_pt;
1304         struct se_device  *dev;
1305
1306         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1307         if (!dev) {
1308                 pr_err("Unable to allocate memory for se_dev_t\n");
1309                 return NULL;
1310         }
1311
1312         transport_init_queue_obj(&dev->dev_queue_obj);
1313         dev->dev_flags          = device_flags;
1314         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1315         dev->dev_ptr            = transport_dev;
1316         dev->se_hba             = hba;
1317         dev->se_sub_dev         = se_dev;
1318         dev->transport          = transport;
1319         INIT_LIST_HEAD(&dev->dev_list);
1320         INIT_LIST_HEAD(&dev->dev_sep_list);
1321         INIT_LIST_HEAD(&dev->dev_tmr_list);
1322         INIT_LIST_HEAD(&dev->execute_task_list);
1323         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1324         INIT_LIST_HEAD(&dev->state_task_list);
1325         INIT_LIST_HEAD(&dev->qf_cmd_list);
1326         spin_lock_init(&dev->execute_task_lock);
1327         spin_lock_init(&dev->delayed_cmd_lock);
1328         spin_lock_init(&dev->dev_reservation_lock);
1329         spin_lock_init(&dev->dev_status_lock);
1330         spin_lock_init(&dev->se_port_lock);
1331         spin_lock_init(&dev->se_tmr_lock);
1332         spin_lock_init(&dev->qf_cmd_lock);
1333         atomic_set(&dev->dev_ordered_id, 0);
1334
1335         se_dev_set_default_attribs(dev, dev_limits);
1336
1337         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1338         dev->creation_time = get_jiffies_64();
1339         spin_lock_init(&dev->stats_lock);
1340
1341         spin_lock(&hba->device_lock);
1342         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1343         hba->dev_count++;
1344         spin_unlock(&hba->device_lock);
1345         /*
1346          * Setup the SAM Task Attribute emulation for struct se_device
1347          */
1348         core_setup_task_attr_emulation(dev);
1349         /*
1350          * Force PR and ALUA passthrough emulation with internal object use.
1351          */
1352         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1353         /*
1354          * Setup the Reservations infrastructure for struct se_device
1355          */
1356         core_setup_reservations(dev, force_pt);
1357         /*
1358          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1359          */
1360         if (core_setup_alua(dev, force_pt) < 0)
1361                 goto out;
1362
1363         /*
1364          * Startup the struct se_device processing thread
1365          */
1366         dev->process_thread = kthread_run(transport_processing_thread, dev,
1367                                           "LIO_%s", dev->transport->name);
1368         if (IS_ERR(dev->process_thread)) {
1369                 pr_err("Unable to create kthread: LIO_%s\n",
1370                         dev->transport->name);
1371                 goto out;
1372         }
1373         /*
1374          * Setup work_queue for QUEUE_FULL
1375          */
1376         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1377         /*
1378          * Preload the initial INQUIRY const values if we are doing
1379          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1380          * passthrough because this is being provided by the backend LLD.
1381          * This is required so that transport_get_inquiry() copies these
1382          * originals once back into DEV_T10_WWN(dev) for the virtual device
1383          * setup.
1384          */
1385         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1386                 if (!inquiry_prod || !inquiry_rev) {
1387                         pr_err("All non TCM/pSCSI plugins require"
1388                                 " INQUIRY consts\n");
1389                         goto out;
1390                 }
1391
1392                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1393                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1394                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1395         }
1396         scsi_dump_inquiry(dev);
1397
1398         return dev;
1399 out:
1400         kthread_stop(dev->process_thread);
1401
1402         spin_lock(&hba->device_lock);
1403         list_del(&dev->dev_list);
1404         hba->dev_count--;
1405         spin_unlock(&hba->device_lock);
1406
1407         se_release_vpd_for_dev(dev);
1408
1409         kfree(dev);
1410
1411         return NULL;
1412 }
1413 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1414
1415 /*      transport_generic_prepare_cdb():
1416  *
1417  *      Since the Initiator sees iSCSI devices as LUNs,  the SCSI CDB will
1418  *      contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1419  *      The point of this is since we are mapping iSCSI LUNs to
1420  *      SCSI Target IDs having a non-zero LUN in the CDB will throw the
1421  *      devices and HBAs for a loop.
1422  */
1423 static inline void transport_generic_prepare_cdb(
1424         unsigned char *cdb)
1425 {
1426         switch (cdb[0]) {
1427         case READ_10: /* SBC - RDProtect */
1428         case READ_12: /* SBC - RDProtect */
1429         case READ_16: /* SBC - RDProtect */
1430         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1431         case VERIFY: /* SBC - VRProtect */
1432         case VERIFY_16: /* SBC - VRProtect */
1433         case WRITE_VERIFY: /* SBC - VRProtect */
1434         case WRITE_VERIFY_12: /* SBC - VRProtect */
1435                 break;
1436         default:
1437                 cdb[1] &= 0x1f; /* clear logical unit number */
1438                 break;
1439         }
1440 }
1441
1442 static struct se_task *
1443 transport_generic_get_task(struct se_cmd *cmd,
1444                 enum dma_data_direction data_direction)
1445 {
1446         struct se_task *task;
1447         struct se_device *dev = cmd->se_dev;
1448
1449         task = dev->transport->alloc_task(cmd->t_task_cdb);
1450         if (!task) {
1451                 pr_err("Unable to allocate struct se_task\n");
1452                 return NULL;
1453         }
1454
1455         INIT_LIST_HEAD(&task->t_list);
1456         INIT_LIST_HEAD(&task->t_execute_list);
1457         INIT_LIST_HEAD(&task->t_state_list);
1458         init_completion(&task->task_stop_comp);
1459         task->task_se_cmd = cmd;
1460         task->task_data_direction = data_direction;
1461
1462         return task;
1463 }
1464
1465 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1466
1467 /*
1468  * Used by fabric modules containing a local struct se_cmd within their
1469  * fabric dependent per I/O descriptor.
1470  */
1471 void transport_init_se_cmd(
1472         struct se_cmd *cmd,
1473         struct target_core_fabric_ops *tfo,
1474         struct se_session *se_sess,
1475         u32 data_length,
1476         int data_direction,
1477         int task_attr,
1478         unsigned char *sense_buffer)
1479 {
1480         INIT_LIST_HEAD(&cmd->se_lun_node);
1481         INIT_LIST_HEAD(&cmd->se_delayed_node);
1482         INIT_LIST_HEAD(&cmd->se_qf_node);
1483         INIT_LIST_HEAD(&cmd->se_queue_node);
1484         INIT_LIST_HEAD(&cmd->se_cmd_list);
1485         INIT_LIST_HEAD(&cmd->t_task_list);
1486         init_completion(&cmd->transport_lun_fe_stop_comp);
1487         init_completion(&cmd->transport_lun_stop_comp);
1488         init_completion(&cmd->t_transport_stop_comp);
1489         init_completion(&cmd->cmd_wait_comp);
1490         spin_lock_init(&cmd->t_state_lock);
1491         atomic_set(&cmd->transport_dev_active, 1);
1492
1493         cmd->se_tfo = tfo;
1494         cmd->se_sess = se_sess;
1495         cmd->data_length = data_length;
1496         cmd->data_direction = data_direction;
1497         cmd->sam_task_attr = task_attr;
1498         cmd->sense_buffer = sense_buffer;
1499 }
1500 EXPORT_SYMBOL(transport_init_se_cmd);
1501
1502 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1503 {
1504         /*
1505          * Check if SAM Task Attribute emulation is enabled for this
1506          * struct se_device storage object
1507          */
1508         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1509                 return 0;
1510
1511         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1512                 pr_debug("SAM Task Attribute ACA"
1513                         " emulation is not supported\n");
1514                 return -EINVAL;
1515         }
1516         /*
1517          * Used to determine when ORDERED commands should go from
1518          * Dormant to Active status.
1519          */
1520         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1521         smp_mb__after_atomic_inc();
1522         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1523                         cmd->se_ordered_id, cmd->sam_task_attr,
1524                         cmd->se_dev->transport->name);
1525         return 0;
1526 }
1527
1528 /*      transport_generic_allocate_tasks():
1529  *
1530  *      Called from fabric RX Thread.
1531  */
1532 int transport_generic_allocate_tasks(
1533         struct se_cmd *cmd,
1534         unsigned char *cdb)
1535 {
1536         int ret;
1537
1538         transport_generic_prepare_cdb(cdb);
1539         /*
1540          * Ensure that the received CDB is less than the max (252 + 8) bytes
1541          * for VARIABLE_LENGTH_CMD
1542          */
1543         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1544                 pr_err("Received SCSI CDB with command_size: %d that"
1545                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1546                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1547                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1548                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1549                 return -EINVAL;
1550         }
1551         /*
1552          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1553          * allocate the additional extended CDB buffer now..  Otherwise
1554          * setup the pointer from __t_task_cdb to t_task_cdb.
1555          */
1556         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1557                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1558                                                 GFP_KERNEL);
1559                 if (!cmd->t_task_cdb) {
1560                         pr_err("Unable to allocate cmd->t_task_cdb"
1561                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1562                                 scsi_command_size(cdb),
1563                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1564                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1565                         cmd->scsi_sense_reason =
1566                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1567                         return -ENOMEM;
1568                 }
1569         } else
1570                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1571         /*
1572          * Copy the original CDB into cmd->
1573          */
1574         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1575         /*
1576          * Setup the received CDB based on SCSI defined opcodes and
1577          * perform unit attention, persistent reservations and ALUA
1578          * checks for virtual device backends.  The cmd->t_task_cdb
1579          * pointer is expected to be setup before we reach this point.
1580          */
1581         ret = transport_generic_cmd_sequencer(cmd, cdb);
1582         if (ret < 0)
1583                 return ret;
1584         /*
1585          * Check for SAM Task Attribute Emulation
1586          */
1587         if (transport_check_alloc_task_attr(cmd) < 0) {
1588                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1589                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1590                 return -EINVAL;
1591         }
1592         spin_lock(&cmd->se_lun->lun_sep_lock);
1593         if (cmd->se_lun->lun_sep)
1594                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1595         spin_unlock(&cmd->se_lun->lun_sep_lock);
1596         return 0;
1597 }
1598 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1599
1600 /*
1601  * Used by fabric module frontends to queue tasks directly.
1602  * Many only be used from process context only
1603  */
1604 int transport_handle_cdb_direct(
1605         struct se_cmd *cmd)
1606 {
1607         int ret;
1608
1609         if (!cmd->se_lun) {
1610                 dump_stack();
1611                 pr_err("cmd->se_lun is NULL\n");
1612                 return -EINVAL;
1613         }
1614         if (in_interrupt()) {
1615                 dump_stack();
1616                 pr_err("transport_generic_handle_cdb cannot be called"
1617                                 " from interrupt context\n");
1618                 return -EINVAL;
1619         }
1620         /*
1621          * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1622          * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1623          * in existing usage to ensure that outstanding descriptors are handled
1624          * correctly during shutdown via transport_wait_for_tasks()
1625          *
1626          * Also, we don't take cmd->t_state_lock here as we only expect
1627          * this to be called for initial descriptor submission.
1628          */
1629         cmd->t_state = TRANSPORT_NEW_CMD;
1630         atomic_set(&cmd->t_transport_active, 1);
1631         /*
1632          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1633          * so follow TRANSPORT_NEW_CMD processing thread context usage
1634          * and call transport_generic_request_failure() if necessary..
1635          */
1636         ret = transport_generic_new_cmd(cmd);
1637         if (ret < 0)
1638                 transport_generic_request_failure(cmd);
1639
1640         return 0;
1641 }
1642 EXPORT_SYMBOL(transport_handle_cdb_direct);
1643
1644 /**
1645  * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1646  *
1647  * @se_cmd: command descriptor to submit
1648  * @se_sess: associated se_sess for endpoint
1649  * @cdb: pointer to SCSI CDB
1650  * @sense: pointer to SCSI sense buffer
1651  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1652  * @data_length: fabric expected data transfer length
1653  * @task_addr: SAM task attribute
1654  * @data_dir: DMA data direction
1655  * @flags: flags for command submission from target_sc_flags_tables
1656  *
1657  * This may only be called from process context, and also currently
1658  * assumes internal allocation of fabric payload buffer by target-core.
1659  **/
1660 void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1661                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1662                 u32 data_length, int task_attr, int data_dir, int flags)
1663 {
1664         struct se_portal_group *se_tpg;
1665         int rc;
1666
1667         se_tpg = se_sess->se_tpg;
1668         BUG_ON(!se_tpg);
1669         BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1670         BUG_ON(in_interrupt());
1671         /*
1672          * Initialize se_cmd for target operation.  From this point
1673          * exceptions are handled by sending exception status via
1674          * target_core_fabric_ops->queue_status() callback
1675          */
1676         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1677                                 data_length, data_dir, task_attr, sense);
1678         /*
1679          * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1680          * se_sess->sess_cmd_list.  A second kref_get here is necessary
1681          * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1682          * kref_put() to happen during fabric packet acknowledgement.
1683          */
1684         target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1685         /*
1686          * Signal bidirectional data payloads to target-core
1687          */
1688         if (flags & TARGET_SCF_BIDI_OP)
1689                 se_cmd->se_cmd_flags |= SCF_BIDI;
1690         /*
1691          * Locate se_lun pointer and attach it to struct se_cmd
1692          */
1693         if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1694                 transport_send_check_condition_and_sense(se_cmd,
1695                                 se_cmd->scsi_sense_reason, 0);
1696                 target_put_sess_cmd(se_sess, se_cmd);
1697                 return;
1698         }
1699         /*
1700          * Sanitize CDBs via transport_generic_cmd_sequencer() and
1701          * allocate the necessary tasks to complete the received CDB+data
1702          */
1703         rc = transport_generic_allocate_tasks(se_cmd, cdb);
1704         if (rc != 0) {
1705                 transport_generic_request_failure(se_cmd);
1706                 return;
1707         }
1708         /*
1709          * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1710          * for immediate execution of READs, otherwise wait for
1711          * transport_generic_handle_data() to be called for WRITEs
1712          * when fabric has filled the incoming buffer.
1713          */
1714         transport_handle_cdb_direct(se_cmd);
1715         return;
1716 }
1717 EXPORT_SYMBOL(target_submit_cmd);
1718
1719 /*
1720  * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1721  * to  queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1722  * complete setup in TCM process context w/ TFO->new_cmd_map().
1723  */
1724 int transport_generic_handle_cdb_map(
1725         struct se_cmd *cmd)
1726 {
1727         if (!cmd->se_lun) {
1728                 dump_stack();
1729                 pr_err("cmd->se_lun is NULL\n");
1730                 return -EINVAL;
1731         }
1732
1733         transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1734         return 0;
1735 }
1736 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1737
1738 /*      transport_generic_handle_data():
1739  *
1740  *
1741  */
1742 int transport_generic_handle_data(
1743         struct se_cmd *cmd)
1744 {
1745         /*
1746          * For the software fabric case, then we assume the nexus is being
1747          * failed/shutdown when signals are pending from the kthread context
1748          * caller, so we return a failure.  For the HW target mode case running
1749          * in interrupt code, the signal_pending() check is skipped.
1750          */
1751         if (!in_interrupt() && signal_pending(current))
1752                 return -EPERM;
1753         /*
1754          * If the received CDB has aleady been ABORTED by the generic
1755          * target engine, we now call transport_check_aborted_status()
1756          * to queue any delated TASK_ABORTED status for the received CDB to the
1757          * fabric module as we are expecting no further incoming DATA OUT
1758          * sequences at this point.
1759          */
1760         if (transport_check_aborted_status(cmd, 1) != 0)
1761                 return 0;
1762
1763         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1764         return 0;
1765 }
1766 EXPORT_SYMBOL(transport_generic_handle_data);
1767
1768 /*      transport_generic_handle_tmr():
1769  *
1770  *
1771  */
1772 int transport_generic_handle_tmr(
1773         struct se_cmd *cmd)
1774 {
1775         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1776         return 0;
1777 }
1778 EXPORT_SYMBOL(transport_generic_handle_tmr);
1779
1780 /*
1781  * If the task is active, request it to be stopped and sleep until it
1782  * has completed.
1783  */
1784 bool target_stop_task(struct se_task *task, unsigned long *flags)
1785 {
1786         struct se_cmd *cmd = task->task_se_cmd;
1787         bool was_active = false;
1788
1789         if (task->task_flags & TF_ACTIVE) {
1790                 task->task_flags |= TF_REQUEST_STOP;
1791                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1792
1793                 pr_debug("Task %p waiting to complete\n", task);
1794                 wait_for_completion(&task->task_stop_comp);
1795                 pr_debug("Task %p stopped successfully\n", task);
1796
1797                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1798                 atomic_dec(&cmd->t_task_cdbs_left);
1799                 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1800                 was_active = true;
1801         }
1802
1803         return was_active;
1804 }
1805
1806 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1807 {
1808         struct se_task *task, *task_tmp;
1809         unsigned long flags;
1810         int ret = 0;
1811
1812         pr_debug("ITT[0x%08x] - Stopping tasks\n",
1813                 cmd->se_tfo->get_task_tag(cmd));
1814
1815         /*
1816          * No tasks remain in the execution queue
1817          */
1818         spin_lock_irqsave(&cmd->t_state_lock, flags);
1819         list_for_each_entry_safe(task, task_tmp,
1820                                 &cmd->t_task_list, t_list) {
1821                 pr_debug("Processing task %p\n", task);
1822                 /*
1823                  * If the struct se_task has not been sent and is not active,
1824                  * remove the struct se_task from the execution queue.
1825                  */
1826                 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
1827                         spin_unlock_irqrestore(&cmd->t_state_lock,
1828                                         flags);
1829                         transport_remove_task_from_execute_queue(task,
1830                                         cmd->se_dev);
1831
1832                         pr_debug("Task %p removed from execute queue\n", task);
1833                         spin_lock_irqsave(&cmd->t_state_lock, flags);
1834                         continue;
1835                 }
1836
1837                 if (!target_stop_task(task, &flags)) {
1838                         pr_debug("Task %p - did nothing\n", task);
1839                         ret++;
1840                 }
1841         }
1842         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1843
1844         return ret;
1845 }
1846
1847 /*
1848  * Handle SAM-esque emulation for generic transport request failures.
1849  */
1850 static void transport_generic_request_failure(struct se_cmd *cmd)
1851 {
1852         int ret = 0;
1853
1854         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1855                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1856                 cmd->t_task_cdb[0]);
1857         pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1858                 cmd->se_tfo->get_cmd_state(cmd),
1859                 cmd->t_state, cmd->scsi_sense_reason);
1860         pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1861                 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1862                 " t_transport_active: %d t_transport_stop: %d"
1863                 " t_transport_sent: %d\n", cmd->t_task_list_num,
1864                 atomic_read(&cmd->t_task_cdbs_left),
1865                 atomic_read(&cmd->t_task_cdbs_sent),
1866                 atomic_read(&cmd->t_task_cdbs_ex_left),
1867                 atomic_read(&cmd->t_transport_active),
1868                 atomic_read(&cmd->t_transport_stop),
1869                 atomic_read(&cmd->t_transport_sent));
1870
1871         /*
1872          * For SAM Task Attribute emulation for failed struct se_cmd
1873          */
1874         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1875                 transport_complete_task_attr(cmd);
1876
1877         switch (cmd->scsi_sense_reason) {
1878         case TCM_NON_EXISTENT_LUN:
1879         case TCM_UNSUPPORTED_SCSI_OPCODE:
1880         case TCM_INVALID_CDB_FIELD:
1881         case TCM_INVALID_PARAMETER_LIST:
1882         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1883         case TCM_UNKNOWN_MODE_PAGE:
1884         case TCM_WRITE_PROTECTED:
1885         case TCM_CHECK_CONDITION_ABORT_CMD:
1886         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1887         case TCM_CHECK_CONDITION_NOT_READY:
1888                 break;
1889         case TCM_RESERVATION_CONFLICT:
1890                 /*
1891                  * No SENSE Data payload for this case, set SCSI Status
1892                  * and queue the response to $FABRIC_MOD.
1893                  *
1894                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1895                  */
1896                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1897                 /*
1898                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1899                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1900                  * CONFLICT STATUS.
1901                  *
1902                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1903                  */
1904                 if (cmd->se_sess &&
1905                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1906                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1907                                 cmd->orig_fe_lun, 0x2C,
1908                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1909
1910                 ret = cmd->se_tfo->queue_status(cmd);
1911                 if (ret == -EAGAIN || ret == -ENOMEM)
1912                         goto queue_full;
1913                 goto check_stop;
1914         default:
1915                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1916                         cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1917                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1918                 break;
1919         }
1920         /*
1921          * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1922          * make the call to transport_send_check_condition_and_sense()
1923          * directly.  Otherwise expect the fabric to make the call to
1924          * transport_send_check_condition_and_sense() after handling
1925          * possible unsoliticied write data payloads.
1926          */
1927         ret = transport_send_check_condition_and_sense(cmd,
1928                         cmd->scsi_sense_reason, 0);
1929         if (ret == -EAGAIN || ret == -ENOMEM)
1930                 goto queue_full;
1931
1932 check_stop:
1933         transport_lun_remove_cmd(cmd);
1934         if (!transport_cmd_check_stop_to_fabric(cmd))
1935                 ;
1936         return;
1937
1938 queue_full:
1939         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1940         transport_handle_queue_full(cmd, cmd->se_dev);
1941 }
1942
1943 static inline u32 transport_lba_21(unsigned char *cdb)
1944 {
1945         return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1946 }
1947
1948 static inline u32 transport_lba_32(unsigned char *cdb)
1949 {
1950         return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1951 }
1952
1953 static inline unsigned long long transport_lba_64(unsigned char *cdb)
1954 {
1955         unsigned int __v1, __v2;
1956
1957         __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1958         __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1959
1960         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1961 }
1962
1963 /*
1964  * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1965  */
1966 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1967 {
1968         unsigned int __v1, __v2;
1969
1970         __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1971         __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1972
1973         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1974 }
1975
1976 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1977 {
1978         unsigned long flags;
1979
1980         spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1981         se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1982         spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1983 }
1984
1985 /*
1986  * Called from Fabric Module context from transport_execute_tasks()
1987  *
1988  * The return of this function determins if the tasks from struct se_cmd
1989  * get added to the execution queue in transport_execute_tasks(),
1990  * or are added to the delayed or ordered lists here.
1991  */
1992 static inline int transport_execute_task_attr(struct se_cmd *cmd)
1993 {
1994         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1995                 return 1;
1996         /*
1997          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1998          * to allow the passed struct se_cmd list of tasks to the front of the list.
1999          */
2000          if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2001                 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2002                         " 0x%02x, se_ordered_id: %u\n",
2003                         cmd->t_task_cdb[0],
2004                         cmd->se_ordered_id);
2005                 return 1;
2006         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2007                 atomic_inc(&cmd->se_dev->dev_ordered_sync);
2008                 smp_mb__after_atomic_inc();
2009
2010                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2011                                 " list, se_ordered_id: %u\n",
2012                                 cmd->t_task_cdb[0],
2013                                 cmd->se_ordered_id);
2014                 /*
2015                  * Add ORDERED command to tail of execution queue if
2016                  * no other older commands exist that need to be
2017                  * completed first.
2018                  */
2019                 if (!atomic_read(&cmd->se_dev->simple_cmds))
2020                         return 1;
2021         } else {
2022                 /*
2023                  * For SIMPLE and UNTAGGED Task Attribute commands
2024                  */
2025                 atomic_inc(&cmd->se_dev->simple_cmds);
2026                 smp_mb__after_atomic_inc();
2027         }
2028         /*
2029          * Otherwise if one or more outstanding ORDERED task attribute exist,
2030          * add the dormant task(s) built for the passed struct se_cmd to the
2031          * execution queue and become in Active state for this struct se_device.
2032          */
2033         if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
2034                 /*
2035                  * Otherwise, add cmd w/ tasks to delayed cmd queue that
2036                  * will be drained upon completion of HEAD_OF_QUEUE task.
2037                  */
2038                 spin_lock(&cmd->se_dev->delayed_cmd_lock);
2039                 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2040                 list_add_tail(&cmd->se_delayed_node,
2041                                 &cmd->se_dev->delayed_cmd_list);
2042                 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
2043
2044                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2045                         " delayed CMD list, se_ordered_id: %u\n",
2046                         cmd->t_task_cdb[0], cmd->sam_task_attr,
2047                         cmd->se_ordered_id);
2048                 /*
2049                  * Return zero to let transport_execute_tasks() know
2050                  * not to add the delayed tasks to the execution list.
2051                  */
2052                 return 0;
2053         }
2054         /*
2055          * Otherwise, no ORDERED task attributes exist..
2056          */
2057         return 1;
2058 }
2059
2060 /*
2061  * Called from fabric module context in transport_generic_new_cmd() and
2062  * transport_generic_process_write()
2063  */
2064 static int transport_execute_tasks(struct se_cmd *cmd)
2065 {
2066         int add_tasks;
2067         struct se_device *se_dev = cmd->se_dev;
2068         /*
2069          * Call transport_cmd_check_stop() to see if a fabric exception
2070          * has occurred that prevents execution.
2071          */
2072         if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2073                 /*
2074                  * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2075                  * attribute for the tasks of the received struct se_cmd CDB
2076                  */
2077                 add_tasks = transport_execute_task_attr(cmd);
2078                 if (!add_tasks)
2079                         goto execute_tasks;
2080                 /*
2081                  * __transport_execute_tasks() -> __transport_add_tasks_from_cmd()
2082                  * adds associated se_tasks while holding dev->execute_task_lock
2083                  * before I/O dispath to avoid a double spinlock access.
2084                  */
2085                 __transport_execute_tasks(se_dev, cmd);
2086                 return 0;
2087         }
2088
2089 execute_tasks:
2090         __transport_execute_tasks(se_dev, NULL);
2091         return 0;
2092 }
2093
2094 /*
2095  * Called to check struct se_device tcq depth window, and once open pull struct se_task
2096  * from struct se_device->execute_task_list and
2097  *
2098  * Called from transport_processing_thread()
2099  */
2100 static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
2101 {
2102         int error;
2103         struct se_cmd *cmd = NULL;
2104         struct se_task *task = NULL;
2105         unsigned long flags;
2106
2107 check_depth:
2108         spin_lock_irq(&dev->execute_task_lock);
2109         if (new_cmd != NULL)
2110                 __transport_add_tasks_from_cmd(new_cmd);
2111
2112         if (list_empty(&dev->execute_task_list)) {
2113                 spin_unlock_irq(&dev->execute_task_lock);
2114                 return 0;
2115         }
2116         task = list_first_entry(&dev->execute_task_list,
2117                                 struct se_task, t_execute_list);
2118         __transport_remove_task_from_execute_queue(task, dev);
2119         spin_unlock_irq(&dev->execute_task_lock);
2120
2121         cmd = task->task_se_cmd;
2122         spin_lock_irqsave(&cmd->t_state_lock, flags);
2123         task->task_flags |= (TF_ACTIVE | TF_SENT);
2124         atomic_inc(&cmd->t_task_cdbs_sent);
2125
2126         if (atomic_read(&cmd->t_task_cdbs_sent) ==
2127             cmd->t_task_list_num)
2128                 atomic_set(&cmd->t_transport_sent, 1);
2129
2130         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2131
2132         if (cmd->execute_task)
2133                 error = cmd->execute_task(task);
2134         else
2135                 error = dev->transport->do_task(task);
2136         if (error != 0) {
2137                 spin_lock_irqsave(&cmd->t_state_lock, flags);
2138                 task->task_flags &= ~TF_ACTIVE;
2139                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2140                 atomic_set(&cmd->t_transport_sent, 0);
2141                 transport_stop_tasks_for_cmd(cmd);
2142                 transport_generic_request_failure(cmd);
2143         }
2144
2145         new_cmd = NULL;
2146         goto check_depth;
2147
2148         return 0;
2149 }
2150
2151 static inline u32 transport_get_sectors_6(
2152         unsigned char *cdb,
2153         struct se_cmd *cmd,
2154         int *ret)
2155 {
2156         struct se_device *dev = cmd->se_dev;
2157
2158         /*
2159          * Assume TYPE_DISK for non struct se_device objects.
2160          * Use 8-bit sector value.
2161          */
2162         if (!dev)
2163                 goto type_disk;
2164
2165         /*
2166          * Use 24-bit allocation length for TYPE_TAPE.
2167          */
2168         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2169                 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2170
2171         /*
2172          * Everything else assume TYPE_DISK Sector CDB location.
2173          * Use 8-bit sector value.  SBC-3 says:
2174          *
2175          *   A TRANSFER LENGTH field set to zero specifies that 256
2176          *   logical blocks shall be written.  Any other value
2177          *   specifies the number of logical blocks that shall be
2178          *   written.
2179          */
2180 type_disk:
2181         return cdb[4] ? : 256;
2182 }
2183
2184 static inline u32 transport_get_sectors_10(
2185         unsigned char *cdb,
2186         struct se_cmd *cmd,
2187         int *ret)
2188 {
2189         struct se_device *dev = cmd->se_dev;
2190
2191         /*
2192          * Assume TYPE_DISK for non struct se_device objects.
2193          * Use 16-bit sector value.
2194          */
2195         if (!dev)
2196                 goto type_disk;
2197
2198         /*
2199          * XXX_10 is not defined in SSC, throw an exception
2200          */
2201         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2202                 *ret = -EINVAL;
2203                 return 0;
2204         }
2205
2206         /*
2207          * Everything else assume TYPE_DISK Sector CDB location.
2208          * Use 16-bit sector value.
2209          */
2210 type_disk:
2211         return (u32)(cdb[7] << 8) + cdb[8];
2212 }
2213
2214 static inline u32 transport_get_sectors_12(
2215         unsigned char *cdb,
2216         struct se_cmd *cmd,
2217         int *ret)
2218 {
2219         struct se_device *dev = cmd->se_dev;
2220
2221         /*
2222          * Assume TYPE_DISK for non struct se_device objects.
2223          * Use 32-bit sector value.
2224          */
2225         if (!dev)
2226                 goto type_disk;
2227
2228         /*
2229          * XXX_12 is not defined in SSC, throw an exception
2230          */
2231         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2232                 *ret = -EINVAL;
2233                 return 0;
2234         }
2235
2236         /*
2237          * Everything else assume TYPE_DISK Sector CDB location.
2238          * Use 32-bit sector value.
2239          */
2240 type_disk:
2241         return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2242 }
2243
2244 static inline u32 transport_get_sectors_16(
2245         unsigned char *cdb,
2246         struct se_cmd *cmd,
2247         int *ret)
2248 {
2249         struct se_device *dev = cmd->se_dev;
2250
2251         /*
2252          * Assume TYPE_DISK for non struct se_device objects.
2253          * Use 32-bit sector value.
2254          */
2255         if (!dev)
2256                 goto type_disk;
2257
2258         /*
2259          * Use 24-bit allocation length for TYPE_TAPE.
2260          */
2261         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2262                 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2263
2264 type_disk:
2265         return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2266                     (cdb[12] << 8) + cdb[13];
2267 }
2268
2269 /*
2270  * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2271  */
2272 static inline u32 transport_get_sectors_32(
2273         unsigned char *cdb,
2274         struct se_cmd *cmd,
2275         int *ret)
2276 {
2277         /*
2278          * Assume TYPE_DISK for non struct se_device objects.
2279          * Use 32-bit sector value.
2280          */
2281         return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2282                     (cdb[30] << 8) + cdb[31];
2283
2284 }
2285
2286 static inline u32 transport_get_size(
2287         u32 sectors,
2288         unsigned char *cdb,
2289         struct se_cmd *cmd)
2290 {
2291         struct se_device *dev = cmd->se_dev;
2292
2293         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2294                 if (cdb[1] & 1) { /* sectors */
2295                         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2296                 } else /* bytes */
2297                         return sectors;
2298         }
2299 #if 0
2300         pr_debug("Returning block_size: %u, sectors: %u == %u for"
2301                         " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2302                         dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2303                         dev->transport->name);
2304 #endif
2305         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2306 }
2307
2308 static void transport_xor_callback(struct se_cmd *cmd)
2309 {
2310         unsigned char *buf, *addr;
2311         struct scatterlist *sg;
2312         unsigned int offset;
2313         int i;
2314         int count;
2315         /*
2316          * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2317          *
2318          * 1) read the specified logical block(s);
2319          * 2) transfer logical blocks from the data-out buffer;
2320          * 3) XOR the logical blocks transferred from the data-out buffer with
2321          *    the logical blocks read, storing the resulting XOR data in a buffer;
2322          * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2323          *    blocks transferred from the data-out buffer; and
2324          * 5) transfer the resulting XOR data to the data-in buffer.
2325          */
2326         buf = kmalloc(cmd->data_length, GFP_KERNEL);
2327         if (!buf) {
2328                 pr_err("Unable to allocate xor_callback buf\n");
2329                 return;
2330         }
2331         /*
2332          * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2333          * into the locally allocated *buf
2334          */
2335         sg_copy_to_buffer(cmd->t_data_sg,
2336                           cmd->t_data_nents,
2337                           buf,
2338                           cmd->data_length);
2339
2340         /*
2341          * Now perform the XOR against the BIDI read memory located at
2342          * cmd->t_mem_bidi_list
2343          */
2344
2345         offset = 0;
2346         for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2347                 addr = kmap_atomic(sg_page(sg), KM_USER0);
2348                 if (!addr)
2349                         goto out;
2350
2351                 for (i = 0; i < sg->length; i++)
2352                         *(addr + sg->offset + i) ^= *(buf + offset + i);
2353
2354                 offset += sg->length;
2355                 kunmap_atomic(addr, KM_USER0);
2356         }
2357
2358 out:
2359         kfree(buf);
2360 }
2361
2362 /*
2363  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2364  */
2365 static int transport_get_sense_data(struct se_cmd *cmd)
2366 {
2367         unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2368         struct se_device *dev = cmd->se_dev;
2369         struct se_task *task = NULL, *task_tmp;
2370         unsigned long flags;
2371         u32 offset = 0;
2372
2373         WARN_ON(!cmd->se_lun);
2374
2375         if (!dev)
2376                 return 0;
2377
2378         spin_lock_irqsave(&cmd->t_state_lock, flags);
2379         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2380                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2381                 return 0;
2382         }
2383
2384         list_for_each_entry_safe(task, task_tmp,
2385                                 &cmd->t_task_list, t_list) {
2386                 if (!(task->task_flags & TF_HAS_SENSE))
2387                         continue;
2388
2389                 if (!dev->transport->get_sense_buffer) {
2390                         pr_err("dev->transport->get_sense_buffer"
2391                                         " is NULL\n");
2392                         continue;
2393                 }
2394
2395                 sense_buffer = dev->transport->get_sense_buffer(task);
2396                 if (!sense_buffer) {
2397                         pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2398                                 " sense buffer for task with sense\n",
2399                                 cmd->se_tfo->get_task_tag(cmd), task);
2400                         continue;
2401                 }
2402                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2403
2404                 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2405                                 TRANSPORT_SENSE_BUFFER);
2406
2407                 memcpy(&buffer[offset], sense_buffer,
2408                                 TRANSPORT_SENSE_BUFFER);
2409                 cmd->scsi_status = task->task_scsi_status;
2410                 /* Automatically padded */
2411                 cmd->scsi_sense_length =
2412                                 (TRANSPORT_SENSE_BUFFER + offset);
2413
2414                 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2415                                 " and sense\n",
2416                         dev->se_hba->hba_id, dev->transport->name,
2417                                 cmd->scsi_status);
2418                 return 0;
2419         }
2420         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2421
2422         return -1;
2423 }
2424
2425 static inline long long transport_dev_end_lba(struct se_device *dev)
2426 {
2427         return dev->transport->get_blocks(dev) + 1;
2428 }
2429
2430 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2431 {
2432         struct se_device *dev = cmd->se_dev;
2433         u32 sectors;
2434
2435         if (dev->transport->get_device_type(dev) != TYPE_DISK)
2436                 return 0;
2437
2438         sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2439
2440         if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2441                 pr_err("LBA: %llu Sectors: %u exceeds"
2442                         " transport_dev_end_lba(): %llu\n",
2443                         cmd->t_task_lba, sectors,
2444                         transport_dev_end_lba(dev));
2445                 return -EINVAL;
2446         }
2447
2448         return 0;
2449 }
2450
2451 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2452 {
2453         /*
2454          * Determine if the received WRITE_SAME is used to for direct
2455          * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2456          * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2457          * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2458          */
2459         int passthrough = (dev->transport->transport_type ==
2460                                 TRANSPORT_PLUGIN_PHBA_PDEV);
2461
2462         if (!passthrough) {
2463                 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2464                         pr_err("WRITE_SAME PBDATA and LBDATA"
2465                                 " bits not supported for Block Discard"
2466                                 " Emulation\n");
2467                         return -ENOSYS;
2468                 }
2469                 /*
2470                  * Currently for the emulated case we only accept
2471                  * tpws with the UNMAP=1 bit set.
2472                  */
2473                 if (!(flags[0] & 0x08)) {
2474                         pr_err("WRITE_SAME w/o UNMAP bit not"
2475                                 " supported for Block Discard Emulation\n");
2476                         return -ENOSYS;
2477                 }
2478         }
2479
2480         return 0;
2481 }
2482
2483 /*      transport_generic_cmd_sequencer():
2484  *
2485  *      Generic Command Sequencer that should work for most DAS transport
2486  *      drivers.
2487  *
2488  *      Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2489  *      RX Thread.
2490  *
2491  *      FIXME: Need to support other SCSI OPCODES where as well.
2492  */
2493 static int transport_generic_cmd_sequencer(
2494         struct se_cmd *cmd,
2495         unsigned char *cdb)
2496 {
2497         struct se_device *dev = cmd->se_dev;
2498         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2499         int ret = 0, sector_ret = 0, passthrough;
2500         u32 sectors = 0, size = 0, pr_reg_type = 0;
2501         u16 service_action;
2502         u8 alua_ascq = 0;
2503         /*
2504          * Check for an existing UNIT ATTENTION condition
2505          */
2506         if (core_scsi3_ua_check(cmd, cdb) < 0) {
2507                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2508                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2509                 return -EINVAL;
2510         }
2511         /*
2512          * Check status of Asymmetric Logical Unit Assignment port
2513          */
2514         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2515         if (ret != 0) {
2516                 /*
2517                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2518                  * The ALUA additional sense code qualifier (ASCQ) is determined
2519                  * by the ALUA primary or secondary access state..
2520                  */
2521                 if (ret > 0) {
2522 #if 0
2523                         pr_debug("[%s]: ALUA TG Port not available,"
2524                                 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2525                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
2526 #endif
2527                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
2528                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2529                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2530                         return -EINVAL;
2531                 }
2532                 goto out_invalid_cdb_field;
2533         }
2534         /*
2535          * Check status for SPC-3 Persistent Reservations
2536          */
2537         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2538                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2539                                         cmd, cdb, pr_reg_type) != 0) {
2540                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2541                         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2542                         cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2543                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2544                         return -EBUSY;
2545                 }
2546                 /*
2547                  * This means the CDB is allowed for the SCSI Initiator port
2548                  * when said port is *NOT* holding the legacy SPC-2 or
2549                  * SPC-3 Persistent Reservation.
2550                  */
2551         }
2552
2553         /*
2554          * If we operate in passthrough mode we skip most CDB emulation and
2555          * instead hand the commands down to the physical SCSI device.
2556          */
2557         passthrough =
2558                 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2559
2560         switch (cdb[0]) {
2561         case READ_6:
2562                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2563                 if (sector_ret)
2564                         goto out_unsupported_cdb;
2565                 size = transport_get_size(sectors, cdb, cmd);
2566                 cmd->t_task_lba = transport_lba_21(cdb);
2567                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2568                 break;
2569         case READ_10:
2570                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2571                 if (sector_ret)
2572                         goto out_unsupported_cdb;
2573                 size = transport_get_size(sectors, cdb, cmd);
2574                 cmd->t_task_lba = transport_lba_32(cdb);
2575                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2576                 break;
2577         case READ_12:
2578                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2579                 if (sector_ret)
2580                         goto out_unsupported_cdb;
2581                 size = transport_get_size(sectors, cdb, cmd);
2582                 cmd->t_task_lba = transport_lba_32(cdb);
2583                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2584                 break;
2585         case READ_16:
2586                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2587                 if (sector_ret)
2588                         goto out_unsupported_cdb;
2589                 size = transport_get_size(sectors, cdb, cmd);
2590                 cmd->t_task_lba = transport_lba_64(cdb);
2591                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2592                 break;
2593         case WRITE_6:
2594                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2595                 if (sector_ret)
2596                         goto out_unsupported_cdb;
2597                 size = transport_get_size(sectors, cdb, cmd);
2598                 cmd->t_task_lba = transport_lba_21(cdb);
2599                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2600                 break;
2601         case WRITE_10:
2602                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2603                 if (sector_ret)
2604                         goto out_unsupported_cdb;
2605                 size = transport_get_size(sectors, cdb, cmd);
2606                 cmd->t_task_lba = transport_lba_32(cdb);
2607                 if (cdb[1] & 0x8)
2608                         cmd->se_cmd_flags |= SCF_FUA;
2609                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2610                 break;
2611         case WRITE_12:
2612                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2613                 if (sector_ret)
2614                         goto out_unsupported_cdb;
2615                 size = transport_get_size(sectors, cdb, cmd);
2616                 cmd->t_task_lba = transport_lba_32(cdb);
2617                 if (cdb[1] & 0x8)
2618                         cmd->se_cmd_flags |= SCF_FUA;
2619                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2620                 break;
2621         case WRITE_16:
2622                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2623                 if (sector_ret)
2624                         goto out_unsupported_cdb;
2625                 size = transport_get_size(sectors, cdb, cmd);
2626                 cmd->t_task_lba = transport_lba_64(cdb);
2627                 if (cdb[1] & 0x8)
2628                         cmd->se_cmd_flags |= SCF_FUA;
2629                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2630                 break;
2631         case XDWRITEREAD_10:
2632                 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2633                     !(cmd->se_cmd_flags & SCF_BIDI))
2634                         goto out_invalid_cdb_field;
2635                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2636                 if (sector_ret)
2637                         goto out_unsupported_cdb;
2638                 size = transport_get_size(sectors, cdb, cmd);
2639                 cmd->t_task_lba = transport_lba_32(cdb);
2640                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2641
2642                 /*
2643                  * Do now allow BIDI commands for passthrough mode.
2644                  */
2645                 if (passthrough)
2646                         goto out_unsupported_cdb;
2647
2648                 /*
2649                  * Setup BIDI XOR callback to be run after I/O completion.
2650                  */
2651                 cmd->transport_complete_callback = &transport_xor_callback;
2652                 if (cdb[1] & 0x8)
2653                         cmd->se_cmd_flags |= SCF_FUA;
2654                 break;
2655         case VARIABLE_LENGTH_CMD:
2656                 service_action = get_unaligned_be16(&cdb[8]);
2657                 switch (service_action) {
2658                 case XDWRITEREAD_32:
2659                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2660                         if (sector_ret)
2661                                 goto out_unsupported_cdb;
2662                         size = transport_get_size(sectors, cdb, cmd);
2663                         /*
2664                          * Use WRITE_32 and READ_32 opcodes for the emulated
2665                          * XDWRITE_READ_32 logic.
2666                          */
2667                         cmd->t_task_lba = transport_lba_64_ext(cdb);
2668                         cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2669
2670                         /*
2671                          * Do now allow BIDI commands for passthrough mode.
2672                          */
2673                         if (passthrough)
2674                                 goto out_unsupported_cdb;
2675
2676                         /*
2677                          * Setup BIDI XOR callback to be run during after I/O
2678                          * completion.
2679                          */
2680                         cmd->transport_complete_callback = &transport_xor_callback;
2681                         if (cdb[1] & 0x8)
2682                                 cmd->se_cmd_flags |= SCF_FUA;
2683                         break;
2684                 case WRITE_SAME_32:
2685                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2686                         if (sector_ret)
2687                                 goto out_unsupported_cdb;
2688
2689                         if (sectors)
2690                                 size = transport_get_size(1, cdb, cmd);
2691                         else {
2692                                 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2693                                        " supported\n");
2694                                 goto out_invalid_cdb_field;
2695                         }
2696
2697                         cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2698                         cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2699
2700                         if (target_check_write_same_discard(&cdb[10], dev) < 0)
2701                                 goto out_unsupported_cdb;
2702                         if (!passthrough)
2703                                 cmd->execute_task = target_emulate_write_same;
2704                         break;
2705                 default:
2706                         pr_err("VARIABLE_LENGTH_CMD service action"
2707                                 " 0x%04x not supported\n", service_action);
2708                         goto out_unsupported_cdb;
2709                 }
2710                 break;
2711         case MAINTENANCE_IN:
2712                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2713                         /* MAINTENANCE_IN from SCC-2 */
2714                         /*
2715                          * Check for emulated MI_REPORT_TARGET_PGS.
2716                          */
2717                         if (cdb[1] == MI_REPORT_TARGET_PGS &&
2718                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2719                                 cmd->execute_task =
2720                                         target_emulate_report_target_port_groups;
2721                         }
2722                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2723                                (cdb[8] << 8) | cdb[9];
2724                 } else {
2725                         /* GPCMD_SEND_KEY from multi media commands */
2726                         size = (cdb[8] << 8) + cdb[9];
2727                 }
2728                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2729                 break;
2730         case MODE_SELECT:
2731                 size = cdb[4];
2732                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2733                 break;
2734         case MODE_SELECT_10:
2735                 size = (cdb[7] << 8) + cdb[8];
2736                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2737                 break;
2738         case MODE_SENSE:
2739                 size = cdb[4];
2740                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2741                 if (!passthrough)
2742                         cmd->execute_task = target_emulate_modesense;
2743                 break;
2744         case MODE_SENSE_10:
2745                 size = (cdb[7] << 8) + cdb[8];
2746                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2747                 if (!passthrough)
2748                         cmd->execute_task = target_emulate_modesense;
2749                 break;
2750         case GPCMD_READ_BUFFER_CAPACITY:
2751         case GPCMD_SEND_OPC:
2752         case LOG_SELECT:
2753         case LOG_SENSE:
2754                 size = (cdb[7] << 8) + cdb[8];
2755                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2756                 break;
2757         case READ_BLOCK_LIMITS:
2758                 size = READ_BLOCK_LEN;
2759                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2760                 break;
2761         case GPCMD_GET_CONFIGURATION:
2762         case GPCMD_READ_FORMAT_CAPACITIES:
2763         case GPCMD_READ_DISC_INFO:
2764         case GPCMD_READ_TRACK_RZONE_INFO:
2765                 size = (cdb[7] << 8) + cdb[8];
2766                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2767                 break;
2768         case PERSISTENT_RESERVE_IN:
2769                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2770                         cmd->execute_task = target_scsi3_emulate_pr_in;
2771                 size = (cdb[7] << 8) + cdb[8];
2772                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2773                 break;
2774         case PERSISTENT_RESERVE_OUT:
2775                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2776                         cmd->execute_task = target_scsi3_emulate_pr_out;
2777                 size = (cdb[7] << 8) + cdb[8];
2778                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2779                 break;
2780         case GPCMD_MECHANISM_STATUS:
2781         case GPCMD_READ_DVD_STRUCTURE:
2782                 size = (cdb[8] << 8) + cdb[9];
2783                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2784                 break;
2785         case READ_POSITION:
2786                 size = READ_POSITION_LEN;
2787                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2788                 break;
2789         case MAINTENANCE_OUT:
2790                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2791                         /* MAINTENANCE_OUT from SCC-2
2792                          *
2793                          * Check for emulated MO_SET_TARGET_PGS.
2794                          */
2795                         if (cdb[1] == MO_SET_TARGET_PGS &&
2796                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2797                                 cmd->execute_task =
2798                                         target_emulate_set_target_port_groups;
2799                         }
2800
2801                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2802                                (cdb[8] << 8) | cdb[9];
2803                 } else  {
2804                         /* GPCMD_REPORT_KEY from multi media commands */
2805                         size = (cdb[8] << 8) + cdb[9];
2806                 }
2807                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2808                 break;
2809         case INQUIRY:
2810                 size = (cdb[3] << 8) + cdb[4];
2811                 /*
2812                  * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2813                  * See spc4r17 section 5.3
2814                  */
2815                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2816                         cmd->sam_task_attr = MSG_HEAD_TAG;
2817                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2818                 if (!passthrough)
2819                         cmd->execute_task = target_emulate_inquiry;
2820                 break;
2821         case READ_BUFFER:
2822                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2823                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2824                 break;
2825         case READ_CAPACITY:
2826                 size = READ_CAP_LEN;
2827                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2828                 if (!passthrough)
2829                         cmd->execute_task = target_emulate_readcapacity;
2830                 break;
2831         case READ_MEDIA_SERIAL_NUMBER:
2832         case SECURITY_PROTOCOL_IN:
2833         case SECURITY_PROTOCOL_OUT:
2834                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2835                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2836                 break;
2837         case SERVICE_ACTION_IN:
2838                 switch (cmd->t_task_cdb[1] & 0x1f) {
2839                 case SAI_READ_CAPACITY_16:
2840                         if (!passthrough)
2841                                 cmd->execute_task =
2842                                         target_emulate_readcapacity_16;
2843                         break;
2844                 default:
2845                         if (passthrough)
2846                                 break;
2847
2848                         pr_err("Unsupported SA: 0x%02x\n",
2849                                 cmd->t_task_cdb[1] & 0x1f);
2850                         goto out_unsupported_cdb;
2851                 }
2852                 /*FALLTHROUGH*/
2853         case ACCESS_CONTROL_IN:
2854         case ACCESS_CONTROL_OUT:
2855         case EXTENDED_COPY:
2856         case READ_ATTRIBUTE:
2857         case RECEIVE_COPY_RESULTS:
2858         case WRITE_ATTRIBUTE:
2859                 size = (cdb[10] << 24) | (cdb[11] << 16) |
2860                        (cdb[12] << 8) | cdb[13];
2861                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2862                 break;
2863         case RECEIVE_DIAGNOSTIC:
2864         case SEND_DIAGNOSTIC:
2865                 size = (cdb[3] << 8) | cdb[4];
2866                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2867                 break;
2868 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2869 #if 0
2870         case GPCMD_READ_CD:
2871                 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2872                 size = (2336 * sectors);
2873                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2874                 break;
2875 #endif
2876         case READ_TOC:
2877                 size = cdb[8];
2878                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2879                 break;
2880         case REQUEST_SENSE:
2881                 size = cdb[4];
2882                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2883                 if (!passthrough)
2884                         cmd->execute_task = target_emulate_request_sense;
2885                 break;
2886         case READ_ELEMENT_STATUS:
2887                 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
2888                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2889                 break;
2890         case WRITE_BUFFER:
2891                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2892                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2893                 break;
2894         case RESERVE:
2895         case RESERVE_10:
2896                 /*
2897                  * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2898                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2899                  */
2900                 if (cdb[0] == RESERVE_10)
2901                         size = (cdb[7] << 8) | cdb[8];
2902                 else
2903                         size = cmd->data_length;
2904
2905                 /*
2906                  * Setup the legacy emulated handler for SPC-2 and
2907                  * >= SPC-3 compatible reservation handling (CRH=1)
2908                  * Otherwise, we assume the underlying SCSI logic is
2909                  * is running in SPC_PASSTHROUGH, and wants reservations
2910                  * emulation disabled.
2911                  */
2912                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2913                         cmd->execute_task = target_scsi2_reservation_reserve;
2914                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2915                 break;
2916         case RELEASE:
2917         case RELEASE_10:
2918                 /*
2919                  * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2920                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2921                 */
2922                 if (cdb[0] == RELEASE_10)
2923                         size = (cdb[7] << 8) | cdb[8];
2924                 else
2925                         size = cmd->data_length;
2926
2927                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2928                         cmd->execute_task = target_scsi2_reservation_release;
2929                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2930                 break;
2931         case SYNCHRONIZE_CACHE:
2932         case 0x91: /* SYNCHRONIZE_CACHE_16: */
2933                 /*
2934                  * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2935                  */
2936                 if (cdb[0] == SYNCHRONIZE_CACHE) {
2937                         sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2938                         cmd->t_task_lba = transport_lba_32(cdb);
2939                 } else {
2940                         sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2941                         cmd->t_task_lba = transport_lba_64(cdb);
2942                 }
2943                 if (sector_ret)
2944                         goto out_unsupported_cdb;
2945
2946                 size = transport_get_size(sectors, cdb, cmd);
2947                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2948
2949                 if (passthrough)
2950                         break;
2951
2952                 /*
2953                  * Check to ensure that LBA + Range does not exceed past end of
2954                  * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
2955                  */
2956                 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2957                         if (transport_cmd_get_valid_sectors(cmd) < 0)
2958                                 goto out_invalid_cdb_field;
2959                 }
2960                 cmd->execute_task = target_emulate_synchronize_cache;
2961                 break;
2962         case UNMAP:
2963                 size = get_unaligned_be16(&cdb[7]);
2964                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2965                 if (!passthrough)
2966                         cmd->execute_task = target_emulate_unmap;
2967                 break;
2968         case WRITE_SAME_16:
2969                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2970                 if (sector_ret)
2971                         goto out_unsupported_cdb;
2972
2973                 if (sectors)
2974                         size = transport_get_size(1, cdb, cmd);
2975                 else {
2976                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2977                         goto out_invalid_cdb_field;
2978                 }
2979
2980                 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
2981                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2982
2983                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2984                         goto out_unsupported_cdb;
2985                 if (!passthrough)
2986                         cmd->execute_task = target_emulate_write_same;
2987                 break;
2988         case WRITE_SAME:
2989                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2990                 if (sector_ret)
2991                         goto out_unsupported_cdb;
2992
2993                 if (sectors)
2994                         size = transport_get_size(1, cdb, cmd);
2995                 else {
2996                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2997                         goto out_invalid_cdb_field;
2998                 }
2999
3000                 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
3001                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3002                 /*
3003                  * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3004                  * of byte 1 bit 3 UNMAP instead of original reserved field
3005                  */
3006                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3007                         goto out_unsupported_cdb;
3008                 if (!passthrough)
3009                         cmd->execute_task = target_emulate_write_same;
3010                 break;
3011         case ALLOW_MEDIUM_REMOVAL:
3012         case ERASE:
3013         case REZERO_UNIT:
3014         case SEEK_10:
3015         case SPACE:
3016         case START_STOP:
3017         case TEST_UNIT_READY:
3018         case VERIFY:
3019         case WRITE_FILEMARKS:
3020                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3021                 if (!passthrough)
3022                         cmd->execute_task = target_emulate_noop;
3023                 break;
3024         case GPCMD_CLOSE_TRACK:
3025         case INITIALIZE_ELEMENT_STATUS:
3026         case GPCMD_LOAD_UNLOAD:
3027         case GPCMD_SET_SPEED:
3028         case MOVE_MEDIUM:
3029                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3030                 break;
3031         case REPORT_LUNS:
3032                 cmd->execute_task = target_report_luns;
3033                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3034                 /*
3035                  * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3036                  * See spc4r17 section 5.3
3037                  */
3038                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3039                         cmd->sam_task_attr = MSG_HEAD_TAG;
3040                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3041                 break;
3042         default:
3043                 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3044                         " 0x%02x, sending CHECK_CONDITION.\n",
3045                         cmd->se_tfo->get_fabric_name(), cdb[0]);
3046                 goto out_unsupported_cdb;
3047         }
3048
3049         if (size != cmd->data_length) {
3050                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3051                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3052                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3053                                 cmd->data_length, size, cdb[0]);
3054
3055                 cmd->cmd_spdtl = size;
3056
3057                 if (cmd->data_direction == DMA_TO_DEVICE) {
3058                         pr_err("Rejecting underflow/overflow"
3059                                         " WRITE data\n");
3060                         goto out_invalid_cdb_field;
3061                 }
3062                 /*
3063                  * Reject READ_* or WRITE_* with overflow/underflow for
3064                  * type SCF_SCSI_DATA_SG_IO_CDB.
3065                  */
3066                 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512))  {
3067                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3068                                 " CDB on non 512-byte sector setup subsystem"
3069                                 " plugin: %s\n", dev->transport->name);
3070                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3071                         goto out_invalid_cdb_field;
3072                 }
3073
3074                 if (size > cmd->data_length) {
3075                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3076                         cmd->residual_count = (size - cmd->data_length);
3077                 } else {
3078                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3079                         cmd->residual_count = (cmd->data_length - size);
3080                 }
3081                 cmd->data_length = size;
3082         }
3083
3084         /* reject any command that we don't have a handler for */
3085         if (!(passthrough || cmd->execute_task ||
3086              (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3087                 goto out_unsupported_cdb;
3088
3089         transport_set_supported_SAM_opcode(cmd);
3090         return ret;
3091
3092 out_unsupported_cdb:
3093         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3094         cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3095         return -EINVAL;
3096 out_invalid_cdb_field:
3097         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3098         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3099         return -EINVAL;
3100 }
3101
3102 /*
3103  * Called from I/O completion to determine which dormant/delayed
3104  * and ordered cmds need to have their tasks added to the execution queue.
3105  */
3106 static void transport_complete_task_attr(struct se_cmd *cmd)
3107 {
3108         struct se_device *dev = cmd->se_dev;
3109         struct se_cmd *cmd_p, *cmd_tmp;
3110         int new_active_tasks = 0;
3111
3112         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3113                 atomic_dec(&dev->simple_cmds);
3114                 smp_mb__after_atomic_dec();
3115                 dev->dev_cur_ordered_id++;
3116                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3117                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3118                         cmd->se_ordered_id);
3119         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3120                 dev->dev_cur_ordered_id++;
3121                 pr_debug("Incremented dev_cur_ordered_id: %u for"
3122                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3123                         cmd->se_ordered_id);
3124         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3125                 atomic_dec(&dev->dev_ordered_sync);
3126                 smp_mb__after_atomic_dec();
3127
3128                 dev->dev_cur_ordered_id++;
3129                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3130                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3131         }
3132         /*
3133          * Process all commands up to the last received
3134          * ORDERED task attribute which requires another blocking
3135          * boundary
3136          */
3137         spin_lock(&dev->delayed_cmd_lock);
3138         list_for_each_entry_safe(cmd_p, cmd_tmp,
3139                         &dev->delayed_cmd_list, se_delayed_node) {
3140
3141                 list_del(&cmd_p->se_delayed_node);
3142                 spin_unlock(&dev->delayed_cmd_lock);
3143
3144                 pr_debug("Calling add_tasks() for"
3145                         " cmd_p: 0x%02x Task Attr: 0x%02x"
3146                         " Dormant -> Active, se_ordered_id: %u\n",
3147                         cmd_p->t_task_cdb[0],
3148                         cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3149
3150                 transport_add_tasks_from_cmd(cmd_p);
3151                 new_active_tasks++;
3152
3153                 spin_lock(&dev->delayed_cmd_lock);
3154                 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3155                         break;
3156         }
3157         spin_unlock(&dev->delayed_cmd_lock);
3158         /*
3159          * If new tasks have become active, wake up the transport thread
3160          * to do the processing of the Active tasks.
3161          */
3162         if (new_active_tasks != 0)
3163                 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3164 }
3165
3166 static void transport_complete_qf(struct se_cmd *cmd)
3167 {
3168         int ret = 0;
3169
3170         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3171                 transport_complete_task_attr(cmd);
3172
3173         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3174                 ret = cmd->se_tfo->queue_status(cmd);
3175                 if (ret)
3176                         goto out;
3177         }
3178
3179         switch (cmd->data_direction) {
3180         case DMA_FROM_DEVICE:
3181                 ret = cmd->se_tfo->queue_data_in(cmd);
3182                 break;
3183         case DMA_TO_DEVICE:
3184                 if (cmd->t_bidi_data_sg) {
3185                         ret = cmd->se_tfo->queue_data_in(cmd);
3186                         if (ret < 0)
3187                                 break;
3188                 }
3189                 /* Fall through for DMA_TO_DEVICE */
3190         case DMA_NONE:
3191                 ret = cmd->se_tfo->queue_status(cmd);
3192                 break;
3193         default:
3194                 break;
3195         }
3196
3197 out:
3198         if (ret < 0) {
3199                 transport_handle_queue_full(cmd, cmd->se_dev);
3200                 return;
3201         }
3202         transport_lun_remove_cmd(cmd);
3203         transport_cmd_check_stop_to_fabric(cmd);
3204 }
3205
3206 static void transport_handle_queue_full(
3207         struct se_cmd *cmd,
3208         struct se_device *dev)
3209 {
3210         spin_lock_irq(&dev->qf_cmd_lock);
3211         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3212         atomic_inc(&dev->dev_qf_count);
3213         smp_mb__after_atomic_inc();
3214         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3215
3216         schedule_work(&cmd->se_dev->qf_work_queue);
3217 }
3218
3219 static void target_complete_ok_work(struct work_struct *work)
3220 {
3221         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3222         int reason = 0, ret;
3223
3224         /*
3225          * Check if we need to move delayed/dormant tasks from cmds on the
3226          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3227          * Attribute.
3228          */
3229         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3230                 transport_complete_task_attr(cmd);
3231         /*
3232          * Check to schedule QUEUE_FULL work, or execute an existing
3233          * cmd->transport_qf_callback()
3234          */
3235         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3236                 schedule_work(&cmd->se_dev->qf_work_queue);
3237
3238         /*
3239          * Check if we need to retrieve a sense buffer from
3240          * the struct se_cmd in question.
3241          */
3242         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3243                 if (transport_get_sense_data(cmd) < 0)
3244                         reason = TCM_NON_EXISTENT_LUN;
3245
3246                 /*
3247                  * Only set when an struct se_task->task_scsi_status returned
3248                  * a non GOOD status.
3249                  */
3250                 if (cmd->scsi_status) {
3251                         ret = transport_send_check_condition_and_sense(
3252                                         cmd, reason, 1);
3253                         if (ret == -EAGAIN || ret == -ENOMEM)
3254                                 goto queue_full;
3255
3256                         transport_lun_remove_cmd(cmd);
3257                         transport_cmd_check_stop_to_fabric(cmd);
3258                         return;
3259                 }
3260         }
3261         /*
3262          * Check for a callback, used by amongst other things
3263          * XDWRITE_READ_10 emulation.
3264          */
3265         if (cmd->transport_complete_callback)
3266                 cmd->transport_complete_callback(cmd);
3267
3268         switch (cmd->data_direction) {
3269         case DMA_FROM_DEVICE:
3270                 spin_lock(&cmd->se_lun->lun_sep_lock);
3271                 if (cmd->se_lun->lun_sep) {
3272                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3273                                         cmd->data_length;
3274                 }
3275                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3276
3277                 ret = cmd->se_tfo->queue_data_in(cmd);
3278                 if (ret == -EAGAIN || ret == -ENOMEM)
3279                         goto queue_full;
3280                 break;
3281         case DMA_TO_DEVICE:
3282                 spin_lock(&cmd->se_lun->lun_sep_lock);
3283                 if (cmd->se_lun->lun_sep) {
3284                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3285                                 cmd->data_length;
3286                 }
3287                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3288                 /*
3289                  * Check if we need to send READ payload for BIDI-COMMAND
3290                  */
3291                 if (cmd->t_bidi_data_sg) {
3292                         spin_lock(&cmd->se_lun->lun_sep_lock);
3293                         if (cmd->se_lun->lun_sep) {
3294                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3295                                         cmd->data_length;
3296                         }
3297                         spin_unlock(&cmd->se_lun->lun_sep_lock);
3298                         ret = cmd->se_tfo->queue_data_in(cmd);
3299                         if (ret == -EAGAIN || ret == -ENOMEM)
3300                                 goto queue_full;
3301                         break;
3302                 }
3303                 /* Fall through for DMA_TO_DEVICE */
3304         case DMA_NONE:
3305                 ret = cmd->se_tfo->queue_status(cmd);
3306                 if (ret == -EAGAIN || ret == -ENOMEM)
3307                         goto queue_full;
3308                 break;
3309         default:
3310                 break;
3311         }
3312
3313         transport_lun_remove_cmd(cmd);
3314         transport_cmd_check_stop_to_fabric(cmd);
3315         return;
3316
3317 queue_full:
3318         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3319                 " data_direction: %d\n", cmd, cmd->data_direction);
3320         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3321         transport_handle_queue_full(cmd, cmd->se_dev);
3322 }
3323
3324 static void transport_free_dev_tasks(struct se_cmd *cmd)
3325 {
3326         struct se_task *task, *task_tmp;
3327         unsigned long flags;
3328         LIST_HEAD(dispose_list);
3329
3330         spin_lock_irqsave(&cmd->t_state_lock, flags);
3331         list_for_each_entry_safe(task, task_tmp,
3332                                 &cmd->t_task_list, t_list) {
3333                 if (!(task->task_flags & TF_ACTIVE))
3334                         list_move_tail(&task->t_list, &dispose_list);
3335         }
3336         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3337
3338         while (!list_empty(&dispose_list)) {
3339                 task = list_first_entry(&dispose_list, struct se_task, t_list);
3340
3341                 if (task->task_sg != cmd->t_data_sg &&
3342                     task->task_sg != cmd->t_bidi_data_sg)
3343                         kfree(task->task_sg);
3344
3345                 list_del(&task->t_list);
3346
3347                 cmd->se_dev->transport->free_task(task);
3348         }
3349 }
3350
3351 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3352 {
3353         struct scatterlist *sg;
3354         int count;
3355
3356         for_each_sg(sgl, sg, nents, count)
3357                 __free_page(sg_page(sg));
3358
3359         kfree(sgl);
3360 }
3361
3362 static inline void transport_free_pages(struct se_cmd *cmd)
3363 {
3364         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3365                 return;
3366
3367         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3368         cmd->t_data_sg = NULL;
3369         cmd->t_data_nents = 0;
3370
3371         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3372         cmd->t_bidi_data_sg = NULL;
3373         cmd->t_bidi_data_nents = 0;
3374 }
3375
3376 /**
3377  * transport_release_cmd - free a command
3378  * @cmd:       command to free
3379  *
3380  * This routine unconditionally frees a command, and reference counting
3381  * or list removal must be done in the caller.
3382  */
3383 static void transport_release_cmd(struct se_cmd *cmd)
3384 {
3385         BUG_ON(!cmd->se_tfo);
3386
3387         if (cmd->se_tmr_req)
3388                 core_tmr_release_req(cmd->se_tmr_req);
3389         if (cmd->t_task_cdb != cmd->__t_task_cdb)
3390                 kfree(cmd->t_task_cdb);
3391         /*
3392          * If this cmd has been setup with target_get_sess_cmd(), drop
3393          * the kref and call ->release_cmd() in kref callback.
3394          */
3395          if (cmd->check_release != 0) {
3396                 target_put_sess_cmd(cmd->se_sess, cmd);
3397                 return;
3398         }
3399         cmd->se_tfo->release_cmd(cmd);
3400 }
3401
3402 /**
3403  * transport_put_cmd - release a reference to a command
3404  * @cmd:       command to release
3405  *
3406  * This routine releases our reference to the command and frees it if possible.
3407  */
3408 static void transport_put_cmd(struct se_cmd *cmd)
3409 {
3410         unsigned long flags;
3411         int free_tasks = 0;
3412
3413         spin_lock_irqsave(&cmd->t_state_lock, flags);
3414         if (atomic_read(&cmd->t_fe_count)) {
3415                 if (!atomic_dec_and_test(&cmd->t_fe_count))
3416                         goto out_busy;
3417         }
3418
3419         if (atomic_read(&cmd->t_se_count)) {
3420                 if (!atomic_dec_and_test(&cmd->t_se_count))
3421                         goto out_busy;
3422         }
3423
3424         if (atomic_read(&cmd->transport_dev_active)) {
3425                 atomic_set(&cmd->transport_dev_active, 0);
3426                 transport_all_task_dev_remove_state(cmd);
3427                 free_tasks = 1;
3428         }
3429         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3430
3431         if (free_tasks != 0)
3432                 transport_free_dev_tasks(cmd);
3433
3434         transport_free_pages(cmd);
3435         transport_release_cmd(cmd);
3436         return;
3437 out_busy:
3438         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3439 }
3440
3441 /*
3442  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3443  * allocating in the core.
3444  * @cmd:  Associated se_cmd descriptor
3445  * @mem:  SGL style memory for TCM WRITE / READ
3446  * @sg_mem_num: Number of SGL elements
3447  * @mem_bidi_in: SGL style memory for TCM BIDI READ
3448  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3449  *
3450  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3451  * of parameters.
3452  */
3453 int transport_generic_map_mem_to_cmd(
3454         struct se_cmd *cmd,
3455         struct scatterlist *sgl,
3456         u32 sgl_count,
3457         struct scatterlist *sgl_bidi,
3458         u32 sgl_bidi_count)
3459 {
3460         if (!sgl || !sgl_count)
3461                 return 0;
3462
3463         if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3464             (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3465                 /*
3466                  * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3467                  * scatterlists already have been set to follow what the fabric
3468                  * passes for the original expected data transfer length.
3469                  */
3470                 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3471                         pr_warn("Rejecting SCSI DATA overflow for fabric using"
3472                                 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3473                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3474                         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3475                         return -EINVAL;
3476                 }
3477
3478                 cmd->t_data_sg = sgl;
3479                 cmd->t_data_nents = sgl_count;
3480
3481                 if (sgl_bidi && sgl_bidi_count) {
3482                         cmd->t_bidi_data_sg = sgl_bidi;
3483                         cmd->t_bidi_data_nents = sgl_bidi_count;
3484                 }
3485                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3486         }
3487
3488         return 0;
3489 }
3490 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3491
3492 void *transport_kmap_data_sg(struct se_cmd *cmd)
3493 {
3494         struct scatterlist *sg = cmd->t_data_sg;
3495         struct page **pages;
3496         int i;
3497
3498         BUG_ON(!sg);
3499         /*
3500          * We need to take into account a possible offset here for fabrics like
3501          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3502          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3503          */
3504         if (!cmd->t_data_nents)
3505                 return NULL;
3506         else if (cmd->t_data_nents == 1)
3507                 return kmap(sg_page(sg)) + sg->offset;
3508
3509         /* >1 page. use vmap */
3510         pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3511         if (!pages)
3512                 return NULL;
3513
3514         /* convert sg[] to pages[] */
3515         for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
3516                 pages[i] = sg_page(sg);
3517         }
3518
3519         cmd->t_data_vmap = vmap(pages, cmd->t_data_nents,  VM_MAP, PAGE_KERNEL);
3520         kfree(pages);
3521         if (!cmd->t_data_vmap)
3522                 return NULL;
3523
3524         return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
3525 }
3526 EXPORT_SYMBOL(transport_kmap_data_sg);
3527
3528 void transport_kunmap_data_sg(struct se_cmd *cmd)
3529 {
3530         if (!cmd->t_data_nents)
3531                 return;
3532         else if (cmd->t_data_nents == 1)
3533                 kunmap(sg_page(cmd->t_data_sg));
3534
3535         vunmap(cmd->t_data_vmap);
3536         cmd->t_data_vmap = NULL;
3537 }
3538 EXPORT_SYMBOL(transport_kunmap_data_sg);
3539
3540 static int
3541 transport_generic_get_mem(struct se_cmd *cmd)
3542 {
3543         u32 length = cmd->data_length;
3544         unsigned int nents;
3545         struct page *page;
3546         gfp_t zero_flag;
3547         int i = 0;
3548
3549         nents = DIV_ROUND_UP(length, PAGE_SIZE);
3550         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3551         if (!cmd->t_data_sg)
3552                 return -ENOMEM;
3553
3554         cmd->t_data_nents = nents;
3555         sg_init_table(cmd->t_data_sg, nents);
3556
3557         zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
3558
3559         while (length) {
3560                 u32 page_len = min_t(u32, length, PAGE_SIZE);
3561                 page = alloc_page(GFP_KERNEL | zero_flag);
3562                 if (!page)
3563                         goto out;
3564
3565                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3566                 length -= page_len;
3567                 i++;
3568         }
3569         return 0;
3570
3571 out:
3572         while (i >= 0) {
3573                 __free_page(sg_page(&cmd->t_data_sg[i]));
3574                 i--;
3575         }
3576         kfree(cmd->t_data_sg);
3577         cmd->t_data_sg = NULL;
3578         return -ENOMEM;
3579 }
3580
3581 /* Reduce sectors if they are too long for the device */
3582 static inline sector_t transport_limit_task_sectors(
3583         struct se_device *dev,
3584         unsigned long long lba,
3585         sector_t sectors)
3586 {
3587         sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
3588
3589         if (dev->transport->get_device_type(dev) == TYPE_DISK)
3590                 if ((lba + sectors) > transport_dev_end_lba(dev))
3591                         sectors = ((transport_dev_end_lba(dev) - lba) + 1);
3592
3593         return sectors;
3594 }
3595
3596
3597 /*
3598  * This function can be used by HW target mode drivers to create a linked
3599  * scatterlist from all contiguously allocated struct se_task->task_sg[].
3600  * This is intended to be called during the completion path by TCM Core
3601  * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3602  */
3603 void transport_do_task_sg_chain(struct se_cmd *cmd)
3604 {
3605         struct scatterlist *sg_first = NULL;
3606         struct scatterlist *sg_prev = NULL;
3607         int sg_prev_nents = 0;
3608         struct scatterlist *sg;
3609         struct se_task *task;
3610         u32 chained_nents = 0;
3611         int i;
3612
3613         BUG_ON(!cmd->se_tfo->task_sg_chaining);
3614
3615         /*
3616          * Walk the struct se_task list and setup scatterlist chains
3617          * for each contiguously allocated struct se_task->task_sg[].
3618          */
3619         list_for_each_entry(task, &cmd->t_task_list, t_list) {
3620                 if (!task->task_sg)
3621                         continue;
3622
3623                 if (!sg_first) {
3624                         sg_first = task->task_sg;
3625                         chained_nents = task->task_sg_nents;
3626                 } else {
3627                         sg_chain(sg_prev, sg_prev_nents, task->task_sg);
3628                         chained_nents += task->task_sg_nents;
3629                 }
3630                 /*
3631                  * For the padded tasks, use the extra SGL vector allocated
3632                  * in transport_allocate_data_tasks() for the sg_prev_nents
3633                  * offset into sg_chain() above.
3634                  *
3635                  * We do not need the padding for the last task (or a single
3636                  * task), but in that case we will never use the sg_prev_nents
3637                  * value below which would be incorrect.
3638                  */
3639                 sg_prev_nents = (task->task_sg_nents + 1);
3640                 sg_prev = task->task_sg;
3641         }
3642         /*
3643          * Setup the starting pointer and total t_tasks_sg_linked_no including
3644          * padding SGs for linking and to mark the end.
3645          */
3646         cmd->t_tasks_sg_chained = sg_first;
3647         cmd->t_tasks_sg_chained_no = chained_nents;
3648
3649         pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3650                 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3651                 cmd->t_tasks_sg_chained_no);
3652
3653         for_each_sg(cmd->t_tasks_sg_chained, sg,
3654                         cmd->t_tasks_sg_chained_no, i) {
3655
3656                 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3657                         i, sg, sg_page(sg), sg->length, sg->offset);
3658                 if (sg_is_chain(sg))
3659                         pr_debug("SG: %p sg_is_chain=1\n", sg);
3660                 if (sg_is_last(sg))
3661                         pr_debug("SG: %p sg_is_last=1\n", sg);
3662         }
3663 }
3664 EXPORT_SYMBOL(transport_do_task_sg_chain);
3665
3666 /*
3667  * Break up cmd into chunks transport can handle
3668  */
3669 static int
3670 transport_allocate_data_tasks(struct se_cmd *cmd,
3671         enum dma_data_direction data_direction,
3672         struct scatterlist *cmd_sg, unsigned int sgl_nents)
3673 {
3674         struct se_device *dev = cmd->se_dev;
3675         int task_count, i;
3676         unsigned long long lba;
3677         sector_t sectors, dev_max_sectors;
3678         u32 sector_size;
3679
3680         if (transport_cmd_get_valid_sectors(cmd) < 0)
3681                 return -EINVAL;
3682
3683         dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3684         sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3685
3686         WARN_ON(cmd->data_length % sector_size);
3687
3688         lba = cmd->t_task_lba;
3689         sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
3690         task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3691
3692         /*
3693          * If we need just a single task reuse the SG list in the command
3694          * and avoid a lot of work.
3695          */
3696         if (task_count == 1) {
3697                 struct se_task *task;
3698                 unsigned long flags;
3699
3700                 task = transport_generic_get_task(cmd, data_direction);
3701                 if (!task)
3702                         return -ENOMEM;
3703
3704                 task->task_sg = cmd_sg;
3705                 task->task_sg_nents = sgl_nents;
3706
3707                 task->task_lba = lba;
3708                 task->task_sectors = sectors;
3709                 task->task_size = task->task_sectors * sector_size;
3710
3711                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3712                 list_add_tail(&task->t_list, &cmd->t_task_list);
3713                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3714
3715                 return task_count;
3716         }
3717
3718         for (i = 0; i < task_count; i++) {
3719                 struct se_task *task;
3720                 unsigned int task_size, task_sg_nents_padded;
3721                 struct scatterlist *sg;
3722                 unsigned long flags;
3723                 int count;
3724
3725                 task = transport_generic_get_task(cmd, data_direction);
3726                 if (!task)
3727                         return -ENOMEM;
3728
3729                 task->task_lba = lba;
3730                 task->task_sectors = min(sectors, dev_max_sectors);
3731                 task->task_size = task->task_sectors * sector_size;
3732
3733                 /*
3734                  * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3735                  * in order to calculate the number per task SGL entries
3736                  */
3737                 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
3738                 /*
3739                  * Check if the fabric module driver is requesting that all
3740                  * struct se_task->task_sg[] be chained together..  If so,
3741                  * then allocate an extra padding SG entry for linking and
3742                  * marking the end of the chained SGL for every task except
3743                  * the last one for (task_count > 1) operation, or skipping
3744                  * the extra padding for the (task_count == 1) case.
3745                  */
3746                 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3747                         task_sg_nents_padded = (task->task_sg_nents + 1);
3748                 } else
3749                         task_sg_nents_padded = task->task_sg_nents;
3750
3751                 task->task_sg = kmalloc(sizeof(struct scatterlist) *
3752                                         task_sg_nents_padded, GFP_KERNEL);
3753                 if (!task->task_sg) {
3754                         cmd->se_dev->transport->free_task(task);
3755                         return -ENOMEM;
3756                 }
3757
3758                 sg_init_table(task->task_sg, task_sg_nents_padded);
3759
3760                 task_size = task->task_size;
3761
3762                 /* Build new sgl, only up to task_size */
3763                 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
3764                         if (cmd_sg->length > task_size)
3765                                 break;
3766
3767                         *sg = *cmd_sg;
3768                         task_size -= cmd_sg->length;
3769                         cmd_sg = sg_next(cmd_sg);
3770                 }
3771
3772                 lba += task->task_sectors;
3773                 sectors -= task->task_sectors;
3774
3775                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3776                 list_add_tail(&task->t_list, &cmd->t_task_list);
3777                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3778         }
3779
3780         return task_count;
3781 }
3782
3783 static int
3784 transport_allocate_control_task(struct se_cmd *cmd)
3785 {
3786         struct se_task *task;
3787         unsigned long flags;
3788
3789         /* Workaround for handling zero-length control CDBs */
3790         if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3791             !cmd->data_length)
3792                 return 0;
3793
3794         task = transport_generic_get_task(cmd, cmd->data_direction);
3795         if (!task)
3796                 return -ENOMEM;
3797
3798         task->task_sg = cmd->t_data_sg;
3799         task->task_size = cmd->data_length;
3800         task->task_sg_nents = cmd->t_data_nents;
3801
3802         spin_lock_irqsave(&cmd->t_state_lock, flags);
3803         list_add_tail(&task->t_list, &cmd->t_task_list);
3804         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3805
3806         /* Success! Return number of tasks allocated */
3807         return 1;
3808 }
3809
3810 /*
3811  * Allocate any required ressources to execute the command, and either place
3812  * it on the execution queue if possible.  For writes we might not have the
3813  * payload yet, thus notify the fabric via a call to ->write_pending instead.
3814  */
3815 int transport_generic_new_cmd(struct se_cmd *cmd)
3816 {
3817         struct se_device *dev = cmd->se_dev;
3818         int task_cdbs, task_cdbs_bidi = 0;
3819         int set_counts = 1;
3820         int ret = 0;
3821
3822         /*
3823          * Determine is the TCM fabric module has already allocated physical
3824          * memory, and is directly calling transport_generic_map_mem_to_cmd()
3825          * beforehand.
3826          */
3827         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3828             cmd->data_length) {
3829                 ret = transport_generic_get_mem(cmd);
3830                 if (ret < 0)
3831                         goto out_fail;
3832         }
3833
3834         /*
3835          * For BIDI command set up the read tasks first.
3836          */
3837         if (cmd->t_bidi_data_sg &&
3838             dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3839                 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3840
3841                 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3842                                 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3843                                 cmd->t_bidi_data_nents);
3844                 if (task_cdbs_bidi <= 0)
3845                         goto out_fail;
3846
3847                 atomic_inc(&cmd->t_fe_count);
3848                 atomic_inc(&cmd->t_se_count);
3849                 set_counts = 0;
3850         }
3851
3852         if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3853                 task_cdbs = transport_allocate_data_tasks(cmd,
3854                                         cmd->data_direction, cmd->t_data_sg,
3855                                         cmd->t_data_nents);
3856         } else {
3857                 task_cdbs = transport_allocate_control_task(cmd);
3858         }
3859
3860         if (task_cdbs < 0)
3861                 goto out_fail;
3862         else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
3863                 cmd->t_state = TRANSPORT_COMPLETE;
3864                 atomic_set(&cmd->t_transport_active, 1);
3865
3866                 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
3867                         u8 ua_asc = 0, ua_ascq = 0;
3868
3869                         core_scsi3_ua_clear_for_request_sense(cmd,
3870                                         &ua_asc, &ua_ascq);
3871                 }
3872
3873                 INIT_WORK(&cmd->work, target_complete_ok_work);
3874                 queue_work(target_completion_wq, &cmd->work);
3875                 return 0;
3876         }
3877
3878         if (set_counts) {
3879                 atomic_inc(&cmd->t_fe_count);
3880                 atomic_inc(&cmd->t_se_count);
3881         }
3882
3883         cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3884         atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3885         atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
3886
3887         /*
3888          * For WRITEs, let the fabric know its buffer is ready..
3889          * This WRITE struct se_cmd (and all of its associated struct se_task's)
3890          * will be added to the struct se_device execution queue after its WRITE
3891          * data has arrived. (ie: It gets handled by the transport processing
3892          * thread a second time)
3893          */
3894         if (cmd->data_direction == DMA_TO_DEVICE) {
3895                 transport_add_tasks_to_state_queue(cmd);
3896                 return transport_generic_write_pending(cmd);
3897         }
3898         /*
3899          * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3900          * to the execution queue.
3901          */
3902         transport_execute_tasks(cmd);
3903         return 0;
3904
3905 out_fail:
3906         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3907         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3908         return -EINVAL;
3909 }
3910 EXPORT_SYMBOL(transport_generic_new_cmd);
3911
3912 /*      transport_generic_process_write():
3913  *
3914  *
3915  */
3916 void transport_generic_process_write(struct se_cmd *cmd)
3917 {
3918         transport_execute_tasks(cmd);
3919 }
3920 EXPORT_SYMBOL(transport_generic_process_write);
3921
3922 static void transport_write_pending_qf(struct se_cmd *cmd)
3923 {
3924         int ret;
3925
3926         ret = cmd->se_tfo->write_pending(cmd);
3927         if (ret == -EAGAIN || ret == -ENOMEM) {
3928                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3929                          cmd);
3930                 transport_handle_queue_full(cmd, cmd->se_dev);
3931         }
3932 }
3933
3934 static int transport_generic_write_pending(struct se_cmd *cmd)
3935 {
3936         unsigned long flags;
3937         int ret;
3938
3939         spin_lock_irqsave(&cmd->t_state_lock, flags);
3940         cmd->t_state = TRANSPORT_WRITE_PENDING;
3941         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3942
3943         /*
3944          * Clear the se_cmd for WRITE_PENDING status in order to set
3945          * cmd->t_transport_active=0 so that transport_generic_handle_data
3946          * can be called from HW target mode interrupt code.  This is safe
3947          * to be called with transport_off=1 before the cmd->se_tfo->write_pending
3948          * because the se_cmd->se_lun pointer is not being cleared.
3949          */
3950         transport_cmd_check_stop(cmd, 1, 0);
3951
3952         /*
3953          * Call the fabric write_pending function here to let the
3954          * frontend know that WRITE buffers are ready.
3955          */
3956         ret = cmd->se_tfo->write_pending(cmd);
3957         if (ret == -EAGAIN || ret == -ENOMEM)
3958                 goto queue_full;
3959         else if (ret < 0)
3960                 return ret;
3961
3962         return 1;
3963
3964 queue_full:
3965         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
3966         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
3967         transport_handle_queue_full(cmd, cmd->se_dev);
3968         return 0;
3969 }
3970
3971 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
3972 {
3973         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3974                 if (wait_for_tasks && cmd->se_tmr_req)
3975                          transport_wait_for_tasks(cmd);
3976
3977                 transport_release_cmd(cmd);
3978         } else {
3979                 if (wait_for_tasks)
3980                         transport_wait_for_tasks(cmd);
3981
3982                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3983
3984                 if (cmd->se_lun)
3985                         transport_lun_remove_cmd(cmd);
3986
3987                 transport_free_dev_tasks(cmd);
3988
3989                 transport_put_cmd(cmd);
3990         }
3991 }
3992 EXPORT_SYMBOL(transport_generic_free_cmd);
3993
3994 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3995  * @se_sess:    session to reference
3996  * @se_cmd:     command descriptor to add
3997  * @ack_kref:   Signal that fabric will perform an ack target_put_sess_cmd()
3998  */
3999 void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
4000                         bool ack_kref)
4001 {
4002         unsigned long flags;
4003
4004         kref_init(&se_cmd->cmd_kref);
4005         /*
4006          * Add a second kref if the fabric caller is expecting to handle
4007          * fabric acknowledgement that requires two target_put_sess_cmd()
4008          * invocations before se_cmd descriptor release.
4009          */
4010         if (ack_kref == true)
4011                 kref_get(&se_cmd->cmd_kref);
4012
4013         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4014         list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
4015         se_cmd->check_release = 1;
4016         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4017 }
4018 EXPORT_SYMBOL(target_get_sess_cmd);
4019
4020 static void target_release_cmd_kref(struct kref *kref)
4021 {
4022         struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
4023         struct se_session *se_sess = se_cmd->se_sess;
4024         unsigned long flags;
4025
4026         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4027         if (list_empty(&se_cmd->se_cmd_list)) {
4028                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4029                 WARN_ON(1);
4030                 return;
4031         }
4032         if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
4033                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4034                 complete(&se_cmd->cmd_wait_comp);
4035                 return;
4036         }
4037         list_del(&se_cmd->se_cmd_list);
4038         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4039
4040         se_cmd->se_tfo->release_cmd(se_cmd);
4041 }
4042
4043 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
4044  * @se_sess:    session to reference
4045  * @se_cmd:     command descriptor to drop
4046  */
4047 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
4048 {
4049         return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
4050 }
4051 EXPORT_SYMBOL(target_put_sess_cmd);
4052
4053 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
4054  * @se_sess:    session to split
4055  */
4056 void target_splice_sess_cmd_list(struct se_session *se_sess)
4057 {
4058         struct se_cmd *se_cmd;
4059         unsigned long flags;
4060
4061         WARN_ON(!list_empty(&se_sess->sess_wait_list));
4062         INIT_LIST_HEAD(&se_sess->sess_wait_list);
4063
4064         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4065         se_sess->sess_tearing_down = 1;
4066
4067         list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
4068
4069         list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
4070                 se_cmd->cmd_wait_set = 1;
4071
4072         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4073 }
4074 EXPORT_SYMBOL(target_splice_sess_cmd_list);
4075
4076 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
4077  * @se_sess:    session to wait for active I/O
4078  * @wait_for_tasks:     Make extra transport_wait_for_tasks call
4079  */
4080 void target_wait_for_sess_cmds(
4081         struct se_session *se_sess,
4082         int wait_for_tasks)
4083 {
4084         struct se_cmd *se_cmd, *tmp_cmd;
4085         bool rc = false;
4086
4087         list_for_each_entry_safe(se_cmd, tmp_cmd,
4088                                 &se_sess->sess_wait_list, se_cmd_list) {
4089                 list_del(&se_cmd->se_cmd_list);
4090
4091                 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4092                         " %d\n", se_cmd, se_cmd->t_state,
4093                         se_cmd->se_tfo->get_cmd_state(se_cmd));
4094
4095                 if (wait_for_tasks) {
4096                         pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4097                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4098                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
4099
4100                         rc = transport_wait_for_tasks(se_cmd);
4101
4102                         pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4103                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4104                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
4105                 }
4106
4107                 if (!rc) {
4108                         wait_for_completion(&se_cmd->cmd_wait_comp);
4109                         pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4110                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4111                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
4112                 }
4113
4114                 se_cmd->se_tfo->release_cmd(se_cmd);
4115         }
4116 }
4117 EXPORT_SYMBOL(target_wait_for_sess_cmds);
4118
4119 /*      transport_lun_wait_for_tasks():
4120  *
4121  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
4122  *      an struct se_lun to be successfully shutdown.
4123  */
4124 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4125 {
4126         unsigned long flags;
4127         int ret;
4128         /*
4129          * If the frontend has already requested this struct se_cmd to
4130          * be stopped, we can safely ignore this struct se_cmd.
4131          */
4132         spin_lock_irqsave(&cmd->t_state_lock, flags);
4133         if (atomic_read(&cmd->t_transport_stop)) {
4134                 atomic_set(&cmd->transport_lun_stop, 0);
4135                 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4136                         " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
4137                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4138                 transport_cmd_check_stop(cmd, 1, 0);
4139                 return -EPERM;
4140         }
4141         atomic_set(&cmd->transport_lun_fe_stop, 1);
4142         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4143
4144         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4145
4146         ret = transport_stop_tasks_for_cmd(cmd);
4147
4148         pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4149                         " %d\n", cmd, cmd->t_task_list_num, ret);
4150         if (!ret) {
4151                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4152                                 cmd->se_tfo->get_task_tag(cmd));
4153                 wait_for_completion(&cmd->transport_lun_stop_comp);
4154                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4155                                 cmd->se_tfo->get_task_tag(cmd));
4156         }
4157         transport_remove_cmd_from_queue(cmd);
4158
4159         return 0;
4160 }
4161
4162 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4163 {
4164         struct se_cmd *cmd = NULL;
4165         unsigned long lun_flags, cmd_flags;
4166         /*
4167          * Do exception processing and return CHECK_CONDITION status to the
4168          * Initiator Port.
4169          */
4170         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4171         while (!list_empty(&lun->lun_cmd_list)) {
4172                 cmd = list_first_entry(&lun->lun_cmd_list,
4173                        struct se_cmd, se_lun_node);
4174                 list_del(&cmd->se_lun_node);
4175
4176                 atomic_set(&cmd->transport_lun_active, 0);
4177                 /*
4178                  * This will notify iscsi_target_transport.c:
4179                  * transport_cmd_check_stop() that a LUN shutdown is in
4180                  * progress for the iscsi_cmd_t.
4181                  */
4182                 spin_lock(&cmd->t_state_lock);
4183                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4184                         "_lun_stop for  ITT: 0x%08x\n",
4185                         cmd->se_lun->unpacked_lun,
4186                         cmd->se_tfo->get_task_tag(cmd));
4187                 atomic_set(&cmd->transport_lun_stop, 1);
4188                 spin_unlock(&cmd->t_state_lock);
4189
4190                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4191
4192                 if (!cmd->se_lun) {
4193                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4194                                 cmd->se_tfo->get_task_tag(cmd),
4195                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4196                         BUG();
4197                 }
4198                 /*
4199                  * If the Storage engine still owns the iscsi_cmd_t, determine
4200                  * and/or stop its context.
4201                  */
4202                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4203                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4204                         cmd->se_tfo->get_task_tag(cmd));
4205
4206                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
4207                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4208                         continue;
4209                 }
4210
4211                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4212                         "_wait_for_tasks(): SUCCESS\n",
4213                         cmd->se_lun->unpacked_lun,
4214                         cmd->se_tfo->get_task_tag(cmd));
4215
4216                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4217                 if (!atomic_read(&cmd->transport_dev_active)) {
4218                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4219                         goto check_cond;
4220                 }
4221                 atomic_set(&cmd->transport_dev_active, 0);
4222                 transport_all_task_dev_remove_state(cmd);
4223                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4224
4225                 transport_free_dev_tasks(cmd);
4226                 /*
4227                  * The Storage engine stopped this struct se_cmd before it was
4228                  * send to the fabric frontend for delivery back to the
4229                  * Initiator Node.  Return this SCSI CDB back with an
4230                  * CHECK_CONDITION status.
4231                  */
4232 check_cond:
4233                 transport_send_check_condition_and_sense(cmd,
4234                                 TCM_NON_EXISTENT_LUN, 0);
4235                 /*
4236                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
4237                  * be released, notify the waiting thread now that LU has
4238                  * finished accessing it.
4239                  */
4240                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4241                 if (atomic_read(&cmd->transport_lun_fe_stop)) {
4242                         pr_debug("SE_LUN[%d] - Detected FE stop for"
4243                                 " struct se_cmd: %p ITT: 0x%08x\n",
4244                                 lun->unpacked_lun,
4245                                 cmd, cmd->se_tfo->get_task_tag(cmd));
4246
4247                         spin_unlock_irqrestore(&cmd->t_state_lock,
4248                                         cmd_flags);
4249                         transport_cmd_check_stop(cmd, 1, 0);
4250                         complete(&cmd->transport_lun_fe_stop_comp);
4251                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4252                         continue;
4253                 }
4254                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4255                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
4256
4257                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4258                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4259         }
4260         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4261 }
4262
4263 static int transport_clear_lun_thread(void *p)
4264 {
4265         struct se_lun *lun = p;
4266
4267         __transport_clear_lun_from_sessions(lun);
4268         complete(&lun->lun_shutdown_comp);
4269
4270         return 0;
4271 }
4272
4273 int transport_clear_lun_from_sessions(struct se_lun *lun)
4274 {
4275         struct task_struct *kt;
4276
4277         kt = kthread_run(transport_clear_lun_thread, lun,
4278                         "tcm_cl_%u", lun->unpacked_lun);
4279         if (IS_ERR(kt)) {
4280                 pr_err("Unable to start clear_lun thread\n");
4281                 return PTR_ERR(kt);
4282         }
4283         wait_for_completion(&lun->lun_shutdown_comp);
4284
4285         return 0;
4286 }
4287
4288 /**
4289  * transport_wait_for_tasks - wait for completion to occur
4290  * @cmd:        command to wait
4291  *
4292  * Called from frontend fabric context to wait for storage engine
4293  * to pause and/or release frontend generated struct se_cmd.
4294  */
4295 bool transport_wait_for_tasks(struct se_cmd *cmd)
4296 {
4297         unsigned long flags;
4298
4299         spin_lock_irqsave(&cmd->t_state_lock, flags);
4300         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4301                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4302                 return false;
4303         }
4304         /*
4305          * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4306          * has been set in transport_set_supported_SAM_opcode().
4307          */
4308         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4309                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4310                 return false;
4311         }
4312         /*
4313          * If we are already stopped due to an external event (ie: LUN shutdown)
4314          * sleep until the connection can have the passed struct se_cmd back.
4315          * The cmd->transport_lun_stopped_sem will be upped by
4316          * transport_clear_lun_from_sessions() once the ConfigFS context caller
4317          * has completed its operation on the struct se_cmd.
4318          */
4319         if (atomic_read(&cmd->transport_lun_stop)) {
4320
4321                 pr_debug("wait_for_tasks: Stopping"
4322                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4323                         "_stop_comp); for ITT: 0x%08x\n",
4324                         cmd->se_tfo->get_task_tag(cmd));
4325                 /*
4326                  * There is a special case for WRITES where a FE exception +
4327                  * LUN shutdown means ConfigFS context is still sleeping on
4328                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4329                  * We go ahead and up transport_lun_stop_comp just to be sure
4330                  * here.
4331                  */
4332                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4333                 complete(&cmd->transport_lun_stop_comp);
4334                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4335                 spin_lock_irqsave(&cmd->t_state_lock, flags);
4336
4337                 transport_all_task_dev_remove_state(cmd);
4338                 /*
4339                  * At this point, the frontend who was the originator of this
4340                  * struct se_cmd, now owns the structure and can be released through
4341                  * normal means below.
4342                  */
4343                 pr_debug("wait_for_tasks: Stopped"
4344                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4345                         "stop_comp); for ITT: 0x%08x\n",
4346                         cmd->se_tfo->get_task_tag(cmd));
4347
4348                 atomic_set(&cmd->transport_lun_stop, 0);
4349         }
4350         if (!atomic_read(&cmd->t_transport_active) ||
4351              atomic_read(&cmd->t_transport_aborted)) {
4352                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4353                 return false;
4354         }
4355
4356         atomic_set(&cmd->t_transport_stop, 1);
4357
4358         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4359                 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4360                 cmd, cmd->se_tfo->get_task_tag(cmd),
4361                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4362
4363         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4364
4365         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4366
4367         wait_for_completion(&cmd->t_transport_stop_comp);
4368
4369         spin_lock_irqsave(&cmd->t_state_lock, flags);
4370         atomic_set(&cmd->t_transport_active, 0);
4371         atomic_set(&cmd->t_transport_stop, 0);
4372
4373         pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4374                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4375                 cmd->se_tfo->get_task_tag(cmd));
4376
4377         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4378
4379         return true;
4380 }
4381 EXPORT_SYMBOL(transport_wait_for_tasks);
4382
4383 static int transport_get_sense_codes(
4384         struct se_cmd *cmd,
4385         u8 *asc,
4386         u8 *ascq)
4387 {
4388         *asc = cmd->scsi_asc;
4389         *ascq = cmd->scsi_ascq;
4390
4391         return 0;
4392 }
4393
4394 static int transport_set_sense_codes(
4395         struct se_cmd *cmd,
4396         u8 asc,
4397         u8 ascq)
4398 {
4399         cmd->scsi_asc = asc;
4400         cmd->scsi_ascq = ascq;
4401
4402         return 0;
4403 }
4404
4405 int transport_send_check_condition_and_sense(
4406         struct se_cmd *cmd,
4407         u8 reason,
4408         int from_transport)
4409 {
4410         unsigned char *buffer = cmd->sense_buffer;
4411         unsigned long flags;
4412         int offset;
4413         u8 asc = 0, ascq = 0;
4414
4415         spin_lock_irqsave(&cmd->t_state_lock, flags);
4416         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4417                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4418                 return 0;
4419         }
4420         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4421         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4422
4423         if (!reason && from_transport)
4424                 goto after_reason;
4425
4426         if (!from_transport)
4427                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4428         /*
4429          * Data Segment and SenseLength of the fabric response PDU.
4430          *
4431          * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4432          * from include/scsi/scsi_cmnd.h
4433          */
4434         offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4435                                 TRANSPORT_SENSE_BUFFER);
4436         /*
4437          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
4438          * SENSE KEY values from include/scsi/scsi.h
4439          */
4440         switch (reason) {
4441         case TCM_NON_EXISTENT_LUN:
4442                 /* CURRENT ERROR */
4443                 buffer[offset] = 0x70;
4444                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4445                 /* ILLEGAL REQUEST */
4446                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4447                 /* LOGICAL UNIT NOT SUPPORTED */
4448                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4449                 break;
4450         case TCM_UNSUPPORTED_SCSI_OPCODE:
4451         case TCM_SECTOR_COUNT_TOO_MANY:
4452                 /* CURRENT ERROR */
4453                 buffer[offset] = 0x70;
4454                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4455                 /* ILLEGAL REQUEST */
4456                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4457                 /* INVALID COMMAND OPERATION CODE */
4458                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4459                 break;
4460         case TCM_UNKNOWN_MODE_PAGE:
4461                 /* CURRENT ERROR */
4462                 buffer[offset] = 0x70;
4463                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4464                 /* ILLEGAL REQUEST */
4465                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4466                 /* INVALID FIELD IN CDB */
4467                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4468                 break;
4469         case TCM_CHECK_CONDITION_ABORT_CMD:
4470                 /* CURRENT ERROR */
4471                 buffer[offset] = 0x70;
4472                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4473                 /* ABORTED COMMAND */
4474                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4475                 /* BUS DEVICE RESET FUNCTION OCCURRED */
4476                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4477                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4478                 break;
4479         case TCM_INCORRECT_AMOUNT_OF_DATA:
4480                 /* CURRENT ERROR */
4481                 buffer[offset] = 0x70;
4482                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4483                 /* ABORTED COMMAND */
4484                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4485                 /* WRITE ERROR */
4486                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4487                 /* NOT ENOUGH UNSOLICITED DATA */
4488                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4489                 break;
4490         case TCM_INVALID_CDB_FIELD:
4491                 /* CURRENT ERROR */
4492                 buffer[offset] = 0x70;
4493                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4494                 /* ILLEGAL REQUEST */
4495                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4496                 /* INVALID FIELD IN CDB */
4497                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4498                 break;
4499         case TCM_INVALID_PARAMETER_LIST:
4500                 /* CURRENT ERROR */
4501                 buffer[offset] = 0x70;
4502                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4503                 /* ILLEGAL REQUEST */
4504                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4505                 /* INVALID FIELD IN PARAMETER LIST */
4506                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4507                 break;
4508         case TCM_UNEXPECTED_UNSOLICITED_DATA:
4509                 /* CURRENT ERROR */
4510                 buffer[offset] = 0x70;
4511                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4512                 /* ABORTED COMMAND */
4513                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4514                 /* WRITE ERROR */
4515                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4516                 /* UNEXPECTED_UNSOLICITED_DATA */
4517                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4518                 break;
4519         case TCM_SERVICE_CRC_ERROR:
4520                 /* CURRENT ERROR */
4521                 buffer[offset] = 0x70;
4522                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4523                 /* ABORTED COMMAND */
4524                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4525                 /* PROTOCOL SERVICE CRC ERROR */
4526                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4527                 /* N/A */
4528                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4529                 break;
4530         case TCM_SNACK_REJECTED:
4531                 /* CURRENT ERROR */
4532                 buffer[offset] = 0x70;
4533                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4534                 /* ABORTED COMMAND */
4535                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4536                 /* READ ERROR */
4537                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4538                 /* FAILED RETRANSMISSION REQUEST */
4539                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4540                 break;
4541         case TCM_WRITE_PROTECTED:
4542                 /* CURRENT ERROR */
4543                 buffer[offset] = 0x70;
4544                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4545                 /* DATA PROTECT */
4546                 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4547                 /* WRITE PROTECTED */
4548                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4549                 break;
4550         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4551                 /* CURRENT ERROR */
4552                 buffer[offset] = 0x70;
4553                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4554                 /* UNIT ATTENTION */
4555                 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4556                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4557                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4558                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4559                 break;
4560         case TCM_CHECK_CONDITION_NOT_READY:
4561                 /* CURRENT ERROR */
4562                 buffer[offset] = 0x70;
4563                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4564                 /* Not Ready */
4565                 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4566                 transport_get_sense_codes(cmd, &asc, &ascq);
4567                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4568                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4569                 break;
4570         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4571         default:
4572                 /* CURRENT ERROR */
4573                 buffer[offset] = 0x70;
4574                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4575                 /* ILLEGAL REQUEST */
4576                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4577                 /* LOGICAL UNIT COMMUNICATION FAILURE */
4578                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4579                 break;
4580         }
4581         /*
4582          * This code uses linux/include/scsi/scsi.h SAM status codes!
4583          */
4584         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4585         /*
4586          * Automatically padded, this value is encoded in the fabric's
4587          * data_length response PDU containing the SCSI defined sense data.
4588          */
4589         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
4590
4591 after_reason:
4592         return cmd->se_tfo->queue_status(cmd);
4593 }
4594 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4595
4596 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4597 {
4598         int ret = 0;
4599
4600         if (atomic_read(&cmd->t_transport_aborted) != 0) {
4601                 if (!send_status ||
4602                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4603                         return 1;
4604 #if 0
4605                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4606                         " status for CDB: 0x%02x ITT: 0x%08x\n",
4607                         cmd->t_task_cdb[0],
4608                         cmd->se_tfo->get_task_tag(cmd));
4609 #endif
4610                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4611                 cmd->se_tfo->queue_status(cmd);
4612                 ret = 1;
4613         }
4614         return ret;
4615 }
4616 EXPORT_SYMBOL(transport_check_aborted_status);
4617
4618 void transport_send_task_abort(struct se_cmd *cmd)
4619 {
4620         unsigned long flags;
4621
4622         spin_lock_irqsave(&cmd->t_state_lock, flags);
4623         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4624                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4625                 return;
4626         }
4627         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4628
4629         /*
4630          * If there are still expected incoming fabric WRITEs, we wait
4631          * until until they have completed before sending a TASK_ABORTED
4632          * response.  This response with TASK_ABORTED status will be
4633          * queued back to fabric module by transport_check_aborted_status().
4634          */
4635         if (cmd->data_direction == DMA_TO_DEVICE) {
4636                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4637                         atomic_inc(&cmd->t_transport_aborted);
4638                         smp_mb__after_atomic_inc();
4639                 }
4640         }
4641         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4642 #if 0
4643         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4644                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4645                 cmd->se_tfo->get_task_tag(cmd));
4646 #endif
4647         cmd->se_tfo->queue_status(cmd);
4648 }
4649
4650 static int transport_generic_do_tmr(struct se_cmd *cmd)
4651 {
4652         struct se_device *dev = cmd->se_dev;
4653         struct se_tmr_req *tmr = cmd->se_tmr_req;
4654         int ret;
4655
4656         switch (tmr->function) {
4657         case TMR_ABORT_TASK:
4658                 tmr->response = TMR_FUNCTION_REJECTED;
4659                 break;
4660         case TMR_ABORT_TASK_SET:
4661         case TMR_CLEAR_ACA:
4662         case TMR_CLEAR_TASK_SET:
4663                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4664                 break;
4665         case TMR_LUN_RESET:
4666                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4667                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4668                                          TMR_FUNCTION_REJECTED;
4669                 break;
4670         case TMR_TARGET_WARM_RESET:
4671                 tmr->response = TMR_FUNCTION_REJECTED;
4672                 break;
4673         case TMR_TARGET_COLD_RESET:
4674                 tmr->response = TMR_FUNCTION_REJECTED;
4675                 break;
4676         default:
4677                 pr_err("Uknown TMR function: 0x%02x.\n",
4678                                 tmr->function);
4679                 tmr->response = TMR_FUNCTION_REJECTED;
4680                 break;
4681         }
4682
4683         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4684         cmd->se_tfo->queue_tm_rsp(cmd);
4685
4686         transport_cmd_check_stop_to_fabric(cmd);
4687         return 0;
4688 }
4689
4690 /*      transport_processing_thread():
4691  *
4692  *
4693  */
4694 static int transport_processing_thread(void *param)
4695 {
4696         int ret;
4697         struct se_cmd *cmd;
4698         struct se_device *dev = param;
4699
4700         while (!kthread_should_stop()) {
4701                 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4702                                 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4703                                 kthread_should_stop());
4704                 if (ret < 0)
4705                         goto out;
4706
4707 get_cmd:
4708                 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4709                 if (!cmd)
4710                         continue;
4711
4712                 switch (cmd->t_state) {
4713                 case TRANSPORT_NEW_CMD:
4714                         BUG();
4715                         break;
4716                 case TRANSPORT_NEW_CMD_MAP:
4717                         if (!cmd->se_tfo->new_cmd_map) {
4718                                 pr_err("cmd->se_tfo->new_cmd_map is"
4719                                         " NULL for TRANSPORT_NEW_CMD_MAP\n");
4720                                 BUG();
4721                         }
4722                         ret = cmd->se_tfo->new_cmd_map(cmd);
4723                         if (ret < 0) {
4724                                 transport_generic_request_failure(cmd);
4725                                 break;
4726                         }
4727                         ret = transport_generic_new_cmd(cmd);
4728                         if (ret < 0) {
4729                                 transport_generic_request_failure(cmd);
4730                                 break;
4731                         }
4732                         break;
4733                 case TRANSPORT_PROCESS_WRITE:
4734                         transport_generic_process_write(cmd);
4735                         break;
4736                 case TRANSPORT_PROCESS_TMR:
4737                         transport_generic_do_tmr(cmd);
4738                         break;
4739                 case TRANSPORT_COMPLETE_QF_WP:
4740                         transport_write_pending_qf(cmd);
4741                         break;
4742                 case TRANSPORT_COMPLETE_QF_OK:
4743                         transport_complete_qf(cmd);
4744                         break;
4745                 default:
4746                         pr_err("Unknown t_state: %d  for ITT: 0x%08x "
4747                                 "i_state: %d on SE LUN: %u\n",
4748                                 cmd->t_state,
4749                                 cmd->se_tfo->get_task_tag(cmd),
4750                                 cmd->se_tfo->get_cmd_state(cmd),
4751                                 cmd->se_lun->unpacked_lun);
4752                         BUG();
4753                 }
4754
4755                 goto get_cmd;
4756         }
4757
4758 out:
4759         WARN_ON(!list_empty(&dev->state_task_list));
4760         WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4761         dev->process_thread = NULL;
4762         return 0;
4763 }