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

   1 /*******************************************************************************
   2  * Filename:  target_core_transport.c
   3  *
   4  * This file contains the Generic Target Engine Core.
   5  *
   6  * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
   7  * Copyright (c) 2005, 2006, 2007 SBE, Inc.
   8  * Copyright (c) 2007-2010 Rising Tide Systems
   9  * Copyright (c) 2008-2010 Linux-iSCSI.org
  10  *
  11  * Nicholas A. Bellinger <nab@kernel.org>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  *
  27  ******************************************************************************/
  28
  29 #include <linux/net.h>
  30 #include <linux/delay.h>
  31 #include <linux/string.h>
  32 #include <linux/timer.h>
  33 #include <linux/slab.h>
  34 #include <linux/blkdev.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/kthread.h>
  37 #include <linux/in.h>
  38 #include <linux/cdrom.h>
  39 #include <linux/module.h>
  40 #include <linux/ratelimit.h>
  41 #include <asm/unaligned.h>
  42 #include <net/sock.h>
  43 #include <net/tcp.h>
  44 #include <scsi/scsi.h>
  45 #include <scsi/scsi_cmnd.h>
  46 #include <scsi/scsi_tcq.h>
  47
  48 #include <target/target_core_base.h>
  49 #include <target/target_core_backend.h>
  50 #include <target/target_core_fabric.h>
  51 #include <target/target_core_configfs.h>
  52
  53 #include "target_core_internal.h"
  54 #include "target_core_alua.h"
  55 #include "target_core_pr.h"
  56 #include "target_core_ua.h"
  57
  58 static int sub_api_initialized;
  59
  60 static struct workqueue_struct *target_completion_wq;
  61 static struct kmem_cache *se_sess_cache;
  62 struct kmem_cache *se_ua_cache;
  63 struct kmem_cache *t10_pr_reg_cache;
  64 struct kmem_cache *t10_alua_lu_gp_cache;
  65 struct kmem_cache *t10_alua_lu_gp_mem_cache;
  66 struct kmem_cache *t10_alua_tg_pt_gp_cache;
  67 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
  68
  69 static int transport_generic_write_pending(struct se_cmd *);
  70 static int transport_processing_thread(void *param);
  71 static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *);
  72 static void transport_complete_task_attr(struct se_cmd *cmd);
  73 static void transport_handle_queue_full(struct se_cmd *cmd,
  74                 struct se_device *dev);
  75 static int transport_generic_get_mem(struct se_cmd *cmd);
  76 static void transport_put_cmd(struct se_cmd *cmd);
  77 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
  78 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
  79 static void target_complete_ok_work(struct work_struct *work);
  80
  81 int init_se_kmem_caches(void)
  82 {
  83         se_sess_cache = kmem_cache_create("se_sess_cache",
  84                         sizeof(struct se_session), __alignof__(struct se_session),
  85                         0, NULL);
  86         if (!se_sess_cache) {
  87                 pr_err("kmem_cache_create() for struct se_session"
  88                                 " failed\n");
  89                 goto out;
  90         }
  91         se_ua_cache = kmem_cache_create("se_ua_cache",
  92                         sizeof(struct se_ua), __alignof__(struct se_ua),
  93                         0, NULL);
  94         if (!se_ua_cache) {
  95                 pr_err("kmem_cache_create() for struct se_ua failed\n");
  96                 goto out_free_sess_cache;
  97         }
  98         t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
  99                         sizeof(struct t10_pr_registration),
 100                         __alignof__(struct t10_pr_registration), 0, NULL);
 101         if (!t10_pr_reg_cache) {
 102                 pr_err("kmem_cache_create() for struct t10_pr_registration"
 103                                 " failed\n");
 104                 goto out_free_ua_cache;
 105         }
 106         t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
 107                         sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
 108                         0, NULL);
 109         if (!t10_alua_lu_gp_cache) {
 110                 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
 111                                 " failed\n");
 112                 goto out_free_pr_reg_cache;
 113         }
 114         t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
 115                         sizeof(struct t10_alua_lu_gp_member),
 116                         __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
 117         if (!t10_alua_lu_gp_mem_cache) {
 118                 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
 119                                 "cache failed\n");
 120                 goto out_free_lu_gp_cache;
 121         }
 122         t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
 123                         sizeof(struct t10_alua_tg_pt_gp),
 124                         __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
 125         if (!t10_alua_tg_pt_gp_cache) {
 126                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 127                                 "cache failed\n");
 128                 goto out_free_lu_gp_mem_cache;
 129         }
 130         t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
 131                         "t10_alua_tg_pt_gp_mem_cache",
 132                         sizeof(struct t10_alua_tg_pt_gp_member),
 133                         __alignof__(struct t10_alua_tg_pt_gp_member),
 134                         0, NULL);
 135         if (!t10_alua_tg_pt_gp_mem_cache) {
 136                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 137                                 "mem_t failed\n");
 138                 goto out_free_tg_pt_gp_cache;
 139         }
 140
 141         target_completion_wq = alloc_workqueue("target_completion",
 142                                                WQ_MEM_RECLAIM, 0);
 143         if (!target_completion_wq)
 144                 goto out_free_tg_pt_gp_mem_cache;
 145
 146         return 0;
 147
 148 out_free_tg_pt_gp_mem_cache:
 149         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 150 out_free_tg_pt_gp_cache:
 151         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 152 out_free_lu_gp_mem_cache:
 153         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 154 out_free_lu_gp_cache:
 155         kmem_cache_destroy(t10_alua_lu_gp_cache);
 156 out_free_pr_reg_cache:
 157         kmem_cache_destroy(t10_pr_reg_cache);
 158 out_free_ua_cache:
 159         kmem_cache_destroy(se_ua_cache);
 160 out_free_sess_cache:
 161         kmem_cache_destroy(se_sess_cache);
 162 out:
 163         return -ENOMEM;
 164 }
 165
 166 void release_se_kmem_caches(void)
 167 {
 168         destroy_workqueue(target_completion_wq);
 169         kmem_cache_destroy(se_sess_cache);
 170         kmem_cache_destroy(se_ua_cache);
 171         kmem_cache_destroy(t10_pr_reg_cache);
 172         kmem_cache_destroy(t10_alua_lu_gp_cache);
 173         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 174         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 175         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 176 }
 177
 178 /* This code ensures unique mib indexes are handed out. */
 179 static DEFINE_SPINLOCK(scsi_mib_index_lock);
 180 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
 181
 182 /*
 183  * Allocate a new row index for the entry type specified
 184  */
 185 u32 scsi_get_new_index(scsi_index_t type)
 186 {
 187         u32 new_index;
 188
 189         BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
 190
 191         spin_lock(&scsi_mib_index_lock);
 192         new_index = ++scsi_mib_index[type];
 193         spin_unlock(&scsi_mib_index_lock);
 194
 195         return new_index;
 196 }
 197
 198 static void transport_init_queue_obj(struct se_queue_obj *qobj)
 199 {
 200         atomic_set(&qobj->queue_cnt, 0);
 201         INIT_LIST_HEAD(&qobj->qobj_list);
 202         init_waitqueue_head(&qobj->thread_wq);
 203         spin_lock_init(&qobj->cmd_queue_lock);
 204 }
 205
 206 void transport_subsystem_check_init(void)
 207 {
 208         int ret;
 209
 210         if (sub_api_initialized)
 211                 return;
 212
 213         ret = request_module("target_core_iblock");
 214         if (ret != 0)
 215                 pr_err("Unable to load target_core_iblock\n");
 216
 217         ret = request_module("target_core_file");
 218         if (ret != 0)
 219                 pr_err("Unable to load target_core_file\n");
 220
 221         ret = request_module("target_core_pscsi");
 222         if (ret != 0)
 223                 pr_err("Unable to load target_core_pscsi\n");
 224
 225         ret = request_module("target_core_stgt");
 226         if (ret != 0)
 227                 pr_err("Unable to load target_core_stgt\n");
 228
 229         sub_api_initialized = 1;
 230         return;
 231 }
 232
 233 struct se_session *transport_init_session(void)
 234 {
 235         struct se_session *se_sess;
 236
 237         se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
 238         if (!se_sess) {
 239                 pr_err("Unable to allocate struct se_session from"
 240                                 " se_sess_cache\n");
 241                 return ERR_PTR(-ENOMEM);
 242         }
 243         INIT_LIST_HEAD(&se_sess->sess_list);
 244         INIT_LIST_HEAD(&se_sess->sess_acl_list);
 245         INIT_LIST_HEAD(&se_sess->sess_cmd_list);
 246         INIT_LIST_HEAD(&se_sess->sess_wait_list);
 247         spin_lock_init(&se_sess->sess_cmd_lock);
 248         kref_init(&se_sess->sess_kref);
 249
 250         return se_sess;
 251 }
 252 EXPORT_SYMBOL(transport_init_session);
 253
 254 /*
 255  * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
 256  */
 257 void __transport_register_session(
 258         struct se_portal_group *se_tpg,
 259         struct se_node_acl *se_nacl,
 260         struct se_session *se_sess,
 261         void *fabric_sess_ptr)
 262 {
 263         unsigned char buf[PR_REG_ISID_LEN];
 264
 265         se_sess->se_tpg = se_tpg;
 266         se_sess->fabric_sess_ptr = fabric_sess_ptr;
 267         /*
 268          * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
 269          *
 270          * Only set for struct se_session's that will actually be moving I/O.
 271          * eg: *NOT* discovery sessions.
 272          */
 273         if (se_nacl) {
 274                 /*
 275                  * If the fabric module supports an ISID based TransportID,
 276                  * save this value in binary from the fabric I_T Nexus now.
 277                  */
 278                 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
 279                         memset(&buf[0], 0, PR_REG_ISID_LEN);
 280                         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
 281                                         &buf[0], PR_REG_ISID_LEN);
 282                         se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
 283                 }
 284                 kref_get(&se_nacl->acl_kref);
 285
 286                 spin_lock_irq(&se_nacl->nacl_sess_lock);
 287                 /*
 288                  * The se_nacl->nacl_sess pointer will be set to the
 289                  * last active I_T Nexus for each struct se_node_acl.
 290                  */
 291                 se_nacl->nacl_sess = se_sess;
 292
 293                 list_add_tail(&se_sess->sess_acl_list,
 294                               &se_nacl->acl_sess_list);
 295                 spin_unlock_irq(&se_nacl->nacl_sess_lock);
 296         }
 297         list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
 298
 299         pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
 300                 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
 301 }
 302 EXPORT_SYMBOL(__transport_register_session);
 303
 304 void transport_register_session(
 305         struct se_portal_group *se_tpg,
 306         struct se_node_acl *se_nacl,
 307         struct se_session *se_sess,
 308         void *fabric_sess_ptr)
 309 {
 310         unsigned long flags;
 311
 312         spin_lock_irqsave(&se_tpg->session_lock, flags);
 313         __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
 314         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 315 }
 316 EXPORT_SYMBOL(transport_register_session);
 317
 318 static void target_release_session(struct kref *kref)
 319 {
 320         struct se_session *se_sess = container_of(kref,
 321                         struct se_session, sess_kref);
 322         struct se_portal_group *se_tpg = se_sess->se_tpg;
 323
 324         se_tpg->se_tpg_tfo->close_session(se_sess);
 325 }
 326
 327 void target_get_session(struct se_session *se_sess)
 328 {
 329         kref_get(&se_sess->sess_kref);
 330 }
 331 EXPORT_SYMBOL(target_get_session);
 332
 333 void target_put_session(struct se_session *se_sess)
 334 {
 335         kref_put(&se_sess->sess_kref, target_release_session);
 336 }
 337 EXPORT_SYMBOL(target_put_session);
 338
 339 static void target_complete_nacl(struct kref *kref)
 340 {
 341         struct se_node_acl *nacl = container_of(kref,
 342                                 struct se_node_acl, acl_kref);
 343
 344         complete(&nacl->acl_free_comp);
 345 }
 346
 347 void target_put_nacl(struct se_node_acl *nacl)
 348 {
 349         kref_put(&nacl->acl_kref, target_complete_nacl);
 350 }
 351
 352 void transport_deregister_session_configfs(struct se_session *se_sess)
 353 {
 354         struct se_node_acl *se_nacl;
 355         unsigned long flags;
 356         /*
 357          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
 358          */
 359         se_nacl = se_sess->se_node_acl;
 360         if (se_nacl) {
 361                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
 362                 if (se_nacl->acl_stop == 0)
 363                         list_del(&se_sess->sess_acl_list);
 364                 /*
 365                  * If the session list is empty, then clear the pointer.
 366                  * Otherwise, set the struct se_session pointer from the tail
 367                  * element of the per struct se_node_acl active session list.
 368                  */
 369                 if (list_empty(&se_nacl->acl_sess_list))
 370                         se_nacl->nacl_sess = NULL;
 371                 else {
 372                         se_nacl->nacl_sess = container_of(
 373                                         se_nacl->acl_sess_list.prev,
 374                                         struct se_session, sess_acl_list);
 375                 }
 376                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
 377         }
 378 }
 379 EXPORT_SYMBOL(transport_deregister_session_configfs);
 380
 381 void transport_free_session(struct se_session *se_sess)
 382 {
 383         kmem_cache_free(se_sess_cache, se_sess);
 384 }
 385 EXPORT_SYMBOL(transport_free_session);
 386
 387 void transport_deregister_session(struct se_session *se_sess)
 388 {
 389         struct se_portal_group *se_tpg = se_sess->se_tpg;
 390         struct target_core_fabric_ops *se_tfo;
 391         struct se_node_acl *se_nacl;
 392         unsigned long flags;
 393         bool comp_nacl = true;
 394
 395         if (!se_tpg) {
 396                 transport_free_session(se_sess);
 397                 return;
 398         }
 399         se_tfo = se_tpg->se_tpg_tfo;
 400
 401         spin_lock_irqsave(&se_tpg->session_lock, flags);
 402         list_del(&se_sess->sess_list);
 403         se_sess->se_tpg = NULL;
 404         se_sess->fabric_sess_ptr = NULL;
 405         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 406
 407         /*
 408          * Determine if we need to do extra work for this initiator node's
 409          * struct se_node_acl if it had been previously dynamically generated.
 410          */
 411         se_nacl = se_sess->se_node_acl;
 412
 413         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 414         if (se_nacl && se_nacl->dynamic_node_acl) {
 415                 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
 416                         list_del(&se_nacl->acl_list);
 417                         se_tpg->num_node_acls--;
 418                         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 419                         core_tpg_wait_for_nacl_pr_ref(se_nacl);
 420                         core_free_device_list_for_node(se_nacl, se_tpg);
 421                         se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
 422
 423                         comp_nacl = false;
 424                         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 425                 }
 426         }
 427         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 428
 429         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
 430                 se_tpg->se_tpg_tfo->get_fabric_name());
 431         /*
 432          * If last kref is dropping now for an explict NodeACL, awake sleeping
 433          * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
 434          * removal context.
 435          */
 436         if (se_nacl && comp_nacl == true)
 437                 target_put_nacl(se_nacl);
 438
 439         transport_free_session(se_sess);
 440 }
 441 EXPORT_SYMBOL(transport_deregister_session);
 442
 443 /*
 444  * Called with cmd->t_state_lock held.
 445  */
 446 static void target_remove_from_state_list(struct se_cmd *cmd)
 447 {
 448         struct se_device *dev = cmd->se_dev;
 449         unsigned long flags;
 450
 451         if (!dev)
 452                 return;
 453
 454         if (cmd->transport_state & CMD_T_BUSY)
 455                 return;
 456
 457         spin_lock_irqsave(&dev->execute_task_lock, flags);
 458         if (cmd->state_active) {
 459                 list_del(&cmd->state_list);
 460                 cmd->state_active = false;
 461         }
 462         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 463 }
 464
 465 /*      transport_cmd_check_stop():
 466  *
 467  *      'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
 468  *      'transport_off = 2' determines if task_dev_state should be removed.
 469  *
 470  *      A non-zero u8 t_state sets cmd->t_state.
 471  *      Returns 1 when command is stopped, else 0.
 472  */
 473 static int transport_cmd_check_stop(
 474         struct se_cmd *cmd,
 475         int transport_off,
 476         u8 t_state)
 477 {
 478         unsigned long flags;
 479
 480         spin_lock_irqsave(&cmd->t_state_lock, flags);
 481         /*
 482          * Determine if IOCTL context caller in requesting the stopping of this
 483          * command for LUN shutdown purposes.
 484          */
 485         if (cmd->transport_state & CMD_T_LUN_STOP) {
 486                 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
 487                         __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
 488
 489                 cmd->transport_state &= ~CMD_T_ACTIVE;
 490                 if (transport_off == 2)
 491                         target_remove_from_state_list(cmd);
 492                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 493
 494                 complete(&cmd->transport_lun_stop_comp);
 495                 return 1;
 496         }
 497         /*
 498          * Determine if frontend context caller is requesting the stopping of
 499          * this command for frontend exceptions.
 500          */
 501         if (cmd->transport_state & CMD_T_STOP) {
 502                 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
 503                         __func__, __LINE__,
 504                         cmd->se_tfo->get_task_tag(cmd));
 505
 506                 if (transport_off == 2)
 507                         target_remove_from_state_list(cmd);
 508
 509                 /*
 510                  * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
 511                  * to FE.
 512                  */
 513                 if (transport_off == 2)
 514                         cmd->se_lun = NULL;
 515                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 516
 517                 complete(&cmd->t_transport_stop_comp);
 518                 return 1;
 519         }
 520         if (transport_off) {
 521                 cmd->transport_state &= ~CMD_T_ACTIVE;
 522                 if (transport_off == 2) {
 523                         target_remove_from_state_list(cmd);
 524                         /*
 525                          * Clear struct se_cmd->se_lun before the transport_off == 2
 526                          * handoff to fabric module.
 527                          */
 528                         cmd->se_lun = NULL;
 529                         /*
 530                          * Some fabric modules like tcm_loop can release
 531                          * their internally allocated I/O reference now and
 532                          * struct se_cmd now.
 533                          *
 534                          * Fabric modules are expected to return '1' here if the
 535                          * se_cmd being passed is released at this point,
 536                          * or zero if not being released.
 537                          */
 538                         if (cmd->se_tfo->check_stop_free != NULL) {
 539                                 spin_unlock_irqrestore(
 540                                         &cmd->t_state_lock, flags);
 541
 542                                 return cmd->se_tfo->check_stop_free(cmd);
 543                         }
 544                 }
 545                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 546
 547                 return 0;
 548         } else if (t_state)
 549                 cmd->t_state = t_state;
 550         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 551
 552         return 0;
 553 }
 554
 555 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 556 {
 557         return transport_cmd_check_stop(cmd, 2, 0);
 558 }
 559
 560 static void transport_lun_remove_cmd(struct se_cmd *cmd)
 561 {
 562         struct se_lun *lun = cmd->se_lun;
 563         unsigned long flags;
 564
 565         if (!lun)
 566                 return;
 567
 568         spin_lock_irqsave(&cmd->t_state_lock, flags);
 569         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
 570                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
 571                 target_remove_from_state_list(cmd);
 572         }
 573         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 574
 575         spin_lock_irqsave(&lun->lun_cmd_lock, flags);
 576         if (!list_empty(&cmd->se_lun_node))
 577                 list_del_init(&cmd->se_lun_node);
 578         spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
 579 }
 580
 581 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 582 {
 583         if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
 584                 transport_lun_remove_cmd(cmd);
 585
 586         if (transport_cmd_check_stop_to_fabric(cmd))
 587                 return;
 588         if (remove) {
 589                 transport_remove_cmd_from_queue(cmd);
 590                 transport_put_cmd(cmd);
 591         }
 592 }
 593
 594 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
 595                 bool at_head)
 596 {
 597         struct se_device *dev = cmd->se_dev;
 598         struct se_queue_obj *qobj = &dev->dev_queue_obj;
 599         unsigned long flags;
 600
 601         if (t_state) {
 602                 spin_lock_irqsave(&cmd->t_state_lock, flags);
 603                 cmd->t_state = t_state;
 604                 cmd->transport_state |= CMD_T_ACTIVE;
 605                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 606         }
 607
 608         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 609
 610         /* If the cmd is already on the list, remove it before we add it */
 611         if (!list_empty(&cmd->se_queue_node))
 612                 list_del(&cmd->se_queue_node);
 613         else
 614                 atomic_inc(&qobj->queue_cnt);
 615
 616         if (at_head)
 617                 list_add(&cmd->se_queue_node, &qobj->qobj_list);
 618         else
 619                 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
 620         cmd->transport_state |= CMD_T_QUEUED;
 621         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 622
 623         wake_up_interruptible(&qobj->thread_wq);
 624 }
 625
 626 static struct se_cmd *
 627 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
 628 {
 629         struct se_cmd *cmd;
 630         unsigned long flags;
 631
 632         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 633         if (list_empty(&qobj->qobj_list)) {
 634                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 635                 return NULL;
 636         }
 637         cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
 638
 639         cmd->transport_state &= ~CMD_T_QUEUED;
 640         list_del_init(&cmd->se_queue_node);
 641         atomic_dec(&qobj->queue_cnt);
 642         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 643
 644         return cmd;
 645 }
 646
 647 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
 648 {
 649         struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
 650         unsigned long flags;
 651
 652         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 653         if (!(cmd->transport_state & CMD_T_QUEUED)) {
 654                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 655                 return;
 656         }
 657         cmd->transport_state &= ~CMD_T_QUEUED;
 658         atomic_dec(&qobj->queue_cnt);
 659         list_del_init(&cmd->se_queue_node);
 660         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 661 }
 662
 663 static void target_complete_failure_work(struct work_struct *work)
 664 {
 665         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
 666
 667         transport_generic_request_failure(cmd);
 668 }
 669
 670 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
 671 {
 672         struct se_device *dev = cmd->se_dev;
 673         int success = scsi_status == GOOD;
 674         unsigned long flags;
 675
 676         cmd->scsi_status = scsi_status;
 677
 678
 679         spin_lock_irqsave(&cmd->t_state_lock, flags);
 680         cmd->transport_state &= ~CMD_T_BUSY;
 681
 682         if (dev && dev->transport->transport_complete) {
 683                 if (dev->transport->transport_complete(cmd,
 684                                 cmd->t_data_sg) != 0) {
 685                         cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 686                         success = 1;
 687                 }
 688         }
 689
 690         /*
 691          * See if we are waiting to complete for an exception condition.
 692          */
 693         if (cmd->transport_state & CMD_T_REQUEST_STOP) {
 694                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 695                 complete(&cmd->task_stop_comp);
 696                 return;
 697         }
 698
 699         if (!success)
 700                 cmd->transport_state |= CMD_T_FAILED;
 701
 702         /*
 703          * Check for case where an explict ABORT_TASK has been received
 704          * and transport_wait_for_tasks() will be waiting for completion..
 705          */
 706         if (cmd->transport_state & CMD_T_ABORTED &&
 707             cmd->transport_state & CMD_T_STOP) {
 708                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 709                 complete(&cmd->t_transport_stop_comp);
 710                 return;
 711         } else if (cmd->transport_state & CMD_T_FAILED) {
 712                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 713                 INIT_WORK(&cmd->work, target_complete_failure_work);
 714         } else {
 715                 INIT_WORK(&cmd->work, target_complete_ok_work);
 716         }
 717
 718         cmd->t_state = TRANSPORT_COMPLETE;
 719         cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
 720         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 721
 722         queue_work(target_completion_wq, &cmd->work);
 723 }
 724 EXPORT_SYMBOL(target_complete_cmd);
 725
 726 static void target_add_to_state_list(struct se_cmd *cmd)
 727 {
 728         struct se_device *dev = cmd->se_dev;
 729         unsigned long flags;
 730
 731         spin_lock_irqsave(&dev->execute_task_lock, flags);
 732         if (!cmd->state_active) {
 733                 list_add_tail(&cmd->state_list, &dev->state_list);
 734                 cmd->state_active = true;
 735         }
 736         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 737 }
 738
 739 static void __target_add_to_execute_list(struct se_cmd *cmd)
 740 {
 741         struct se_device *dev = cmd->se_dev;
 742         bool head_of_queue = false;
 743
 744         if (!list_empty(&cmd->execute_list))
 745                 return;
 746
 747         if (dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED &&
 748             cmd->sam_task_attr == MSG_HEAD_TAG)
 749                 head_of_queue = true;
 750
 751         if (head_of_queue)
 752                 list_add(&cmd->execute_list, &dev->execute_list);
 753         else
 754                 list_add_tail(&cmd->execute_list, &dev->execute_list);
 755
 756         atomic_inc(&dev->execute_tasks);
 757
 758         if (cmd->state_active)
 759                 return;
 760
 761         if (head_of_queue)
 762                 list_add(&cmd->state_list, &dev->state_list);
 763         else
 764                 list_add_tail(&cmd->state_list, &dev->state_list);
 765
 766         cmd->state_active = true;
 767 }
 768
 769 static void target_add_to_execute_list(struct se_cmd *cmd)
 770 {
 771         unsigned long flags;
 772         struct se_device *dev = cmd->se_dev;
 773
 774         spin_lock_irqsave(&dev->execute_task_lock, flags);
 775         __target_add_to_execute_list(cmd);
 776         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 777 }
 778
 779 void __target_remove_from_execute_list(struct se_cmd *cmd)
 780 {
 781         list_del_init(&cmd->execute_list);
 782         atomic_dec(&cmd->se_dev->execute_tasks);
 783 }
 784
 785 static void target_remove_from_execute_list(struct se_cmd *cmd)
 786 {
 787         struct se_device *dev = cmd->se_dev;
 788         unsigned long flags;
 789
 790         if (WARN_ON(list_empty(&cmd->execute_list)))
 791                 return;
 792
 793         spin_lock_irqsave(&dev->execute_task_lock, flags);
 794         __target_remove_from_execute_list(cmd);
 795         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 796 }
 797
 798 /*
 799  * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
 800  */
 801
 802 static void target_qf_do_work(struct work_struct *work)
 803 {
 804         struct se_device *dev = container_of(work, struct se_device,
 805                                         qf_work_queue);
 806         LIST_HEAD(qf_cmd_list);
 807         struct se_cmd *cmd, *cmd_tmp;
 808
 809         spin_lock_irq(&dev->qf_cmd_lock);
 810         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 811         spin_unlock_irq(&dev->qf_cmd_lock);
 812
 813         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 814                 list_del(&cmd->se_qf_node);
 815                 atomic_dec(&dev->dev_qf_count);
 816                 smp_mb__after_atomic_dec();
 817
 818                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 819                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 820                         (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 821                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 822                         : "UNKNOWN");
 823
 824                 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
 825         }
 826 }
 827
 828 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 829 {
 830         switch (cmd->data_direction) {
 831         case DMA_NONE:
 832                 return "NONE";
 833         case DMA_FROM_DEVICE:
 834                 return "READ";
 835         case DMA_TO_DEVICE:
 836                 return "WRITE";
 837         case DMA_BIDIRECTIONAL:
 838                 return "BIDI";
 839         default:
 840                 break;
 841         }
 842
 843         return "UNKNOWN";
 844 }
 845
 846 void transport_dump_dev_state(
 847         struct se_device *dev,
 848         char *b,
 849         int *bl)
 850 {
 851         *bl += sprintf(b + *bl, "Status: ");
 852         switch (dev->dev_status) {
 853         case TRANSPORT_DEVICE_ACTIVATED:
 854                 *bl += sprintf(b + *bl, "ACTIVATED");
 855                 break;
 856         case TRANSPORT_DEVICE_DEACTIVATED:
 857                 *bl += sprintf(b + *bl, "DEACTIVATED");
 858                 break;
 859         case TRANSPORT_DEVICE_SHUTDOWN:
 860                 *bl += sprintf(b + *bl, "SHUTDOWN");
 861                 break;
 862         case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
 863         case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
 864                 *bl += sprintf(b + *bl, "OFFLINE");
 865                 break;
 866         default:
 867                 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
 868                 break;
 869         }
 870
 871         *bl += sprintf(b + *bl, "  Execute/Max Queue Depth: %d/%d",
 872                 atomic_read(&dev->execute_tasks), dev->queue_depth);
 873         *bl += sprintf(b + *bl, "  SectorSize: %u  HwMaxSectors: %u\n",
 874                 dev->se_sub_dev->se_dev_attrib.block_size,
 875                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
 876         *bl += sprintf(b + *bl, "        ");
 877 }
 878
 879 void transport_dump_vpd_proto_id(
 880         struct t10_vpd *vpd,
 881         unsigned char *p_buf,
 882         int p_buf_len)
 883 {
 884         unsigned char buf[VPD_TMP_BUF_SIZE];
 885         int len;
 886
 887         memset(buf, 0, VPD_TMP_BUF_SIZE);
 888         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
 889
 890         switch (vpd->protocol_identifier) {
 891         case 0x00:
 892                 sprintf(buf+len, "Fibre Channel\n");
 893                 break;
 894         case 0x10:
 895                 sprintf(buf+len, "Parallel SCSI\n");
 896                 break;
 897         case 0x20:
 898                 sprintf(buf+len, "SSA\n");
 899                 break;
 900         case 0x30:
 901                 sprintf(buf+len, "IEEE 1394\n");
 902                 break;
 903         case 0x40:
 904                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
 905                                 " Protocol\n");
 906                 break;
 907         case 0x50:
 908                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
 909                 break;
 910         case 0x60:
 911                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
 912                 break;
 913         case 0x70:
 914                 sprintf(buf+len, "Automation/Drive Interface Transport"
 915                                 " Protocol\n");
 916                 break;
 917         case 0x80:
 918                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
 919                 break;
 920         default:
 921                 sprintf(buf+len, "Unknown 0x%02x\n",
 922                                 vpd->protocol_identifier);
 923                 break;
 924         }
 925
 926         if (p_buf)
 927                 strncpy(p_buf, buf, p_buf_len);
 928         else
 929                 pr_debug("%s", buf);
 930 }
 931
 932 void
 933 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
 934 {
 935         /*
 936          * Check if the Protocol Identifier Valid (PIV) bit is set..
 937          *
 938          * from spc3r23.pdf section 7.5.1
 939          */
 940          if (page_83[1] & 0x80) {
 941                 vpd->protocol_identifier = (page_83[0] & 0xf0);
 942                 vpd->protocol_identifier_set = 1;
 943                 transport_dump_vpd_proto_id(vpd, NULL, 0);
 944         }
 945 }
 946 EXPORT_SYMBOL(transport_set_vpd_proto_id);
 947
 948 int transport_dump_vpd_assoc(
 949         struct t10_vpd *vpd,
 950         unsigned char *p_buf,
 951         int p_buf_len)
 952 {
 953         unsigned char buf[VPD_TMP_BUF_SIZE];
 954         int ret = 0;
 955         int len;
 956
 957         memset(buf, 0, VPD_TMP_BUF_SIZE);
 958         len = sprintf(buf, "T10 VPD Identifier Association: ");
 959
 960         switch (vpd->association) {
 961         case 0x00:
 962                 sprintf(buf+len, "addressed logical unit\n");
 963                 break;
 964         case 0x10:
 965                 sprintf(buf+len, "target port\n");
 966                 break;
 967         case 0x20:
 968                 sprintf(buf+len, "SCSI target device\n");
 969                 break;
 970         default:
 971                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
 972                 ret = -EINVAL;
 973                 break;
 974         }
 975
 976         if (p_buf)
 977                 strncpy(p_buf, buf, p_buf_len);
 978         else
 979                 pr_debug("%s", buf);
 980
 981         return ret;
 982 }
 983
 984 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
 985 {
 986         /*
 987          * The VPD identification association..
 988          *
 989          * from spc3r23.pdf Section 7.6.3.1 Table 297
 990          */
 991         vpd->association = (page_83[1] & 0x30);
 992         return transport_dump_vpd_assoc(vpd, NULL, 0);
 993 }
 994 EXPORT_SYMBOL(transport_set_vpd_assoc);
 995
 996 int transport_dump_vpd_ident_type(
 997         struct t10_vpd *vpd,
 998         unsigned char *p_buf,
 999         int p_buf_len)
1000 {
1001         unsigned char buf[VPD_TMP_BUF_SIZE];
1002         int ret = 0;
1003         int len;
1004
1005         memset(buf, 0, VPD_TMP_BUF_SIZE);
1006         len = sprintf(buf, "T10 VPD Identifier Type: ");
1007
1008         switch (vpd->device_identifier_type) {
1009         case 0x00:
1010                 sprintf(buf+len, "Vendor specific\n");
1011                 break;
1012         case 0x01:
1013                 sprintf(buf+len, "T10 Vendor ID based\n");
1014                 break;
1015         case 0x02:
1016                 sprintf(buf+len, "EUI-64 based\n");
1017                 break;
1018         case 0x03:
1019                 sprintf(buf+len, "NAA\n");
1020                 break;
1021         case 0x04:
1022                 sprintf(buf+len, "Relative target port identifier\n");
1023                 break;
1024         case 0x08:
1025                 sprintf(buf+len, "SCSI name string\n");
1026                 break;
1027         default:
1028                 sprintf(buf+len, "Unsupported: 0x%02x\n",
1029                                 vpd->device_identifier_type);
1030                 ret = -EINVAL;
1031                 break;
1032         }
1033
1034         if (p_buf) {
1035                 if (p_buf_len < strlen(buf)+1)
1036                         return -EINVAL;
1037                 strncpy(p_buf, buf, p_buf_len);
1038         } else {
1039                 pr_debug("%s", buf);
1040         }
1041
1042         return ret;
1043 }
1044
1045 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1046 {
1047         /*
1048          * The VPD identifier type..
1049          *
1050          * from spc3r23.pdf Section 7.6.3.1 Table 298
1051          */
1052         vpd->device_identifier_type = (page_83[1] & 0x0f);
1053         return transport_dump_vpd_ident_type(vpd, NULL, 0);
1054 }
1055 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1056
1057 int transport_dump_vpd_ident(
1058         struct t10_vpd *vpd,
1059         unsigned char *p_buf,
1060         int p_buf_len)
1061 {
1062         unsigned char buf[VPD_TMP_BUF_SIZE];
1063         int ret = 0;
1064
1065         memset(buf, 0, VPD_TMP_BUF_SIZE);
1066
1067         switch (vpd->device_identifier_code_set) {
1068         case 0x01: /* Binary */
1069                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1070                         &vpd->device_identifier[0]);
1071                 break;
1072         case 0x02: /* ASCII */
1073                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1074                         &vpd->device_identifier[0]);
1075                 break;
1076         case 0x03: /* UTF-8 */
1077                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1078                         &vpd->device_identifier[0]);
1079                 break;
1080         default:
1081                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1082                         " 0x%02x", vpd->device_identifier_code_set);
1083                 ret = -EINVAL;
1084                 break;
1085         }
1086
1087         if (p_buf)
1088                 strncpy(p_buf, buf, p_buf_len);
1089         else
1090                 pr_debug("%s", buf);
1091
1092         return ret;
1093 }
1094
1095 int
1096 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1097 {
1098         static const char hex_str[] = "0123456789abcdef";
1099         int j = 0, i = 4; /* offset to start of the identifer */
1100
1101         /*
1102          * The VPD Code Set (encoding)
1103          *
1104          * from spc3r23.pdf Section 7.6.3.1 Table 296
1105          */
1106         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1107         switch (vpd->device_identifier_code_set) {
1108         case 0x01: /* Binary */
1109                 vpd->device_identifier[j++] =
1110                                 hex_str[vpd->device_identifier_type];
1111                 while (i < (4 + page_83[3])) {
1112                         vpd->device_identifier[j++] =
1113                                 hex_str[(page_83[i] & 0xf0) >> 4];
1114                         vpd->device_identifier[j++] =
1115                                 hex_str[page_83[i] & 0x0f];
1116                         i++;
1117                 }
1118                 break;
1119         case 0x02: /* ASCII */
1120         case 0x03: /* UTF-8 */
1121                 while (i < (4 + page_83[3]))
1122                         vpd->device_identifier[j++] = page_83[i++];
1123                 break;
1124         default:
1125                 break;
1126         }
1127
1128         return transport_dump_vpd_ident(vpd, NULL, 0);
1129 }
1130 EXPORT_SYMBOL(transport_set_vpd_ident);
1131
1132 static void core_setup_task_attr_emulation(struct se_device *dev)
1133 {
1134         /*
1135          * If this device is from Target_Core_Mod/pSCSI, disable the
1136          * SAM Task Attribute emulation.
1137          *
1138          * This is currently not available in upsream Linux/SCSI Target
1139          * mode code, and is assumed to be disabled while using TCM/pSCSI.
1140          */
1141         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1142                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1143                 return;
1144         }
1145
1146         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1147         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1148                 " device\n", dev->transport->name,
1149                 dev->transport->get_device_rev(dev));
1150 }
1151
1152 static void scsi_dump_inquiry(struct se_device *dev)
1153 {
1154         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1155         char buf[17];
1156         int i, device_type;
1157         /*
1158          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1159          */
1160         for (i = 0; i < 8; i++)
1161                 if (wwn->vendor[i] >= 0x20)
1162                         buf[i] = wwn->vendor[i];
1163                 else
1164                         buf[i] = ' ';
1165         buf[i] = '\0';
1166         pr_debug("  Vendor: %s\n", buf);
1167
1168         for (i = 0; i < 16; i++)
1169                 if (wwn->model[i] >= 0x20)
1170                         buf[i] = wwn->model[i];
1171                 else
1172                         buf[i] = ' ';
1173         buf[i] = '\0';
1174         pr_debug("  Model: %s\n", buf);
1175
1176         for (i = 0; i < 4; i++)
1177                 if (wwn->revision[i] >= 0x20)
1178                         buf[i] = wwn->revision[i];
1179                 else
1180                         buf[i] = ' ';
1181         buf[i] = '\0';
1182         pr_debug("  Revision: %s\n", buf);
1183
1184         device_type = dev->transport->get_device_type(dev);
1185         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1186         pr_debug("                 ANSI SCSI revision: %02x\n",
1187                                 dev->transport->get_device_rev(dev));
1188 }
1189
1190 struct se_device *transport_add_device_to_core_hba(
1191         struct se_hba *hba,
1192         struct se_subsystem_api *transport,
1193         struct se_subsystem_dev *se_dev,
1194         u32 device_flags,
1195         void *transport_dev,
1196         struct se_dev_limits *dev_limits,
1197         const char *inquiry_prod,
1198         const char *inquiry_rev)
1199 {
1200         int force_pt;
1201         struct se_device  *dev;
1202
1203         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1204         if (!dev) {
1205                 pr_err("Unable to allocate memory for se_dev_t\n");
1206                 return NULL;
1207         }
1208
1209         transport_init_queue_obj(&dev->dev_queue_obj);
1210         dev->dev_flags          = device_flags;
1211         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1212         dev->dev_ptr            = transport_dev;
1213         dev->se_hba             = hba;
1214         dev->se_sub_dev         = se_dev;
1215         dev->transport          = transport;
1216         INIT_LIST_HEAD(&dev->dev_list);
1217         INIT_LIST_HEAD(&dev->dev_sep_list);
1218         INIT_LIST_HEAD(&dev->dev_tmr_list);
1219         INIT_LIST_HEAD(&dev->execute_list);
1220         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1221         INIT_LIST_HEAD(&dev->state_list);
1222         INIT_LIST_HEAD(&dev->qf_cmd_list);
1223         spin_lock_init(&dev->execute_task_lock);
1224         spin_lock_init(&dev->delayed_cmd_lock);
1225         spin_lock_init(&dev->dev_reservation_lock);
1226         spin_lock_init(&dev->dev_status_lock);
1227         spin_lock_init(&dev->se_port_lock);
1228         spin_lock_init(&dev->se_tmr_lock);
1229         spin_lock_init(&dev->qf_cmd_lock);
1230         atomic_set(&dev->dev_ordered_id, 0);
1231
1232         se_dev_set_default_attribs(dev, dev_limits);
1233
1234         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1235         dev->creation_time = get_jiffies_64();
1236         spin_lock_init(&dev->stats_lock);
1237
1238         spin_lock(&hba->device_lock);
1239         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1240         hba->dev_count++;
1241         spin_unlock(&hba->device_lock);
1242         /*
1243          * Setup the SAM Task Attribute emulation for struct se_device
1244          */
1245         core_setup_task_attr_emulation(dev);
1246         /*
1247          * Force PR and ALUA passthrough emulation with internal object use.
1248          */
1249         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1250         /*
1251          * Setup the Reservations infrastructure for struct se_device
1252          */
1253         core_setup_reservations(dev, force_pt);
1254         /*
1255          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1256          */
1257         if (core_setup_alua(dev, force_pt) < 0)
1258                 goto out;
1259
1260         /*
1261          * Startup the struct se_device processing thread
1262          */
1263         dev->process_thread = kthread_run(transport_processing_thread, dev,
1264                                           "LIO_%s", dev->transport->name);
1265         if (IS_ERR(dev->process_thread)) {
1266                 pr_err("Unable to create kthread: LIO_%s\n",
1267                         dev->transport->name);
1268                 goto out;
1269         }
1270         /*
1271          * Setup work_queue for QUEUE_FULL
1272          */
1273         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1274         /*
1275          * Preload the initial INQUIRY const values if we are doing
1276          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1277          * passthrough because this is being provided by the backend LLD.
1278          * This is required so that transport_get_inquiry() copies these
1279          * originals once back into DEV_T10_WWN(dev) for the virtual device
1280          * setup.
1281          */
1282         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1283                 if (!inquiry_prod || !inquiry_rev) {
1284                         pr_err("All non TCM/pSCSI plugins require"
1285                                 " INQUIRY consts\n");
1286                         goto out;
1287                 }
1288
1289                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1290                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1291                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1292         }
1293         scsi_dump_inquiry(dev);
1294
1295         return dev;
1296 out:
1297         kthread_stop(dev->process_thread);
1298
1299         spin_lock(&hba->device_lock);
1300         list_del(&dev->dev_list);
1301         hba->dev_count--;
1302         spin_unlock(&hba->device_lock);
1303
1304         se_release_vpd_for_dev(dev);
1305
1306         kfree(dev);
1307
1308         return NULL;
1309 }
1310 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1311
1312 /*      transport_generic_prepare_cdb():
1313  *
1314  *      Since the Initiator sees iSCSI devices as LUNs,  the SCSI CDB will
1315  *      contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1316  *      The point of this is since we are mapping iSCSI LUNs to
1317  *      SCSI Target IDs having a non-zero LUN in the CDB will throw the
1318  *      devices and HBAs for a loop.
1319  */
1320 static inline void transport_generic_prepare_cdb(
1321         unsigned char *cdb)
1322 {
1323         switch (cdb[0]) {
1324         case READ_10: /* SBC - RDProtect */
1325         case READ_12: /* SBC - RDProtect */
1326         case READ_16: /* SBC - RDProtect */
1327         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1328         case VERIFY: /* SBC - VRProtect */
1329         case VERIFY_16: /* SBC - VRProtect */
1330         case WRITE_VERIFY: /* SBC - VRProtect */
1331         case WRITE_VERIFY_12: /* SBC - VRProtect */
1332         case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1333                 break;
1334         default:
1335                 cdb[1] &= 0x1f; /* clear logical unit number */
1336                 break;
1337         }
1338 }
1339
1340 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1341
1342 /*
1343  * Used by fabric modules containing a local struct se_cmd within their
1344  * fabric dependent per I/O descriptor.
1345  */
1346 void transport_init_se_cmd(
1347         struct se_cmd *cmd,
1348         struct target_core_fabric_ops *tfo,
1349         struct se_session *se_sess,
1350         u32 data_length,
1351         int data_direction,
1352         int task_attr,
1353         unsigned char *sense_buffer)
1354 {
1355         INIT_LIST_HEAD(&cmd->se_lun_node);
1356         INIT_LIST_HEAD(&cmd->se_delayed_node);
1357         INIT_LIST_HEAD(&cmd->se_qf_node);
1358         INIT_LIST_HEAD(&cmd->se_queue_node);
1359         INIT_LIST_HEAD(&cmd->se_cmd_list);
1360         INIT_LIST_HEAD(&cmd->execute_list);
1361         INIT_LIST_HEAD(&cmd->state_list);
1362         init_completion(&cmd->transport_lun_fe_stop_comp);
1363         init_completion(&cmd->transport_lun_stop_comp);
1364         init_completion(&cmd->t_transport_stop_comp);
1365         init_completion(&cmd->cmd_wait_comp);
1366         init_completion(&cmd->task_stop_comp);
1367         spin_lock_init(&cmd->t_state_lock);
1368         cmd->transport_state = CMD_T_DEV_ACTIVE;
1369
1370         cmd->se_tfo = tfo;
1371         cmd->se_sess = se_sess;
1372         cmd->data_length = data_length;
1373         cmd->data_direction = data_direction;
1374         cmd->sam_task_attr = task_attr;
1375         cmd->sense_buffer = sense_buffer;
1376
1377         cmd->state_active = false;
1378 }
1379 EXPORT_SYMBOL(transport_init_se_cmd);
1380
1381 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1382 {
1383         /*
1384          * Check if SAM Task Attribute emulation is enabled for this
1385          * struct se_device storage object
1386          */
1387         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1388                 return 0;
1389
1390         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1391                 pr_debug("SAM Task Attribute ACA"
1392                         " emulation is not supported\n");
1393                 return -EINVAL;
1394         }
1395         /*
1396          * Used to determine when ORDERED commands should go from
1397          * Dormant to Active status.
1398          */
1399         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1400         smp_mb__after_atomic_inc();
1401         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1402                         cmd->se_ordered_id, cmd->sam_task_attr,
1403                         cmd->se_dev->transport->name);
1404         return 0;
1405 }
1406
1407 /*      target_setup_cmd_from_cdb():
1408  *
1409  *      Called from fabric RX Thread.
1410  */
1411 int target_setup_cmd_from_cdb(
1412         struct se_cmd *cmd,
1413         unsigned char *cdb)
1414 {
1415         int ret;
1416
1417         transport_generic_prepare_cdb(cdb);
1418         /*
1419          * Ensure that the received CDB is less than the max (252 + 8) bytes
1420          * for VARIABLE_LENGTH_CMD
1421          */
1422         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1423                 pr_err("Received SCSI CDB with command_size: %d that"
1424                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1425                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1426                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1427                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1428                 return -EINVAL;
1429         }
1430         /*
1431          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1432          * allocate the additional extended CDB buffer now..  Otherwise
1433          * setup the pointer from __t_task_cdb to t_task_cdb.
1434          */
1435         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1436                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1437                                                 GFP_KERNEL);
1438                 if (!cmd->t_task_cdb) {
1439                         pr_err("Unable to allocate cmd->t_task_cdb"
1440                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1441                                 scsi_command_size(cdb),
1442                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1443                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1444                         cmd->scsi_sense_reason =
1445                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1446                         return -ENOMEM;
1447                 }
1448         } else
1449                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1450         /*
1451          * Copy the original CDB into cmd->
1452          */
1453         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1454         /*
1455          * Setup the received CDB based on SCSI defined opcodes and
1456          * perform unit attention, persistent reservations and ALUA
1457          * checks for virtual device backends.  The cmd->t_task_cdb
1458          * pointer is expected to be setup before we reach this point.
1459          */
1460         ret = transport_generic_cmd_sequencer(cmd, cdb);
1461         if (ret < 0)
1462                 return ret;
1463         /*
1464          * Check for SAM Task Attribute Emulation
1465          */
1466         if (transport_check_alloc_task_attr(cmd) < 0) {
1467                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1468                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1469                 return -EINVAL;
1470         }
1471         spin_lock(&cmd->se_lun->lun_sep_lock);
1472         if (cmd->se_lun->lun_sep)
1473                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1474         spin_unlock(&cmd->se_lun->lun_sep_lock);
1475         return 0;
1476 }
1477 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1478
1479 /*
1480  * Used by fabric module frontends to queue tasks directly.
1481  * Many only be used from process context only
1482  */
1483 int transport_handle_cdb_direct(
1484         struct se_cmd *cmd)
1485 {
1486         int ret;
1487
1488         if (!cmd->se_lun) {
1489                 dump_stack();
1490                 pr_err("cmd->se_lun is NULL\n");
1491                 return -EINVAL;
1492         }
1493         if (in_interrupt()) {
1494                 dump_stack();
1495                 pr_err("transport_generic_handle_cdb cannot be called"
1496                                 " from interrupt context\n");
1497                 return -EINVAL;
1498         }
1499         /*
1500          * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
1501          * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1502          * in existing usage to ensure that outstanding descriptors are handled
1503          * correctly during shutdown via transport_wait_for_tasks()
1504          *
1505          * Also, we don't take cmd->t_state_lock here as we only expect
1506          * this to be called for initial descriptor submission.
1507          */
1508         cmd->t_state = TRANSPORT_NEW_CMD;
1509         cmd->transport_state |= CMD_T_ACTIVE;
1510
1511         /*
1512          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1513          * so follow TRANSPORT_NEW_CMD processing thread context usage
1514          * and call transport_generic_request_failure() if necessary..
1515          */
1516         ret = transport_generic_new_cmd(cmd);
1517         if (ret < 0)
1518                 transport_generic_request_failure(cmd);
1519
1520         return 0;
1521 }
1522 EXPORT_SYMBOL(transport_handle_cdb_direct);
1523
1524 /**
1525  * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1526  *
1527  * @se_cmd: command descriptor to submit
1528  * @se_sess: associated se_sess for endpoint
1529  * @cdb: pointer to SCSI CDB
1530  * @sense: pointer to SCSI sense buffer
1531  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1532  * @data_length: fabric expected data transfer length
1533  * @task_addr: SAM task attribute
1534  * @data_dir: DMA data direction
1535  * @flags: flags for command submission from target_sc_flags_tables
1536  *
1537  * This may only be called from process context, and also currently
1538  * assumes internal allocation of fabric payload buffer by target-core.
1539  **/
1540 void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1541                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1542                 u32 data_length, int task_attr, int data_dir, int flags)
1543 {
1544         struct se_portal_group *se_tpg;
1545         int rc;
1546
1547         se_tpg = se_sess->se_tpg;
1548         BUG_ON(!se_tpg);
1549         BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1550         BUG_ON(in_interrupt());
1551         /*
1552          * Initialize se_cmd for target operation.  From this point
1553          * exceptions are handled by sending exception status via
1554          * target_core_fabric_ops->queue_status() callback
1555          */
1556         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1557                                 data_length, data_dir, task_attr, sense);
1558         if (flags & TARGET_SCF_UNKNOWN_SIZE)
1559                 se_cmd->unknown_data_length = 1;
1560         /*
1561          * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1562          * se_sess->sess_cmd_list.  A second kref_get here is necessary
1563          * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1564          * kref_put() to happen during fabric packet acknowledgement.
1565          */
1566         target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1567         /*
1568          * Signal bidirectional data payloads to target-core
1569          */
1570         if (flags & TARGET_SCF_BIDI_OP)
1571                 se_cmd->se_cmd_flags |= SCF_BIDI;
1572         /*
1573          * Locate se_lun pointer and attach it to struct se_cmd
1574          */
1575         if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1576                 transport_send_check_condition_and_sense(se_cmd,
1577                                 se_cmd->scsi_sense_reason, 0);
1578                 target_put_sess_cmd(se_sess, se_cmd);
1579                 return;
1580         }
1581         /*
1582          * Sanitize CDBs via transport_generic_cmd_sequencer() and
1583          * allocate the necessary tasks to complete the received CDB+data
1584          */
1585         rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1586         if (rc != 0) {
1587                 transport_generic_request_failure(se_cmd);
1588                 return;
1589         }
1590
1591         /*
1592          * Check if we need to delay processing because of ALUA
1593          * Active/NonOptimized primary access state..
1594          */
1595         core_alua_check_nonop_delay(se_cmd);
1596
1597         /*
1598          * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1599          * for immediate execution of READs, otherwise wait for
1600          * transport_generic_handle_data() to be called for WRITEs
1601          * when fabric has filled the incoming buffer.
1602          */
1603         transport_handle_cdb_direct(se_cmd);
1604         return;
1605 }
1606 EXPORT_SYMBOL(target_submit_cmd);
1607
1608 static void target_complete_tmr_failure(struct work_struct *work)
1609 {
1610         struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1611
1612         se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1613         se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1614         transport_generic_free_cmd(se_cmd, 0);
1615 }
1616
1617 /**
1618  * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1619  *                     for TMR CDBs
1620  *
1621  * @se_cmd: command descriptor to submit
1622  * @se_sess: associated se_sess for endpoint
1623  * @sense: pointer to SCSI sense buffer
1624  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1625  * @fabric_context: fabric context for TMR req
1626  * @tm_type: Type of TM request
1627  * @gfp: gfp type for caller
1628  * @tag: referenced task tag for TMR_ABORT_TASK
1629  * @flags: submit cmd flags
1630  *
1631  * Callable from all contexts.
1632  **/
1633
1634 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1635                 unsigned char *sense, u32 unpacked_lun,
1636                 void *fabric_tmr_ptr, unsigned char tm_type,
1637                 gfp_t gfp, unsigned int tag, int flags)
1638 {
1639         struct se_portal_group *se_tpg;
1640         int ret;
1641
1642         se_tpg = se_sess->se_tpg;
1643         BUG_ON(!se_tpg);
1644
1645         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1646                               0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1647         /*
1648          * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1649          * allocation failure.
1650          */
1651         ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1652         if (ret < 0)
1653                 return -ENOMEM;
1654
1655         if (tm_type == TMR_ABORT_TASK)
1656                 se_cmd->se_tmr_req->ref_task_tag = tag;
1657
1658         /* See target_submit_cmd for commentary */
1659         target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1660
1661         ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1662         if (ret) {
1663                 /*
1664                  * For callback during failure handling, push this work off
1665                  * to process context with TMR_LUN_DOES_NOT_EXIST status.
1666                  */
1667                 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1668                 schedule_work(&se_cmd->work);
1669                 return 0;
1670         }
1671         transport_generic_handle_tmr(se_cmd);
1672         return 0;
1673 }
1674 EXPORT_SYMBOL(target_submit_tmr);
1675
1676 /*
1677  * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1678  * to  queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1679  * complete setup in TCM process context w/ TFO->new_cmd_map().
1680  */
1681 int transport_generic_handle_cdb_map(
1682         struct se_cmd *cmd)
1683 {
1684         if (!cmd->se_lun) {
1685                 dump_stack();
1686                 pr_err("cmd->se_lun is NULL\n");
1687                 return -EINVAL;
1688         }
1689
1690         transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1691         return 0;
1692 }
1693 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1694
1695 /*      transport_generic_handle_data():
1696  *
1697  *
1698  */
1699 int transport_generic_handle_data(
1700         struct se_cmd *cmd)
1701 {
1702         /*
1703          * For the software fabric case, then we assume the nexus is being
1704          * failed/shutdown when signals are pending from the kthread context
1705          * caller, so we return a failure.  For the HW target mode case running
1706          * in interrupt code, the signal_pending() check is skipped.
1707          */
1708         if (!in_interrupt() && signal_pending(current))
1709                 return -EPERM;
1710         /*
1711          * If the received CDB has aleady been ABORTED by the generic
1712          * target engine, we now call transport_check_aborted_status()
1713          * to queue any delated TASK_ABORTED status for the received CDB to the
1714          * fabric module as we are expecting no further incoming DATA OUT
1715          * sequences at this point.
1716          */
1717         if (transport_check_aborted_status(cmd, 1) != 0)
1718                 return 0;
1719
1720         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1721         return 0;
1722 }
1723 EXPORT_SYMBOL(transport_generic_handle_data);
1724
1725 /*      transport_generic_handle_tmr():
1726  *
1727  *
1728  */
1729 int transport_generic_handle_tmr(
1730         struct se_cmd *cmd)
1731 {
1732         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1733         return 0;
1734 }
1735 EXPORT_SYMBOL(transport_generic_handle_tmr);
1736
1737 /*
1738  * If the cmd is active, request it to be stopped and sleep until it
1739  * has completed.
1740  */
1741 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1742 {
1743         bool was_active = false;
1744
1745         if (cmd->transport_state & CMD_T_BUSY) {
1746                 cmd->transport_state |= CMD_T_REQUEST_STOP;
1747                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1748
1749                 pr_debug("cmd %p waiting to complete\n", cmd);
1750                 wait_for_completion(&cmd->task_stop_comp);
1751                 pr_debug("cmd %p stopped successfully\n", cmd);
1752
1753                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1754                 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1755                 cmd->transport_state &= ~CMD_T_BUSY;
1756                 was_active = true;
1757         }
1758
1759         return was_active;
1760 }
1761
1762 /*
1763  * Handle SAM-esque emulation for generic transport request failures.
1764  */
1765 void transport_generic_request_failure(struct se_cmd *cmd)
1766 {
1767         int ret = 0;
1768
1769         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1770                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1771                 cmd->t_task_cdb[0]);
1772         pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1773                 cmd->se_tfo->get_cmd_state(cmd),
1774                 cmd->t_state, cmd->scsi_sense_reason);
1775         pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1776                 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1777                 (cmd->transport_state & CMD_T_STOP) != 0,
1778                 (cmd->transport_state & CMD_T_SENT) != 0);
1779
1780         /*
1781          * For SAM Task Attribute emulation for failed struct se_cmd
1782          */
1783         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1784                 transport_complete_task_attr(cmd);
1785
1786         switch (cmd->scsi_sense_reason) {
1787         case TCM_NON_EXISTENT_LUN:
1788         case TCM_UNSUPPORTED_SCSI_OPCODE:
1789         case TCM_INVALID_CDB_FIELD:
1790         case TCM_INVALID_PARAMETER_LIST:
1791         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1792         case TCM_UNKNOWN_MODE_PAGE:
1793         case TCM_WRITE_PROTECTED:
1794         case TCM_CHECK_CONDITION_ABORT_CMD:
1795         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1796         case TCM_CHECK_CONDITION_NOT_READY:
1797                 break;
1798         case TCM_RESERVATION_CONFLICT:
1799                 /*
1800                  * No SENSE Data payload for this case, set SCSI Status
1801                  * and queue the response to $FABRIC_MOD.
1802                  *
1803                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1804                  */
1805                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1806                 /*
1807                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1808                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1809                  * CONFLICT STATUS.
1810                  *
1811                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1812                  */
1813                 if (cmd->se_sess &&
1814                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1815                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1816                                 cmd->orig_fe_lun, 0x2C,
1817                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1818
1819                 ret = cmd->se_tfo->queue_status(cmd);
1820                 if (ret == -EAGAIN || ret == -ENOMEM)
1821                         goto queue_full;
1822                 goto check_stop;
1823         default:
1824                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1825                         cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1826                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1827                 break;
1828         }
1829         /*
1830          * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1831          * make the call to transport_send_check_condition_and_sense()
1832          * directly.  Otherwise expect the fabric to make the call to
1833          * transport_send_check_condition_and_sense() after handling
1834          * possible unsoliticied write data payloads.
1835          */
1836         ret = transport_send_check_condition_and_sense(cmd,
1837                         cmd->scsi_sense_reason, 0);
1838         if (ret == -EAGAIN || ret == -ENOMEM)
1839                 goto queue_full;
1840
1841 check_stop:
1842         transport_lun_remove_cmd(cmd);
1843         if (!transport_cmd_check_stop_to_fabric(cmd))
1844                 ;
1845         return;
1846
1847 queue_full:
1848         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1849         transport_handle_queue_full(cmd, cmd->se_dev);
1850 }
1851 EXPORT_SYMBOL(transport_generic_request_failure);
1852
1853 static inline u32 transport_lba_21(unsigned char *cdb)
1854 {
1855         return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1856 }
1857
1858 static inline u32 transport_lba_32(unsigned char *cdb)
1859 {
1860         return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1861 }
1862
1863 static inline unsigned long long transport_lba_64(unsigned char *cdb)
1864 {
1865         unsigned int __v1, __v2;
1866
1867         __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1868         __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1869
1870         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1871 }
1872
1873 /*
1874  * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1875  */
1876 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1877 {
1878         unsigned int __v1, __v2;
1879
1880         __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1881         __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1882
1883         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1884 }
1885
1886 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1887 {
1888         unsigned long flags;
1889
1890         spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1891         se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1892         spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1893 }
1894
1895 /*
1896  * Called from Fabric Module context from transport_execute_tasks()
1897  *
1898  * The return of this function determins if the tasks from struct se_cmd
1899  * get added to the execution queue in transport_execute_tasks(),
1900  * or are added to the delayed or ordered lists here.
1901  */
1902 static inline int transport_execute_task_attr(struct se_cmd *cmd)
1903 {
1904         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1905                 return 1;
1906         /*
1907          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1908          * to allow the passed struct se_cmd list of tasks to the front of the list.
1909          */
1910          if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1911                 pr_debug("Added HEAD_OF_QUEUE for CDB:"
1912                         " 0x%02x, se_ordered_id: %u\n",
1913                         cmd->t_task_cdb[0],
1914                         cmd->se_ordered_id);
1915                 return 1;
1916         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1917                 atomic_inc(&cmd->se_dev->dev_ordered_sync);
1918                 smp_mb__after_atomic_inc();
1919
1920                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
1921                                 " list, se_ordered_id: %u\n",
1922                                 cmd->t_task_cdb[0],
1923                                 cmd->se_ordered_id);
1924                 /*
1925                  * Add ORDERED command to tail of execution queue if
1926                  * no other older commands exist that need to be
1927                  * completed first.
1928                  */
1929                 if (!atomic_read(&cmd->se_dev->simple_cmds))
1930                         return 1;
1931         } else {
1932                 /*
1933                  * For SIMPLE and UNTAGGED Task Attribute commands
1934                  */
1935                 atomic_inc(&cmd->se_dev->simple_cmds);
1936                 smp_mb__after_atomic_inc();
1937         }
1938         /*
1939          * Otherwise if one or more outstanding ORDERED task attribute exist,
1940          * add the dormant task(s) built for the passed struct se_cmd to the
1941          * execution queue and become in Active state for this struct se_device.
1942          */
1943         if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
1944                 /*
1945                  * Otherwise, add cmd w/ tasks to delayed cmd queue that
1946                  * will be drained upon completion of HEAD_OF_QUEUE task.
1947                  */
1948                 spin_lock(&cmd->se_dev->delayed_cmd_lock);
1949                 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
1950                 list_add_tail(&cmd->se_delayed_node,
1951                                 &cmd->se_dev->delayed_cmd_list);
1952                 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
1953
1954                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1955                         " delayed CMD list, se_ordered_id: %u\n",
1956                         cmd->t_task_cdb[0], cmd->sam_task_attr,
1957                         cmd->se_ordered_id);
1958                 /*
1959                  * Return zero to let transport_execute_tasks() know
1960                  * not to add the delayed tasks to the execution list.
1961                  */
1962                 return 0;
1963         }
1964         /*
1965          * Otherwise, no ORDERED task attributes exist..
1966          */
1967         return 1;
1968 }
1969
1970 /*
1971  * Called from fabric module context in transport_generic_new_cmd() and
1972  * transport_generic_process_write()
1973  */
1974 static void transport_execute_tasks(struct se_cmd *cmd)
1975 {
1976         int add_tasks;
1977         struct se_device *se_dev = cmd->se_dev;
1978         /*
1979          * Call transport_cmd_check_stop() to see if a fabric exception
1980          * has occurred that prevents execution.
1981          */
1982         if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
1983                 /*
1984                  * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
1985                  * attribute for the tasks of the received struct se_cmd CDB
1986                  */
1987                 add_tasks = transport_execute_task_attr(cmd);
1988                 if (add_tasks) {
1989                         __transport_execute_tasks(se_dev, cmd);
1990                         return;
1991                 }
1992         }
1993         __transport_execute_tasks(se_dev, NULL);
1994 }
1995
1996 static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
1997 {
1998         int error;
1999         struct se_cmd *cmd = NULL;
2000         unsigned long flags;
2001
2002 check_depth:
2003         spin_lock_irq(&dev->execute_task_lock);
2004         if (new_cmd != NULL)
2005                 __target_add_to_execute_list(new_cmd);
2006
2007         if (list_empty(&dev->execute_list)) {
2008                 spin_unlock_irq(&dev->execute_task_lock);
2009                 return 0;
2010         }
2011         cmd = list_first_entry(&dev->execute_list, struct se_cmd, execute_list);
2012         __target_remove_from_execute_list(cmd);
2013         spin_unlock_irq(&dev->execute_task_lock);
2014
2015         spin_lock_irqsave(&cmd->t_state_lock, flags);
2016         cmd->transport_state |= CMD_T_BUSY;
2017         cmd->transport_state |= CMD_T_SENT;
2018
2019         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2020
2021         if (cmd->execute_cmd)
2022                 error = cmd->execute_cmd(cmd);
2023         else {
2024                 error = dev->transport->execute_cmd(cmd, cmd->t_data_sg,
2025                                 cmd->t_data_nents, cmd->data_direction);
2026         }
2027
2028         if (error != 0) {
2029                 spin_lock_irqsave(&cmd->t_state_lock, flags);
2030                 cmd->transport_state &= ~CMD_T_BUSY;
2031                 cmd->transport_state &= ~CMD_T_SENT;
2032                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2033
2034                 transport_generic_request_failure(cmd);
2035         }
2036
2037         new_cmd = NULL;
2038         goto check_depth;
2039
2040         return 0;
2041 }
2042
2043 static inline u32 transport_get_sectors_6(
2044         unsigned char *cdb,
2045         struct se_cmd *cmd,
2046         int *ret)
2047 {
2048         struct se_device *dev = cmd->se_dev;
2049
2050         /*
2051          * Assume TYPE_DISK for non struct se_device objects.
2052          * Use 8-bit sector value.
2053          */
2054         if (!dev)
2055                 goto type_disk;
2056
2057         /*
2058          * Use 24-bit allocation length for TYPE_TAPE.
2059          */
2060         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2061                 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2062
2063         /*
2064          * Everything else assume TYPE_DISK Sector CDB location.
2065          * Use 8-bit sector value.  SBC-3 says:
2066          *
2067          *   A TRANSFER LENGTH field set to zero specifies that 256
2068          *   logical blocks shall be written.  Any other value
2069          *   specifies the number of logical blocks that shall be
2070          *   written.
2071          */
2072 type_disk:
2073         return cdb[4] ? : 256;
2074 }
2075
2076 static inline u32 transport_get_sectors_10(
2077         unsigned char *cdb,
2078         struct se_cmd *cmd,
2079         int *ret)
2080 {
2081         struct se_device *dev = cmd->se_dev;
2082
2083         /*
2084          * Assume TYPE_DISK for non struct se_device objects.
2085          * Use 16-bit sector value.
2086          */
2087         if (!dev)
2088                 goto type_disk;
2089
2090         /*
2091          * XXX_10 is not defined in SSC, throw an exception
2092          */
2093         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2094                 *ret = -EINVAL;
2095                 return 0;
2096         }
2097
2098         /*
2099          * Everything else assume TYPE_DISK Sector CDB location.
2100          * Use 16-bit sector value.
2101          */
2102 type_disk:
2103         return (u32)(cdb[7] << 8) + cdb[8];
2104 }
2105
2106 static inline u32 transport_get_sectors_12(
2107         unsigned char *cdb,
2108         struct se_cmd *cmd,
2109         int *ret)
2110 {
2111         struct se_device *dev = cmd->se_dev;
2112
2113         /*
2114          * Assume TYPE_DISK for non struct se_device objects.
2115          * Use 32-bit sector value.
2116          */
2117         if (!dev)
2118                 goto type_disk;
2119
2120         /*
2121          * XXX_12 is not defined in SSC, throw an exception
2122          */
2123         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2124                 *ret = -EINVAL;
2125                 return 0;
2126         }
2127
2128         /*
2129          * Everything else assume TYPE_DISK Sector CDB location.
2130          * Use 32-bit sector value.
2131          */
2132 type_disk:
2133         return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2134 }
2135
2136 static inline u32 transport_get_sectors_16(
2137         unsigned char *cdb,
2138         struct se_cmd *cmd,
2139         int *ret)
2140 {
2141         struct se_device *dev = cmd->se_dev;
2142
2143         /*
2144          * Assume TYPE_DISK for non struct se_device objects.
2145          * Use 32-bit sector value.
2146          */
2147         if (!dev)
2148                 goto type_disk;
2149
2150         /*
2151          * Use 24-bit allocation length for TYPE_TAPE.
2152          */
2153         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2154                 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2155
2156 type_disk:
2157         return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2158                     (cdb[12] << 8) + cdb[13];
2159 }
2160
2161 /*
2162  * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2163  */
2164 static inline u32 transport_get_sectors_32(
2165         unsigned char *cdb,
2166         struct se_cmd *cmd,
2167         int *ret)
2168 {
2169         /*
2170          * Assume TYPE_DISK for non struct se_device objects.
2171          * Use 32-bit sector value.
2172          */
2173         return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2174                     (cdb[30] << 8) + cdb[31];
2175
2176 }
2177
2178 static inline u32 transport_get_size(
2179         u32 sectors,
2180         unsigned char *cdb,
2181         struct se_cmd *cmd)
2182 {
2183         struct se_device *dev = cmd->se_dev;
2184
2185         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2186                 if (cdb[1] & 1) { /* sectors */
2187                         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2188                 } else /* bytes */
2189                         return sectors;
2190         }
2191
2192         pr_debug("Returning block_size: %u, sectors: %u == %u for"
2193                 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size,
2194                 sectors, dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2195                 dev->transport->name);
2196
2197         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2198 }
2199
2200 static void transport_xor_callback(struct se_cmd *cmd)
2201 {
2202         unsigned char *buf, *addr;
2203         struct scatterlist *sg;
2204         unsigned int offset;
2205         int i;
2206         int count;
2207         /*
2208          * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2209          *
2210          * 1) read the specified logical block(s);
2211          * 2) transfer logical blocks from the data-out buffer;
2212          * 3) XOR the logical blocks transferred from the data-out buffer with
2213          *    the logical blocks read, storing the resulting XOR data in a buffer;
2214          * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2215          *    blocks transferred from the data-out buffer; and
2216          * 5) transfer the resulting XOR data to the data-in buffer.
2217          */
2218         buf = kmalloc(cmd->data_length, GFP_KERNEL);
2219         if (!buf) {
2220                 pr_err("Unable to allocate xor_callback buf\n");
2221                 return;
2222         }
2223         /*
2224          * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2225          * into the locally allocated *buf
2226          */
2227         sg_copy_to_buffer(cmd->t_data_sg,
2228                           cmd->t_data_nents,
2229                           buf,
2230                           cmd->data_length);
2231
2232         /*
2233          * Now perform the XOR against the BIDI read memory located at
2234          * cmd->t_mem_bidi_list
2235          */
2236
2237         offset = 0;
2238         for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2239                 addr = kmap_atomic(sg_page(sg));
2240                 if (!addr)
2241                         goto out;
2242
2243                 for (i = 0; i < sg->length; i++)
2244                         *(addr + sg->offset + i) ^= *(buf + offset + i);
2245
2246                 offset += sg->length;
2247                 kunmap_atomic(addr);
2248         }
2249
2250 out:
2251         kfree(buf);
2252 }
2253
2254 /*
2255  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2256  */
2257 static int transport_get_sense_data(struct se_cmd *cmd)
2258 {
2259         unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2260         struct se_device *dev = cmd->se_dev;
2261         unsigned long flags;
2262         u32 offset = 0;
2263
2264         WARN_ON(!cmd->se_lun);
2265
2266         if (!dev)
2267                 return 0;
2268
2269         spin_lock_irqsave(&cmd->t_state_lock, flags);
2270         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2271                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2272                 return 0;
2273         }
2274
2275         if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2276                 goto out;
2277
2278         if (!dev->transport->get_sense_buffer) {
2279                 pr_err("dev->transport->get_sense_buffer is NULL\n");
2280                 goto out;
2281         }
2282
2283         sense_buffer = dev->transport->get_sense_buffer(cmd);
2284         if (!sense_buffer) {
2285                 pr_err("ITT 0x%08x cmd %p: Unable to locate"
2286                         " sense buffer for task with sense\n",
2287                         cmd->se_tfo->get_task_tag(cmd), cmd);
2288                 goto out;
2289         }
2290
2291         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2292
2293         offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
2294
2295         memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
2296
2297         /* Automatically padded */
2298         cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
2299
2300         pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
2301                 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
2302         return 0;
2303
2304 out:
2305         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2306         return -1;
2307 }
2308
2309 static inline long long transport_dev_end_lba(struct se_device *dev)
2310 {
2311         return dev->transport->get_blocks(dev) + 1;
2312 }
2313
2314 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2315 {
2316         struct se_device *dev = cmd->se_dev;
2317         u32 sectors;
2318
2319         if (dev->transport->get_device_type(dev) != TYPE_DISK)
2320                 return 0;
2321
2322         sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2323
2324         if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2325                 pr_err("LBA: %llu Sectors: %u exceeds"
2326                         " transport_dev_end_lba(): %llu\n",
2327                         cmd->t_task_lba, sectors,
2328                         transport_dev_end_lba(dev));
2329                 return -EINVAL;
2330         }
2331
2332         return 0;
2333 }
2334
2335 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2336 {
2337         /*
2338          * Determine if the received WRITE_SAME is used to for direct
2339          * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2340          * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2341          * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2342          */
2343         int passthrough = (dev->transport->transport_type ==
2344                                 TRANSPORT_PLUGIN_PHBA_PDEV);
2345
2346         if (!passthrough) {
2347                 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2348                         pr_err("WRITE_SAME PBDATA and LBDATA"
2349                                 " bits not supported for Block Discard"
2350                                 " Emulation\n");
2351                         return -ENOSYS;
2352                 }
2353                 /*
2354                  * Currently for the emulated case we only accept
2355                  * tpws with the UNMAP=1 bit set.
2356                  */
2357                 if (!(flags[0] & 0x08)) {
2358                         pr_err("WRITE_SAME w/o UNMAP bit not"
2359                                 " supported for Block Discard Emulation\n");
2360                         return -ENOSYS;
2361                 }
2362         }
2363
2364         return 0;
2365 }
2366
2367 /*      transport_generic_cmd_sequencer():
2368  *
2369  *      Generic Command Sequencer that should work for most DAS transport
2370  *      drivers.
2371  *
2372  *      Called from target_setup_cmd_from_cdb() in the $FABRIC_MOD
2373  *      RX Thread.
2374  *
2375  *      FIXME: Need to support other SCSI OPCODES where as well.
2376  */
2377 static int transport_generic_cmd_sequencer(
2378         struct se_cmd *cmd,
2379         unsigned char *cdb)
2380 {
2381         struct se_device *dev = cmd->se_dev;
2382         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2383         int ret = 0, sector_ret = 0, passthrough;
2384         u32 sectors = 0, size = 0, pr_reg_type = 0;
2385         u16 service_action;
2386         u8 alua_ascq = 0;
2387         /*
2388          * Check for an existing UNIT ATTENTION condition
2389          */
2390         if (core_scsi3_ua_check(cmd, cdb) < 0) {
2391                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2392                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2393                 return -EINVAL;
2394         }
2395         /*
2396          * Check status of Asymmetric Logical Unit Assignment port
2397          */
2398         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2399         if (ret != 0) {
2400                 /*
2401                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2402                  * The ALUA additional sense code qualifier (ASCQ) is determined
2403                  * by the ALUA primary or secondary access state..
2404                  */
2405                 if (ret > 0) {
2406                         pr_debug("[%s]: ALUA TG Port not available,"
2407                                 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2408                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
2409
2410                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
2411                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2412                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2413                         return -EINVAL;
2414                 }
2415                 goto out_invalid_cdb_field;
2416         }
2417         /*
2418          * Check status for SPC-3 Persistent Reservations
2419          */
2420         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2421                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2422                                         cmd, cdb, pr_reg_type) != 0) {
2423                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2424                         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2425                         cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2426                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2427                         return -EBUSY;
2428                 }
2429                 /*
2430                  * This means the CDB is allowed for the SCSI Initiator port
2431                  * when said port is *NOT* holding the legacy SPC-2 or
2432                  * SPC-3 Persistent Reservation.
2433                  */
2434         }
2435
2436         /*
2437          * If we operate in passthrough mode we skip most CDB emulation and
2438          * instead hand the commands down to the physical SCSI device.
2439          */
2440         passthrough =
2441                 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2442
2443         switch (cdb[0]) {
2444         case READ_6:
2445                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2446                 if (sector_ret)
2447                         goto out_unsupported_cdb;
2448                 size = transport_get_size(sectors, cdb, cmd);
2449                 cmd->t_task_lba = transport_lba_21(cdb);
2450                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2451                 break;
2452         case READ_10:
2453                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2454                 if (sector_ret)
2455                         goto out_unsupported_cdb;
2456                 size = transport_get_size(sectors, cdb, cmd);
2457                 cmd->t_task_lba = transport_lba_32(cdb);
2458                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2459                 break;
2460         case READ_12:
2461                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2462                 if (sector_ret)
2463                         goto out_unsupported_cdb;
2464                 size = transport_get_size(sectors, cdb, cmd);
2465                 cmd->t_task_lba = transport_lba_32(cdb);
2466                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2467                 break;
2468         case READ_16:
2469                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2470                 if (sector_ret)
2471                         goto out_unsupported_cdb;
2472                 size = transport_get_size(sectors, cdb, cmd);
2473                 cmd->t_task_lba = transport_lba_64(cdb);
2474                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2475                 break;
2476         case WRITE_6:
2477                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2478                 if (sector_ret)
2479                         goto out_unsupported_cdb;
2480                 size = transport_get_size(sectors, cdb, cmd);
2481                 cmd->t_task_lba = transport_lba_21(cdb);
2482                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2483                 break;
2484         case WRITE_10:
2485         case WRITE_VERIFY:
2486                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2487                 if (sector_ret)
2488                         goto out_unsupported_cdb;
2489                 size = transport_get_size(sectors, cdb, cmd);
2490                 cmd->t_task_lba = transport_lba_32(cdb);
2491                 if (cdb[1] & 0x8)
2492                         cmd->se_cmd_flags |= SCF_FUA;
2493                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2494                 break;
2495         case WRITE_12:
2496                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2497                 if (sector_ret)
2498                         goto out_unsupported_cdb;
2499                 size = transport_get_size(sectors, cdb, cmd);
2500                 cmd->t_task_lba = transport_lba_32(cdb);
2501                 if (cdb[1] & 0x8)
2502                         cmd->se_cmd_flags |= SCF_FUA;
2503                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2504                 break;
2505         case WRITE_16:
2506                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2507                 if (sector_ret)
2508                         goto out_unsupported_cdb;
2509                 size = transport_get_size(sectors, cdb, cmd);
2510                 cmd->t_task_lba = transport_lba_64(cdb);
2511                 if (cdb[1] & 0x8)
2512                         cmd->se_cmd_flags |= SCF_FUA;
2513                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2514                 break;
2515         case XDWRITEREAD_10:
2516                 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2517                     !(cmd->se_cmd_flags & SCF_BIDI))
2518                         goto out_invalid_cdb_field;
2519                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2520                 if (sector_ret)
2521                         goto out_unsupported_cdb;
2522                 size = transport_get_size(sectors, cdb, cmd);
2523                 cmd->t_task_lba = transport_lba_32(cdb);
2524                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2525
2526                 /*
2527                  * Do now allow BIDI commands for passthrough mode.
2528                  */
2529                 if (passthrough)
2530                         goto out_unsupported_cdb;
2531
2532                 /*
2533                  * Setup BIDI XOR callback to be run after I/O completion.
2534                  */
2535                 cmd->transport_complete_callback = &transport_xor_callback;
2536                 if (cdb[1] & 0x8)
2537                         cmd->se_cmd_flags |= SCF_FUA;
2538                 break;
2539         case VARIABLE_LENGTH_CMD:
2540                 service_action = get_unaligned_be16(&cdb[8]);
2541                 switch (service_action) {
2542                 case XDWRITEREAD_32:
2543                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2544                         if (sector_ret)
2545                                 goto out_unsupported_cdb;
2546                         size = transport_get_size(sectors, cdb, cmd);
2547                         /*
2548                          * Use WRITE_32 and READ_32 opcodes for the emulated
2549                          * XDWRITE_READ_32 logic.
2550                          */
2551                         cmd->t_task_lba = transport_lba_64_ext(cdb);
2552                         cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2553
2554                         /*
2555                          * Do now allow BIDI commands for passthrough mode.
2556                          */
2557                         if (passthrough)
2558                                 goto out_unsupported_cdb;
2559
2560                         /*
2561                          * Setup BIDI XOR callback to be run during after I/O
2562                          * completion.
2563                          */
2564                         cmd->transport_complete_callback = &transport_xor_callback;
2565                         if (cdb[1] & 0x8)
2566                                 cmd->se_cmd_flags |= SCF_FUA;
2567                         break;
2568                 case WRITE_SAME_32:
2569                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2570                         if (sector_ret)
2571                                 goto out_unsupported_cdb;
2572
2573                         if (sectors)
2574                                 size = transport_get_size(1, cdb, cmd);
2575                         else {
2576                                 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2577                                        " supported\n");
2578                                 goto out_invalid_cdb_field;
2579                         }
2580
2581                         cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2582                         cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2583
2584                         if (target_check_write_same_discard(&cdb[10], dev) < 0)
2585                                 goto out_unsupported_cdb;
2586                         if (!passthrough)
2587                                 cmd->execute_cmd = target_emulate_write_same;
2588                         break;
2589                 default:
2590                         pr_err("VARIABLE_LENGTH_CMD service action"
2591                                 " 0x%04x not supported\n", service_action);
2592                         goto out_unsupported_cdb;
2593                 }
2594                 break;
2595         case MAINTENANCE_IN:
2596                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2597                         /* MAINTENANCE_IN from SCC-2 */
2598                         /*
2599                          * Check for emulated MI_REPORT_TARGET_PGS.
2600                          */
2601                         if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS &&
2602                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2603                                 cmd->execute_cmd =
2604                                         target_emulate_report_target_port_groups;
2605                         }
2606                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2607                                (cdb[8] << 8) | cdb[9];
2608                 } else {
2609                         /* GPCMD_SEND_KEY from multi media commands */
2610                         size = (cdb[8] << 8) + cdb[9];
2611                 }
2612                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2613                 break;
2614         case MODE_SELECT:
2615                 size = cdb[4];
2616                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2617                 break;
2618         case MODE_SELECT_10:
2619                 size = (cdb[7] << 8) + cdb[8];
2620                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2621                 break;
2622         case MODE_SENSE:
2623                 size = cdb[4];
2624                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2625                 if (!passthrough)
2626                         cmd->execute_cmd = target_emulate_modesense;
2627                 break;
2628         case MODE_SENSE_10:
2629                 size = (cdb[7] << 8) + cdb[8];
2630                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2631                 if (!passthrough)
2632                         cmd->execute_cmd = target_emulate_modesense;
2633                 break;
2634         case GPCMD_READ_BUFFER_CAPACITY:
2635         case GPCMD_SEND_OPC:
2636         case LOG_SELECT:
2637         case LOG_SENSE:
2638                 size = (cdb[7] << 8) + cdb[8];
2639                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2640                 break;
2641         case READ_BLOCK_LIMITS:
2642                 size = READ_BLOCK_LEN;
2643                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2644                 break;
2645         case GPCMD_GET_CONFIGURATION:
2646         case GPCMD_READ_FORMAT_CAPACITIES:
2647         case GPCMD_READ_DISC_INFO:
2648         case GPCMD_READ_TRACK_RZONE_INFO:
2649                 size = (cdb[7] << 8) + cdb[8];
2650                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2651                 break;
2652         case PERSISTENT_RESERVE_IN:
2653                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2654                         cmd->execute_cmd = target_scsi3_emulate_pr_in;
2655                 size = (cdb[7] << 8) + cdb[8];
2656                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2657                 break;
2658         case PERSISTENT_RESERVE_OUT:
2659                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2660                         cmd->execute_cmd = target_scsi3_emulate_pr_out;
2661                 size = (cdb[7] << 8) + cdb[8];
2662                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2663                 break;
2664         case GPCMD_MECHANISM_STATUS:
2665         case GPCMD_READ_DVD_STRUCTURE:
2666                 size = (cdb[8] << 8) + cdb[9];
2667                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2668                 break;
2669         case READ_POSITION:
2670                 size = READ_POSITION_LEN;
2671                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2672                 break;
2673         case MAINTENANCE_OUT:
2674                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2675                         /* MAINTENANCE_OUT from SCC-2
2676                          *
2677                          * Check for emulated MO_SET_TARGET_PGS.
2678                          */
2679                         if (cdb[1] == MO_SET_TARGET_PGS &&
2680                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2681                                 cmd->execute_cmd =
2682                                         target_emulate_set_target_port_groups;
2683                         }
2684
2685                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2686                                (cdb[8] << 8) | cdb[9];
2687                 } else  {
2688                         /* GPCMD_REPORT_KEY from multi media commands */
2689                         size = (cdb[8] << 8) + cdb[9];
2690                 }
2691                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2692                 break;
2693         case INQUIRY:
2694                 size = (cdb[3] << 8) + cdb[4];
2695                 /*
2696                  * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2697                  * See spc4r17 section 5.3
2698                  */
2699                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2700                         cmd->sam_task_attr = MSG_HEAD_TAG;
2701                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2702                 if (!passthrough)
2703                         cmd->execute_cmd = target_emulate_inquiry;
2704                 break;
2705         case READ_BUFFER:
2706                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2707                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2708                 break;
2709         case READ_CAPACITY:
2710                 size = READ_CAP_LEN;
2711                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2712                 if (!passthrough)
2713                         cmd->execute_cmd = target_emulate_readcapacity;
2714                 break;
2715         case READ_MEDIA_SERIAL_NUMBER:
2716         case SECURITY_PROTOCOL_IN:
2717         case SECURITY_PROTOCOL_OUT:
2718                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2719                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2720                 break;
2721         case SERVICE_ACTION_IN:
2722                 switch (cmd->t_task_cdb[1] & 0x1f) {
2723                 case SAI_READ_CAPACITY_16:
2724                         if (!passthrough)
2725                                 cmd->execute_cmd =
2726                                         target_emulate_readcapacity_16;
2727                         break;
2728                 default:
2729                         if (passthrough)
2730                                 break;
2731
2732                         pr_err("Unsupported SA: 0x%02x\n",
2733                                 cmd->t_task_cdb[1] & 0x1f);
2734                         goto out_invalid_cdb_field;
2735                 }
2736                 /*FALLTHROUGH*/
2737         case ACCESS_CONTROL_IN:
2738         case ACCESS_CONTROL_OUT:
2739         case EXTENDED_COPY:
2740         case READ_ATTRIBUTE:
2741         case RECEIVE_COPY_RESULTS:
2742         case WRITE_ATTRIBUTE:
2743                 size = (cdb[10] << 24) | (cdb[11] << 16) |
2744                        (cdb[12] << 8) | cdb[13];
2745                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2746                 break;
2747         case RECEIVE_DIAGNOSTIC:
2748         case SEND_DIAGNOSTIC:
2749                 size = (cdb[3] << 8) | cdb[4];
2750                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2751                 break;
2752 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2753 #if 0
2754         case GPCMD_READ_CD:
2755                 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2756                 size = (2336 * sectors);
2757                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2758                 break;
2759 #endif
2760         case READ_TOC:
2761                 size = cdb[8];
2762                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2763                 break;
2764         case REQUEST_SENSE:
2765                 size = cdb[4];
2766                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2767                 if (!passthrough)
2768                         cmd->execute_cmd = target_emulate_request_sense;
2769                 break;
2770         case READ_ELEMENT_STATUS:
2771                 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
2772                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2773                 break;
2774         case WRITE_BUFFER:
2775                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2776                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2777                 break;
2778         case RESERVE:
2779         case RESERVE_10:
2780                 /*
2781                  * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2782                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2783                  */
2784                 if (cdb[0] == RESERVE_10)
2785                         size = (cdb[7] << 8) | cdb[8];
2786                 else
2787                         size = cmd->data_length;
2788
2789                 /*
2790                  * Setup the legacy emulated handler for SPC-2 and
2791                  * >= SPC-3 compatible reservation handling (CRH=1)
2792                  * Otherwise, we assume the underlying SCSI logic is
2793                  * is running in SPC_PASSTHROUGH, and wants reservations
2794                  * emulation disabled.
2795                  */
2796                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2797                         cmd->execute_cmd = target_scsi2_reservation_reserve;
2798                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2799                 break;
2800         case RELEASE:
2801         case RELEASE_10:
2802                 /*
2803                  * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2804                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2805                 */
2806                 if (cdb[0] == RELEASE_10)
2807                         size = (cdb[7] << 8) | cdb[8];
2808                 else
2809                         size = cmd->data_length;
2810
2811                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2812                         cmd->execute_cmd = target_scsi2_reservation_release;
2813                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2814                 break;
2815         case SYNCHRONIZE_CACHE:
2816         case SYNCHRONIZE_CACHE_16:
2817                 /*
2818                  * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2819                  */
2820                 if (cdb[0] == SYNCHRONIZE_CACHE) {
2821                         sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2822                         cmd->t_task_lba = transport_lba_32(cdb);
2823                 } else {
2824                         sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2825                         cmd->t_task_lba = transport_lba_64(cdb);
2826                 }
2827                 if (sector_ret)
2828                         goto out_unsupported_cdb;
2829
2830                 size = transport_get_size(sectors, cdb, cmd);
2831                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2832
2833                 if (passthrough)
2834                         break;
2835
2836                 /*
2837                  * Check to ensure that LBA + Range does not exceed past end of
2838                  * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
2839                  */
2840                 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2841                         if (transport_cmd_get_valid_sectors(cmd) < 0)
2842                                 goto out_invalid_cdb_field;
2843                 }
2844                 cmd->execute_cmd = target_emulate_synchronize_cache;
2845                 break;
2846         case UNMAP:
2847                 size = get_unaligned_be16(&cdb[7]);
2848                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2849                 if (!passthrough)
2850                         cmd->execute_cmd = target_emulate_unmap;
2851                 break;
2852         case WRITE_SAME_16:
2853                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2854                 if (sector_ret)
2855                         goto out_unsupported_cdb;
2856
2857                 if (sectors)
2858                         size = transport_get_size(1, cdb, cmd);
2859                 else {
2860                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2861                         goto out_invalid_cdb_field;
2862                 }
2863
2864                 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
2865                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2866
2867                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2868                         goto out_unsupported_cdb;
2869                 if (!passthrough)
2870                         cmd->execute_cmd = target_emulate_write_same;
2871                 break;
2872         case WRITE_SAME:
2873                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2874                 if (sector_ret)
2875                         goto out_unsupported_cdb;
2876
2877                 if (sectors)
2878                         size = transport_get_size(1, cdb, cmd);
2879                 else {
2880                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2881                         goto out_invalid_cdb_field;
2882                 }
2883
2884                 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
2885                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2886                 /*
2887                  * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2888                  * of byte 1 bit 3 UNMAP instead of original reserved field
2889                  */
2890                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2891                         goto out_unsupported_cdb;
2892                 if (!passthrough)
2893                         cmd->execute_cmd = target_emulate_write_same;
2894                 break;
2895         case ALLOW_MEDIUM_REMOVAL:
2896         case ERASE:
2897         case REZERO_UNIT:
2898         case SEEK_10:
2899         case SPACE:
2900         case START_STOP:
2901         case TEST_UNIT_READY:
2902         case VERIFY:
2903         case WRITE_FILEMARKS:
2904                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2905                 if (!passthrough)
2906                         cmd->execute_cmd = target_emulate_noop;
2907                 break;
2908         case GPCMD_CLOSE_TRACK:
2909         case INITIALIZE_ELEMENT_STATUS:
2910         case GPCMD_LOAD_UNLOAD:
2911         case GPCMD_SET_SPEED:
2912         case MOVE_MEDIUM:
2913                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2914                 break;
2915         case REPORT_LUNS:
2916                 cmd->execute_cmd = target_report_luns;
2917                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2918                 /*
2919                  * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
2920                  * See spc4r17 section 5.3
2921                  */
2922                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2923                         cmd->sam_task_attr = MSG_HEAD_TAG;
2924                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2925                 break;
2926         case GET_EVENT_STATUS_NOTIFICATION:
2927                 size = (cdb[7] << 8) | cdb[8];
2928                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2929                 break;
2930         case ATA_16:
2931                 /* Only support ATA passthrough to pSCSI backends.. */
2932                 if (!passthrough)
2933                         goto out_unsupported_cdb;
2934
2935                 /* T_LENGTH */
2936                 switch (cdb[2] & 0x3) {
2937                 case 0x0:
2938                         sectors = 0;
2939                         break;
2940                 case 0x1:
2941                         sectors = (((cdb[1] & 0x1) ? cdb[3] : 0) << 8) | cdb[4];
2942                         break;
2943                 case 0x2:
2944                         sectors = (((cdb[1] & 0x1) ? cdb[5] : 0) << 8) | cdb[6];
2945                         break;
2946                 case 0x3:
2947                         pr_err("T_LENGTH=0x3 not supported for ATA_16\n");
2948                         goto out_invalid_cdb_field;
2949                 }
2950
2951                 /* BYTE_BLOCK */
2952                 if (cdb[2] & 0x4) {
2953                         /* BLOCK T_TYPE: 512 or sector */
2954                         size = sectors * ((cdb[2] & 0x10) ?
2955                                 dev->se_sub_dev->se_dev_attrib.block_size : 512);
2956                 } else {
2957                         /* BYTE */
2958                         size = sectors;
2959                 }
2960                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2961                 break;
2962         default:
2963                 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
2964                         " 0x%02x, sending CHECK_CONDITION.\n",
2965                         cmd->se_tfo->get_fabric_name(), cdb[0]);
2966                 goto out_unsupported_cdb;
2967         }
2968
2969         if (cmd->unknown_data_length)
2970                 cmd->data_length = size;
2971
2972         if (size != cmd->data_length) {
2973                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
2974                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
2975                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
2976                                 cmd->data_length, size, cdb[0]);
2977
2978                 cmd->cmd_spdtl = size;
2979
2980                 if (cmd->data_direction == DMA_TO_DEVICE) {
2981                         pr_err("Rejecting underflow/overflow"
2982                                         " WRITE data\n");
2983                         goto out_invalid_cdb_field;
2984                 }
2985                 /*
2986                  * Reject READ_* or WRITE_* with overflow/underflow for
2987                  * type SCF_SCSI_DATA_SG_IO_CDB.
2988                  */
2989                 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512))  {
2990                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
2991                                 " CDB on non 512-byte sector setup subsystem"
2992                                 " plugin: %s\n", dev->transport->name);
2993                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
2994                         goto out_invalid_cdb_field;
2995                 }
2996
2997                 if (size > cmd->data_length) {
2998                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
2999                         cmd->residual_count = (size - cmd->data_length);
3000                 } else {
3001                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3002                         cmd->residual_count = (cmd->data_length - size);
3003                 }
3004                 cmd->data_length = size;
3005         }
3006
3007         if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3008                 if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) {
3009                         printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
3010                                 " big sectors %u exceeds fabric_max_sectors:"
3011                                 " %u\n", cdb[0], sectors,
3012                                 su_dev->se_dev_attrib.fabric_max_sectors);
3013                         goto out_invalid_cdb_field;
3014                 }
3015                 if (sectors > su_dev->se_dev_attrib.hw_max_sectors) {
3016                         printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
3017                                 " big sectors %u exceeds backend hw_max_sectors:"
3018                                 " %u\n", cdb[0], sectors,
3019                                 su_dev->se_dev_attrib.hw_max_sectors);
3020                         goto out_invalid_cdb_field;
3021                 }
3022         }
3023
3024         /* reject any command that we don't have a handler for */
3025         if (!(passthrough || cmd->execute_cmd ||
3026              (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3027                 goto out_unsupported_cdb;
3028
3029         transport_set_supported_SAM_opcode(cmd);
3030         return ret;
3031
3032 out_unsupported_cdb:
3033         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3034         cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3035         return -EINVAL;
3036 out_invalid_cdb_field:
3037         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3038         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3039         return -EINVAL;
3040 }
3041
3042 /*
3043  * Called from I/O completion to determine which dormant/delayed
3044  * and ordered cmds need to have their tasks added to the execution queue.
3045  */
3046 static void transport_complete_task_attr(struct se_cmd *cmd)
3047 {
3048         struct se_device *dev = cmd->se_dev;
3049         struct se_cmd *cmd_p, *cmd_tmp;
3050         int new_active_tasks = 0;
3051
3052         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3053                 atomic_dec(&dev->simple_cmds);
3054                 smp_mb__after_atomic_dec();
3055                 dev->dev_cur_ordered_id++;
3056                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3057                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3058                         cmd->se_ordered_id);
3059         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3060                 dev->dev_cur_ordered_id++;
3061                 pr_debug("Incremented dev_cur_ordered_id: %u for"
3062                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3063                         cmd->se_ordered_id);
3064         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3065                 atomic_dec(&dev->dev_ordered_sync);
3066                 smp_mb__after_atomic_dec();
3067
3068                 dev->dev_cur_ordered_id++;
3069                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3070                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3071         }
3072         /*
3073          * Process all commands up to the last received
3074          * ORDERED task attribute which requires another blocking
3075          * boundary
3076          */
3077         spin_lock(&dev->delayed_cmd_lock);
3078         list_for_each_entry_safe(cmd_p, cmd_tmp,
3079                         &dev->delayed_cmd_list, se_delayed_node) {
3080
3081                 list_del(&cmd_p->se_delayed_node);
3082                 spin_unlock(&dev->delayed_cmd_lock);
3083
3084                 pr_debug("Calling add_tasks() for"
3085                         " cmd_p: 0x%02x Task Attr: 0x%02x"
3086                         " Dormant -> Active, se_ordered_id: %u\n",
3087                         cmd_p->t_task_cdb[0],
3088                         cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3089
3090                 target_add_to_execute_list(cmd_p);
3091                 new_active_tasks++;
3092
3093                 spin_lock(&dev->delayed_cmd_lock);
3094                 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3095                         break;
3096         }
3097         spin_unlock(&dev->delayed_cmd_lock);
3098         /*
3099          * If new tasks have become active, wake up the transport thread
3100          * to do the processing of the Active tasks.
3101          */
3102         if (new_active_tasks != 0)
3103                 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3104 }
3105
3106 static void transport_complete_qf(struct se_cmd *cmd)
3107 {
3108         int ret = 0;
3109
3110         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3111                 transport_complete_task_attr(cmd);
3112
3113         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3114                 ret = cmd->se_tfo->queue_status(cmd);
3115                 if (ret)
3116                         goto out;
3117         }
3118
3119         switch (cmd->data_direction) {
3120         case DMA_FROM_DEVICE:
3121                 ret = cmd->se_tfo->queue_data_in(cmd);
3122                 break;
3123         case DMA_TO_DEVICE:
3124                 if (cmd->t_bidi_data_sg) {
3125                         ret = cmd->se_tfo->queue_data_in(cmd);
3126                         if (ret < 0)
3127                                 break;
3128                 }
3129                 /* Fall through for DMA_TO_DEVICE */
3130         case DMA_NONE:
3131                 ret = cmd->se_tfo->queue_status(cmd);
3132                 break;
3133         default:
3134                 break;
3135         }
3136
3137 out:
3138         if (ret < 0) {
3139                 transport_handle_queue_full(cmd, cmd->se_dev);
3140                 return;
3141         }
3142         transport_lun_remove_cmd(cmd);
3143         transport_cmd_check_stop_to_fabric(cmd);
3144 }
3145
3146 static void transport_handle_queue_full(
3147         struct se_cmd *cmd,
3148         struct se_device *dev)
3149 {
3150         spin_lock_irq(&dev->qf_cmd_lock);
3151         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3152         atomic_inc(&dev->dev_qf_count);
3153         smp_mb__after_atomic_inc();
3154         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3155
3156         schedule_work(&cmd->se_dev->qf_work_queue);
3157 }
3158
3159 static void target_complete_ok_work(struct work_struct *work)
3160 {
3161         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3162         int reason = 0, ret;
3163
3164         /*
3165          * Check if we need to move delayed/dormant tasks from cmds on the
3166          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3167          * Attribute.
3168          */
3169         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3170                 transport_complete_task_attr(cmd);
3171         /*
3172          * Check to schedule QUEUE_FULL work, or execute an existing
3173          * cmd->transport_qf_callback()
3174          */
3175         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3176                 schedule_work(&cmd->se_dev->qf_work_queue);
3177
3178         /*
3179          * Check if we need to retrieve a sense buffer from
3180          * the struct se_cmd in question.
3181          */
3182         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3183                 if (transport_get_sense_data(cmd) < 0)
3184                         reason = TCM_NON_EXISTENT_LUN;
3185
3186                 if (cmd->scsi_status) {
3187                         ret = transport_send_check_condition_and_sense(
3188                                         cmd, reason, 1);
3189                         if (ret == -EAGAIN || ret == -ENOMEM)
3190                                 goto queue_full;
3191
3192                         transport_lun_remove_cmd(cmd);
3193                         transport_cmd_check_stop_to_fabric(cmd);
3194                         return;
3195                 }
3196         }
3197         /*
3198          * Check for a callback, used by amongst other things
3199          * XDWRITE_READ_10 emulation.
3200          */
3201         if (cmd->transport_complete_callback)
3202                 cmd->transport_complete_callback(cmd);
3203
3204         switch (cmd->data_direction) {
3205         case DMA_FROM_DEVICE:
3206                 spin_lock(&cmd->se_lun->lun_sep_lock);
3207                 if (cmd->se_lun->lun_sep) {
3208                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3209                                         cmd->data_length;
3210                 }
3211                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3212
3213                 ret = cmd->se_tfo->queue_data_in(cmd);
3214                 if (ret == -EAGAIN || ret == -ENOMEM)
3215                         goto queue_full;
3216                 break;
3217         case DMA_TO_DEVICE:
3218                 spin_lock(&cmd->se_lun->lun_sep_lock);
3219                 if (cmd->se_lun->lun_sep) {
3220                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3221                                 cmd->data_length;
3222                 }
3223                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3224                 /*
3225                  * Check if we need to send READ payload for BIDI-COMMAND
3226                  */
3227                 if (cmd->t_bidi_data_sg) {
3228                         spin_lock(&cmd->se_lun->lun_sep_lock);
3229                         if (cmd->se_lun->lun_sep) {
3230                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3231                                         cmd->data_length;
3232                         }
3233                         spin_unlock(&cmd->se_lun->lun_sep_lock);
3234                         ret = cmd->se_tfo->queue_data_in(cmd);
3235                         if (ret == -EAGAIN || ret == -ENOMEM)
3236                                 goto queue_full;
3237                         break;
3238                 }
3239                 /* Fall through for DMA_TO_DEVICE */
3240         case DMA_NONE:
3241                 ret = cmd->se_tfo->queue_status(cmd);
3242                 if (ret == -EAGAIN || ret == -ENOMEM)
3243                         goto queue_full;
3244                 break;
3245         default:
3246                 break;
3247         }
3248
3249         transport_lun_remove_cmd(cmd);
3250         transport_cmd_check_stop_to_fabric(cmd);
3251         return;
3252
3253 queue_full:
3254         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3255                 " data_direction: %d\n", cmd, cmd->data_direction);
3256         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3257         transport_handle_queue_full(cmd, cmd->se_dev);
3258 }
3259
3260 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3261 {
3262         struct scatterlist *sg;
3263         int count;
3264
3265         for_each_sg(sgl, sg, nents, count)
3266                 __free_page(sg_page(sg));
3267
3268         kfree(sgl);
3269 }
3270
3271 static inline void transport_free_pages(struct se_cmd *cmd)
3272 {
3273         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3274                 return;
3275
3276         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3277         cmd->t_data_sg = NULL;
3278         cmd->t_data_nents = 0;
3279
3280         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3281         cmd->t_bidi_data_sg = NULL;
3282         cmd->t_bidi_data_nents = 0;
3283 }
3284
3285 /**
3286  * transport_release_cmd - free a command
3287  * @cmd:       command to free
3288  *
3289  * This routine unconditionally frees a command, and reference counting
3290  * or list removal must be done in the caller.
3291  */
3292 static void transport_release_cmd(struct se_cmd *cmd)
3293 {
3294         BUG_ON(!cmd->se_tfo);
3295
3296         if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
3297                 core_tmr_release_req(cmd->se_tmr_req);
3298         if (cmd->t_task_cdb != cmd->__t_task_cdb)
3299                 kfree(cmd->t_task_cdb);
3300         /*
3301          * If this cmd has been setup with target_get_sess_cmd(), drop
3302          * the kref and call ->release_cmd() in kref callback.
3303          */
3304          if (cmd->check_release != 0) {
3305                 target_put_sess_cmd(cmd->se_sess, cmd);
3306                 return;
3307         }
3308         cmd->se_tfo->release_cmd(cmd);
3309 }
3310
3311 /**
3312  * transport_put_cmd - release a reference to a command
3313  * @cmd:       command to release
3314  *
3315  * This routine releases our reference to the command and frees it if possible.
3316  */
3317 static void transport_put_cmd(struct se_cmd *cmd)
3318 {
3319         unsigned long flags;
3320
3321         spin_lock_irqsave(&cmd->t_state_lock, flags);
3322         if (atomic_read(&cmd->t_fe_count)) {
3323                 if (!atomic_dec_and_test(&cmd->t_fe_count))
3324                         goto out_busy;
3325         }
3326
3327         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
3328                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
3329                 target_remove_from_state_list(cmd);
3330         }
3331         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3332
3333         transport_free_pages(cmd);
3334         transport_release_cmd(cmd);
3335         return;
3336 out_busy:
3337         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3338 }
3339
3340 /*
3341  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3342  * allocating in the core.
3343  * @cmd:  Associated se_cmd descriptor
3344  * @mem:  SGL style memory for TCM WRITE / READ
3345  * @sg_mem_num: Number of SGL elements
3346  * @mem_bidi_in: SGL style memory for TCM BIDI READ
3347  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3348  *
3349  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3350  * of parameters.
3351  */
3352 int transport_generic_map_mem_to_cmd(
3353         struct se_cmd *cmd,
3354         struct scatterlist *sgl,
3355         u32 sgl_count,
3356         struct scatterlist *sgl_bidi,
3357         u32 sgl_bidi_count)
3358 {
3359         if (!sgl || !sgl_count)
3360                 return 0;
3361
3362         if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3363             (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3364                 /*
3365                  * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3366                  * scatterlists already have been set to follow what the fabric
3367                  * passes for the original expected data transfer length.
3368                  */
3369                 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3370                         pr_warn("Rejecting SCSI DATA overflow for fabric using"
3371                                 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3372                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3373                         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3374                         return -EINVAL;
3375                 }
3376
3377                 cmd->t_data_sg = sgl;
3378                 cmd->t_data_nents = sgl_count;
3379
3380                 if (sgl_bidi && sgl_bidi_count) {
3381                         cmd->t_bidi_data_sg = sgl_bidi;
3382                         cmd->t_bidi_data_nents = sgl_bidi_count;
3383                 }
3384                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3385         }
3386
3387         return 0;
3388 }
3389 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3390
3391 void *transport_kmap_data_sg(struct se_cmd *cmd)
3392 {
3393         struct scatterlist *sg = cmd->t_data_sg;
3394         struct page **pages;
3395         int i;
3396
3397         BUG_ON(!sg);
3398         /*
3399          * We need to take into account a possible offset here for fabrics like
3400          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3401          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3402          */
3403         if (!cmd->t_data_nents)
3404                 return NULL;
3405         else if (cmd->t_data_nents == 1)
3406                 return kmap(sg_page(sg)) + sg->offset;
3407
3408         /* >1 page. use vmap */
3409         pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3410         if (!pages)
3411                 return NULL;
3412
3413         /* convert sg[] to pages[] */
3414         for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
3415                 pages[i] = sg_page(sg);
3416         }
3417
3418         cmd->t_data_vmap = vmap(pages, cmd->t_data_nents,  VM_MAP, PAGE_KERNEL);
3419         kfree(pages);
3420         if (!cmd->t_data_vmap)
3421                 return NULL;
3422
3423         return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
3424 }
3425 EXPORT_SYMBOL(transport_kmap_data_sg);
3426
3427 void transport_kunmap_data_sg(struct se_cmd *cmd)
3428 {
3429         if (!cmd->t_data_nents) {
3430                 return;
3431         } else if (cmd->t_data_nents == 1) {
3432                 kunmap(sg_page(cmd->t_data_sg));
3433                 return;
3434         }
3435
3436         vunmap(cmd->t_data_vmap);
3437         cmd->t_data_vmap = NULL;
3438 }
3439 EXPORT_SYMBOL(transport_kunmap_data_sg);
3440
3441 static int
3442 transport_generic_get_mem(struct se_cmd *cmd)
3443 {
3444         u32 length = cmd->data_length;
3445         unsigned int nents;
3446         struct page *page;
3447         gfp_t zero_flag;
3448         int i = 0;
3449
3450         nents = DIV_ROUND_UP(length, PAGE_SIZE);
3451         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3452         if (!cmd->t_data_sg)
3453                 return -ENOMEM;
3454
3455         cmd->t_data_nents = nents;
3456         sg_init_table(cmd->t_data_sg, nents);
3457
3458         zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
3459
3460         while (length) {
3461                 u32 page_len = min_t(u32, length, PAGE_SIZE);
3462                 page = alloc_page(GFP_KERNEL | zero_flag);
3463                 if (!page)
3464                         goto out;
3465
3466                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3467                 length -= page_len;
3468                 i++;
3469         }
3470         return 0;
3471
3472 out:
3473         while (i >= 0) {
3474                 __free_page(sg_page(&cmd->t_data_sg[i]));
3475                 i--;
3476         }
3477         kfree(cmd->t_data_sg);
3478         cmd->t_data_sg = NULL;
3479         return -ENOMEM;
3480 }
3481
3482 /*
3483  * Allocate any required resources to execute the command.  For writes we
3484  * might not have the payload yet, so notify the fabric via a call to
3485  * ->write_pending instead. Otherwise place it on the execution queue.
3486  */
3487 int transport_generic_new_cmd(struct se_cmd *cmd)
3488 {
3489         struct se_device *dev = cmd->se_dev;
3490         int ret = 0;
3491
3492         /*
3493          * Determine is the TCM fabric module has already allocated physical
3494          * memory, and is directly calling transport_generic_map_mem_to_cmd()
3495          * beforehand.
3496          */
3497         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3498             cmd->data_length) {
3499                 ret = transport_generic_get_mem(cmd);
3500                 if (ret < 0)
3501                         goto out_fail;
3502         }
3503
3504         /* Workaround for handling zero-length control CDBs */
3505         if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3506             !cmd->data_length) {
3507                 spin_lock_irq(&cmd->t_state_lock);
3508                 cmd->t_state = TRANSPORT_COMPLETE;
3509                 cmd->transport_state |= CMD_T_ACTIVE;
3510                 spin_unlock_irq(&cmd->t_state_lock);
3511
3512                 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
3513                         u8 ua_asc = 0, ua_ascq = 0;
3514
3515                         core_scsi3_ua_clear_for_request_sense(cmd,
3516                                         &ua_asc, &ua_ascq);
3517                 }
3518
3519                 INIT_WORK(&cmd->work, target_complete_ok_work);
3520                 queue_work(target_completion_wq, &cmd->work);
3521                 return 0;
3522         }
3523
3524         if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3525                 struct se_dev_attrib *attr = &dev->se_sub_dev->se_dev_attrib;
3526
3527                 if (transport_cmd_get_valid_sectors(cmd) < 0)
3528                         return -EINVAL;
3529
3530                 BUG_ON(cmd->data_length % attr->block_size);
3531                 BUG_ON(DIV_ROUND_UP(cmd->data_length, attr->block_size) >
3532                         attr->hw_max_sectors);
3533         }
3534
3535         atomic_inc(&cmd->t_fe_count);
3536
3537         /*
3538          * For WRITEs, let the fabric know its buffer is ready.
3539          *
3540          * The command will be added to the execution queue after its write
3541          * data has arrived.
3542          */
3543         if (cmd->data_direction == DMA_TO_DEVICE) {
3544                 target_add_to_state_list(cmd);
3545                 return transport_generic_write_pending(cmd);
3546         }
3547         /*
3548          * Everything else but a WRITE, add the command to the execution queue.
3549          */
3550         transport_execute_tasks(cmd);
3551         return 0;
3552
3553 out_fail:
3554         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3555         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3556         return -EINVAL;
3557 }
3558 EXPORT_SYMBOL(transport_generic_new_cmd);
3559
3560 /*      transport_generic_process_write():
3561  *
3562  *
3563  */
3564 void transport_generic_process_write(struct se_cmd *cmd)
3565 {
3566         transport_execute_tasks(cmd);
3567 }
3568 EXPORT_SYMBOL(transport_generic_process_write);
3569
3570 static void transport_write_pending_qf(struct se_cmd *cmd)
3571 {
3572         int ret;
3573
3574         ret = cmd->se_tfo->write_pending(cmd);
3575         if (ret == -EAGAIN || ret == -ENOMEM) {
3576                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3577                          cmd);
3578                 transport_handle_queue_full(cmd, cmd->se_dev);
3579         }
3580 }
3581
3582 static int transport_generic_write_pending(struct se_cmd *cmd)
3583 {
3584         unsigned long flags;
3585         int ret;
3586
3587         spin_lock_irqsave(&cmd->t_state_lock, flags);
3588         cmd->t_state = TRANSPORT_WRITE_PENDING;
3589         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3590
3591         /*
3592          * Clear the se_cmd for WRITE_PENDING status in order to set
3593          * CMD_T_ACTIVE so that transport_generic_handle_data can be called
3594          * from HW target mode interrupt code.  This is safe to be called
3595          * with transport_off=1 before the cmd->se_tfo->write_pending
3596          * because the se_cmd->se_lun pointer is not being cleared.
3597          */
3598         transport_cmd_check_stop(cmd, 1, 0);
3599
3600         /*
3601          * Call the fabric write_pending function here to let the
3602          * frontend know that WRITE buffers are ready.
3603          */
3604         ret = cmd->se_tfo->write_pending(cmd);
3605         if (ret == -EAGAIN || ret == -ENOMEM)
3606                 goto queue_full;
3607         else if (ret < 0)
3608                 return ret;
3609
3610         return 1;
3611
3612 queue_full:
3613         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
3614         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
3615         transport_handle_queue_full(cmd, cmd->se_dev);
3616         return 0;
3617 }
3618
3619 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
3620 {
3621         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3622                 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
3623                          transport_wait_for_tasks(cmd);
3624
3625                 transport_release_cmd(cmd);
3626         } else {
3627                 if (wait_for_tasks)
3628                         transport_wait_for_tasks(cmd);
3629
3630                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3631
3632                 if (cmd->se_lun)
3633                         transport_lun_remove_cmd(cmd);
3634
3635                 transport_put_cmd(cmd);
3636         }
3637 }
3638 EXPORT_SYMBOL(transport_generic_free_cmd);
3639
3640 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3641  * @se_sess:    session to reference
3642  * @se_cmd:     command descriptor to add
3643  * @ack_kref:   Signal that fabric will perform an ack target_put_sess_cmd()
3644  */
3645 void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
3646                         bool ack_kref)
3647 {
3648         unsigned long flags;
3649
3650         kref_init(&se_cmd->cmd_kref);
3651         /*
3652          * Add a second kref if the fabric caller is expecting to handle
3653          * fabric acknowledgement that requires two target_put_sess_cmd()
3654          * invocations before se_cmd descriptor release.
3655          */
3656         if (ack_kref == true) {
3657                 kref_get(&se_cmd->cmd_kref);
3658                 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
3659         }
3660
3661         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3662         list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3663         se_cmd->check_release = 1;
3664         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3665 }
3666 EXPORT_SYMBOL(target_get_sess_cmd);
3667
3668 static void target_release_cmd_kref(struct kref *kref)
3669 {
3670         struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
3671         struct se_session *se_sess = se_cmd->se_sess;
3672         unsigned long flags;
3673
3674         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3675         if (list_empty(&se_cmd->se_cmd_list)) {
3676                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3677                 se_cmd->se_tfo->release_cmd(se_cmd);
3678                 return;
3679         }
3680         if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3681                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3682                 complete(&se_cmd->cmd_wait_comp);
3683                 return;
3684         }
3685         list_del(&se_cmd->se_cmd_list);
3686         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3687
3688         se_cmd->se_tfo->release_cmd(se_cmd);
3689 }
3690
3691 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
3692  * @se_sess:    session to reference
3693  * @se_cmd:     command descriptor to drop
3694  */
3695 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3696 {
3697         return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
3698 }
3699 EXPORT_SYMBOL(target_put_sess_cmd);
3700
3701 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3702  * @se_sess:    session to split
3703  */
3704 void target_splice_sess_cmd_list(struct se_session *se_sess)
3705 {
3706         struct se_cmd *se_cmd;
3707         unsigned long flags;
3708
3709         WARN_ON(!list_empty(&se_sess->sess_wait_list));
3710         INIT_LIST_HEAD(&se_sess->sess_wait_list);
3711
3712         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3713         se_sess->sess_tearing_down = 1;
3714
3715         list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
3716
3717         list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
3718                 se_cmd->cmd_wait_set = 1;
3719
3720         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3721 }
3722 EXPORT_SYMBOL(target_splice_sess_cmd_list);
3723
3724 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
3725  * @se_sess:    session to wait for active I/O
3726  * @wait_for_tasks:     Make extra transport_wait_for_tasks call
3727  */
3728 void target_wait_for_sess_cmds(
3729         struct se_session *se_sess,
3730         int wait_for_tasks)
3731 {
3732         struct se_cmd *se_cmd, *tmp_cmd;
3733         bool rc = false;
3734
3735         list_for_each_entry_safe(se_cmd, tmp_cmd,
3736                                 &se_sess->sess_wait_list, se_cmd_list) {
3737                 list_del(&se_cmd->se_cmd_list);
3738
3739                 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
3740                         " %d\n", se_cmd, se_cmd->t_state,
3741                         se_cmd->se_tfo->get_cmd_state(se_cmd));
3742
3743                 if (wait_for_tasks) {
3744                         pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
3745                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3746                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
3747
3748                         rc = transport_wait_for_tasks(se_cmd);
3749
3750                         pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
3751                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3752                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
3753                 }
3754
3755                 if (!rc) {
3756                         wait_for_completion(&se_cmd->cmd_wait_comp);
3757                         pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
3758                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3759                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
3760                 }
3761
3762                 se_cmd->se_tfo->release_cmd(se_cmd);
3763         }
3764 }
3765 EXPORT_SYMBOL(target_wait_for_sess_cmds);
3766
3767 /*      transport_lun_wait_for_tasks():
3768  *
3769  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
3770  *      an struct se_lun to be successfully shutdown.
3771  */
3772 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
3773 {
3774         unsigned long flags;
3775         int ret = 0;
3776
3777         /*
3778          * If the frontend has already requested this struct se_cmd to
3779          * be stopped, we can safely ignore this struct se_cmd.
3780          */
3781         spin_lock_irqsave(&cmd->t_state_lock, flags);
3782         if (cmd->transport_state & CMD_T_STOP) {
3783                 cmd->transport_state &= ~CMD_T_LUN_STOP;
3784
3785                 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
3786                          cmd->se_tfo->get_task_tag(cmd));
3787                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3788                 transport_cmd_check_stop(cmd, 1, 0);
3789                 return -EPERM;
3790         }
3791         cmd->transport_state |= CMD_T_LUN_FE_STOP;
3792         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3793
3794         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
3795
3796         // XXX: audit task_flags checks.
3797         spin_lock_irqsave(&cmd->t_state_lock, flags);
3798         if ((cmd->transport_state & CMD_T_BUSY) &&
3799             (cmd->transport_state & CMD_T_SENT)) {
3800                 if (!target_stop_cmd(cmd, &flags))
3801                         ret++;
3802                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3803         } else {
3804                 spin_unlock_irqrestore(&cmd->t_state_lock,
3805                                 flags);
3806                 target_remove_from_execute_list(cmd);
3807         }
3808
3809         pr_debug("ConfigFS: cmd: %p stop tasks ret:"
3810                         " %d\n", cmd, ret);
3811         if (!ret) {
3812                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
3813                                 cmd->se_tfo->get_task_tag(cmd));
3814                 wait_for_completion(&cmd->transport_lun_stop_comp);
3815                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
3816                                 cmd->se_tfo->get_task_tag(cmd));
3817         }
3818         transport_remove_cmd_from_queue(cmd);
3819
3820         return 0;
3821 }
3822
3823 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
3824 {
3825         struct se_cmd *cmd = NULL;
3826         unsigned long lun_flags, cmd_flags;
3827         /*
3828          * Do exception processing and return CHECK_CONDITION status to the
3829          * Initiator Port.
3830          */
3831         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3832         while (!list_empty(&lun->lun_cmd_list)) {
3833                 cmd = list_first_entry(&lun->lun_cmd_list,
3834                        struct se_cmd, se_lun_node);
3835                 list_del_init(&cmd->se_lun_node);
3836
3837                 /*
3838                  * This will notify iscsi_target_transport.c:
3839                  * transport_cmd_check_stop() that a LUN shutdown is in
3840                  * progress for the iscsi_cmd_t.
3841                  */
3842                 spin_lock(&cmd->t_state_lock);
3843                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
3844                         "_lun_stop for  ITT: 0x%08x\n",
3845                         cmd->se_lun->unpacked_lun,
3846                         cmd->se_tfo->get_task_tag(cmd));
3847                 cmd->transport_state |= CMD_T_LUN_STOP;
3848                 spin_unlock(&cmd->t_state_lock);
3849
3850                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
3851
3852                 if (!cmd->se_lun) {
3853                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
3854                                 cmd->se_tfo->get_task_tag(cmd),
3855                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
3856                         BUG();
3857                 }
3858                 /*
3859                  * If the Storage engine still owns the iscsi_cmd_t, determine
3860                  * and/or stop its context.
3861                  */
3862                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
3863                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
3864                         cmd->se_tfo->get_task_tag(cmd));
3865
3866                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
3867                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3868                         continue;
3869                 }
3870
3871                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
3872                         "_wait_for_tasks(): SUCCESS\n",
3873                         cmd->se_lun->unpacked_lun,
3874                         cmd->se_tfo->get_task_tag(cmd));
3875
3876                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
3877                 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
3878                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
3879                         goto check_cond;
3880                 }
3881                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
3882                 target_remove_from_state_list(cmd);
3883                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
3884
3885                 /*
3886                  * The Storage engine stopped this struct se_cmd before it was
3887                  * send to the fabric frontend for delivery back to the
3888                  * Initiator Node.  Return this SCSI CDB back with an
3889                  * CHECK_CONDITION status.
3890                  */
3891 check_cond:
3892                 transport_send_check_condition_and_sense(cmd,
3893                                 TCM_NON_EXISTENT_LUN, 0);
3894                 /*
3895                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
3896                  * be released, notify the waiting thread now that LU has
3897                  * finished accessing it.
3898                  */
3899                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
3900                 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
3901                         pr_debug("SE_LUN[%d] - Detected FE stop for"
3902                                 " struct se_cmd: %p ITT: 0x%08x\n",
3903                                 lun->unpacked_lun,
3904                                 cmd, cmd->se_tfo->get_task_tag(cmd));
3905
3906                         spin_unlock_irqrestore(&cmd->t_state_lock,
3907                                         cmd_flags);
3908                         transport_cmd_check_stop(cmd, 1, 0);
3909                         complete(&cmd->transport_lun_fe_stop_comp);
3910                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3911                         continue;
3912                 }
3913                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
3914                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
3915
3916                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
3917                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3918         }
3919         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
3920 }
3921
3922 static int transport_clear_lun_thread(void *p)
3923 {
3924         struct se_lun *lun = p;
3925
3926         __transport_clear_lun_from_sessions(lun);
3927         complete(&lun->lun_shutdown_comp);
3928
3929         return 0;
3930 }
3931
3932 int transport_clear_lun_from_sessions(struct se_lun *lun)
3933 {
3934         struct task_struct *kt;
3935
3936         kt = kthread_run(transport_clear_lun_thread, lun,
3937                         "tcm_cl_%u", lun->unpacked_lun);
3938         if (IS_ERR(kt)) {
3939                 pr_err("Unable to start clear_lun thread\n");
3940                 return PTR_ERR(kt);
3941         }
3942         wait_for_completion(&lun->lun_shutdown_comp);
3943
3944         return 0;
3945 }
3946
3947 /**
3948  * transport_wait_for_tasks - wait for completion to occur
3949  * @cmd:        command to wait
3950  *
3951  * Called from frontend fabric context to wait for storage engine
3952  * to pause and/or release frontend generated struct se_cmd.
3953  */
3954 bool transport_wait_for_tasks(struct se_cmd *cmd)
3955 {
3956         unsigned long flags;
3957
3958         spin_lock_irqsave(&cmd->t_state_lock, flags);
3959         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
3960             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
3961                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3962                 return false;
3963         }
3964         /*
3965          * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
3966          * has been set in transport_set_supported_SAM_opcode().
3967          */
3968         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
3969             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
3970                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3971                 return false;
3972         }
3973         /*
3974          * If we are already stopped due to an external event (ie: LUN shutdown)
3975          * sleep until the connection can have the passed struct se_cmd back.
3976          * The cmd->transport_lun_stopped_sem will be upped by
3977          * transport_clear_lun_from_sessions() once the ConfigFS context caller
3978          * has completed its operation on the struct se_cmd.
3979          */
3980         if (cmd->transport_state & CMD_T_LUN_STOP) {
3981                 pr_debug("wait_for_tasks: Stopping"
3982                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
3983                         "_stop_comp); for ITT: 0x%08x\n",
3984                         cmd->se_tfo->get_task_tag(cmd));
3985                 /*
3986                  * There is a special case for WRITES where a FE exception +
3987                  * LUN shutdown means ConfigFS context is still sleeping on
3988                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
3989                  * We go ahead and up transport_lun_stop_comp just to be sure
3990                  * here.
3991                  */
3992                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3993                 complete(&cmd->transport_lun_stop_comp);
3994                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
3995                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3996
3997                 target_remove_from_state_list(cmd);
3998                 /*
3999                  * At this point, the frontend who was the originator of this
4000                  * struct se_cmd, now owns the structure and can be released through
4001                  * normal means below.
4002                  */
4003                 pr_debug("wait_for_tasks: Stopped"
4004                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4005                         "stop_comp); for ITT: 0x%08x\n",
4006                         cmd->se_tfo->get_task_tag(cmd));
4007
4008                 cmd->transport_state &= ~CMD_T_LUN_STOP;
4009         }
4010
4011         if (!(cmd->transport_state & CMD_T_ACTIVE)) {
4012                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4013                 return false;
4014         }
4015
4016         cmd->transport_state |= CMD_T_STOP;
4017
4018         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4019                 " i_state: %d, t_state: %d, CMD_T_STOP\n",
4020                 cmd, cmd->se_tfo->get_task_tag(cmd),
4021                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4022
4023         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4024
4025         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4026
4027         wait_for_completion(&cmd->t_transport_stop_comp);
4028
4029         spin_lock_irqsave(&cmd->t_state_lock, flags);
4030         cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
4031
4032         pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4033                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4034                 cmd->se_tfo->get_task_tag(cmd));
4035
4036         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4037
4038         return true;
4039 }
4040 EXPORT_SYMBOL(transport_wait_for_tasks);
4041
4042 static int transport_get_sense_codes(
4043         struct se_cmd *cmd,
4044         u8 *asc,
4045         u8 *ascq)
4046 {
4047         *asc = cmd->scsi_asc;
4048         *ascq = cmd->scsi_ascq;
4049
4050         return 0;
4051 }
4052
4053 static int transport_set_sense_codes(
4054         struct se_cmd *cmd,
4055         u8 asc,
4056         u8 ascq)
4057 {
4058         cmd->scsi_asc = asc;
4059         cmd->scsi_ascq = ascq;
4060
4061         return 0;
4062 }
4063
4064 int transport_send_check_condition_and_sense(
4065         struct se_cmd *cmd,
4066         u8 reason,
4067         int from_transport)
4068 {
4069         unsigned char *buffer = cmd->sense_buffer;
4070         unsigned long flags;
4071         int offset;
4072         u8 asc = 0, ascq = 0;
4073
4074         spin_lock_irqsave(&cmd->t_state_lock, flags);
4075         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4076                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4077                 return 0;
4078         }
4079         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4080         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4081
4082         if (!reason && from_transport)
4083                 goto after_reason;
4084
4085         if (!from_transport)
4086                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4087         /*
4088          * Data Segment and SenseLength of the fabric response PDU.
4089          *
4090          * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4091          * from include/scsi/scsi_cmnd.h
4092          */
4093         offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4094                                 TRANSPORT_SENSE_BUFFER);
4095         /*
4096          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
4097          * SENSE KEY values from include/scsi/scsi.h
4098          */
4099         switch (reason) {
4100         case TCM_NON_EXISTENT_LUN:
4101                 /* CURRENT ERROR */
4102                 buffer[offset] = 0x70;
4103                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4104                 /* ILLEGAL REQUEST */
4105                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4106                 /* LOGICAL UNIT NOT SUPPORTED */
4107                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4108                 break;
4109         case TCM_UNSUPPORTED_SCSI_OPCODE:
4110         case TCM_SECTOR_COUNT_TOO_MANY:
4111                 /* CURRENT ERROR */
4112                 buffer[offset] = 0x70;
4113                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4114                 /* ILLEGAL REQUEST */
4115                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4116                 /* INVALID COMMAND OPERATION CODE */
4117                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4118                 break;
4119         case TCM_UNKNOWN_MODE_PAGE:
4120                 /* CURRENT ERROR */
4121                 buffer[offset] = 0x70;
4122                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4123                 /* ILLEGAL REQUEST */
4124                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4125                 /* INVALID FIELD IN CDB */
4126                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4127                 break;
4128         case TCM_CHECK_CONDITION_ABORT_CMD:
4129                 /* CURRENT ERROR */
4130                 buffer[offset] = 0x70;
4131                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4132                 /* ABORTED COMMAND */
4133                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4134                 /* BUS DEVICE RESET FUNCTION OCCURRED */
4135                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4136                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4137                 break;
4138         case TCM_INCORRECT_AMOUNT_OF_DATA:
4139                 /* CURRENT ERROR */
4140                 buffer[offset] = 0x70;
4141                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4142                 /* ABORTED COMMAND */
4143                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4144                 /* WRITE ERROR */
4145                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4146                 /* NOT ENOUGH UNSOLICITED DATA */
4147                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4148                 break;
4149         case TCM_INVALID_CDB_FIELD:
4150                 /* CURRENT ERROR */
4151                 buffer[offset] = 0x70;
4152                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4153                 /* ILLEGAL REQUEST */
4154                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4155                 /* INVALID FIELD IN CDB */
4156                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4157                 break;
4158         case TCM_INVALID_PARAMETER_LIST:
4159                 /* CURRENT ERROR */
4160                 buffer[offset] = 0x70;
4161                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4162                 /* ILLEGAL REQUEST */
4163                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4164                 /* INVALID FIELD IN PARAMETER LIST */
4165                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4166                 break;
4167         case TCM_UNEXPECTED_UNSOLICITED_DATA:
4168                 /* CURRENT ERROR */
4169                 buffer[offset] = 0x70;
4170                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4171                 /* ABORTED COMMAND */
4172                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4173                 /* WRITE ERROR */
4174                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4175                 /* UNEXPECTED_UNSOLICITED_DATA */
4176                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4177                 break;
4178         case TCM_SERVICE_CRC_ERROR:
4179                 /* CURRENT ERROR */
4180                 buffer[offset] = 0x70;
4181                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4182                 /* ABORTED COMMAND */
4183                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4184                 /* PROTOCOL SERVICE CRC ERROR */
4185                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4186                 /* N/A */
4187                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4188                 break;
4189         case TCM_SNACK_REJECTED:
4190                 /* CURRENT ERROR */
4191                 buffer[offset] = 0x70;
4192                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4193                 /* ABORTED COMMAND */
4194                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4195                 /* READ ERROR */
4196                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4197                 /* FAILED RETRANSMISSION REQUEST */
4198                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4199                 break;
4200         case TCM_WRITE_PROTECTED:
4201                 /* CURRENT ERROR */
4202                 buffer[offset] = 0x70;
4203                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4204                 /* DATA PROTECT */
4205                 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4206                 /* WRITE PROTECTED */
4207                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4208                 break;
4209         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4210                 /* CURRENT ERROR */
4211                 buffer[offset] = 0x70;
4212                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4213                 /* UNIT ATTENTION */
4214                 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4215                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4216                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4217                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4218                 break;
4219         case TCM_CHECK_CONDITION_NOT_READY:
4220                 /* CURRENT ERROR */
4221                 buffer[offset] = 0x70;
4222                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4223                 /* Not Ready */
4224                 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4225                 transport_get_sense_codes(cmd, &asc, &ascq);
4226                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4227                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4228                 break;
4229         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4230         default:
4231                 /* CURRENT ERROR */
4232                 buffer[offset] = 0x70;
4233                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4234                 /* ILLEGAL REQUEST */
4235                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4236                 /* LOGICAL UNIT COMMUNICATION FAILURE */
4237                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4238                 break;
4239         }
4240         /*
4241          * This code uses linux/include/scsi/scsi.h SAM status codes!
4242          */
4243         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4244         /*
4245          * Automatically padded, this value is encoded in the fabric's
4246          * data_length response PDU containing the SCSI defined sense data.
4247          */
4248         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
4249
4250 after_reason:
4251         return cmd->se_tfo->queue_status(cmd);
4252 }
4253 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4254
4255 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4256 {
4257         int ret = 0;
4258
4259         if (cmd->transport_state & CMD_T_ABORTED) {
4260                 if (!send_status ||
4261                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4262                         return 1;
4263
4264                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4265                         " status for CDB: 0x%02x ITT: 0x%08x\n",
4266                         cmd->t_task_cdb[0],
4267                         cmd->se_tfo->get_task_tag(cmd));
4268
4269                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4270                 cmd->se_tfo->queue_status(cmd);
4271                 ret = 1;
4272         }
4273         return ret;
4274 }
4275 EXPORT_SYMBOL(transport_check_aborted_status);
4276
4277 void transport_send_task_abort(struct se_cmd *cmd)
4278 {
4279         unsigned long flags;
4280
4281         spin_lock_irqsave(&cmd->t_state_lock, flags);
4282         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4283                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4284                 return;
4285         }
4286         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4287
4288         /*
4289          * If there are still expected incoming fabric WRITEs, we wait
4290          * until until they have completed before sending a TASK_ABORTED
4291          * response.  This response with TASK_ABORTED status will be
4292          * queued back to fabric module by transport_check_aborted_status().
4293          */
4294         if (cmd->data_direction == DMA_TO_DEVICE) {
4295                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4296                         cmd->transport_state |= CMD_T_ABORTED;
4297                         smp_mb__after_atomic_inc();
4298                 }
4299         }
4300         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4301
4302         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4303                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4304                 cmd->se_tfo->get_task_tag(cmd));
4305
4306         cmd->se_tfo->queue_status(cmd);
4307 }
4308
4309 static int transport_generic_do_tmr(struct se_cmd *cmd)
4310 {
4311         struct se_device *dev = cmd->se_dev;
4312         struct se_tmr_req *tmr = cmd->se_tmr_req;
4313         int ret;
4314
4315         switch (tmr->function) {
4316         case TMR_ABORT_TASK:
4317                 core_tmr_abort_task(dev, tmr, cmd->se_sess);
4318                 break;
4319         case TMR_ABORT_TASK_SET:
4320         case TMR_CLEAR_ACA:
4321         case TMR_CLEAR_TASK_SET:
4322                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4323                 break;
4324         case TMR_LUN_RESET:
4325                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4326                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4327                                          TMR_FUNCTION_REJECTED;
4328                 break;
4329         case TMR_TARGET_WARM_RESET:
4330                 tmr->response = TMR_FUNCTION_REJECTED;
4331                 break;
4332         case TMR_TARGET_COLD_RESET:
4333                 tmr->response = TMR_FUNCTION_REJECTED;
4334                 break;
4335         default:
4336                 pr_err("Uknown TMR function: 0x%02x.\n",
4337                                 tmr->function);
4338                 tmr->response = TMR_FUNCTION_REJECTED;
4339                 break;
4340         }
4341
4342         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4343         cmd->se_tfo->queue_tm_rsp(cmd);
4344
4345         transport_cmd_check_stop_to_fabric(cmd);
4346         return 0;
4347 }
4348
4349 /*      transport_processing_thread():
4350  *
4351  *
4352  */
4353 static int transport_processing_thread(void *param)
4354 {
4355         int ret;
4356         struct se_cmd *cmd;
4357         struct se_device *dev = param;
4358
4359         while (!kthread_should_stop()) {
4360                 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4361                                 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4362                                 kthread_should_stop());
4363                 if (ret < 0)
4364                         goto out;
4365
4366 get_cmd:
4367                 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4368                 if (!cmd)
4369                         continue;
4370
4371                 switch (cmd->t_state) {
4372                 case TRANSPORT_NEW_CMD:
4373                         BUG();
4374                         break;
4375                 case TRANSPORT_NEW_CMD_MAP:
4376                         if (!cmd->se_tfo->new_cmd_map) {
4377                                 pr_err("cmd->se_tfo->new_cmd_map is"
4378                                         " NULL for TRANSPORT_NEW_CMD_MAP\n");
4379                                 BUG();
4380                         }
4381                         ret = cmd->se_tfo->new_cmd_map(cmd);
4382                         if (ret < 0) {
4383                                 transport_generic_request_failure(cmd);
4384                                 break;
4385                         }
4386                         ret = transport_generic_new_cmd(cmd);
4387                         if (ret < 0) {
4388                                 transport_generic_request_failure(cmd);
4389                                 break;
4390                         }
4391                         break;
4392                 case TRANSPORT_PROCESS_WRITE:
4393                         transport_generic_process_write(cmd);
4394                         break;
4395                 case TRANSPORT_PROCESS_TMR:
4396                         transport_generic_do_tmr(cmd);
4397                         break;
4398                 case TRANSPORT_COMPLETE_QF_WP:
4399                         transport_write_pending_qf(cmd);
4400                         break;
4401                 case TRANSPORT_COMPLETE_QF_OK:
4402                         transport_complete_qf(cmd);
4403                         break;
4404                 default:
4405                         pr_err("Unknown t_state: %d  for ITT: 0x%08x "
4406                                 "i_state: %d on SE LUN: %u\n",
4407                                 cmd->t_state,
4408                                 cmd->se_tfo->get_task_tag(cmd),
4409                                 cmd->se_tfo->get_cmd_state(cmd),
4410                                 cmd->se_lun->unpacked_lun);
4411                         BUG();
4412                 }
4413
4414                 goto get_cmd;
4415         }
4416
4417 out:
4418         WARN_ON(!list_empty(&dev->state_list));
4419         WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4420         dev->process_thread = NULL;
4421         return 0;
4422 }