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_ua_cache;
  62 struct kmem_cache *t10_pr_reg_cache;
  63 struct kmem_cache *t10_alua_lu_gp_cache;
  64 struct kmem_cache *t10_alua_lu_gp_mem_cache;
  65 struct kmem_cache *t10_alua_tg_pt_gp_cache;
  66 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
  67
  68 static int transport_generic_write_pending(struct se_cmd *);
  69 static int transport_processing_thread(void *param);
  70 static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *);
  71 static void transport_complete_task_attr(struct se_cmd *cmd);
  72 static void transport_handle_queue_full(struct se_cmd *cmd,
  73                 struct se_device *dev);
  74 static void transport_free_dev_tasks(struct se_cmd *cmd);
  75 static int transport_generic_get_mem(struct se_cmd *cmd);
  76 static void transport_put_cmd(struct se_cmd *cmd);
  77 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
  78 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
  79 static void target_complete_ok_work(struct work_struct *work);
  80
  81 int init_se_kmem_caches(void)
  82 {
  83         se_sess_cache = kmem_cache_create("se_sess_cache",
  84                         sizeof(struct se_session), __alignof__(struct se_session),
  85                         0, NULL);
  86         if (!se_sess_cache) {
  87                 pr_err("kmem_cache_create() for struct se_session"
  88                                 " failed\n");
  89                 goto out;
  90         }
  91         se_ua_cache = kmem_cache_create("se_ua_cache",
  92                         sizeof(struct se_ua), __alignof__(struct se_ua),
  93                         0, NULL);
  94         if (!se_ua_cache) {
  95                 pr_err("kmem_cache_create() for struct se_ua failed\n");
  96                 goto out_free_sess_cache;
  97         }
  98         t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
  99                         sizeof(struct t10_pr_registration),
 100                         __alignof__(struct t10_pr_registration), 0, NULL);
 101         if (!t10_pr_reg_cache) {
 102                 pr_err("kmem_cache_create() for struct t10_pr_registration"
 103                                 " failed\n");
 104                 goto out_free_ua_cache;
 105         }
 106         t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
 107                         sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
 108                         0, NULL);
 109         if (!t10_alua_lu_gp_cache) {
 110                 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
 111                                 " failed\n");
 112                 goto out_free_pr_reg_cache;
 113         }
 114         t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
 115                         sizeof(struct t10_alua_lu_gp_member),
 116                         __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
 117         if (!t10_alua_lu_gp_mem_cache) {
 118                 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
 119                                 "cache failed\n");
 120                 goto out_free_lu_gp_cache;
 121         }
 122         t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
 123                         sizeof(struct t10_alua_tg_pt_gp),
 124                         __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
 125         if (!t10_alua_tg_pt_gp_cache) {
 126                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 127                                 "cache failed\n");
 128                 goto out_free_lu_gp_mem_cache;
 129         }
 130         t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
 131                         "t10_alua_tg_pt_gp_mem_cache",
 132                         sizeof(struct t10_alua_tg_pt_gp_member),
 133                         __alignof__(struct t10_alua_tg_pt_gp_member),
 134                         0, NULL);
 135         if (!t10_alua_tg_pt_gp_mem_cache) {
 136                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 137                                 "mem_t failed\n");
 138                 goto out_free_tg_pt_gp_cache;
 139         }
 140
 141         target_completion_wq = alloc_workqueue("target_completion",
 142                                                WQ_MEM_RECLAIM, 0);
 143         if (!target_completion_wq)
 144                 goto out_free_tg_pt_gp_mem_cache;
 145
 146         return 0;
 147
 148 out_free_tg_pt_gp_mem_cache:
 149         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 150 out_free_tg_pt_gp_cache:
 151         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 152 out_free_lu_gp_mem_cache:
 153         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 154 out_free_lu_gp_cache:
 155         kmem_cache_destroy(t10_alua_lu_gp_cache);
 156 out_free_pr_reg_cache:
 157         kmem_cache_destroy(t10_pr_reg_cache);
 158 out_free_ua_cache:
 159         kmem_cache_destroy(se_ua_cache);
 160 out_free_sess_cache:
 161         kmem_cache_destroy(se_sess_cache);
 162 out:
 163         return -ENOMEM;
 164 }
 165
 166 void release_se_kmem_caches(void)
 167 {
 168         destroy_workqueue(target_completion_wq);
 169         kmem_cache_destroy(se_sess_cache);
 170         kmem_cache_destroy(se_ua_cache);
 171         kmem_cache_destroy(t10_pr_reg_cache);
 172         kmem_cache_destroy(t10_alua_lu_gp_cache);
 173         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 174         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 175         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 176 }
 177
 178 /* This code ensures unique mib indexes are handed out. */
 179 static DEFINE_SPINLOCK(scsi_mib_index_lock);
 180 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
 181
 182 /*
 183  * Allocate a new row index for the entry type specified
 184  */
 185 u32 scsi_get_new_index(scsi_index_t type)
 186 {
 187         u32 new_index;
 188
 189         BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
 190
 191         spin_lock(&scsi_mib_index_lock);
 192         new_index = ++scsi_mib_index[type];
 193         spin_unlock(&scsi_mib_index_lock);
 194
 195         return new_index;
 196 }
 197
 198 static void transport_init_queue_obj(struct se_queue_obj *qobj)
 199 {
 200         atomic_set(&qobj->queue_cnt, 0);
 201         INIT_LIST_HEAD(&qobj->qobj_list);
 202         init_waitqueue_head(&qobj->thread_wq);
 203         spin_lock_init(&qobj->cmd_queue_lock);
 204 }
 205
 206 void transport_subsystem_check_init(void)
 207 {
 208         int ret;
 209
 210         if (sub_api_initialized)
 211                 return;
 212
 213         ret = request_module("target_core_iblock");
 214         if (ret != 0)
 215                 pr_err("Unable to load target_core_iblock\n");
 216
 217         ret = request_module("target_core_file");
 218         if (ret != 0)
 219                 pr_err("Unable to load target_core_file\n");
 220
 221         ret = request_module("target_core_pscsi");
 222         if (ret != 0)
 223                 pr_err("Unable to load target_core_pscsi\n");
 224
 225         ret = request_module("target_core_stgt");
 226         if (ret != 0)
 227                 pr_err("Unable to load target_core_stgt\n");
 228
 229         sub_api_initialized = 1;
 230         return;
 231 }
 232
 233 struct se_session *transport_init_session(void)
 234 {
 235         struct se_session *se_sess;
 236
 237         se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
 238         if (!se_sess) {
 239                 pr_err("Unable to allocate struct se_session from"
 240                                 " se_sess_cache\n");
 241                 return ERR_PTR(-ENOMEM);
 242         }
 243         INIT_LIST_HEAD(&se_sess->sess_list);
 244         INIT_LIST_HEAD(&se_sess->sess_acl_list);
 245         INIT_LIST_HEAD(&se_sess->sess_cmd_list);
 246         INIT_LIST_HEAD(&se_sess->sess_wait_list);
 247         spin_lock_init(&se_sess->sess_cmd_lock);
 248
 249         return se_sess;
 250 }
 251 EXPORT_SYMBOL(transport_init_session);
 252
 253 /*
 254  * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
 255  */
 256 void __transport_register_session(
 257         struct se_portal_group *se_tpg,
 258         struct se_node_acl *se_nacl,
 259         struct se_session *se_sess,
 260         void *fabric_sess_ptr)
 261 {
 262         unsigned char buf[PR_REG_ISID_LEN];
 263
 264         se_sess->se_tpg = se_tpg;
 265         se_sess->fabric_sess_ptr = fabric_sess_ptr;
 266         /*
 267          * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
 268          *
 269          * Only set for struct se_session's that will actually be moving I/O.
 270          * eg: *NOT* discovery sessions.
 271          */
 272         if (se_nacl) {
 273                 /*
 274                  * If the fabric module supports an ISID based TransportID,
 275                  * save this value in binary from the fabric I_T Nexus now.
 276                  */
 277                 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
 278                         memset(&buf[0], 0, PR_REG_ISID_LEN);
 279                         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
 280                                         &buf[0], PR_REG_ISID_LEN);
 281                         se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
 282                 }
 283                 spin_lock_irq(&se_nacl->nacl_sess_lock);
 284                 /*
 285                  * The se_nacl->nacl_sess pointer will be set to the
 286                  * last active I_T Nexus for each struct se_node_acl.
 287                  */
 288                 se_nacl->nacl_sess = se_sess;
 289
 290                 list_add_tail(&se_sess->sess_acl_list,
 291                               &se_nacl->acl_sess_list);
 292                 spin_unlock_irq(&se_nacl->nacl_sess_lock);
 293         }
 294         list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
 295
 296         pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
 297                 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
 298 }
 299 EXPORT_SYMBOL(__transport_register_session);
 300
 301 void transport_register_session(
 302         struct se_portal_group *se_tpg,
 303         struct se_node_acl *se_nacl,
 304         struct se_session *se_sess,
 305         void *fabric_sess_ptr)
 306 {
 307         spin_lock_bh(&se_tpg->session_lock);
 308         __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
 309         spin_unlock_bh(&se_tpg->session_lock);
 310 }
 311 EXPORT_SYMBOL(transport_register_session);
 312
 313 void transport_deregister_session_configfs(struct se_session *se_sess)
 314 {
 315         struct se_node_acl *se_nacl;
 316         unsigned long flags;
 317         /*
 318          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
 319          */
 320         se_nacl = se_sess->se_node_acl;
 321         if (se_nacl) {
 322                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
 323                 list_del(&se_sess->sess_acl_list);
 324                 /*
 325                  * If the session list is empty, then clear the pointer.
 326                  * Otherwise, set the struct se_session pointer from the tail
 327                  * element of the per struct se_node_acl active session list.
 328                  */
 329                 if (list_empty(&se_nacl->acl_sess_list))
 330                         se_nacl->nacl_sess = NULL;
 331                 else {
 332                         se_nacl->nacl_sess = container_of(
 333                                         se_nacl->acl_sess_list.prev,
 334                                         struct se_session, sess_acl_list);
 335                 }
 336                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
 337         }
 338 }
 339 EXPORT_SYMBOL(transport_deregister_session_configfs);
 340
 341 void transport_free_session(struct se_session *se_sess)
 342 {
 343         kmem_cache_free(se_sess_cache, se_sess);
 344 }
 345 EXPORT_SYMBOL(transport_free_session);
 346
 347 void transport_deregister_session(struct se_session *se_sess)
 348 {
 349         struct se_portal_group *se_tpg = se_sess->se_tpg;
 350         struct se_node_acl *se_nacl;
 351         unsigned long flags;
 352
 353         if (!se_tpg) {
 354                 transport_free_session(se_sess);
 355                 return;
 356         }
 357
 358         spin_lock_irqsave(&se_tpg->session_lock, flags);
 359         list_del(&se_sess->sess_list);
 360         se_sess->se_tpg = NULL;
 361         se_sess->fabric_sess_ptr = NULL;
 362         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 363
 364         /*
 365          * Determine if we need to do extra work for this initiator node's
 366          * struct se_node_acl if it had been previously dynamically generated.
 367          */
 368         se_nacl = se_sess->se_node_acl;
 369         if (se_nacl) {
 370                 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 371                 if (se_nacl->dynamic_node_acl) {
 372                         if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
 373                                         se_tpg)) {
 374                                 list_del(&se_nacl->acl_list);
 375                                 se_tpg->num_node_acls--;
 376                                 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 377
 378                                 core_tpg_wait_for_nacl_pr_ref(se_nacl);
 379                                 core_free_device_list_for_node(se_nacl, se_tpg);
 380                                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
 381                                                 se_nacl);
 382                                 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 383                         }
 384                 }
 385                 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 386         }
 387
 388         transport_free_session(se_sess);
 389
 390         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
 391                 se_tpg->se_tpg_tfo->get_fabric_name());
 392 }
 393 EXPORT_SYMBOL(transport_deregister_session);
 394
 395 /*
 396  * Called with cmd->t_state_lock held.
 397  */
 398 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
 399 {
 400         struct se_device *dev = cmd->se_dev;
 401         struct se_task *task;
 402         unsigned long flags;
 403
 404         if (!dev)
 405                 return;
 406
 407         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 408                 if (task->task_flags & TF_ACTIVE)
 409                         continue;
 410
 411                 spin_lock_irqsave(&dev->execute_task_lock, flags);
 412                 if (task->t_state_active) {
 413                         pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
 414                                 cmd->se_tfo->get_task_tag(cmd), dev, task);
 415
 416                         list_del(&task->t_state_list);
 417                         atomic_dec(&cmd->t_task_cdbs_ex_left);
 418                         task->t_state_active = false;
 419                 }
 420                 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 421         }
 422
 423 }
 424
 425 /*      transport_cmd_check_stop():
 426  *
 427  *      'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
 428  *      'transport_off = 2' determines if task_dev_state should be removed.
 429  *
 430  *      A non-zero u8 t_state sets cmd->t_state.
 431  *      Returns 1 when command is stopped, else 0.
 432  */
 433 static int transport_cmd_check_stop(
 434         struct se_cmd *cmd,
 435         int transport_off,
 436         u8 t_state)
 437 {
 438         unsigned long flags;
 439
 440         spin_lock_irqsave(&cmd->t_state_lock, flags);
 441         /*
 442          * Determine if IOCTL context caller in requesting the stopping of this
 443          * command for LUN shutdown purposes.
 444          */
 445         if (cmd->transport_state & CMD_T_LUN_STOP) {
 446                 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
 447                         __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
 448
 449                 cmd->transport_state &= ~CMD_T_ACTIVE;
 450                 if (transport_off == 2)
 451                         transport_all_task_dev_remove_state(cmd);
 452                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 453
 454                 complete(&cmd->transport_lun_stop_comp);
 455                 return 1;
 456         }
 457         /*
 458          * Determine if frontend context caller is requesting the stopping of
 459          * this command for frontend exceptions.
 460          */
 461         if (cmd->transport_state & CMD_T_STOP) {
 462                 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
 463                         __func__, __LINE__,
 464                         cmd->se_tfo->get_task_tag(cmd));
 465
 466                 if (transport_off == 2)
 467                         transport_all_task_dev_remove_state(cmd);
 468
 469                 /*
 470                  * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
 471                  * to FE.
 472                  */
 473                 if (transport_off == 2)
 474                         cmd->se_lun = NULL;
 475                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 476
 477                 complete(&cmd->t_transport_stop_comp);
 478                 return 1;
 479         }
 480         if (transport_off) {
 481                 cmd->transport_state &= ~CMD_T_ACTIVE;
 482                 if (transport_off == 2) {
 483                         transport_all_task_dev_remove_state(cmd);
 484                         /*
 485                          * Clear struct se_cmd->se_lun before the transport_off == 2
 486                          * handoff to fabric module.
 487                          */
 488                         cmd->se_lun = NULL;
 489                         /*
 490                          * Some fabric modules like tcm_loop can release
 491                          * their internally allocated I/O reference now and
 492                          * struct se_cmd now.
 493                          *
 494                          * Fabric modules are expected to return '1' here if the
 495                          * se_cmd being passed is released at this point,
 496                          * or zero if not being released.
 497                          */
 498                         if (cmd->se_tfo->check_stop_free != NULL) {
 499                                 spin_unlock_irqrestore(
 500                                         &cmd->t_state_lock, flags);
 501
 502                                 return cmd->se_tfo->check_stop_free(cmd);
 503                         }
 504                 }
 505                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 506
 507                 return 0;
 508         } else if (t_state)
 509                 cmd->t_state = t_state;
 510         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 511
 512         return 0;
 513 }
 514
 515 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 516 {
 517         return transport_cmd_check_stop(cmd, 2, 0);
 518 }
 519
 520 static void transport_lun_remove_cmd(struct se_cmd *cmd)
 521 {
 522         struct se_lun *lun = cmd->se_lun;
 523         unsigned long flags;
 524
 525         if (!lun)
 526                 return;
 527
 528         spin_lock_irqsave(&cmd->t_state_lock, flags);
 529         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
 530                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
 531                 transport_all_task_dev_remove_state(cmd);
 532         }
 533         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 534
 535         spin_lock_irqsave(&lun->lun_cmd_lock, flags);
 536         if (!list_empty(&cmd->se_lun_node))
 537                 list_del_init(&cmd->se_lun_node);
 538         spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
 539 }
 540
 541 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 542 {
 543         if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
 544                 transport_lun_remove_cmd(cmd);
 545
 546         if (transport_cmd_check_stop_to_fabric(cmd))
 547                 return;
 548         if (remove) {
 549                 transport_remove_cmd_from_queue(cmd);
 550                 transport_put_cmd(cmd);
 551         }
 552 }
 553
 554 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
 555                 bool at_head)
 556 {
 557         struct se_device *dev = cmd->se_dev;
 558         struct se_queue_obj *qobj = &dev->dev_queue_obj;
 559         unsigned long flags;
 560
 561         if (t_state) {
 562                 spin_lock_irqsave(&cmd->t_state_lock, flags);
 563                 cmd->t_state = t_state;
 564                 cmd->transport_state |= CMD_T_ACTIVE;
 565                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 566         }
 567
 568         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 569
 570         /* If the cmd is already on the list, remove it before we add it */
 571         if (!list_empty(&cmd->se_queue_node))
 572                 list_del(&cmd->se_queue_node);
 573         else
 574                 atomic_inc(&qobj->queue_cnt);
 575
 576         if (at_head)
 577                 list_add(&cmd->se_queue_node, &qobj->qobj_list);
 578         else
 579                 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
 580         cmd->transport_state |= CMD_T_QUEUED;
 581         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 582
 583         wake_up_interruptible(&qobj->thread_wq);
 584 }
 585
 586 static struct se_cmd *
 587 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
 588 {
 589         struct se_cmd *cmd;
 590         unsigned long flags;
 591
 592         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 593         if (list_empty(&qobj->qobj_list)) {
 594                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 595                 return NULL;
 596         }
 597         cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
 598
 599         cmd->transport_state &= ~CMD_T_QUEUED;
 600         list_del_init(&cmd->se_queue_node);
 601         atomic_dec(&qobj->queue_cnt);
 602         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 603
 604         return cmd;
 605 }
 606
 607 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
 608 {
 609         struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
 610         unsigned long flags;
 611
 612         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 613         if (!(cmd->transport_state & CMD_T_QUEUED)) {
 614                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 615                 return;
 616         }
 617         cmd->transport_state &= ~CMD_T_QUEUED;
 618         atomic_dec(&qobj->queue_cnt);
 619         list_del_init(&cmd->se_queue_node);
 620         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 621 }
 622
 623 /*
 624  * Completion function used by TCM subsystem plugins (such as FILEIO)
 625  * for queueing up response from struct se_subsystem_api->do_task()
 626  */
 627 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
 628 {
 629         struct se_task *task = list_entry(cmd->t_task_list.next,
 630                                 struct se_task, t_list);
 631
 632         if (good) {
 633                 cmd->scsi_status = SAM_STAT_GOOD;
 634                 task->task_scsi_status = GOOD;
 635         } else {
 636                 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
 637                 task->task_se_cmd->scsi_sense_reason =
 638                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 639
 640         }
 641
 642         transport_complete_task(task, good);
 643 }
 644 EXPORT_SYMBOL(transport_complete_sync_cache);
 645
 646 static void target_complete_failure_work(struct work_struct *work)
 647 {
 648         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
 649
 650         transport_generic_request_failure(cmd);
 651 }
 652
 653 /*      transport_complete_task():
 654  *
 655  *      Called from interrupt and non interrupt context depending
 656  *      on the transport plugin.
 657  */
 658 void transport_complete_task(struct se_task *task, int success)
 659 {
 660         struct se_cmd *cmd = task->task_se_cmd;
 661         struct se_device *dev = cmd->se_dev;
 662         unsigned long flags;
 663
 664         spin_lock_irqsave(&cmd->t_state_lock, flags);
 665         task->task_flags &= ~TF_ACTIVE;
 666
 667         /*
 668          * See if any sense data exists, if so set the TASK_SENSE flag.
 669          * Also check for any other post completion work that needs to be
 670          * done by the plugins.
 671          */
 672         if (dev && dev->transport->transport_complete) {
 673                 if (dev->transport->transport_complete(task) != 0) {
 674                         cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 675                         task->task_flags |= TF_HAS_SENSE;
 676                         success = 1;
 677                 }
 678         }
 679
 680         /*
 681          * See if we are waiting for outstanding struct se_task
 682          * to complete for an exception condition
 683          */
 684         if (task->task_flags & TF_REQUEST_STOP) {
 685                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 686                 complete(&task->task_stop_comp);
 687                 return;
 688         }
 689
 690         if (!success)
 691                 cmd->transport_state |= CMD_T_FAILED;
 692
 693         /*
 694          * Decrement the outstanding t_task_cdbs_left count.  The last
 695          * struct se_task from struct se_cmd will complete itself into the
 696          * device queue depending upon int success.
 697          */
 698         if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
 699                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 700                 return;
 701         }
 702
 703         if (cmd->transport_state & CMD_T_FAILED) {
 704                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 705                 INIT_WORK(&cmd->work, target_complete_failure_work);
 706         } else {
 707                 cmd->transport_state |= CMD_T_COMPLETE;
 708                 INIT_WORK(&cmd->work, target_complete_ok_work);
 709         }
 710
 711         cmd->t_state = TRANSPORT_COMPLETE;
 712         cmd->transport_state |= CMD_T_ACTIVE;
 713         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 714
 715         queue_work(target_completion_wq, &cmd->work);
 716 }
 717 EXPORT_SYMBOL(transport_complete_task);
 718
 719 /*
 720  * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
 721  * struct se_task list are ready to be added to the active execution list
 722  * struct se_device
 723
 724  * Called with se_dev_t->execute_task_lock called.
 725  */
 726 static inline int transport_add_task_check_sam_attr(
 727         struct se_task *task,
 728         struct se_task *task_prev,
 729         struct se_device *dev)
 730 {
 731         /*
 732          * No SAM Task attribute emulation enabled, add to tail of
 733          * execution queue
 734          */
 735         if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
 736                 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
 737                 return 0;
 738         }
 739         /*
 740          * HEAD_OF_QUEUE attribute for received CDB, which means
 741          * the first task that is associated with a struct se_cmd goes to
 742          * head of the struct se_device->execute_task_list, and task_prev
 743          * after that for each subsequent task
 744          */
 745         if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
 746                 list_add(&task->t_execute_list,
 747                                 (task_prev != NULL) ?
 748                                 &task_prev->t_execute_list :
 749                                 &dev->execute_task_list);
 750
 751                 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
 752                                 " in execution queue\n",
 753                                 task->task_se_cmd->t_task_cdb[0]);
 754                 return 1;
 755         }
 756         /*
 757          * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
 758          * transitioned from Dermant -> Active state, and are added to the end
 759          * of the struct se_device->execute_task_list
 760          */
 761         list_add_tail(&task->t_execute_list, &dev->execute_task_list);
 762         return 0;
 763 }
 764
 765 /*      __transport_add_task_to_execute_queue():
 766  *
 767  *      Called with se_dev_t->execute_task_lock called.
 768  */
 769 static void __transport_add_task_to_execute_queue(
 770         struct se_task *task,
 771         struct se_task *task_prev,
 772         struct se_device *dev)
 773 {
 774         int head_of_queue;
 775
 776         head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
 777         atomic_inc(&dev->execute_tasks);
 778
 779         if (task->t_state_active)
 780                 return;
 781         /*
 782          * Determine if this task needs to go to HEAD_OF_QUEUE for the
 783          * state list as well.  Running with SAM Task Attribute emulation
 784          * will always return head_of_queue == 0 here
 785          */
 786         if (head_of_queue)
 787                 list_add(&task->t_state_list, (task_prev) ?
 788                                 &task_prev->t_state_list :
 789                                 &dev->state_task_list);
 790         else
 791                 list_add_tail(&task->t_state_list, &dev->state_task_list);
 792
 793         task->t_state_active = true;
 794
 795         pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
 796                 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
 797                 task, dev);
 798 }
 799
 800 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
 801 {
 802         struct se_device *dev = cmd->se_dev;
 803         struct se_task *task;
 804         unsigned long flags;
 805
 806         spin_lock_irqsave(&cmd->t_state_lock, flags);
 807         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 808                 spin_lock(&dev->execute_task_lock);
 809                 if (!task->t_state_active) {
 810                         list_add_tail(&task->t_state_list,
 811                                       &dev->state_task_list);
 812                         task->t_state_active = true;
 813
 814                         pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
 815                                 task->task_se_cmd->se_tfo->get_task_tag(
 816                                 task->task_se_cmd), task, dev);
 817                 }
 818                 spin_unlock(&dev->execute_task_lock);
 819         }
 820         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 821 }
 822
 823 static void __transport_add_tasks_from_cmd(struct se_cmd *cmd)
 824 {
 825         struct se_device *dev = cmd->se_dev;
 826         struct se_task *task, *task_prev = NULL;
 827
 828         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 829                 if (!list_empty(&task->t_execute_list))
 830                         continue;
 831                 /*
 832                  * __transport_add_task_to_execute_queue() handles the
 833                  * SAM Task Attribute emulation if enabled
 834                  */
 835                 __transport_add_task_to_execute_queue(task, task_prev, dev);
 836                 task_prev = task;
 837         }
 838 }
 839
 840 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
 841 {
 842         unsigned long flags;
 843         struct se_device *dev = cmd->se_dev;
 844
 845         spin_lock_irqsave(&dev->execute_task_lock, flags);
 846         __transport_add_tasks_from_cmd(cmd);
 847         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 848 }
 849
 850 void __transport_remove_task_from_execute_queue(struct se_task *task,
 851                 struct se_device *dev)
 852 {
 853         list_del_init(&task->t_execute_list);
 854         atomic_dec(&dev->execute_tasks);
 855 }
 856
 857 static void transport_remove_task_from_execute_queue(
 858         struct se_task *task,
 859         struct se_device *dev)
 860 {
 861         unsigned long flags;
 862
 863         if (WARN_ON(list_empty(&task->t_execute_list)))
 864                 return;
 865
 866         spin_lock_irqsave(&dev->execute_task_lock, flags);
 867         __transport_remove_task_from_execute_queue(task, dev);
 868         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 869 }
 870
 871 /*
 872  * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
 873  */
 874
 875 static void target_qf_do_work(struct work_struct *work)
 876 {
 877         struct se_device *dev = container_of(work, struct se_device,
 878                                         qf_work_queue);
 879         LIST_HEAD(qf_cmd_list);
 880         struct se_cmd *cmd, *cmd_tmp;
 881
 882         spin_lock_irq(&dev->qf_cmd_lock);
 883         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 884         spin_unlock_irq(&dev->qf_cmd_lock);
 885
 886         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 887                 list_del(&cmd->se_qf_node);
 888                 atomic_dec(&dev->dev_qf_count);
 889                 smp_mb__after_atomic_dec();
 890
 891                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 892                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 893                         (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 894                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 895                         : "UNKNOWN");
 896
 897                 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
 898         }
 899 }
 900
 901 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 902 {
 903         switch (cmd->data_direction) {
 904         case DMA_NONE:
 905                 return "NONE";
 906         case DMA_FROM_DEVICE:
 907                 return "READ";
 908         case DMA_TO_DEVICE:
 909                 return "WRITE";
 910         case DMA_BIDIRECTIONAL:
 911                 return "BIDI";
 912         default:
 913                 break;
 914         }
 915
 916         return "UNKNOWN";
 917 }
 918
 919 void transport_dump_dev_state(
 920         struct se_device *dev,
 921         char *b,
 922         int *bl)
 923 {
 924         *bl += sprintf(b + *bl, "Status: ");
 925         switch (dev->dev_status) {
 926         case TRANSPORT_DEVICE_ACTIVATED:
 927                 *bl += sprintf(b + *bl, "ACTIVATED");
 928                 break;
 929         case TRANSPORT_DEVICE_DEACTIVATED:
 930                 *bl += sprintf(b + *bl, "DEACTIVATED");
 931                 break;
 932         case TRANSPORT_DEVICE_SHUTDOWN:
 933                 *bl += sprintf(b + *bl, "SHUTDOWN");
 934                 break;
 935         case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
 936         case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
 937                 *bl += sprintf(b + *bl, "OFFLINE");
 938                 break;
 939         default:
 940                 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
 941                 break;
 942         }
 943
 944         *bl += sprintf(b + *bl, "  Execute/Max Queue Depth: %d/%d",
 945                 atomic_read(&dev->execute_tasks), dev->queue_depth);
 946         *bl += sprintf(b + *bl, "  SectorSize: %u  MaxSectors: %u\n",
 947                 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
 948         *bl += sprintf(b + *bl, "        ");
 949 }
 950
 951 void transport_dump_vpd_proto_id(
 952         struct t10_vpd *vpd,
 953         unsigned char *p_buf,
 954         int p_buf_len)
 955 {
 956         unsigned char buf[VPD_TMP_BUF_SIZE];
 957         int len;
 958
 959         memset(buf, 0, VPD_TMP_BUF_SIZE);
 960         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
 961
 962         switch (vpd->protocol_identifier) {
 963         case 0x00:
 964                 sprintf(buf+len, "Fibre Channel\n");
 965                 break;
 966         case 0x10:
 967                 sprintf(buf+len, "Parallel SCSI\n");
 968                 break;
 969         case 0x20:
 970                 sprintf(buf+len, "SSA\n");
 971                 break;
 972         case 0x30:
 973                 sprintf(buf+len, "IEEE 1394\n");
 974                 break;
 975         case 0x40:
 976                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
 977                                 " Protocol\n");
 978                 break;
 979         case 0x50:
 980                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
 981                 break;
 982         case 0x60:
 983                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
 984                 break;
 985         case 0x70:
 986                 sprintf(buf+len, "Automation/Drive Interface Transport"
 987                                 " Protocol\n");
 988                 break;
 989         case 0x80:
 990                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
 991                 break;
 992         default:
 993                 sprintf(buf+len, "Unknown 0x%02x\n",
 994                                 vpd->protocol_identifier);
 995                 break;
 996         }
 997
 998         if (p_buf)
 999                 strncpy(p_buf, buf, p_buf_len);
1000         else
1001                 pr_debug("%s", buf);
1002 }
1003
1004 void
1005 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1006 {
1007         /*
1008          * Check if the Protocol Identifier Valid (PIV) bit is set..
1009          *
1010          * from spc3r23.pdf section 7.5.1
1011          */
1012          if (page_83[1] & 0x80) {
1013                 vpd->protocol_identifier = (page_83[0] & 0xf0);
1014                 vpd->protocol_identifier_set = 1;
1015                 transport_dump_vpd_proto_id(vpd, NULL, 0);
1016         }
1017 }
1018 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1019
1020 int transport_dump_vpd_assoc(
1021         struct t10_vpd *vpd,
1022         unsigned char *p_buf,
1023         int p_buf_len)
1024 {
1025         unsigned char buf[VPD_TMP_BUF_SIZE];
1026         int ret = 0;
1027         int len;
1028
1029         memset(buf, 0, VPD_TMP_BUF_SIZE);
1030         len = sprintf(buf, "T10 VPD Identifier Association: ");
1031
1032         switch (vpd->association) {
1033         case 0x00:
1034                 sprintf(buf+len, "addressed logical unit\n");
1035                 break;
1036         case 0x10:
1037                 sprintf(buf+len, "target port\n");
1038                 break;
1039         case 0x20:
1040                 sprintf(buf+len, "SCSI target device\n");
1041                 break;
1042         default:
1043                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1044                 ret = -EINVAL;
1045                 break;
1046         }
1047
1048         if (p_buf)
1049                 strncpy(p_buf, buf, p_buf_len);
1050         else
1051                 pr_debug("%s", buf);
1052
1053         return ret;
1054 }
1055
1056 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1057 {
1058         /*
1059          * The VPD identification association..
1060          *
1061          * from spc3r23.pdf Section 7.6.3.1 Table 297
1062          */
1063         vpd->association = (page_83[1] & 0x30);
1064         return transport_dump_vpd_assoc(vpd, NULL, 0);
1065 }
1066 EXPORT_SYMBOL(transport_set_vpd_assoc);
1067
1068 int transport_dump_vpd_ident_type(
1069         struct t10_vpd *vpd,
1070         unsigned char *p_buf,
1071         int p_buf_len)
1072 {
1073         unsigned char buf[VPD_TMP_BUF_SIZE];
1074         int ret = 0;
1075         int len;
1076
1077         memset(buf, 0, VPD_TMP_BUF_SIZE);
1078         len = sprintf(buf, "T10 VPD Identifier Type: ");
1079
1080         switch (vpd->device_identifier_type) {
1081         case 0x00:
1082                 sprintf(buf+len, "Vendor specific\n");
1083                 break;
1084         case 0x01:
1085                 sprintf(buf+len, "T10 Vendor ID based\n");
1086                 break;
1087         case 0x02:
1088                 sprintf(buf+len, "EUI-64 based\n");
1089                 break;
1090         case 0x03:
1091                 sprintf(buf+len, "NAA\n");
1092                 break;
1093         case 0x04:
1094                 sprintf(buf+len, "Relative target port identifier\n");
1095                 break;
1096         case 0x08:
1097                 sprintf(buf+len, "SCSI name string\n");
1098                 break;
1099         default:
1100                 sprintf(buf+len, "Unsupported: 0x%02x\n",
1101                                 vpd->device_identifier_type);
1102                 ret = -EINVAL;
1103                 break;
1104         }
1105
1106         if (p_buf) {
1107                 if (p_buf_len < strlen(buf)+1)
1108                         return -EINVAL;
1109                 strncpy(p_buf, buf, p_buf_len);
1110         } else {
1111                 pr_debug("%s", buf);
1112         }
1113
1114         return ret;
1115 }
1116
1117 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1118 {
1119         /*
1120          * The VPD identifier type..
1121          *
1122          * from spc3r23.pdf Section 7.6.3.1 Table 298
1123          */
1124         vpd->device_identifier_type = (page_83[1] & 0x0f);
1125         return transport_dump_vpd_ident_type(vpd, NULL, 0);
1126 }
1127 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1128
1129 int transport_dump_vpd_ident(
1130         struct t10_vpd *vpd,
1131         unsigned char *p_buf,
1132         int p_buf_len)
1133 {
1134         unsigned char buf[VPD_TMP_BUF_SIZE];
1135         int ret = 0;
1136
1137         memset(buf, 0, VPD_TMP_BUF_SIZE);
1138
1139         switch (vpd->device_identifier_code_set) {
1140         case 0x01: /* Binary */
1141                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1142                         &vpd->device_identifier[0]);
1143                 break;
1144         case 0x02: /* ASCII */
1145                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1146                         &vpd->device_identifier[0]);
1147                 break;
1148         case 0x03: /* UTF-8 */
1149                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1150                         &vpd->device_identifier[0]);
1151                 break;
1152         default:
1153                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1154                         " 0x%02x", vpd->device_identifier_code_set);
1155                 ret = -EINVAL;
1156                 break;
1157         }
1158
1159         if (p_buf)
1160                 strncpy(p_buf, buf, p_buf_len);
1161         else
1162                 pr_debug("%s", buf);
1163
1164         return ret;
1165 }
1166
1167 int
1168 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1169 {
1170         static const char hex_str[] = "0123456789abcdef";
1171         int j = 0, i = 4; /* offset to start of the identifer */
1172
1173         /*
1174          * The VPD Code Set (encoding)
1175          *
1176          * from spc3r23.pdf Section 7.6.3.1 Table 296
1177          */
1178         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1179         switch (vpd->device_identifier_code_set) {
1180         case 0x01: /* Binary */
1181                 vpd->device_identifier[j++] =
1182                                 hex_str[vpd->device_identifier_type];
1183                 while (i < (4 + page_83[3])) {
1184                         vpd->device_identifier[j++] =
1185                                 hex_str[(page_83[i] & 0xf0) >> 4];
1186                         vpd->device_identifier[j++] =
1187                                 hex_str[page_83[i] & 0x0f];
1188                         i++;
1189                 }
1190                 break;
1191         case 0x02: /* ASCII */
1192         case 0x03: /* UTF-8 */
1193                 while (i < (4 + page_83[3]))
1194                         vpd->device_identifier[j++] = page_83[i++];
1195                 break;
1196         default:
1197                 break;
1198         }
1199
1200         return transport_dump_vpd_ident(vpd, NULL, 0);
1201 }
1202 EXPORT_SYMBOL(transport_set_vpd_ident);
1203
1204 static void core_setup_task_attr_emulation(struct se_device *dev)
1205 {
1206         /*
1207          * If this device is from Target_Core_Mod/pSCSI, disable the
1208          * SAM Task Attribute emulation.
1209          *
1210          * This is currently not available in upsream Linux/SCSI Target
1211          * mode code, and is assumed to be disabled while using TCM/pSCSI.
1212          */
1213         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1214                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1215                 return;
1216         }
1217
1218         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1219         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1220                 " device\n", dev->transport->name,
1221                 dev->transport->get_device_rev(dev));
1222 }
1223
1224 static void scsi_dump_inquiry(struct se_device *dev)
1225 {
1226         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1227         char buf[17];
1228         int i, device_type;
1229         /*
1230          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1231          */
1232         for (i = 0; i < 8; i++)
1233                 if (wwn->vendor[i] >= 0x20)
1234                         buf[i] = wwn->vendor[i];
1235                 else
1236                         buf[i] = ' ';
1237         buf[i] = '\0';
1238         pr_debug("  Vendor: %s\n", buf);
1239
1240         for (i = 0; i < 16; i++)
1241                 if (wwn->model[i] >= 0x20)
1242                         buf[i] = wwn->model[i];
1243                 else
1244                         buf[i] = ' ';
1245         buf[i] = '\0';
1246         pr_debug("  Model: %s\n", buf);
1247
1248         for (i = 0; i < 4; i++)
1249                 if (wwn->revision[i] >= 0x20)
1250                         buf[i] = wwn->revision[i];
1251                 else
1252                         buf[i] = ' ';
1253         buf[i] = '\0';
1254         pr_debug("  Revision: %s\n", buf);
1255
1256         device_type = dev->transport->get_device_type(dev);
1257         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1258         pr_debug("                 ANSI SCSI revision: %02x\n",
1259                                 dev->transport->get_device_rev(dev));
1260 }
1261
1262 struct se_device *transport_add_device_to_core_hba(
1263         struct se_hba *hba,
1264         struct se_subsystem_api *transport,
1265         struct se_subsystem_dev *se_dev,
1266         u32 device_flags,
1267         void *transport_dev,
1268         struct se_dev_limits *dev_limits,
1269         const char *inquiry_prod,
1270         const char *inquiry_rev)
1271 {
1272         int force_pt;
1273         struct se_device  *dev;
1274
1275         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1276         if (!dev) {
1277                 pr_err("Unable to allocate memory for se_dev_t\n");
1278                 return NULL;
1279         }
1280
1281         transport_init_queue_obj(&dev->dev_queue_obj);
1282         dev->dev_flags          = device_flags;
1283         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1284         dev->dev_ptr            = transport_dev;
1285         dev->se_hba             = hba;
1286         dev->se_sub_dev         = se_dev;
1287         dev->transport          = transport;
1288         INIT_LIST_HEAD(&dev->dev_list);
1289         INIT_LIST_HEAD(&dev->dev_sep_list);
1290         INIT_LIST_HEAD(&dev->dev_tmr_list);
1291         INIT_LIST_HEAD(&dev->execute_task_list);
1292         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1293         INIT_LIST_HEAD(&dev->state_task_list);
1294         INIT_LIST_HEAD(&dev->qf_cmd_list);
1295         spin_lock_init(&dev->execute_task_lock);
1296         spin_lock_init(&dev->delayed_cmd_lock);
1297         spin_lock_init(&dev->dev_reservation_lock);
1298         spin_lock_init(&dev->dev_status_lock);
1299         spin_lock_init(&dev->se_port_lock);
1300         spin_lock_init(&dev->se_tmr_lock);
1301         spin_lock_init(&dev->qf_cmd_lock);
1302         atomic_set(&dev->dev_ordered_id, 0);
1303
1304         se_dev_set_default_attribs(dev, dev_limits);
1305
1306         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1307         dev->creation_time = get_jiffies_64();
1308         spin_lock_init(&dev->stats_lock);
1309
1310         spin_lock(&hba->device_lock);
1311         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1312         hba->dev_count++;
1313         spin_unlock(&hba->device_lock);
1314         /*
1315          * Setup the SAM Task Attribute emulation for struct se_device
1316          */
1317         core_setup_task_attr_emulation(dev);
1318         /*
1319          * Force PR and ALUA passthrough emulation with internal object use.
1320          */
1321         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1322         /*
1323          * Setup the Reservations infrastructure for struct se_device
1324          */
1325         core_setup_reservations(dev, force_pt);
1326         /*
1327          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1328          */
1329         if (core_setup_alua(dev, force_pt) < 0)
1330                 goto out;
1331
1332         /*
1333          * Startup the struct se_device processing thread
1334          */
1335         dev->process_thread = kthread_run(transport_processing_thread, dev,
1336                                           "LIO_%s", dev->transport->name);
1337         if (IS_ERR(dev->process_thread)) {
1338                 pr_err("Unable to create kthread: LIO_%s\n",
1339                         dev->transport->name);
1340                 goto out;
1341         }
1342         /*
1343          * Setup work_queue for QUEUE_FULL
1344          */
1345         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1346         /*
1347          * Preload the initial INQUIRY const values if we are doing
1348          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1349          * passthrough because this is being provided by the backend LLD.
1350          * This is required so that transport_get_inquiry() copies these
1351          * originals once back into DEV_T10_WWN(dev) for the virtual device
1352          * setup.
1353          */
1354         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1355                 if (!inquiry_prod || !inquiry_rev) {
1356                         pr_err("All non TCM/pSCSI plugins require"
1357                                 " INQUIRY consts\n");
1358                         goto out;
1359                 }
1360
1361                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1362                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1363                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1364         }
1365         scsi_dump_inquiry(dev);
1366
1367         return dev;
1368 out:
1369         kthread_stop(dev->process_thread);
1370
1371         spin_lock(&hba->device_lock);
1372         list_del(&dev->dev_list);
1373         hba->dev_count--;
1374         spin_unlock(&hba->device_lock);
1375
1376         se_release_vpd_for_dev(dev);
1377
1378         kfree(dev);
1379
1380         return NULL;
1381 }
1382 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1383
1384 /*      transport_generic_prepare_cdb():
1385  *
1386  *      Since the Initiator sees iSCSI devices as LUNs,  the SCSI CDB will
1387  *      contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1388  *      The point of this is since we are mapping iSCSI LUNs to
1389  *      SCSI Target IDs having a non-zero LUN in the CDB will throw the
1390  *      devices and HBAs for a loop.
1391  */
1392 static inline void transport_generic_prepare_cdb(
1393         unsigned char *cdb)
1394 {
1395         switch (cdb[0]) {
1396         case READ_10: /* SBC - RDProtect */
1397         case READ_12: /* SBC - RDProtect */
1398         case READ_16: /* SBC - RDProtect */
1399         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1400         case VERIFY: /* SBC - VRProtect */
1401         case VERIFY_16: /* SBC - VRProtect */
1402         case WRITE_VERIFY: /* SBC - VRProtect */
1403         case WRITE_VERIFY_12: /* SBC - VRProtect */
1404                 break;
1405         default:
1406                 cdb[1] &= 0x1f; /* clear logical unit number */
1407                 break;
1408         }
1409 }
1410
1411 static struct se_task *
1412 transport_generic_get_task(struct se_cmd *cmd,
1413                 enum dma_data_direction data_direction)
1414 {
1415         struct se_task *task;
1416         struct se_device *dev = cmd->se_dev;
1417
1418         task = dev->transport->alloc_task(cmd->t_task_cdb);
1419         if (!task) {
1420                 pr_err("Unable to allocate struct se_task\n");
1421                 return NULL;
1422         }
1423
1424         INIT_LIST_HEAD(&task->t_list);
1425         INIT_LIST_HEAD(&task->t_execute_list);
1426         INIT_LIST_HEAD(&task->t_state_list);
1427         init_completion(&task->task_stop_comp);
1428         task->task_se_cmd = cmd;
1429         task->task_data_direction = data_direction;
1430
1431         return task;
1432 }
1433
1434 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1435
1436 /*
1437  * Used by fabric modules containing a local struct se_cmd within their
1438  * fabric dependent per I/O descriptor.
1439  */
1440 void transport_init_se_cmd(
1441         struct se_cmd *cmd,
1442         struct target_core_fabric_ops *tfo,
1443         struct se_session *se_sess,
1444         u32 data_length,
1445         int data_direction,
1446         int task_attr,
1447         unsigned char *sense_buffer)
1448 {
1449         INIT_LIST_HEAD(&cmd->se_lun_node);
1450         INIT_LIST_HEAD(&cmd->se_delayed_node);
1451         INIT_LIST_HEAD(&cmd->se_qf_node);
1452         INIT_LIST_HEAD(&cmd->se_queue_node);
1453         INIT_LIST_HEAD(&cmd->se_cmd_list);
1454         INIT_LIST_HEAD(&cmd->t_task_list);
1455         init_completion(&cmd->transport_lun_fe_stop_comp);
1456         init_completion(&cmd->transport_lun_stop_comp);
1457         init_completion(&cmd->t_transport_stop_comp);
1458         init_completion(&cmd->cmd_wait_comp);
1459         spin_lock_init(&cmd->t_state_lock);
1460         cmd->transport_state = CMD_T_DEV_ACTIVE;
1461
1462         cmd->se_tfo = tfo;
1463         cmd->se_sess = se_sess;
1464         cmd->data_length = data_length;
1465         cmd->data_direction = data_direction;
1466         cmd->sam_task_attr = task_attr;
1467         cmd->sense_buffer = sense_buffer;
1468 }
1469 EXPORT_SYMBOL(transport_init_se_cmd);
1470
1471 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1472 {
1473         /*
1474          * Check if SAM Task Attribute emulation is enabled for this
1475          * struct se_device storage object
1476          */
1477         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1478                 return 0;
1479
1480         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1481                 pr_debug("SAM Task Attribute ACA"
1482                         " emulation is not supported\n");
1483                 return -EINVAL;
1484         }
1485         /*
1486          * Used to determine when ORDERED commands should go from
1487          * Dormant to Active status.
1488          */
1489         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1490         smp_mb__after_atomic_inc();
1491         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1492                         cmd->se_ordered_id, cmd->sam_task_attr,
1493                         cmd->se_dev->transport->name);
1494         return 0;
1495 }
1496
1497 /*      transport_generic_allocate_tasks():
1498  *
1499  *      Called from fabric RX Thread.
1500  */
1501 int transport_generic_allocate_tasks(
1502         struct se_cmd *cmd,
1503         unsigned char *cdb)
1504 {
1505         int ret;
1506
1507         transport_generic_prepare_cdb(cdb);
1508         /*
1509          * Ensure that the received CDB is less than the max (252 + 8) bytes
1510          * for VARIABLE_LENGTH_CMD
1511          */
1512         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1513                 pr_err("Received SCSI CDB with command_size: %d that"
1514                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1515                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1516                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1517                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1518                 return -EINVAL;
1519         }
1520         /*
1521          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1522          * allocate the additional extended CDB buffer now..  Otherwise
1523          * setup the pointer from __t_task_cdb to t_task_cdb.
1524          */
1525         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1526                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1527                                                 GFP_KERNEL);
1528                 if (!cmd->t_task_cdb) {
1529                         pr_err("Unable to allocate cmd->t_task_cdb"
1530                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1531                                 scsi_command_size(cdb),
1532                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1533                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1534                         cmd->scsi_sense_reason =
1535                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1536                         return -ENOMEM;
1537                 }
1538         } else
1539                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1540         /*
1541          * Copy the original CDB into cmd->
1542          */
1543         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1544         /*
1545          * Setup the received CDB based on SCSI defined opcodes and
1546          * perform unit attention, persistent reservations and ALUA
1547          * checks for virtual device backends.  The cmd->t_task_cdb
1548          * pointer is expected to be setup before we reach this point.
1549          */
1550         ret = transport_generic_cmd_sequencer(cmd, cdb);
1551         if (ret < 0)
1552                 return ret;
1553         /*
1554          * Check for SAM Task Attribute Emulation
1555          */
1556         if (transport_check_alloc_task_attr(cmd) < 0) {
1557                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1558                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1559                 return -EINVAL;
1560         }
1561         spin_lock(&cmd->se_lun->lun_sep_lock);
1562         if (cmd->se_lun->lun_sep)
1563                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1564         spin_unlock(&cmd->se_lun->lun_sep_lock);
1565         return 0;
1566 }
1567 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1568
1569 /*
1570  * Used by fabric module frontends to queue tasks directly.
1571  * Many only be used from process context only
1572  */
1573 int transport_handle_cdb_direct(
1574         struct se_cmd *cmd)
1575 {
1576         int ret;
1577
1578         if (!cmd->se_lun) {
1579                 dump_stack();
1580                 pr_err("cmd->se_lun is NULL\n");
1581                 return -EINVAL;
1582         }
1583         if (in_interrupt()) {
1584                 dump_stack();
1585                 pr_err("transport_generic_handle_cdb cannot be called"
1586                                 " from interrupt context\n");
1587                 return -EINVAL;
1588         }
1589         /*
1590          * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
1591          * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1592          * in existing usage to ensure that outstanding descriptors are handled
1593          * correctly during shutdown via transport_wait_for_tasks()
1594          *
1595          * Also, we don't take cmd->t_state_lock here as we only expect
1596          * this to be called for initial descriptor submission.
1597          */
1598         cmd->t_state = TRANSPORT_NEW_CMD;
1599         cmd->transport_state |= CMD_T_ACTIVE;
1600
1601         /*
1602          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1603          * so follow TRANSPORT_NEW_CMD processing thread context usage
1604          * and call transport_generic_request_failure() if necessary..
1605          */
1606         ret = transport_generic_new_cmd(cmd);
1607         if (ret < 0)
1608                 transport_generic_request_failure(cmd);
1609
1610         return 0;
1611 }
1612 EXPORT_SYMBOL(transport_handle_cdb_direct);
1613
1614 /**
1615  * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1616  *
1617  * @se_cmd: command descriptor to submit
1618  * @se_sess: associated se_sess for endpoint
1619  * @cdb: pointer to SCSI CDB
1620  * @sense: pointer to SCSI sense buffer
1621  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1622  * @data_length: fabric expected data transfer length
1623  * @task_addr: SAM task attribute
1624  * @data_dir: DMA data direction
1625  * @flags: flags for command submission from target_sc_flags_tables
1626  *
1627  * This may only be called from process context, and also currently
1628  * assumes internal allocation of fabric payload buffer by target-core.
1629  **/
1630 void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1631                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1632                 u32 data_length, int task_attr, int data_dir, int flags)
1633 {
1634         struct se_portal_group *se_tpg;
1635         int rc;
1636
1637         se_tpg = se_sess->se_tpg;
1638         BUG_ON(!se_tpg);
1639         BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1640         BUG_ON(in_interrupt());
1641         /*
1642          * Initialize se_cmd for target operation.  From this point
1643          * exceptions are handled by sending exception status via
1644          * target_core_fabric_ops->queue_status() callback
1645          */
1646         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1647                                 data_length, data_dir, task_attr, sense);
1648         /*
1649          * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1650          * se_sess->sess_cmd_list.  A second kref_get here is necessary
1651          * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1652          * kref_put() to happen during fabric packet acknowledgement.
1653          */
1654         target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1655         /*
1656          * Signal bidirectional data payloads to target-core
1657          */
1658         if (flags & TARGET_SCF_BIDI_OP)
1659                 se_cmd->se_cmd_flags |= SCF_BIDI;
1660         /*
1661          * Locate se_lun pointer and attach it to struct se_cmd
1662          */
1663         if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1664                 transport_send_check_condition_and_sense(se_cmd,
1665                                 se_cmd->scsi_sense_reason, 0);
1666                 target_put_sess_cmd(se_sess, se_cmd);
1667                 return;
1668         }
1669         /*
1670          * Sanitize CDBs via transport_generic_cmd_sequencer() and
1671          * allocate the necessary tasks to complete the received CDB+data
1672          */
1673         rc = transport_generic_allocate_tasks(se_cmd, cdb);
1674         if (rc != 0) {
1675                 transport_generic_request_failure(se_cmd);
1676                 return;
1677         }
1678         /*
1679          * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1680          * for immediate execution of READs, otherwise wait for
1681          * transport_generic_handle_data() to be called for WRITEs
1682          * when fabric has filled the incoming buffer.
1683          */
1684         transport_handle_cdb_direct(se_cmd);
1685         return;
1686 }
1687 EXPORT_SYMBOL(target_submit_cmd);
1688
1689 /**
1690  * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1691  *                     for TMR CDBs
1692  *
1693  * @se_cmd: command descriptor to submit
1694  * @se_sess: associated se_sess for endpoint
1695  * @sense: pointer to SCSI sense buffer
1696  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1697  * @fabric_context: fabric context for TMR req
1698  * @tm_type: Type of TM request
1699  *
1700  * Callable from all contexts.
1701  **/
1702
1703 void target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1704                 unsigned char *sense, u32 unpacked_lun,
1705                 void *fabric_tmr_ptr, unsigned char tm_type, int flags)
1706 {
1707         struct se_portal_group *se_tpg;
1708         int ret;
1709
1710         se_tpg = se_sess->se_tpg;
1711         BUG_ON(!se_tpg);
1712
1713         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1714                               0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1715
1716         /* See target_submit_cmd for commentary */
1717         target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1718
1719         ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, GFP_KERNEL);
1720         if (ret < 0) {
1721                 dump_stack();
1722                 /* FIXME XXX */
1723                 return;
1724         }
1725
1726         ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1727         if (ret) {
1728                 transport_send_check_condition_and_sense(se_cmd,
1729                         se_cmd->scsi_sense_reason, 0);
1730                 transport_generic_free_cmd(se_cmd, 0);
1731                 return;
1732         }
1733         transport_generic_handle_tmr(se_cmd);
1734 }
1735 EXPORT_SYMBOL(target_submit_tmr);
1736
1737 /*
1738  * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1739  * to  queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1740  * complete setup in TCM process context w/ TFO->new_cmd_map().
1741  */
1742 int transport_generic_handle_cdb_map(
1743         struct se_cmd *cmd)
1744 {
1745         if (!cmd->se_lun) {
1746                 dump_stack();
1747                 pr_err("cmd->se_lun is NULL\n");
1748                 return -EINVAL;
1749         }
1750
1751         transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1752         return 0;
1753 }
1754 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1755
1756 /*      transport_generic_handle_data():
1757  *
1758  *
1759  */
1760 int transport_generic_handle_data(
1761         struct se_cmd *cmd)
1762 {
1763         /*
1764          * For the software fabric case, then we assume the nexus is being
1765          * failed/shutdown when signals are pending from the kthread context
1766          * caller, so we return a failure.  For the HW target mode case running
1767          * in interrupt code, the signal_pending() check is skipped.
1768          */
1769         if (!in_interrupt() && signal_pending(current))
1770                 return -EPERM;
1771         /*
1772          * If the received CDB has aleady been ABORTED by the generic
1773          * target engine, we now call transport_check_aborted_status()
1774          * to queue any delated TASK_ABORTED status for the received CDB to the
1775          * fabric module as we are expecting no further incoming DATA OUT
1776          * sequences at this point.
1777          */
1778         if (transport_check_aborted_status(cmd, 1) != 0)
1779                 return 0;
1780
1781         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1782         return 0;
1783 }
1784 EXPORT_SYMBOL(transport_generic_handle_data);
1785
1786 /*      transport_generic_handle_tmr():
1787  *
1788  *
1789  */
1790 int transport_generic_handle_tmr(
1791         struct se_cmd *cmd)
1792 {
1793         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1794         return 0;
1795 }
1796 EXPORT_SYMBOL(transport_generic_handle_tmr);
1797
1798 /*
1799  * If the task is active, request it to be stopped and sleep until it
1800  * has completed.
1801  */
1802 bool target_stop_task(struct se_task *task, unsigned long *flags)
1803 {
1804         struct se_cmd *cmd = task->task_se_cmd;
1805         bool was_active = false;
1806
1807         if (task->task_flags & TF_ACTIVE) {
1808                 task->task_flags |= TF_REQUEST_STOP;
1809                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1810
1811                 pr_debug("Task %p waiting to complete\n", task);
1812                 wait_for_completion(&task->task_stop_comp);
1813                 pr_debug("Task %p stopped successfully\n", task);
1814
1815                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1816                 atomic_dec(&cmd->t_task_cdbs_left);
1817                 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1818                 was_active = true;
1819         }
1820
1821         return was_active;
1822 }
1823
1824 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1825 {
1826         struct se_task *task, *task_tmp;
1827         unsigned long flags;
1828         int ret = 0;
1829
1830         pr_debug("ITT[0x%08x] - Stopping tasks\n",
1831                 cmd->se_tfo->get_task_tag(cmd));
1832
1833         /*
1834          * No tasks remain in the execution queue
1835          */
1836         spin_lock_irqsave(&cmd->t_state_lock, flags);
1837         list_for_each_entry_safe(task, task_tmp,
1838                                 &cmd->t_task_list, t_list) {
1839                 pr_debug("Processing task %p\n", task);
1840                 /*
1841                  * If the struct se_task has not been sent and is not active,
1842                  * remove the struct se_task from the execution queue.
1843                  */
1844                 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
1845                         spin_unlock_irqrestore(&cmd->t_state_lock,
1846                                         flags);
1847                         transport_remove_task_from_execute_queue(task,
1848                                         cmd->se_dev);
1849
1850                         pr_debug("Task %p removed from execute queue\n", task);
1851                         spin_lock_irqsave(&cmd->t_state_lock, flags);
1852                         continue;
1853                 }
1854
1855                 if (!target_stop_task(task, &flags)) {
1856                         pr_debug("Task %p - did nothing\n", task);
1857                         ret++;
1858                 }
1859         }
1860         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1861
1862         return ret;
1863 }
1864
1865 /*
1866  * Handle SAM-esque emulation for generic transport request failures.
1867  */
1868 void transport_generic_request_failure(struct se_cmd *cmd)
1869 {
1870         int ret = 0;
1871
1872         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1873                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1874                 cmd->t_task_cdb[0]);
1875         pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1876                 cmd->se_tfo->get_cmd_state(cmd),
1877                 cmd->t_state, cmd->scsi_sense_reason);
1878         pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1879                 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1880                 " CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1881                 cmd->t_task_list_num,
1882                 atomic_read(&cmd->t_task_cdbs_left),
1883                 atomic_read(&cmd->t_task_cdbs_sent),
1884                 atomic_read(&cmd->t_task_cdbs_ex_left),
1885                 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1886                 (cmd->transport_state & CMD_T_STOP) != 0,
1887                 (cmd->transport_state & CMD_T_SENT) != 0);
1888
1889         /*
1890          * For SAM Task Attribute emulation for failed struct se_cmd
1891          */
1892         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1893                 transport_complete_task_attr(cmd);
1894
1895         switch (cmd->scsi_sense_reason) {
1896         case TCM_NON_EXISTENT_LUN:
1897         case TCM_UNSUPPORTED_SCSI_OPCODE:
1898         case TCM_INVALID_CDB_FIELD:
1899         case TCM_INVALID_PARAMETER_LIST:
1900         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1901         case TCM_UNKNOWN_MODE_PAGE:
1902         case TCM_WRITE_PROTECTED:
1903         case TCM_CHECK_CONDITION_ABORT_CMD:
1904         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1905         case TCM_CHECK_CONDITION_NOT_READY:
1906                 break;
1907         case TCM_RESERVATION_CONFLICT:
1908                 /*
1909                  * No SENSE Data payload for this case, set SCSI Status
1910                  * and queue the response to $FABRIC_MOD.
1911                  *
1912                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1913                  */
1914                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1915                 /*
1916                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1917                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1918                  * CONFLICT STATUS.
1919                  *
1920                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1921                  */
1922                 if (cmd->se_sess &&
1923                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1924                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1925                                 cmd->orig_fe_lun, 0x2C,
1926                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1927
1928                 ret = cmd->se_tfo->queue_status(cmd);
1929                 if (ret == -EAGAIN || ret == -ENOMEM)
1930                         goto queue_full;
1931                 goto check_stop;
1932         default:
1933                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1934                         cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1935                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1936                 break;
1937         }
1938         /*
1939          * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1940          * make the call to transport_send_check_condition_and_sense()
1941          * directly.  Otherwise expect the fabric to make the call to
1942          * transport_send_check_condition_and_sense() after handling
1943          * possible unsoliticied write data payloads.
1944          */
1945         ret = transport_send_check_condition_and_sense(cmd,
1946                         cmd->scsi_sense_reason, 0);
1947         if (ret == -EAGAIN || ret == -ENOMEM)
1948                 goto queue_full;
1949
1950 check_stop:
1951         transport_lun_remove_cmd(cmd);
1952         if (!transport_cmd_check_stop_to_fabric(cmd))
1953                 ;
1954         return;
1955
1956 queue_full:
1957         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1958         transport_handle_queue_full(cmd, cmd->se_dev);
1959 }
1960 EXPORT_SYMBOL(transport_generic_request_failure);
1961
1962 static inline u32 transport_lba_21(unsigned char *cdb)
1963 {
1964         return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1965 }
1966
1967 static inline u32 transport_lba_32(unsigned char *cdb)
1968 {
1969         return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1970 }
1971
1972 static inline unsigned long long transport_lba_64(unsigned char *cdb)
1973 {
1974         unsigned int __v1, __v2;
1975
1976         __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1977         __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1978
1979         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1980 }
1981
1982 /*
1983  * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1984  */
1985 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1986 {
1987         unsigned int __v1, __v2;
1988
1989         __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1990         __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1991
1992         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1993 }
1994
1995 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1996 {
1997         unsigned long flags;
1998
1999         spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2000         se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
2001         spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2002 }
2003
2004 /*
2005  * Called from Fabric Module context from transport_execute_tasks()
2006  *
2007  * The return of this function determins if the tasks from struct se_cmd
2008  * get added to the execution queue in transport_execute_tasks(),
2009  * or are added to the delayed or ordered lists here.
2010  */
2011 static inline int transport_execute_task_attr(struct se_cmd *cmd)
2012 {
2013         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
2014                 return 1;
2015         /*
2016          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2017          * to allow the passed struct se_cmd list of tasks to the front of the list.
2018          */
2019          if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2020                 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2021                         " 0x%02x, se_ordered_id: %u\n",
2022                         cmd->t_task_cdb[0],
2023                         cmd->se_ordered_id);
2024                 return 1;
2025         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2026                 atomic_inc(&cmd->se_dev->dev_ordered_sync);
2027                 smp_mb__after_atomic_inc();
2028
2029                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2030                                 " list, se_ordered_id: %u\n",
2031                                 cmd->t_task_cdb[0],
2032                                 cmd->se_ordered_id);
2033                 /*
2034                  * Add ORDERED command to tail of execution queue if
2035                  * no other older commands exist that need to be
2036                  * completed first.
2037                  */
2038                 if (!atomic_read(&cmd->se_dev->simple_cmds))
2039                         return 1;
2040         } else {
2041                 /*
2042                  * For SIMPLE and UNTAGGED Task Attribute commands
2043                  */
2044                 atomic_inc(&cmd->se_dev->simple_cmds);
2045                 smp_mb__after_atomic_inc();
2046         }
2047         /*
2048          * Otherwise if one or more outstanding ORDERED task attribute exist,
2049          * add the dormant task(s) built for the passed struct se_cmd to the
2050          * execution queue and become in Active state for this struct se_device.
2051          */
2052         if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
2053                 /*
2054                  * Otherwise, add cmd w/ tasks to delayed cmd queue that
2055                  * will be drained upon completion of HEAD_OF_QUEUE task.
2056                  */
2057                 spin_lock(&cmd->se_dev->delayed_cmd_lock);
2058                 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2059                 list_add_tail(&cmd->se_delayed_node,
2060                                 &cmd->se_dev->delayed_cmd_list);
2061                 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
2062
2063                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2064                         " delayed CMD list, se_ordered_id: %u\n",
2065                         cmd->t_task_cdb[0], cmd->sam_task_attr,
2066                         cmd->se_ordered_id);
2067                 /*
2068                  * Return zero to let transport_execute_tasks() know
2069                  * not to add the delayed tasks to the execution list.
2070                  */
2071                 return 0;
2072         }
2073         /*
2074          * Otherwise, no ORDERED task attributes exist..
2075          */
2076         return 1;
2077 }
2078
2079 /*
2080  * Called from fabric module context in transport_generic_new_cmd() and
2081  * transport_generic_process_write()
2082  */
2083 static int transport_execute_tasks(struct se_cmd *cmd)
2084 {
2085         int add_tasks;
2086         struct se_device *se_dev = cmd->se_dev;
2087         /*
2088          * Call transport_cmd_check_stop() to see if a fabric exception
2089          * has occurred that prevents execution.
2090          */
2091         if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2092                 /*
2093                  * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2094                  * attribute for the tasks of the received struct se_cmd CDB
2095                  */
2096                 add_tasks = transport_execute_task_attr(cmd);
2097                 if (!add_tasks)
2098                         goto execute_tasks;
2099                 /*
2100                  * __transport_execute_tasks() -> __transport_add_tasks_from_cmd()
2101                  * adds associated se_tasks while holding dev->execute_task_lock
2102                  * before I/O dispath to avoid a double spinlock access.
2103                  */
2104                 __transport_execute_tasks(se_dev, cmd);
2105                 return 0;
2106         }
2107
2108 execute_tasks:
2109         __transport_execute_tasks(se_dev, NULL);
2110         return 0;
2111 }
2112
2113 /*
2114  * Called to check struct se_device tcq depth window, and once open pull struct se_task
2115  * from struct se_device->execute_task_list and
2116  *
2117  * Called from transport_processing_thread()
2118  */
2119 static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
2120 {
2121         int error;
2122         struct se_cmd *cmd = NULL;
2123         struct se_task *task = NULL;
2124         unsigned long flags;
2125
2126 check_depth:
2127         spin_lock_irq(&dev->execute_task_lock);
2128         if (new_cmd != NULL)
2129                 __transport_add_tasks_from_cmd(new_cmd);
2130
2131         if (list_empty(&dev->execute_task_list)) {
2132                 spin_unlock_irq(&dev->execute_task_lock);
2133                 return 0;
2134         }
2135         task = list_first_entry(&dev->execute_task_list,
2136                                 struct se_task, t_execute_list);
2137         __transport_remove_task_from_execute_queue(task, dev);
2138         spin_unlock_irq(&dev->execute_task_lock);
2139
2140         cmd = task->task_se_cmd;
2141         spin_lock_irqsave(&cmd->t_state_lock, flags);
2142         task->task_flags |= (TF_ACTIVE | TF_SENT);
2143         atomic_inc(&cmd->t_task_cdbs_sent);
2144
2145         if (atomic_read(&cmd->t_task_cdbs_sent) ==
2146             cmd->t_task_list_num)
2147                 cmd->transport_state |= CMD_T_SENT;
2148
2149         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2150
2151         if (cmd->execute_task)
2152                 error = cmd->execute_task(task);
2153         else
2154                 error = dev->transport->do_task(task);
2155         if (error != 0) {
2156                 spin_lock_irqsave(&cmd->t_state_lock, flags);
2157                 task->task_flags &= ~TF_ACTIVE;
2158                 cmd->transport_state &= ~CMD_T_SENT;
2159                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2160
2161                 transport_stop_tasks_for_cmd(cmd);
2162                 transport_generic_request_failure(cmd);
2163         }
2164
2165         new_cmd = NULL;
2166         goto check_depth;
2167
2168         return 0;
2169 }
2170
2171 static inline u32 transport_get_sectors_6(
2172         unsigned char *cdb,
2173         struct se_cmd *cmd,
2174         int *ret)
2175 {
2176         struct se_device *dev = cmd->se_dev;
2177
2178         /*
2179          * Assume TYPE_DISK for non struct se_device objects.
2180          * Use 8-bit sector value.
2181          */
2182         if (!dev)
2183                 goto type_disk;
2184
2185         /*
2186          * Use 24-bit allocation length for TYPE_TAPE.
2187          */
2188         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2189                 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2190
2191         /*
2192          * Everything else assume TYPE_DISK Sector CDB location.
2193          * Use 8-bit sector value.  SBC-3 says:
2194          *
2195          *   A TRANSFER LENGTH field set to zero specifies that 256
2196          *   logical blocks shall be written.  Any other value
2197          *   specifies the number of logical blocks that shall be
2198          *   written.
2199          */
2200 type_disk:
2201         return cdb[4] ? : 256;
2202 }
2203
2204 static inline u32 transport_get_sectors_10(
2205         unsigned char *cdb,
2206         struct se_cmd *cmd,
2207         int *ret)
2208 {
2209         struct se_device *dev = cmd->se_dev;
2210
2211         /*
2212          * Assume TYPE_DISK for non struct se_device objects.
2213          * Use 16-bit sector value.
2214          */
2215         if (!dev)
2216                 goto type_disk;
2217
2218         /*
2219          * XXX_10 is not defined in SSC, throw an exception
2220          */
2221         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2222                 *ret = -EINVAL;
2223                 return 0;
2224         }
2225
2226         /*
2227          * Everything else assume TYPE_DISK Sector CDB location.
2228          * Use 16-bit sector value.
2229          */
2230 type_disk:
2231         return (u32)(cdb[7] << 8) + cdb[8];
2232 }
2233
2234 static inline u32 transport_get_sectors_12(
2235         unsigned char *cdb,
2236         struct se_cmd *cmd,
2237         int *ret)
2238 {
2239         struct se_device *dev = cmd->se_dev;
2240
2241         /*
2242          * Assume TYPE_DISK for non struct se_device objects.
2243          * Use 32-bit sector value.
2244          */
2245         if (!dev)
2246                 goto type_disk;
2247
2248         /*
2249          * XXX_12 is not defined in SSC, throw an exception
2250          */
2251         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2252                 *ret = -EINVAL;
2253                 return 0;
2254         }
2255
2256         /*
2257          * Everything else assume TYPE_DISK Sector CDB location.
2258          * Use 32-bit sector value.
2259          */
2260 type_disk:
2261         return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2262 }
2263
2264 static inline u32 transport_get_sectors_16(
2265         unsigned char *cdb,
2266         struct se_cmd *cmd,
2267         int *ret)
2268 {
2269         struct se_device *dev = cmd->se_dev;
2270
2271         /*
2272          * Assume TYPE_DISK for non struct se_device objects.
2273          * Use 32-bit sector value.
2274          */
2275         if (!dev)
2276                 goto type_disk;
2277
2278         /*
2279          * Use 24-bit allocation length for TYPE_TAPE.
2280          */
2281         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2282                 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2283
2284 type_disk:
2285         return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2286                     (cdb[12] << 8) + cdb[13];
2287 }
2288
2289 /*
2290  * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2291  */
2292 static inline u32 transport_get_sectors_32(
2293         unsigned char *cdb,
2294         struct se_cmd *cmd,
2295         int *ret)
2296 {
2297         /*
2298          * Assume TYPE_DISK for non struct se_device objects.
2299          * Use 32-bit sector value.
2300          */
2301         return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2302                     (cdb[30] << 8) + cdb[31];
2303
2304 }
2305
2306 static inline u32 transport_get_size(
2307         u32 sectors,
2308         unsigned char *cdb,
2309         struct se_cmd *cmd)
2310 {
2311         struct se_device *dev = cmd->se_dev;
2312
2313         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2314                 if (cdb[1] & 1) { /* sectors */
2315                         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2316                 } else /* bytes */
2317                         return sectors;
2318         }
2319 #if 0
2320         pr_debug("Returning block_size: %u, sectors: %u == %u for"
2321                         " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2322                         dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2323                         dev->transport->name);
2324 #endif
2325         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2326 }
2327
2328 static void transport_xor_callback(struct se_cmd *cmd)
2329 {
2330         unsigned char *buf, *addr;
2331         struct scatterlist *sg;
2332         unsigned int offset;
2333         int i;
2334         int count;
2335         /*
2336          * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2337          *
2338          * 1) read the specified logical block(s);
2339          * 2) transfer logical blocks from the data-out buffer;
2340          * 3) XOR the logical blocks transferred from the data-out buffer with
2341          *    the logical blocks read, storing the resulting XOR data in a buffer;
2342          * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2343          *    blocks transferred from the data-out buffer; and
2344          * 5) transfer the resulting XOR data to the data-in buffer.
2345          */
2346         buf = kmalloc(cmd->data_length, GFP_KERNEL);
2347         if (!buf) {
2348                 pr_err("Unable to allocate xor_callback buf\n");
2349                 return;
2350         }
2351         /*
2352          * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2353          * into the locally allocated *buf
2354          */
2355         sg_copy_to_buffer(cmd->t_data_sg,
2356                           cmd->t_data_nents,
2357                           buf,
2358                           cmd->data_length);
2359
2360         /*
2361          * Now perform the XOR against the BIDI read memory located at
2362          * cmd->t_mem_bidi_list
2363          */
2364
2365         offset = 0;
2366         for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2367                 addr = kmap_atomic(sg_page(sg), KM_USER0);
2368                 if (!addr)
2369                         goto out;
2370
2371                 for (i = 0; i < sg->length; i++)
2372                         *(addr + sg->offset + i) ^= *(buf + offset + i);
2373
2374                 offset += sg->length;
2375                 kunmap_atomic(addr, KM_USER0);
2376         }
2377
2378 out:
2379         kfree(buf);
2380 }
2381
2382 /*
2383  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2384  */
2385 static int transport_get_sense_data(struct se_cmd *cmd)
2386 {
2387         unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2388         struct se_device *dev = cmd->se_dev;
2389         struct se_task *task = NULL, *task_tmp;
2390         unsigned long flags;
2391         u32 offset = 0;
2392
2393         WARN_ON(!cmd->se_lun);
2394
2395         if (!dev)
2396                 return 0;
2397
2398         spin_lock_irqsave(&cmd->t_state_lock, flags);
2399         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2400                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2401                 return 0;
2402         }
2403
2404         list_for_each_entry_safe(task, task_tmp,
2405                                 &cmd->t_task_list, t_list) {
2406                 if (!(task->task_flags & TF_HAS_SENSE))
2407                         continue;
2408
2409                 if (!dev->transport->get_sense_buffer) {
2410                         pr_err("dev->transport->get_sense_buffer"
2411                                         " is NULL\n");
2412                         continue;
2413                 }
2414
2415                 sense_buffer = dev->transport->get_sense_buffer(task);
2416                 if (!sense_buffer) {
2417                         pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2418                                 " sense buffer for task with sense\n",
2419                                 cmd->se_tfo->get_task_tag(cmd), task);
2420                         continue;
2421                 }
2422                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2423
2424                 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2425                                 TRANSPORT_SENSE_BUFFER);
2426
2427                 memcpy(&buffer[offset], sense_buffer,
2428                                 TRANSPORT_SENSE_BUFFER);
2429                 cmd->scsi_status = task->task_scsi_status;
2430                 /* Automatically padded */
2431                 cmd->scsi_sense_length =
2432                                 (TRANSPORT_SENSE_BUFFER + offset);
2433
2434                 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2435                                 " and sense\n",
2436                         dev->se_hba->hba_id, dev->transport->name,
2437                                 cmd->scsi_status);
2438                 return 0;
2439         }
2440         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2441
2442         return -1;
2443 }
2444
2445 static inline long long transport_dev_end_lba(struct se_device *dev)
2446 {
2447         return dev->transport->get_blocks(dev) + 1;
2448 }
2449
2450 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2451 {
2452         struct se_device *dev = cmd->se_dev;
2453         u32 sectors;
2454
2455         if (dev->transport->get_device_type(dev) != TYPE_DISK)
2456                 return 0;
2457
2458         sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2459
2460         if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2461                 pr_err("LBA: %llu Sectors: %u exceeds"
2462                         " transport_dev_end_lba(): %llu\n",
2463                         cmd->t_task_lba, sectors,
2464                         transport_dev_end_lba(dev));
2465                 return -EINVAL;
2466         }
2467
2468         return 0;
2469 }
2470
2471 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2472 {
2473         /*
2474          * Determine if the received WRITE_SAME is used to for direct
2475          * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2476          * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2477          * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2478          */
2479         int passthrough = (dev->transport->transport_type ==
2480                                 TRANSPORT_PLUGIN_PHBA_PDEV);
2481
2482         if (!passthrough) {
2483                 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2484                         pr_err("WRITE_SAME PBDATA and LBDATA"
2485                                 " bits not supported for Block Discard"
2486                                 " Emulation\n");
2487                         return -ENOSYS;
2488                 }
2489                 /*
2490                  * Currently for the emulated case we only accept
2491                  * tpws with the UNMAP=1 bit set.
2492                  */
2493                 if (!(flags[0] & 0x08)) {
2494                         pr_err("WRITE_SAME w/o UNMAP bit not"
2495                                 " supported for Block Discard Emulation\n");
2496                         return -ENOSYS;
2497                 }
2498         }
2499
2500         return 0;
2501 }
2502
2503 /*      transport_generic_cmd_sequencer():
2504  *
2505  *      Generic Command Sequencer that should work for most DAS transport
2506  *      drivers.
2507  *
2508  *      Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2509  *      RX Thread.
2510  *
2511  *      FIXME: Need to support other SCSI OPCODES where as well.
2512  */
2513 static int transport_generic_cmd_sequencer(
2514         struct se_cmd *cmd,
2515         unsigned char *cdb)
2516 {
2517         struct se_device *dev = cmd->se_dev;
2518         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2519         int ret = 0, sector_ret = 0, passthrough;
2520         u32 sectors = 0, size = 0, pr_reg_type = 0;
2521         u16 service_action;
2522         u8 alua_ascq = 0;
2523         /*
2524          * Check for an existing UNIT ATTENTION condition
2525          */
2526         if (core_scsi3_ua_check(cmd, cdb) < 0) {
2527                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2528                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2529                 return -EINVAL;
2530         }
2531         /*
2532          * Check status of Asymmetric Logical Unit Assignment port
2533          */
2534         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2535         if (ret != 0) {
2536                 /*
2537                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2538                  * The ALUA additional sense code qualifier (ASCQ) is determined
2539                  * by the ALUA primary or secondary access state..
2540                  */
2541                 if (ret > 0) {
2542 #if 0
2543                         pr_debug("[%s]: ALUA TG Port not available,"
2544                                 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2545                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
2546 #endif
2547                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
2548                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2549                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2550                         return -EINVAL;
2551                 }
2552                 goto out_invalid_cdb_field;
2553         }
2554         /*
2555          * Check status for SPC-3 Persistent Reservations
2556          */
2557         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2558                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2559                                         cmd, cdb, pr_reg_type) != 0) {
2560                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2561                         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2562                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2563                         return -EBUSY;
2564                 }
2565                 /*
2566                  * This means the CDB is allowed for the SCSI Initiator port
2567                  * when said port is *NOT* holding the legacy SPC-2 or
2568                  * SPC-3 Persistent Reservation.
2569                  */
2570         }
2571
2572         /*
2573          * If we operate in passthrough mode we skip most CDB emulation and
2574          * instead hand the commands down to the physical SCSI device.
2575          */
2576         passthrough =
2577                 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2578
2579         switch (cdb[0]) {
2580         case READ_6:
2581                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2582                 if (sector_ret)
2583                         goto out_unsupported_cdb;
2584                 size = transport_get_size(sectors, cdb, cmd);
2585                 cmd->t_task_lba = transport_lba_21(cdb);
2586                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2587                 break;
2588         case READ_10:
2589                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2590                 if (sector_ret)
2591                         goto out_unsupported_cdb;
2592                 size = transport_get_size(sectors, cdb, cmd);
2593                 cmd->t_task_lba = transport_lba_32(cdb);
2594                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2595                 break;
2596         case READ_12:
2597                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2598                 if (sector_ret)
2599                         goto out_unsupported_cdb;
2600                 size = transport_get_size(sectors, cdb, cmd);
2601                 cmd->t_task_lba = transport_lba_32(cdb);
2602                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2603                 break;
2604         case READ_16:
2605                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2606                 if (sector_ret)
2607                         goto out_unsupported_cdb;
2608                 size = transport_get_size(sectors, cdb, cmd);
2609                 cmd->t_task_lba = transport_lba_64(cdb);
2610                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2611                 break;
2612         case WRITE_6:
2613                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2614                 if (sector_ret)
2615                         goto out_unsupported_cdb;
2616                 size = transport_get_size(sectors, cdb, cmd);
2617                 cmd->t_task_lba = transport_lba_21(cdb);
2618                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2619                 break;
2620         case WRITE_10:
2621                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2622                 if (sector_ret)
2623                         goto out_unsupported_cdb;
2624                 size = transport_get_size(sectors, cdb, cmd);
2625                 cmd->t_task_lba = transport_lba_32(cdb);
2626                 if (cdb[1] & 0x8)
2627                         cmd->se_cmd_flags |= SCF_FUA;
2628                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2629                 break;
2630         case WRITE_12:
2631                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2632                 if (sector_ret)
2633                         goto out_unsupported_cdb;
2634                 size = transport_get_size(sectors, cdb, cmd);
2635                 cmd->t_task_lba = transport_lba_32(cdb);
2636                 if (cdb[1] & 0x8)
2637                         cmd->se_cmd_flags |= SCF_FUA;
2638                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2639                 break;
2640         case WRITE_16:
2641                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2642                 if (sector_ret)
2643                         goto out_unsupported_cdb;
2644                 size = transport_get_size(sectors, cdb, cmd);
2645                 cmd->t_task_lba = transport_lba_64(cdb);
2646                 if (cdb[1] & 0x8)
2647                         cmd->se_cmd_flags |= SCF_FUA;
2648                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2649                 break;
2650         case XDWRITEREAD_10:
2651                 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2652                     !(cmd->se_cmd_flags & SCF_BIDI))
2653                         goto out_invalid_cdb_field;
2654                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2655                 if (sector_ret)
2656                         goto out_unsupported_cdb;
2657                 size = transport_get_size(sectors, cdb, cmd);
2658                 cmd->t_task_lba = transport_lba_32(cdb);
2659                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2660
2661                 /*
2662                  * Do now allow BIDI commands for passthrough mode.
2663                  */
2664                 if (passthrough)
2665                         goto out_unsupported_cdb;
2666
2667                 /*
2668                  * Setup BIDI XOR callback to be run after I/O completion.
2669                  */
2670                 cmd->transport_complete_callback = &transport_xor_callback;
2671                 if (cdb[1] & 0x8)
2672                         cmd->se_cmd_flags |= SCF_FUA;
2673                 break;
2674         case VARIABLE_LENGTH_CMD:
2675                 service_action = get_unaligned_be16(&cdb[8]);
2676                 switch (service_action) {
2677                 case XDWRITEREAD_32:
2678                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2679                         if (sector_ret)
2680                                 goto out_unsupported_cdb;
2681                         size = transport_get_size(sectors, cdb, cmd);
2682                         /*
2683                          * Use WRITE_32 and READ_32 opcodes for the emulated
2684                          * XDWRITE_READ_32 logic.
2685                          */
2686                         cmd->t_task_lba = transport_lba_64_ext(cdb);
2687                         cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2688
2689                         /*
2690                          * Do now allow BIDI commands for passthrough mode.
2691                          */
2692                         if (passthrough)
2693                                 goto out_unsupported_cdb;
2694
2695                         /*
2696                          * Setup BIDI XOR callback to be run during after I/O
2697                          * completion.
2698                          */
2699                         cmd->transport_complete_callback = &transport_xor_callback;
2700                         if (cdb[1] & 0x8)
2701                                 cmd->se_cmd_flags |= SCF_FUA;
2702                         break;
2703                 case WRITE_SAME_32:
2704                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2705                         if (sector_ret)
2706                                 goto out_unsupported_cdb;
2707
2708                         if (sectors)
2709                                 size = transport_get_size(1, cdb, cmd);
2710                         else {
2711                                 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2712                                        " supported\n");
2713                                 goto out_invalid_cdb_field;
2714                         }
2715
2716                         cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2717                         cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2718
2719                         if (target_check_write_same_discard(&cdb[10], dev) < 0)
2720                                 goto out_unsupported_cdb;
2721                         if (!passthrough)
2722                                 cmd->execute_task = target_emulate_write_same;
2723                         break;
2724                 default:
2725                         pr_err("VARIABLE_LENGTH_CMD service action"
2726                                 " 0x%04x not supported\n", service_action);
2727                         goto out_unsupported_cdb;
2728                 }
2729                 break;
2730         case MAINTENANCE_IN:
2731                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2732                         /* MAINTENANCE_IN from SCC-2 */
2733                         /*
2734                          * Check for emulated MI_REPORT_TARGET_PGS.
2735                          */
2736                         if (cdb[1] == MI_REPORT_TARGET_PGS &&
2737                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2738                                 cmd->execute_task =
2739                                         target_emulate_report_target_port_groups;
2740                         }
2741                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2742                                (cdb[8] << 8) | cdb[9];
2743                 } else {
2744                         /* GPCMD_SEND_KEY from multi media commands */
2745                         size = (cdb[8] << 8) + cdb[9];
2746                 }
2747                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2748                 break;
2749         case MODE_SELECT:
2750                 size = cdb[4];
2751                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2752                 break;
2753         case MODE_SELECT_10:
2754                 size = (cdb[7] << 8) + cdb[8];
2755                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2756                 break;
2757         case MODE_SENSE:
2758                 size = cdb[4];
2759                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2760                 if (!passthrough)
2761                         cmd->execute_task = target_emulate_modesense;
2762                 break;
2763         case MODE_SENSE_10:
2764                 size = (cdb[7] << 8) + cdb[8];
2765                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2766                 if (!passthrough)
2767                         cmd->execute_task = target_emulate_modesense;
2768                 break;
2769         case GPCMD_READ_BUFFER_CAPACITY:
2770         case GPCMD_SEND_OPC:
2771         case LOG_SELECT:
2772         case LOG_SENSE:
2773                 size = (cdb[7] << 8) + cdb[8];
2774                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2775                 break;
2776         case READ_BLOCK_LIMITS:
2777                 size = READ_BLOCK_LEN;
2778                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2779                 break;
2780         case GPCMD_GET_CONFIGURATION:
2781         case GPCMD_READ_FORMAT_CAPACITIES:
2782         case GPCMD_READ_DISC_INFO:
2783         case GPCMD_READ_TRACK_RZONE_INFO:
2784                 size = (cdb[7] << 8) + cdb[8];
2785                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2786                 break;
2787         case PERSISTENT_RESERVE_IN:
2788                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2789                         cmd->execute_task = target_scsi3_emulate_pr_in;
2790                 size = (cdb[7] << 8) + cdb[8];
2791                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2792                 break;
2793         case PERSISTENT_RESERVE_OUT:
2794                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2795                         cmd->execute_task = target_scsi3_emulate_pr_out;
2796                 size = (cdb[7] << 8) + cdb[8];
2797                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2798                 break;
2799         case GPCMD_MECHANISM_STATUS:
2800         case GPCMD_READ_DVD_STRUCTURE:
2801                 size = (cdb[8] << 8) + cdb[9];
2802                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2803                 break;
2804         case READ_POSITION:
2805                 size = READ_POSITION_LEN;
2806                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2807                 break;
2808         case MAINTENANCE_OUT:
2809                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2810                         /* MAINTENANCE_OUT from SCC-2
2811                          *
2812                          * Check for emulated MO_SET_TARGET_PGS.
2813                          */
2814                         if (cdb[1] == MO_SET_TARGET_PGS &&
2815                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2816                                 cmd->execute_task =
2817                                         target_emulate_set_target_port_groups;
2818                         }
2819
2820                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2821                                (cdb[8] << 8) | cdb[9];
2822                 } else  {
2823                         /* GPCMD_REPORT_KEY from multi media commands */
2824                         size = (cdb[8] << 8) + cdb[9];
2825                 }
2826                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2827                 break;
2828         case INQUIRY:
2829                 size = (cdb[3] << 8) + cdb[4];
2830                 /*
2831                  * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2832                  * See spc4r17 section 5.3
2833                  */
2834                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2835                         cmd->sam_task_attr = MSG_HEAD_TAG;
2836                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2837                 if (!passthrough)
2838                         cmd->execute_task = target_emulate_inquiry;
2839                 break;
2840         case READ_BUFFER:
2841                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2842                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2843                 break;
2844         case READ_CAPACITY:
2845                 size = READ_CAP_LEN;
2846                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2847                 if (!passthrough)
2848                         cmd->execute_task = target_emulate_readcapacity;
2849                 break;
2850         case READ_MEDIA_SERIAL_NUMBER:
2851         case SECURITY_PROTOCOL_IN:
2852         case SECURITY_PROTOCOL_OUT:
2853                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2854                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2855                 break;
2856         case SERVICE_ACTION_IN:
2857                 switch (cmd->t_task_cdb[1] & 0x1f) {
2858                 case SAI_READ_CAPACITY_16:
2859                         if (!passthrough)
2860                                 cmd->execute_task =
2861                                         target_emulate_readcapacity_16;
2862                         break;
2863                 default:
2864                         if (passthrough)
2865                                 break;
2866
2867                         pr_err("Unsupported SA: 0x%02x\n",
2868                                 cmd->t_task_cdb[1] & 0x1f);
2869                         goto out_unsupported_cdb;
2870                 }
2871                 /*FALLTHROUGH*/
2872         case ACCESS_CONTROL_IN:
2873         case ACCESS_CONTROL_OUT:
2874         case EXTENDED_COPY:
2875         case READ_ATTRIBUTE:
2876         case RECEIVE_COPY_RESULTS:
2877         case WRITE_ATTRIBUTE:
2878                 size = (cdb[10] << 24) | (cdb[11] << 16) |
2879                        (cdb[12] << 8) | cdb[13];
2880                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2881                 break;
2882         case RECEIVE_DIAGNOSTIC:
2883         case SEND_DIAGNOSTIC:
2884                 size = (cdb[3] << 8) | cdb[4];
2885                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2886                 break;
2887 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2888 #if 0
2889         case GPCMD_READ_CD:
2890                 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2891                 size = (2336 * sectors);
2892                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2893                 break;
2894 #endif
2895         case READ_TOC:
2896                 size = cdb[8];
2897                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2898                 break;
2899         case REQUEST_SENSE:
2900                 size = cdb[4];
2901                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2902                 if (!passthrough)
2903                         cmd->execute_task = target_emulate_request_sense;
2904                 break;
2905         case READ_ELEMENT_STATUS:
2906                 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
2907                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2908                 break;
2909         case WRITE_BUFFER:
2910                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2911                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2912                 break;
2913         case RESERVE:
2914         case RESERVE_10:
2915                 /*
2916                  * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2917                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2918                  */
2919                 if (cdb[0] == RESERVE_10)
2920                         size = (cdb[7] << 8) | cdb[8];
2921                 else
2922                         size = cmd->data_length;
2923
2924                 /*
2925                  * Setup the legacy emulated handler for SPC-2 and
2926                  * >= SPC-3 compatible reservation handling (CRH=1)
2927                  * Otherwise, we assume the underlying SCSI logic is
2928                  * is running in SPC_PASSTHROUGH, and wants reservations
2929                  * emulation disabled.
2930                  */
2931                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2932                         cmd->execute_task = target_scsi2_reservation_reserve;
2933                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2934                 break;
2935         case RELEASE:
2936         case RELEASE_10:
2937                 /*
2938                  * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2939                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2940                 */
2941                 if (cdb[0] == RELEASE_10)
2942                         size = (cdb[7] << 8) | cdb[8];
2943                 else
2944                         size = cmd->data_length;
2945
2946                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2947                         cmd->execute_task = target_scsi2_reservation_release;
2948                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2949                 break;
2950         case SYNCHRONIZE_CACHE:
2951         case SYNCHRONIZE_CACHE_16:
2952                 /*
2953                  * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2954                  */
2955                 if (cdb[0] == SYNCHRONIZE_CACHE) {
2956                         sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2957                         cmd->t_task_lba = transport_lba_32(cdb);
2958                 } else {
2959                         sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2960                         cmd->t_task_lba = transport_lba_64(cdb);
2961                 }
2962                 if (sector_ret)
2963                         goto out_unsupported_cdb;
2964
2965                 size = transport_get_size(sectors, cdb, cmd);
2966                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2967
2968                 if (passthrough)
2969                         break;
2970
2971                 /*
2972                  * Check to ensure that LBA + Range does not exceed past end of
2973                  * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
2974                  */
2975                 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2976                         if (transport_cmd_get_valid_sectors(cmd) < 0)
2977                                 goto out_invalid_cdb_field;
2978                 }
2979                 cmd->execute_task = target_emulate_synchronize_cache;
2980                 break;
2981         case UNMAP:
2982                 size = get_unaligned_be16(&cdb[7]);
2983                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2984                 if (!passthrough)
2985                         cmd->execute_task = target_emulate_unmap;
2986                 break;
2987         case WRITE_SAME_16:
2988                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2989                 if (sector_ret)
2990                         goto out_unsupported_cdb;
2991
2992                 if (sectors)
2993                         size = transport_get_size(1, cdb, cmd);
2994                 else {
2995                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2996                         goto out_invalid_cdb_field;
2997                 }
2998
2999                 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
3000                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3001
3002                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3003                         goto out_unsupported_cdb;
3004                 if (!passthrough)
3005                         cmd->execute_task = target_emulate_write_same;
3006                 break;
3007         case WRITE_SAME:
3008                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3009                 if (sector_ret)
3010                         goto out_unsupported_cdb;
3011
3012                 if (sectors)
3013                         size = transport_get_size(1, cdb, cmd);
3014                 else {
3015                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3016                         goto out_invalid_cdb_field;
3017                 }
3018
3019                 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
3020                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3021                 /*
3022                  * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3023                  * of byte 1 bit 3 UNMAP instead of original reserved field
3024                  */
3025                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3026                         goto out_unsupported_cdb;
3027                 if (!passthrough)
3028                         cmd->execute_task = target_emulate_write_same;
3029                 break;
3030         case ALLOW_MEDIUM_REMOVAL:
3031         case ERASE:
3032         case REZERO_UNIT:
3033         case SEEK_10:
3034         case SPACE:
3035         case START_STOP:
3036         case TEST_UNIT_READY:
3037         case VERIFY:
3038         case WRITE_FILEMARKS:
3039                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3040                 if (!passthrough)
3041                         cmd->execute_task = target_emulate_noop;
3042                 break;
3043         case GPCMD_CLOSE_TRACK:
3044         case INITIALIZE_ELEMENT_STATUS:
3045         case GPCMD_LOAD_UNLOAD:
3046         case GPCMD_SET_SPEED:
3047         case MOVE_MEDIUM:
3048                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3049                 break;
3050         case REPORT_LUNS:
3051                 cmd->execute_task = target_report_luns;
3052                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3053                 /*
3054                  * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3055                  * See spc4r17 section 5.3
3056                  */
3057                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3058                         cmd->sam_task_attr = MSG_HEAD_TAG;
3059                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3060                 break;
3061         default:
3062                 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3063                         " 0x%02x, sending CHECK_CONDITION.\n",
3064                         cmd->se_tfo->get_fabric_name(), cdb[0]);
3065                 goto out_unsupported_cdb;
3066         }
3067
3068         if (size != cmd->data_length) {
3069                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3070                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3071                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3072                                 cmd->data_length, size, cdb[0]);
3073
3074                 cmd->cmd_spdtl = size;
3075
3076                 if (cmd->data_direction == DMA_TO_DEVICE) {
3077                         pr_err("Rejecting underflow/overflow"
3078                                         " WRITE data\n");
3079                         goto out_invalid_cdb_field;
3080                 }
3081                 /*
3082                  * Reject READ_* or WRITE_* with overflow/underflow for
3083                  * type SCF_SCSI_DATA_SG_IO_CDB.
3084                  */
3085                 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512))  {
3086                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3087                                 " CDB on non 512-byte sector setup subsystem"
3088                                 " plugin: %s\n", dev->transport->name);
3089                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3090                         goto out_invalid_cdb_field;
3091                 }
3092
3093                 if (size > cmd->data_length) {
3094                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3095                         cmd->residual_count = (size - cmd->data_length);
3096                 } else {
3097                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3098                         cmd->residual_count = (cmd->data_length - size);
3099                 }
3100                 cmd->data_length = size;
3101         }
3102
3103         /* reject any command that we don't have a handler for */
3104         if (!(passthrough || cmd->execute_task ||
3105              (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3106                 goto out_unsupported_cdb;
3107
3108         transport_set_supported_SAM_opcode(cmd);
3109         return ret;
3110
3111 out_unsupported_cdb:
3112         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3113         cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3114         return -EINVAL;
3115 out_invalid_cdb_field:
3116         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3117         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3118         return -EINVAL;
3119 }
3120
3121 /*
3122  * Called from I/O completion to determine which dormant/delayed
3123  * and ordered cmds need to have their tasks added to the execution queue.
3124  */
3125 static void transport_complete_task_attr(struct se_cmd *cmd)
3126 {
3127         struct se_device *dev = cmd->se_dev;
3128         struct se_cmd *cmd_p, *cmd_tmp;
3129         int new_active_tasks = 0;
3130
3131         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3132                 atomic_dec(&dev->simple_cmds);
3133                 smp_mb__after_atomic_dec();
3134                 dev->dev_cur_ordered_id++;
3135                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3136                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3137                         cmd->se_ordered_id);
3138         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3139                 dev->dev_cur_ordered_id++;
3140                 pr_debug("Incremented dev_cur_ordered_id: %u for"
3141                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3142                         cmd->se_ordered_id);
3143         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3144                 atomic_dec(&dev->dev_ordered_sync);
3145                 smp_mb__after_atomic_dec();
3146
3147                 dev->dev_cur_ordered_id++;
3148                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3149                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3150         }
3151         /*
3152          * Process all commands up to the last received
3153          * ORDERED task attribute which requires another blocking
3154          * boundary
3155          */
3156         spin_lock(&dev->delayed_cmd_lock);
3157         list_for_each_entry_safe(cmd_p, cmd_tmp,
3158                         &dev->delayed_cmd_list, se_delayed_node) {
3159
3160                 list_del(&cmd_p->se_delayed_node);
3161                 spin_unlock(&dev->delayed_cmd_lock);
3162
3163                 pr_debug("Calling add_tasks() for"
3164                         " cmd_p: 0x%02x Task Attr: 0x%02x"
3165                         " Dormant -> Active, se_ordered_id: %u\n",
3166                         cmd_p->t_task_cdb[0],
3167                         cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3168
3169                 transport_add_tasks_from_cmd(cmd_p);
3170                 new_active_tasks++;
3171
3172                 spin_lock(&dev->delayed_cmd_lock);
3173                 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3174                         break;
3175         }
3176         spin_unlock(&dev->delayed_cmd_lock);
3177         /*
3178          * If new tasks have become active, wake up the transport thread
3179          * to do the processing of the Active tasks.
3180          */
3181         if (new_active_tasks != 0)
3182                 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3183 }
3184
3185 static void transport_complete_qf(struct se_cmd *cmd)
3186 {
3187         int ret = 0;
3188
3189         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3190                 transport_complete_task_attr(cmd);
3191
3192         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3193                 ret = cmd->se_tfo->queue_status(cmd);
3194                 if (ret)
3195                         goto out;
3196         }
3197
3198         switch (cmd->data_direction) {
3199         case DMA_FROM_DEVICE:
3200                 ret = cmd->se_tfo->queue_data_in(cmd);
3201                 break;
3202         case DMA_TO_DEVICE:
3203                 if (cmd->t_bidi_data_sg) {
3204                         ret = cmd->se_tfo->queue_data_in(cmd);
3205                         if (ret < 0)
3206                                 break;
3207                 }
3208                 /* Fall through for DMA_TO_DEVICE */
3209         case DMA_NONE:
3210                 ret = cmd->se_tfo->queue_status(cmd);
3211                 break;
3212         default:
3213                 break;
3214         }
3215
3216 out:
3217         if (ret < 0) {
3218                 transport_handle_queue_full(cmd, cmd->se_dev);
3219                 return;
3220         }
3221         transport_lun_remove_cmd(cmd);
3222         transport_cmd_check_stop_to_fabric(cmd);
3223 }
3224
3225 static void transport_handle_queue_full(
3226         struct se_cmd *cmd,
3227         struct se_device *dev)
3228 {
3229         spin_lock_irq(&dev->qf_cmd_lock);
3230         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3231         atomic_inc(&dev->dev_qf_count);
3232         smp_mb__after_atomic_inc();
3233         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3234
3235         schedule_work(&cmd->se_dev->qf_work_queue);
3236 }
3237
3238 static void target_complete_ok_work(struct work_struct *work)
3239 {
3240         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3241         int reason = 0, ret;
3242
3243         /*
3244          * Check if we need to move delayed/dormant tasks from cmds on the
3245          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3246          * Attribute.
3247          */
3248         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3249                 transport_complete_task_attr(cmd);
3250         /*
3251          * Check to schedule QUEUE_FULL work, or execute an existing
3252          * cmd->transport_qf_callback()
3253          */
3254         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3255                 schedule_work(&cmd->se_dev->qf_work_queue);
3256
3257         /*
3258          * Check if we need to retrieve a sense buffer from
3259          * the struct se_cmd in question.
3260          */
3261         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3262                 if (transport_get_sense_data(cmd) < 0)
3263                         reason = TCM_NON_EXISTENT_LUN;
3264
3265                 /*
3266                  * Only set when an struct se_task->task_scsi_status returned
3267                  * a non GOOD status.
3268                  */
3269                 if (cmd->scsi_status) {
3270                         ret = transport_send_check_condition_and_sense(
3271                                         cmd, reason, 1);
3272                         if (ret == -EAGAIN || ret == -ENOMEM)
3273                                 goto queue_full;
3274
3275                         transport_lun_remove_cmd(cmd);
3276                         transport_cmd_check_stop_to_fabric(cmd);
3277                         return;
3278                 }
3279         }
3280         /*
3281          * Check for a callback, used by amongst other things
3282          * XDWRITE_READ_10 emulation.
3283          */
3284         if (cmd->transport_complete_callback)
3285                 cmd->transport_complete_callback(cmd);
3286
3287         switch (cmd->data_direction) {
3288         case DMA_FROM_DEVICE:
3289                 spin_lock(&cmd->se_lun->lun_sep_lock);
3290                 if (cmd->se_lun->lun_sep) {
3291                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3292                                         cmd->data_length;
3293                 }
3294                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3295
3296                 ret = cmd->se_tfo->queue_data_in(cmd);
3297                 if (ret == -EAGAIN || ret == -ENOMEM)
3298                         goto queue_full;
3299                 break;
3300         case DMA_TO_DEVICE:
3301                 spin_lock(&cmd->se_lun->lun_sep_lock);
3302                 if (cmd->se_lun->lun_sep) {
3303                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3304                                 cmd->data_length;
3305                 }
3306                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3307                 /*
3308                  * Check if we need to send READ payload for BIDI-COMMAND
3309                  */
3310                 if (cmd->t_bidi_data_sg) {
3311                         spin_lock(&cmd->se_lun->lun_sep_lock);
3312                         if (cmd->se_lun->lun_sep) {
3313                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3314                                         cmd->data_length;
3315                         }
3316                         spin_unlock(&cmd->se_lun->lun_sep_lock);
3317                         ret = cmd->se_tfo->queue_data_in(cmd);
3318                         if (ret == -EAGAIN || ret == -ENOMEM)
3319                                 goto queue_full;
3320                         break;
3321                 }
3322                 /* Fall through for DMA_TO_DEVICE */
3323         case DMA_NONE:
3324                 ret = cmd->se_tfo->queue_status(cmd);
3325                 if (ret == -EAGAIN || ret == -ENOMEM)
3326                         goto queue_full;
3327                 break;
3328         default:
3329                 break;
3330         }
3331
3332         transport_lun_remove_cmd(cmd);
3333         transport_cmd_check_stop_to_fabric(cmd);
3334         return;
3335
3336 queue_full:
3337         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3338                 " data_direction: %d\n", cmd, cmd->data_direction);
3339         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3340         transport_handle_queue_full(cmd, cmd->se_dev);
3341 }
3342
3343 static void transport_free_dev_tasks(struct se_cmd *cmd)
3344 {
3345         struct se_task *task, *task_tmp;
3346         unsigned long flags;
3347         LIST_HEAD(dispose_list);
3348
3349         spin_lock_irqsave(&cmd->t_state_lock, flags);
3350         list_for_each_entry_safe(task, task_tmp,
3351                                 &cmd->t_task_list, t_list) {
3352                 if (!(task->task_flags & TF_ACTIVE))
3353                         list_move_tail(&task->t_list, &dispose_list);
3354         }
3355         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3356
3357         while (!list_empty(&dispose_list)) {
3358                 task = list_first_entry(&dispose_list, struct se_task, t_list);
3359
3360                 if (task->task_sg != cmd->t_data_sg &&
3361                     task->task_sg != cmd->t_bidi_data_sg)
3362                         kfree(task->task_sg);
3363
3364                 list_del(&task->t_list);
3365
3366                 cmd->se_dev->transport->free_task(task);
3367         }
3368 }
3369
3370 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3371 {
3372         struct scatterlist *sg;
3373         int count;
3374
3375         for_each_sg(sgl, sg, nents, count)
3376                 __free_page(sg_page(sg));
3377
3378         kfree(sgl);
3379 }
3380
3381 static inline void transport_free_pages(struct se_cmd *cmd)
3382 {
3383         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3384                 return;
3385
3386         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3387         cmd->t_data_sg = NULL;
3388         cmd->t_data_nents = 0;
3389
3390         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3391         cmd->t_bidi_data_sg = NULL;
3392         cmd->t_bidi_data_nents = 0;
3393 }
3394
3395 /**
3396  * transport_release_cmd - free a command
3397  * @cmd:       command to free
3398  *
3399  * This routine unconditionally frees a command, and reference counting
3400  * or list removal must be done in the caller.
3401  */
3402 static void transport_release_cmd(struct se_cmd *cmd)
3403 {
3404         BUG_ON(!cmd->se_tfo);
3405
3406         if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
3407                 core_tmr_release_req(cmd->se_tmr_req);
3408         if (cmd->t_task_cdb != cmd->__t_task_cdb)
3409                 kfree(cmd->t_task_cdb);
3410         /*
3411          * If this cmd has been setup with target_get_sess_cmd(), drop
3412          * the kref and call ->release_cmd() in kref callback.
3413          */
3414          if (cmd->check_release != 0) {
3415                 target_put_sess_cmd(cmd->se_sess, cmd);
3416                 return;
3417         }
3418         cmd->se_tfo->release_cmd(cmd);
3419 }
3420
3421 /**
3422  * transport_put_cmd - release a reference to a command
3423  * @cmd:       command to release
3424  *
3425  * This routine releases our reference to the command and frees it if possible.
3426  */
3427 static void transport_put_cmd(struct se_cmd *cmd)
3428 {
3429         unsigned long flags;
3430         int free_tasks = 0;
3431
3432         spin_lock_irqsave(&cmd->t_state_lock, flags);
3433         if (atomic_read(&cmd->t_fe_count)) {
3434                 if (!atomic_dec_and_test(&cmd->t_fe_count))
3435                         goto out_busy;
3436         }
3437
3438         if (atomic_read(&cmd->t_se_count)) {
3439                 if (!atomic_dec_and_test(&cmd->t_se_count))
3440                         goto out_busy;
3441         }
3442
3443         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
3444                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
3445                 transport_all_task_dev_remove_state(cmd);
3446                 free_tasks = 1;
3447         }
3448         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3449
3450         if (free_tasks != 0)
3451                 transport_free_dev_tasks(cmd);
3452
3453         transport_free_pages(cmd);
3454         transport_release_cmd(cmd);
3455         return;
3456 out_busy:
3457         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3458 }
3459
3460 /*
3461  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3462  * allocating in the core.
3463  * @cmd:  Associated se_cmd descriptor
3464  * @mem:  SGL style memory for TCM WRITE / READ
3465  * @sg_mem_num: Number of SGL elements
3466  * @mem_bidi_in: SGL style memory for TCM BIDI READ
3467  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3468  *
3469  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3470  * of parameters.
3471  */
3472 int transport_generic_map_mem_to_cmd(
3473         struct se_cmd *cmd,
3474         struct scatterlist *sgl,
3475         u32 sgl_count,
3476         struct scatterlist *sgl_bidi,
3477         u32 sgl_bidi_count)
3478 {
3479         if (!sgl || !sgl_count)
3480                 return 0;
3481
3482         if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3483             (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3484                 /*
3485                  * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3486                  * scatterlists already have been set to follow what the fabric
3487                  * passes for the original expected data transfer length.
3488                  */
3489                 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3490                         pr_warn("Rejecting SCSI DATA overflow for fabric using"
3491                                 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3492                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3493                         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3494                         return -EINVAL;
3495                 }
3496
3497                 cmd->t_data_sg = sgl;
3498                 cmd->t_data_nents = sgl_count;
3499
3500                 if (sgl_bidi && sgl_bidi_count) {
3501                         cmd->t_bidi_data_sg = sgl_bidi;
3502                         cmd->t_bidi_data_nents = sgl_bidi_count;
3503                 }
3504                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3505         }
3506
3507         return 0;
3508 }
3509 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3510
3511 void *transport_kmap_data_sg(struct se_cmd *cmd)
3512 {
3513         struct scatterlist *sg = cmd->t_data_sg;
3514         struct page **pages;
3515         int i;
3516
3517         BUG_ON(!sg);
3518         /*
3519          * We need to take into account a possible offset here for fabrics like
3520          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3521          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3522          */
3523         if (!cmd->t_data_nents)
3524                 return NULL;
3525         else if (cmd->t_data_nents == 1)
3526                 return kmap(sg_page(sg)) + sg->offset;
3527
3528         /* >1 page. use vmap */
3529         pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3530         if (!pages)
3531                 return NULL;
3532
3533         /* convert sg[] to pages[] */
3534         for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
3535                 pages[i] = sg_page(sg);
3536         }
3537
3538         cmd->t_data_vmap = vmap(pages, cmd->t_data_nents,  VM_MAP, PAGE_KERNEL);
3539         kfree(pages);
3540         if (!cmd->t_data_vmap)
3541                 return NULL;
3542
3543         return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
3544 }
3545 EXPORT_SYMBOL(transport_kmap_data_sg);
3546
3547 void transport_kunmap_data_sg(struct se_cmd *cmd)
3548 {
3549         if (!cmd->t_data_nents) {
3550                 return;
3551         } else if (cmd->t_data_nents == 1) {
3552                 kunmap(sg_page(cmd->t_data_sg));
3553                 return;
3554         }
3555
3556         vunmap(cmd->t_data_vmap);
3557         cmd->t_data_vmap = NULL;
3558 }
3559 EXPORT_SYMBOL(transport_kunmap_data_sg);
3560
3561 static int
3562 transport_generic_get_mem(struct se_cmd *cmd)
3563 {
3564         u32 length = cmd->data_length;
3565         unsigned int nents;
3566         struct page *page;
3567         gfp_t zero_flag;
3568         int i = 0;
3569
3570         nents = DIV_ROUND_UP(length, PAGE_SIZE);
3571         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3572         if (!cmd->t_data_sg)
3573                 return -ENOMEM;
3574
3575         cmd->t_data_nents = nents;
3576         sg_init_table(cmd->t_data_sg, nents);
3577
3578         zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
3579
3580         while (length) {
3581                 u32 page_len = min_t(u32, length, PAGE_SIZE);
3582                 page = alloc_page(GFP_KERNEL | zero_flag);
3583                 if (!page)
3584                         goto out;
3585
3586                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3587                 length -= page_len;
3588                 i++;
3589         }
3590         return 0;
3591
3592 out:
3593         while (i >= 0) {
3594                 __free_page(sg_page(&cmd->t_data_sg[i]));
3595                 i--;
3596         }
3597         kfree(cmd->t_data_sg);
3598         cmd->t_data_sg = NULL;
3599         return -ENOMEM;
3600 }
3601
3602 /* Reduce sectors if they are too long for the device */
3603 static inline sector_t transport_limit_task_sectors(
3604         struct se_device *dev,
3605         unsigned long long lba,
3606         sector_t sectors)
3607 {
3608         sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
3609
3610         if (dev->transport->get_device_type(dev) == TYPE_DISK)
3611                 if ((lba + sectors) > transport_dev_end_lba(dev))
3612                         sectors = ((transport_dev_end_lba(dev) - lba) + 1);
3613
3614         return sectors;
3615 }
3616
3617
3618 /*
3619  * This function can be used by HW target mode drivers to create a linked
3620  * scatterlist from all contiguously allocated struct se_task->task_sg[].
3621  * This is intended to be called during the completion path by TCM Core
3622  * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3623  */
3624 void transport_do_task_sg_chain(struct se_cmd *cmd)
3625 {
3626         struct scatterlist *sg_first = NULL;
3627         struct scatterlist *sg_prev = NULL;
3628         int sg_prev_nents = 0;
3629         struct scatterlist *sg;
3630         struct se_task *task;
3631         u32 chained_nents = 0;
3632         int i;
3633
3634         BUG_ON(!cmd->se_tfo->task_sg_chaining);
3635
3636         /*
3637          * Walk the struct se_task list and setup scatterlist chains
3638          * for each contiguously allocated struct se_task->task_sg[].
3639          */
3640         list_for_each_entry(task, &cmd->t_task_list, t_list) {
3641                 if (!task->task_sg)
3642                         continue;
3643
3644                 if (!sg_first) {
3645                         sg_first = task->task_sg;
3646                         chained_nents = task->task_sg_nents;
3647                 } else {
3648                         sg_chain(sg_prev, sg_prev_nents, task->task_sg);
3649                         chained_nents += task->task_sg_nents;
3650                 }
3651                 /*
3652                  * For the padded tasks, use the extra SGL vector allocated
3653                  * in transport_allocate_data_tasks() for the sg_prev_nents
3654                  * offset into sg_chain() above.
3655                  *
3656                  * We do not need the padding for the last task (or a single
3657                  * task), but in that case we will never use the sg_prev_nents
3658                  * value below which would be incorrect.
3659                  */
3660                 sg_prev_nents = (task->task_sg_nents + 1);
3661                 sg_prev = task->task_sg;
3662         }
3663         /*
3664          * Setup the starting pointer and total t_tasks_sg_linked_no including
3665          * padding SGs for linking and to mark the end.
3666          */
3667         cmd->t_tasks_sg_chained = sg_first;
3668         cmd->t_tasks_sg_chained_no = chained_nents;
3669
3670         pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3671                 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3672                 cmd->t_tasks_sg_chained_no);
3673
3674         for_each_sg(cmd->t_tasks_sg_chained, sg,
3675                         cmd->t_tasks_sg_chained_no, i) {
3676
3677                 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3678                         i, sg, sg_page(sg), sg->length, sg->offset);
3679                 if (sg_is_chain(sg))
3680                         pr_debug("SG: %p sg_is_chain=1\n", sg);
3681                 if (sg_is_last(sg))
3682                         pr_debug("SG: %p sg_is_last=1\n", sg);
3683         }
3684 }
3685 EXPORT_SYMBOL(transport_do_task_sg_chain);
3686
3687 /*
3688  * Break up cmd into chunks transport can handle
3689  */
3690 static int
3691 transport_allocate_data_tasks(struct se_cmd *cmd,
3692         enum dma_data_direction data_direction,
3693         struct scatterlist *cmd_sg, unsigned int sgl_nents)
3694 {
3695         struct se_device *dev = cmd->se_dev;
3696         int task_count, i;
3697         unsigned long long lba;
3698         sector_t sectors, dev_max_sectors;
3699         u32 sector_size;
3700
3701         if (transport_cmd_get_valid_sectors(cmd) < 0)
3702                 return -EINVAL;
3703
3704         dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3705         sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3706
3707         WARN_ON(cmd->data_length % sector_size);
3708
3709         lba = cmd->t_task_lba;
3710         sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
3711         task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3712
3713         /*
3714          * If we need just a single task reuse the SG list in the command
3715          * and avoid a lot of work.
3716          */
3717         if (task_count == 1) {
3718                 struct se_task *task;
3719                 unsigned long flags;
3720
3721                 task = transport_generic_get_task(cmd, data_direction);
3722                 if (!task)
3723                         return -ENOMEM;
3724
3725                 task->task_sg = cmd_sg;
3726                 task->task_sg_nents = sgl_nents;
3727
3728                 task->task_lba = lba;
3729                 task->task_sectors = sectors;
3730                 task->task_size = task->task_sectors * sector_size;
3731
3732                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3733                 list_add_tail(&task->t_list, &cmd->t_task_list);
3734                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3735
3736                 return task_count;
3737         }
3738
3739         for (i = 0; i < task_count; i++) {
3740                 struct se_task *task;
3741                 unsigned int task_size, task_sg_nents_padded;
3742                 struct scatterlist *sg;
3743                 unsigned long flags;
3744                 int count;
3745
3746                 task = transport_generic_get_task(cmd, data_direction);
3747                 if (!task)
3748                         return -ENOMEM;
3749
3750                 task->task_lba = lba;
3751                 task->task_sectors = min(sectors, dev_max_sectors);
3752                 task->task_size = task->task_sectors * sector_size;
3753
3754                 /*
3755                  * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3756                  * in order to calculate the number per task SGL entries
3757                  */
3758                 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
3759                 /*
3760                  * Check if the fabric module driver is requesting that all
3761                  * struct se_task->task_sg[] be chained together..  If so,
3762                  * then allocate an extra padding SG entry for linking and
3763                  * marking the end of the chained SGL for every task except
3764                  * the last one for (task_count > 1) operation, or skipping
3765                  * the extra padding for the (task_count == 1) case.
3766                  */
3767                 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3768                         task_sg_nents_padded = (task->task_sg_nents + 1);
3769                 } else
3770                         task_sg_nents_padded = task->task_sg_nents;
3771
3772                 task->task_sg = kmalloc(sizeof(struct scatterlist) *
3773                                         task_sg_nents_padded, GFP_KERNEL);
3774                 if (!task->task_sg) {
3775                         cmd->se_dev->transport->free_task(task);
3776                         return -ENOMEM;
3777                 }
3778
3779                 sg_init_table(task->task_sg, task_sg_nents_padded);
3780
3781                 task_size = task->task_size;
3782
3783                 /* Build new sgl, only up to task_size */
3784                 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
3785                         if (cmd_sg->length > task_size)
3786                                 break;
3787
3788                         *sg = *cmd_sg;
3789                         task_size -= cmd_sg->length;
3790                         cmd_sg = sg_next(cmd_sg);
3791                 }
3792
3793                 lba += task->task_sectors;
3794                 sectors -= task->task_sectors;
3795
3796                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3797                 list_add_tail(&task->t_list, &cmd->t_task_list);
3798                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3799         }
3800
3801         return task_count;
3802 }
3803
3804 static int
3805 transport_allocate_control_task(struct se_cmd *cmd)
3806 {
3807         struct se_task *task;
3808         unsigned long flags;
3809
3810         /* Workaround for handling zero-length control CDBs */
3811         if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3812             !cmd->data_length)
3813                 return 0;
3814
3815         task = transport_generic_get_task(cmd, cmd->data_direction);
3816         if (!task)
3817                 return -ENOMEM;
3818
3819         task->task_sg = cmd->t_data_sg;
3820         task->task_size = cmd->data_length;
3821         task->task_sg_nents = cmd->t_data_nents;
3822
3823         spin_lock_irqsave(&cmd->t_state_lock, flags);
3824         list_add_tail(&task->t_list, &cmd->t_task_list);
3825         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3826
3827         /* Success! Return number of tasks allocated */
3828         return 1;
3829 }
3830
3831 /*
3832  * Allocate any required ressources to execute the command, and either place
3833  * it on the execution queue if possible.  For writes we might not have the
3834  * payload yet, thus notify the fabric via a call to ->write_pending instead.
3835  */
3836 int transport_generic_new_cmd(struct se_cmd *cmd)
3837 {
3838         struct se_device *dev = cmd->se_dev;
3839         int task_cdbs, task_cdbs_bidi = 0;
3840         int set_counts = 1;
3841         int ret = 0;
3842
3843         /*
3844          * Determine is the TCM fabric module has already allocated physical
3845          * memory, and is directly calling transport_generic_map_mem_to_cmd()
3846          * beforehand.
3847          */
3848         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3849             cmd->data_length) {
3850                 ret = transport_generic_get_mem(cmd);
3851                 if (ret < 0)
3852                         goto out_fail;
3853         }
3854
3855         /*
3856          * For BIDI command set up the read tasks first.
3857          */
3858         if (cmd->t_bidi_data_sg &&
3859             dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3860                 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3861
3862                 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3863                                 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3864                                 cmd->t_bidi_data_nents);
3865                 if (task_cdbs_bidi <= 0)
3866                         goto out_fail;
3867
3868                 atomic_inc(&cmd->t_fe_count);
3869                 atomic_inc(&cmd->t_se_count);
3870                 set_counts = 0;
3871         }
3872
3873         if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3874                 task_cdbs = transport_allocate_data_tasks(cmd,
3875                                         cmd->data_direction, cmd->t_data_sg,
3876                                         cmd->t_data_nents);
3877         } else {
3878                 task_cdbs = transport_allocate_control_task(cmd);
3879         }
3880
3881         if (task_cdbs < 0)
3882                 goto out_fail;
3883         else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
3884                 spin_lock_irq(&cmd->t_state_lock);
3885                 cmd->t_state = TRANSPORT_COMPLETE;
3886                 cmd->transport_state |= CMD_T_ACTIVE;
3887                 spin_unlock_irq(&cmd->t_state_lock);
3888
3889                 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
3890                         u8 ua_asc = 0, ua_ascq = 0;
3891
3892                         core_scsi3_ua_clear_for_request_sense(cmd,
3893                                         &ua_asc, &ua_ascq);
3894                 }
3895
3896                 INIT_WORK(&cmd->work, target_complete_ok_work);
3897                 queue_work(target_completion_wq, &cmd->work);
3898                 return 0;
3899         }
3900
3901         if (set_counts) {
3902                 atomic_inc(&cmd->t_fe_count);
3903                 atomic_inc(&cmd->t_se_count);
3904         }
3905
3906         cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3907         atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3908         atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
3909
3910         /*
3911          * For WRITEs, let the fabric know its buffer is ready..
3912          * This WRITE struct se_cmd (and all of its associated struct se_task's)
3913          * will be added to the struct se_device execution queue after its WRITE
3914          * data has arrived. (ie: It gets handled by the transport processing
3915          * thread a second time)
3916          */
3917         if (cmd->data_direction == DMA_TO_DEVICE) {
3918                 transport_add_tasks_to_state_queue(cmd);
3919                 return transport_generic_write_pending(cmd);
3920         }
3921         /*
3922          * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3923          * to the execution queue.
3924          */
3925         transport_execute_tasks(cmd);
3926         return 0;
3927
3928 out_fail:
3929         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3930         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3931         return -EINVAL;
3932 }
3933 EXPORT_SYMBOL(transport_generic_new_cmd);
3934
3935 /*      transport_generic_process_write():
3936  *
3937  *
3938  */
3939 void transport_generic_process_write(struct se_cmd *cmd)
3940 {
3941         transport_execute_tasks(cmd);
3942 }
3943 EXPORT_SYMBOL(transport_generic_process_write);
3944
3945 static void transport_write_pending_qf(struct se_cmd *cmd)
3946 {
3947         int ret;
3948
3949         ret = cmd->se_tfo->write_pending(cmd);
3950         if (ret == -EAGAIN || ret == -ENOMEM) {
3951                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3952                          cmd);
3953                 transport_handle_queue_full(cmd, cmd->se_dev);
3954         }
3955 }
3956
3957 static int transport_generic_write_pending(struct se_cmd *cmd)
3958 {
3959         unsigned long flags;
3960         int ret;
3961
3962         spin_lock_irqsave(&cmd->t_state_lock, flags);
3963         cmd->t_state = TRANSPORT_WRITE_PENDING;
3964         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3965
3966         /*
3967          * Clear the se_cmd for WRITE_PENDING status in order to set
3968          * CMD_T_ACTIVE so that transport_generic_handle_data can be called
3969          * from HW target mode interrupt code.  This is safe to be called
3970          * with transport_off=1 before the cmd->se_tfo->write_pending
3971          * because the se_cmd->se_lun pointer is not being cleared.
3972          */
3973         transport_cmd_check_stop(cmd, 1, 0);
3974
3975         /*
3976          * Call the fabric write_pending function here to let the
3977          * frontend know that WRITE buffers are ready.
3978          */
3979         ret = cmd->se_tfo->write_pending(cmd);
3980         if (ret == -EAGAIN || ret == -ENOMEM)
3981                 goto queue_full;
3982         else if (ret < 0)
3983                 return ret;
3984
3985         return 1;
3986
3987 queue_full:
3988         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
3989         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
3990         transport_handle_queue_full(cmd, cmd->se_dev);
3991         return 0;
3992 }
3993
3994 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
3995 {
3996         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3997                 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
3998                          transport_wait_for_tasks(cmd);
3999
4000                 transport_release_cmd(cmd);
4001         } else {
4002                 if (wait_for_tasks)
4003                         transport_wait_for_tasks(cmd);
4004
4005                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4006
4007                 if (cmd->se_lun)
4008                         transport_lun_remove_cmd(cmd);
4009
4010                 transport_free_dev_tasks(cmd);
4011
4012                 transport_put_cmd(cmd);
4013         }
4014 }
4015 EXPORT_SYMBOL(transport_generic_free_cmd);
4016
4017 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
4018  * @se_sess:    session to reference
4019  * @se_cmd:     command descriptor to add
4020  * @ack_kref:   Signal that fabric will perform an ack target_put_sess_cmd()
4021  */
4022 void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
4023                         bool ack_kref)
4024 {
4025         unsigned long flags;
4026
4027         kref_init(&se_cmd->cmd_kref);
4028         /*
4029          * Add a second kref if the fabric caller is expecting to handle
4030          * fabric acknowledgement that requires two target_put_sess_cmd()
4031          * invocations before se_cmd descriptor release.
4032          */
4033         if (ack_kref == true)
4034                 kref_get(&se_cmd->cmd_kref);
4035
4036         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4037         list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
4038         se_cmd->check_release = 1;
4039         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4040 }
4041 EXPORT_SYMBOL(target_get_sess_cmd);
4042
4043 static void target_release_cmd_kref(struct kref *kref)
4044 {
4045         struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
4046         struct se_session *se_sess = se_cmd->se_sess;
4047         unsigned long flags;
4048
4049         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4050         if (list_empty(&se_cmd->se_cmd_list)) {
4051                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4052                 WARN_ON(1);
4053                 return;
4054         }
4055         if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
4056                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4057                 complete(&se_cmd->cmd_wait_comp);
4058                 return;
4059         }
4060         list_del(&se_cmd->se_cmd_list);
4061         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4062
4063         se_cmd->se_tfo->release_cmd(se_cmd);
4064 }
4065
4066 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
4067  * @se_sess:    session to reference
4068  * @se_cmd:     command descriptor to drop
4069  */
4070 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
4071 {
4072         return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
4073 }
4074 EXPORT_SYMBOL(target_put_sess_cmd);
4075
4076 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
4077  * @se_sess:    session to split
4078  */
4079 void target_splice_sess_cmd_list(struct se_session *se_sess)
4080 {
4081         struct se_cmd *se_cmd;
4082         unsigned long flags;
4083
4084         WARN_ON(!list_empty(&se_sess->sess_wait_list));
4085         INIT_LIST_HEAD(&se_sess->sess_wait_list);
4086
4087         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4088         se_sess->sess_tearing_down = 1;
4089
4090         list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
4091
4092         list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
4093                 se_cmd->cmd_wait_set = 1;
4094
4095         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4096 }
4097 EXPORT_SYMBOL(target_splice_sess_cmd_list);
4098
4099 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
4100  * @se_sess:    session to wait for active I/O
4101  * @wait_for_tasks:     Make extra transport_wait_for_tasks call
4102  */
4103 void target_wait_for_sess_cmds(
4104         struct se_session *se_sess,
4105         int wait_for_tasks)
4106 {
4107         struct se_cmd *se_cmd, *tmp_cmd;
4108         bool rc = false;
4109
4110         list_for_each_entry_safe(se_cmd, tmp_cmd,
4111                                 &se_sess->sess_wait_list, se_cmd_list) {
4112                 list_del(&se_cmd->se_cmd_list);
4113
4114                 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4115                         " %d\n", se_cmd, se_cmd->t_state,
4116                         se_cmd->se_tfo->get_cmd_state(se_cmd));
4117
4118                 if (wait_for_tasks) {
4119                         pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4120                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4121                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
4122
4123                         rc = transport_wait_for_tasks(se_cmd);
4124
4125                         pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4126                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4127                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
4128                 }
4129
4130                 if (!rc) {
4131                         wait_for_completion(&se_cmd->cmd_wait_comp);
4132                         pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4133                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4134                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
4135                 }
4136
4137                 se_cmd->se_tfo->release_cmd(se_cmd);
4138         }
4139 }
4140 EXPORT_SYMBOL(target_wait_for_sess_cmds);
4141
4142 /*      transport_lun_wait_for_tasks():
4143  *
4144  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
4145  *      an struct se_lun to be successfully shutdown.
4146  */
4147 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4148 {
4149         unsigned long flags;
4150         int ret;
4151         /*
4152          * If the frontend has already requested this struct se_cmd to
4153          * be stopped, we can safely ignore this struct se_cmd.
4154          */
4155         spin_lock_irqsave(&cmd->t_state_lock, flags);
4156         if (cmd->transport_state & CMD_T_STOP) {
4157                 cmd->transport_state &= ~CMD_T_LUN_STOP;
4158
4159                 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
4160                          cmd->se_tfo->get_task_tag(cmd));
4161                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4162                 transport_cmd_check_stop(cmd, 1, 0);
4163                 return -EPERM;
4164         }
4165         cmd->transport_state |= CMD_T_LUN_FE_STOP;
4166         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4167
4168         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4169
4170         ret = transport_stop_tasks_for_cmd(cmd);
4171
4172         pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4173                         " %d\n", cmd, cmd->t_task_list_num, ret);
4174         if (!ret) {
4175                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4176                                 cmd->se_tfo->get_task_tag(cmd));
4177                 wait_for_completion(&cmd->transport_lun_stop_comp);
4178                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4179                                 cmd->se_tfo->get_task_tag(cmd));
4180         }
4181         transport_remove_cmd_from_queue(cmd);
4182
4183         return 0;
4184 }
4185
4186 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4187 {
4188         struct se_cmd *cmd = NULL;
4189         unsigned long lun_flags, cmd_flags;
4190         /*
4191          * Do exception processing and return CHECK_CONDITION status to the
4192          * Initiator Port.
4193          */
4194         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4195         while (!list_empty(&lun->lun_cmd_list)) {
4196                 cmd = list_first_entry(&lun->lun_cmd_list,
4197                        struct se_cmd, se_lun_node);
4198                 list_del_init(&cmd->se_lun_node);
4199
4200                 /*
4201                  * This will notify iscsi_target_transport.c:
4202                  * transport_cmd_check_stop() that a LUN shutdown is in
4203                  * progress for the iscsi_cmd_t.
4204                  */
4205                 spin_lock(&cmd->t_state_lock);
4206                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4207                         "_lun_stop for  ITT: 0x%08x\n",
4208                         cmd->se_lun->unpacked_lun,
4209                         cmd->se_tfo->get_task_tag(cmd));
4210                 cmd->transport_state |= CMD_T_LUN_STOP;
4211                 spin_unlock(&cmd->t_state_lock);
4212
4213                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4214
4215                 if (!cmd->se_lun) {
4216                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4217                                 cmd->se_tfo->get_task_tag(cmd),
4218                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4219                         BUG();
4220                 }
4221                 /*
4222                  * If the Storage engine still owns the iscsi_cmd_t, determine
4223                  * and/or stop its context.
4224                  */
4225                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4226                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4227                         cmd->se_tfo->get_task_tag(cmd));
4228
4229                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
4230                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4231                         continue;
4232                 }
4233
4234                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4235                         "_wait_for_tasks(): SUCCESS\n",
4236                         cmd->se_lun->unpacked_lun,
4237                         cmd->se_tfo->get_task_tag(cmd));
4238
4239                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4240                 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
4241                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4242                         goto check_cond;
4243                 }
4244                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
4245                 transport_all_task_dev_remove_state(cmd);
4246                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4247
4248                 transport_free_dev_tasks(cmd);
4249                 /*
4250                  * The Storage engine stopped this struct se_cmd before it was
4251                  * send to the fabric frontend for delivery back to the
4252                  * Initiator Node.  Return this SCSI CDB back with an
4253                  * CHECK_CONDITION status.
4254                  */
4255 check_cond:
4256                 transport_send_check_condition_and_sense(cmd,
4257                                 TCM_NON_EXISTENT_LUN, 0);
4258                 /*
4259                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
4260                  * be released, notify the waiting thread now that LU has
4261                  * finished accessing it.
4262                  */
4263                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4264                 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
4265                         pr_debug("SE_LUN[%d] - Detected FE stop for"
4266                                 " struct se_cmd: %p ITT: 0x%08x\n",
4267                                 lun->unpacked_lun,
4268                                 cmd, cmd->se_tfo->get_task_tag(cmd));
4269
4270                         spin_unlock_irqrestore(&cmd->t_state_lock,
4271                                         cmd_flags);
4272                         transport_cmd_check_stop(cmd, 1, 0);
4273                         complete(&cmd->transport_lun_fe_stop_comp);
4274                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4275                         continue;
4276                 }
4277                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4278                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
4279
4280                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4281                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4282         }
4283         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4284 }
4285
4286 static int transport_clear_lun_thread(void *p)
4287 {
4288         struct se_lun *lun = p;
4289
4290         __transport_clear_lun_from_sessions(lun);
4291         complete(&lun->lun_shutdown_comp);
4292
4293         return 0;
4294 }
4295
4296 int transport_clear_lun_from_sessions(struct se_lun *lun)
4297 {
4298         struct task_struct *kt;
4299
4300         kt = kthread_run(transport_clear_lun_thread, lun,
4301                         "tcm_cl_%u", lun->unpacked_lun);
4302         if (IS_ERR(kt)) {
4303                 pr_err("Unable to start clear_lun thread\n");
4304                 return PTR_ERR(kt);
4305         }
4306         wait_for_completion(&lun->lun_shutdown_comp);
4307
4308         return 0;
4309 }
4310
4311 /**
4312  * transport_wait_for_tasks - wait for completion to occur
4313  * @cmd:        command to wait
4314  *
4315  * Called from frontend fabric context to wait for storage engine
4316  * to pause and/or release frontend generated struct se_cmd.
4317  */
4318 bool transport_wait_for_tasks(struct se_cmd *cmd)
4319 {
4320         unsigned long flags;
4321
4322         spin_lock_irqsave(&cmd->t_state_lock, flags);
4323         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
4324             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
4325                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4326                 return false;
4327         }
4328         /*
4329          * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4330          * has been set in transport_set_supported_SAM_opcode().
4331          */
4332         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
4333             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
4334                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4335                 return false;
4336         }
4337         /*
4338          * If we are already stopped due to an external event (ie: LUN shutdown)
4339          * sleep until the connection can have the passed struct se_cmd back.
4340          * The cmd->transport_lun_stopped_sem will be upped by
4341          * transport_clear_lun_from_sessions() once the ConfigFS context caller
4342          * has completed its operation on the struct se_cmd.
4343          */
4344         if (cmd->transport_state & CMD_T_LUN_STOP) {
4345                 pr_debug("wait_for_tasks: Stopping"
4346                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4347                         "_stop_comp); for ITT: 0x%08x\n",
4348                         cmd->se_tfo->get_task_tag(cmd));
4349                 /*
4350                  * There is a special case for WRITES where a FE exception +
4351                  * LUN shutdown means ConfigFS context is still sleeping on
4352                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4353                  * We go ahead and up transport_lun_stop_comp just to be sure
4354                  * here.
4355                  */
4356                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4357                 complete(&cmd->transport_lun_stop_comp);
4358                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4359                 spin_lock_irqsave(&cmd->t_state_lock, flags);
4360
4361                 transport_all_task_dev_remove_state(cmd);
4362                 /*
4363                  * At this point, the frontend who was the originator of this
4364                  * struct se_cmd, now owns the structure and can be released through
4365                  * normal means below.
4366                  */
4367                 pr_debug("wait_for_tasks: Stopped"
4368                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4369                         "stop_comp); for ITT: 0x%08x\n",
4370                         cmd->se_tfo->get_task_tag(cmd));
4371
4372                 cmd->transport_state &= ~CMD_T_LUN_STOP;
4373         }
4374
4375         if (!(cmd->transport_state & CMD_T_ACTIVE) ||
4376              (cmd->transport_state & CMD_T_ABORTED)) {
4377                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4378                 return false;
4379         }
4380
4381         cmd->transport_state |= CMD_T_STOP;
4382
4383         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4384                 " i_state: %d, t_state: %d, CMD_T_STOP\n",
4385                 cmd, cmd->se_tfo->get_task_tag(cmd),
4386                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4387
4388         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4389
4390         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4391
4392         wait_for_completion(&cmd->t_transport_stop_comp);
4393
4394         spin_lock_irqsave(&cmd->t_state_lock, flags);
4395         cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
4396
4397         pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4398                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4399                 cmd->se_tfo->get_task_tag(cmd));
4400
4401         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4402
4403         return true;
4404 }
4405 EXPORT_SYMBOL(transport_wait_for_tasks);
4406
4407 static int transport_get_sense_codes(
4408         struct se_cmd *cmd,
4409         u8 *asc,
4410         u8 *ascq)
4411 {
4412         *asc = cmd->scsi_asc;
4413         *ascq = cmd->scsi_ascq;
4414
4415         return 0;
4416 }
4417
4418 static int transport_set_sense_codes(
4419         struct se_cmd *cmd,
4420         u8 asc,
4421         u8 ascq)
4422 {
4423         cmd->scsi_asc = asc;
4424         cmd->scsi_ascq = ascq;
4425
4426         return 0;
4427 }
4428
4429 int transport_send_check_condition_and_sense(
4430         struct se_cmd *cmd,
4431         u8 reason,
4432         int from_transport)
4433 {
4434         unsigned char *buffer = cmd->sense_buffer;
4435         unsigned long flags;
4436         int offset;
4437         u8 asc = 0, ascq = 0;
4438
4439         spin_lock_irqsave(&cmd->t_state_lock, flags);
4440         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4441                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4442                 return 0;
4443         }
4444         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4445         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4446
4447         if (!reason && from_transport)
4448                 goto after_reason;
4449
4450         if (!from_transport)
4451                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4452         /*
4453          * Data Segment and SenseLength of the fabric response PDU.
4454          *
4455          * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4456          * from include/scsi/scsi_cmnd.h
4457          */
4458         offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4459                                 TRANSPORT_SENSE_BUFFER);
4460         /*
4461          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
4462          * SENSE KEY values from include/scsi/scsi.h
4463          */
4464         switch (reason) {
4465         case TCM_NON_EXISTENT_LUN:
4466                 /* CURRENT ERROR */
4467                 buffer[offset] = 0x70;
4468                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4469                 /* ILLEGAL REQUEST */
4470                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4471                 /* LOGICAL UNIT NOT SUPPORTED */
4472                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4473                 break;
4474         case TCM_UNSUPPORTED_SCSI_OPCODE:
4475         case TCM_SECTOR_COUNT_TOO_MANY:
4476                 /* CURRENT ERROR */
4477                 buffer[offset] = 0x70;
4478                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4479                 /* ILLEGAL REQUEST */
4480                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4481                 /* INVALID COMMAND OPERATION CODE */
4482                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4483                 break;
4484         case TCM_UNKNOWN_MODE_PAGE:
4485                 /* CURRENT ERROR */
4486                 buffer[offset] = 0x70;
4487                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4488                 /* ILLEGAL REQUEST */
4489                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4490                 /* INVALID FIELD IN CDB */
4491                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4492                 break;
4493         case TCM_CHECK_CONDITION_ABORT_CMD:
4494                 /* CURRENT ERROR */
4495                 buffer[offset] = 0x70;
4496                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4497                 /* ABORTED COMMAND */
4498                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4499                 /* BUS DEVICE RESET FUNCTION OCCURRED */
4500                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4501                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4502                 break;
4503         case TCM_INCORRECT_AMOUNT_OF_DATA:
4504                 /* CURRENT ERROR */
4505                 buffer[offset] = 0x70;
4506                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4507                 /* ABORTED COMMAND */
4508                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4509                 /* WRITE ERROR */
4510                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4511                 /* NOT ENOUGH UNSOLICITED DATA */
4512                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4513                 break;
4514         case TCM_INVALID_CDB_FIELD:
4515                 /* CURRENT ERROR */
4516                 buffer[offset] = 0x70;
4517                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4518                 /* ILLEGAL REQUEST */
4519                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4520                 /* INVALID FIELD IN CDB */
4521                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4522                 break;
4523         case TCM_INVALID_PARAMETER_LIST:
4524                 /* CURRENT ERROR */
4525                 buffer[offset] = 0x70;
4526                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4527                 /* ILLEGAL REQUEST */
4528                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4529                 /* INVALID FIELD IN PARAMETER LIST */
4530                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4531                 break;
4532         case TCM_UNEXPECTED_UNSOLICITED_DATA:
4533                 /* CURRENT ERROR */
4534                 buffer[offset] = 0x70;
4535                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4536                 /* ABORTED COMMAND */
4537                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4538                 /* WRITE ERROR */
4539                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4540                 /* UNEXPECTED_UNSOLICITED_DATA */
4541                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4542                 break;
4543         case TCM_SERVICE_CRC_ERROR:
4544                 /* CURRENT ERROR */
4545                 buffer[offset] = 0x70;
4546                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4547                 /* ABORTED COMMAND */
4548                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4549                 /* PROTOCOL SERVICE CRC ERROR */
4550                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4551                 /* N/A */
4552                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4553                 break;
4554         case TCM_SNACK_REJECTED:
4555                 /* CURRENT ERROR */
4556                 buffer[offset] = 0x70;
4557                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4558                 /* ABORTED COMMAND */
4559                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4560                 /* READ ERROR */
4561                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4562                 /* FAILED RETRANSMISSION REQUEST */
4563                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4564                 break;
4565         case TCM_WRITE_PROTECTED:
4566                 /* CURRENT ERROR */
4567                 buffer[offset] = 0x70;
4568                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4569                 /* DATA PROTECT */
4570                 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4571                 /* WRITE PROTECTED */
4572                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4573                 break;
4574         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4575                 /* CURRENT ERROR */
4576                 buffer[offset] = 0x70;
4577                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4578                 /* UNIT ATTENTION */
4579                 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4580                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4581                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4582                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4583                 break;
4584         case TCM_CHECK_CONDITION_NOT_READY:
4585                 /* CURRENT ERROR */
4586                 buffer[offset] = 0x70;
4587                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4588                 /* Not Ready */
4589                 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4590                 transport_get_sense_codes(cmd, &asc, &ascq);
4591                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4592                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4593                 break;
4594         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4595         default:
4596                 /* CURRENT ERROR */
4597                 buffer[offset] = 0x70;
4598                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4599                 /* ILLEGAL REQUEST */
4600                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4601                 /* LOGICAL UNIT COMMUNICATION FAILURE */
4602                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4603                 break;
4604         }
4605         /*
4606          * This code uses linux/include/scsi/scsi.h SAM status codes!
4607          */
4608         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4609         /*
4610          * Automatically padded, this value is encoded in the fabric's
4611          * data_length response PDU containing the SCSI defined sense data.
4612          */
4613         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
4614
4615 after_reason:
4616         return cmd->se_tfo->queue_status(cmd);
4617 }
4618 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4619
4620 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4621 {
4622         int ret = 0;
4623
4624         if (cmd->transport_state & CMD_T_ABORTED) {
4625                 if (!send_status ||
4626                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4627                         return 1;
4628 #if 0
4629                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4630                         " status for CDB: 0x%02x ITT: 0x%08x\n",
4631                         cmd->t_task_cdb[0],
4632                         cmd->se_tfo->get_task_tag(cmd));
4633 #endif
4634                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4635                 cmd->se_tfo->queue_status(cmd);
4636                 ret = 1;
4637         }
4638         return ret;
4639 }
4640 EXPORT_SYMBOL(transport_check_aborted_status);
4641
4642 void transport_send_task_abort(struct se_cmd *cmd)
4643 {
4644         unsigned long flags;
4645
4646         spin_lock_irqsave(&cmd->t_state_lock, flags);
4647         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4648                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4649                 return;
4650         }
4651         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4652
4653         /*
4654          * If there are still expected incoming fabric WRITEs, we wait
4655          * until until they have completed before sending a TASK_ABORTED
4656          * response.  This response with TASK_ABORTED status will be
4657          * queued back to fabric module by transport_check_aborted_status().
4658          */
4659         if (cmd->data_direction == DMA_TO_DEVICE) {
4660                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4661                         cmd->transport_state |= CMD_T_ABORTED;
4662                         smp_mb__after_atomic_inc();
4663                 }
4664         }
4665         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4666 #if 0
4667         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4668                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4669                 cmd->se_tfo->get_task_tag(cmd));
4670 #endif
4671         cmd->se_tfo->queue_status(cmd);
4672 }
4673
4674 static int transport_generic_do_tmr(struct se_cmd *cmd)
4675 {
4676         struct se_device *dev = cmd->se_dev;
4677         struct se_tmr_req *tmr = cmd->se_tmr_req;
4678         int ret;
4679
4680         switch (tmr->function) {
4681         case TMR_ABORT_TASK:
4682                 tmr->response = TMR_FUNCTION_REJECTED;
4683                 break;
4684         case TMR_ABORT_TASK_SET:
4685         case TMR_CLEAR_ACA:
4686         case TMR_CLEAR_TASK_SET:
4687                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4688                 break;
4689         case TMR_LUN_RESET:
4690                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4691                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4692                                          TMR_FUNCTION_REJECTED;
4693                 break;
4694         case TMR_TARGET_WARM_RESET:
4695                 tmr->response = TMR_FUNCTION_REJECTED;
4696                 break;
4697         case TMR_TARGET_COLD_RESET:
4698                 tmr->response = TMR_FUNCTION_REJECTED;
4699                 break;
4700         default:
4701                 pr_err("Uknown TMR function: 0x%02x.\n",
4702                                 tmr->function);
4703                 tmr->response = TMR_FUNCTION_REJECTED;
4704                 break;
4705         }
4706
4707         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4708         cmd->se_tfo->queue_tm_rsp(cmd);
4709
4710         transport_cmd_check_stop_to_fabric(cmd);
4711         return 0;
4712 }
4713
4714 /*      transport_processing_thread():
4715  *
4716  *
4717  */
4718 static int transport_processing_thread(void *param)
4719 {
4720         int ret;
4721         struct se_cmd *cmd;
4722         struct se_device *dev = param;
4723
4724         while (!kthread_should_stop()) {
4725                 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4726                                 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4727                                 kthread_should_stop());
4728                 if (ret < 0)
4729                         goto out;
4730
4731 get_cmd:
4732                 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4733                 if (!cmd)
4734                         continue;
4735
4736                 switch (cmd->t_state) {
4737                 case TRANSPORT_NEW_CMD:
4738                         BUG();
4739                         break;
4740                 case TRANSPORT_NEW_CMD_MAP:
4741                         if (!cmd->se_tfo->new_cmd_map) {
4742                                 pr_err("cmd->se_tfo->new_cmd_map is"
4743                                         " NULL for TRANSPORT_NEW_CMD_MAP\n");
4744                                 BUG();
4745                         }
4746                         ret = cmd->se_tfo->new_cmd_map(cmd);
4747                         if (ret < 0) {
4748                                 transport_generic_request_failure(cmd);
4749                                 break;
4750                         }
4751                         ret = transport_generic_new_cmd(cmd);
4752                         if (ret < 0) {
4753                                 transport_generic_request_failure(cmd);
4754                                 break;
4755                         }
4756                         break;
4757                 case TRANSPORT_PROCESS_WRITE:
4758                         transport_generic_process_write(cmd);
4759                         break;
4760                 case TRANSPORT_PROCESS_TMR:
4761                         transport_generic_do_tmr(cmd);
4762                         break;
4763                 case TRANSPORT_COMPLETE_QF_WP:
4764                         transport_write_pending_qf(cmd);
4765                         break;
4766                 case TRANSPORT_COMPLETE_QF_OK:
4767                         transport_complete_qf(cmd);
4768                         break;
4769                 default:
4770                         pr_err("Unknown t_state: %d  for ITT: 0x%08x "
4771                                 "i_state: %d on SE LUN: %u\n",
4772                                 cmd->t_state,
4773                                 cmd->se_tfo->get_task_tag(cmd),
4774                                 cmd->se_tfo->get_cmd_state(cmd),
4775                                 cmd->se_lun->unpacked_lun);
4776                         BUG();
4777                 }
4778
4779                 goto get_cmd;
4780         }
4781
4782 out:
4783         WARN_ON(!list_empty(&dev->state_task_list));
4784         WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4785         dev->process_thread = NULL;
4786         return 0;
4787 }