linux/drivers/target/target_core_device.c
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   1/*******************************************************************************
   2 * Filename:  target_core_device.c (based on iscsi_target_device.c)
   3 *
   4 * This file contains the TCM Virtual Device and Disk Transport
   5 * agnostic related functions.
   6 *
   7 * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
   8 * Copyright (c) 2005-2006 SBE, Inc.  All Rights Reserved.
   9 * Copyright (c) 2007-2010 Rising Tide Systems
  10 * Copyright (c) 2008-2010 Linux-iSCSI.org
  11 *
  12 * Nicholas A. Bellinger <nab@kernel.org>
  13 *
  14 * This program is free software; you can redistribute it and/or modify
  15 * it under the terms of the GNU General Public License as published by
  16 * the Free Software Foundation; either version 2 of the License, or
  17 * (at your option) any later version.
  18 *
  19 * This program is distributed in the hope that it will be useful,
  20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 * GNU General Public License for more details.
  23 *
  24 * You should have received a copy of the GNU General Public License
  25 * along with this program; if not, write to the Free Software
  26 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27 *
  28 ******************************************************************************/
  29
  30#include <linux/net.h>
  31#include <linux/string.h>
  32#include <linux/delay.h>
  33#include <linux/timer.h>
  34#include <linux/slab.h>
  35#include <linux/spinlock.h>
  36#include <linux/kthread.h>
  37#include <linux/in.h>
  38#include <linux/export.h>
  39#include <net/sock.h>
  40#include <net/tcp.h>
  41#include <scsi/scsi.h>
  42#include <scsi/scsi_device.h>
  43
  44#include <target/target_core_base.h>
  45#include <target/target_core_backend.h>
  46#include <target/target_core_fabric.h>
  47
  48#include "target_core_internal.h"
  49#include "target_core_alua.h"
  50#include "target_core_pr.h"
  51#include "target_core_ua.h"
  52
  53static void se_dev_start(struct se_device *dev);
  54static void se_dev_stop(struct se_device *dev);
  55
  56static struct se_hba *lun0_hba;
  57static struct se_subsystem_dev *lun0_su_dev;
  58/* not static, needed by tpg.c */
  59struct se_device *g_lun0_dev;
  60
  61int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
  62{
  63        struct se_lun *se_lun = NULL;
  64        struct se_session *se_sess = se_cmd->se_sess;
  65        struct se_device *dev;
  66        unsigned long flags;
  67
  68        if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
  69                se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
  70                se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
  71                return -ENODEV;
  72        }
  73
  74        spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
  75        se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
  76        if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
  77                struct se_dev_entry *deve = se_cmd->se_deve;
  78
  79                deve->total_cmds++;
  80                deve->total_bytes += se_cmd->data_length;
  81
  82                if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  83                    (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
  84                        se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
  85                        se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
  86                        pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  87                                " Access for 0x%08x\n",
  88                                se_cmd->se_tfo->get_fabric_name(),
  89                                unpacked_lun);
  90                        spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
  91                        return -EACCES;
  92                }
  93
  94                if (se_cmd->data_direction == DMA_TO_DEVICE)
  95                        deve->write_bytes += se_cmd->data_length;
  96                else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  97                        deve->read_bytes += se_cmd->data_length;
  98
  99                deve->deve_cmds++;
 100
 101                se_lun = deve->se_lun;
 102                se_cmd->se_lun = deve->se_lun;
 103                se_cmd->pr_res_key = deve->pr_res_key;
 104                se_cmd->orig_fe_lun = unpacked_lun;
 105                se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 106        }
 107        spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 108
 109        if (!se_lun) {
 110                /*
 111                 * Use the se_portal_group->tpg_virt_lun0 to allow for
 112                 * REPORT_LUNS, et al to be returned when no active
 113                 * MappedLUN=0 exists for this Initiator Port.
 114                 */
 115                if (unpacked_lun != 0) {
 116                        se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 117                        se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 118                        pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 119                                " Access for 0x%08x\n",
 120                                se_cmd->se_tfo->get_fabric_name(),
 121                                unpacked_lun);
 122                        return -ENODEV;
 123                }
 124                /*
 125                 * Force WRITE PROTECT for virtual LUN 0
 126                 */
 127                if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 128                    (se_cmd->data_direction != DMA_NONE)) {
 129                        se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
 130                        se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 131                        return -EACCES;
 132                }
 133
 134                se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 135                se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 136                se_cmd->orig_fe_lun = 0;
 137                se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 138        }
 139        /*
 140         * Determine if the struct se_lun is online.
 141         * FIXME: Check for LUN_RESET + UNIT Attention
 142         */
 143        if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 144                se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 145                se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 146                return -ENODEV;
 147        }
 148
 149        /* Directly associate cmd with se_dev */
 150        se_cmd->se_dev = se_lun->lun_se_dev;
 151
 152        /* TODO: get rid of this and use atomics for stats */
 153        dev = se_lun->lun_se_dev;
 154        spin_lock_irqsave(&dev->stats_lock, flags);
 155        dev->num_cmds++;
 156        if (se_cmd->data_direction == DMA_TO_DEVICE)
 157                dev->write_bytes += se_cmd->data_length;
 158        else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 159                dev->read_bytes += se_cmd->data_length;
 160        spin_unlock_irqrestore(&dev->stats_lock, flags);
 161
 162        spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
 163        list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
 164        spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
 165
 166        return 0;
 167}
 168EXPORT_SYMBOL(transport_lookup_cmd_lun);
 169
 170int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
 171{
 172        struct se_dev_entry *deve;
 173        struct se_lun *se_lun = NULL;
 174        struct se_session *se_sess = se_cmd->se_sess;
 175        struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 176        unsigned long flags;
 177
 178        if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
 179                se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 180                se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 181                return -ENODEV;
 182        }
 183
 184        spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
 185        se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
 186        deve = se_cmd->se_deve;
 187
 188        if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 189                se_tmr->tmr_lun = deve->se_lun;
 190                se_cmd->se_lun = deve->se_lun;
 191                se_lun = deve->se_lun;
 192                se_cmd->pr_res_key = deve->pr_res_key;
 193                se_cmd->orig_fe_lun = unpacked_lun;
 194        }
 195        spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 196
 197        if (!se_lun) {
 198                pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 199                        " Access for 0x%08x\n",
 200                        se_cmd->se_tfo->get_fabric_name(),
 201                        unpacked_lun);
 202                se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 203                return -ENODEV;
 204        }
 205        /*
 206         * Determine if the struct se_lun is online.
 207         * FIXME: Check for LUN_RESET + UNIT Attention
 208         */
 209        if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 210                se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 211                return -ENODEV;
 212        }
 213
 214        /* Directly associate cmd with se_dev */
 215        se_cmd->se_dev = se_lun->lun_se_dev;
 216        se_tmr->tmr_dev = se_lun->lun_se_dev;
 217
 218        spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 219        list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 220        spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 221
 222        return 0;
 223}
 224EXPORT_SYMBOL(transport_lookup_tmr_lun);
 225
 226/*
 227 * This function is called from core_scsi3_emulate_pro_register_and_move()
 228 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 229 * when a matching rtpi is found.
 230 */
 231struct se_dev_entry *core_get_se_deve_from_rtpi(
 232        struct se_node_acl *nacl,
 233        u16 rtpi)
 234{
 235        struct se_dev_entry *deve;
 236        struct se_lun *lun;
 237        struct se_port *port;
 238        struct se_portal_group *tpg = nacl->se_tpg;
 239        u32 i;
 240
 241        spin_lock_irq(&nacl->device_list_lock);
 242        for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 243                deve = nacl->device_list[i];
 244
 245                if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 246                        continue;
 247
 248                lun = deve->se_lun;
 249                if (!lun) {
 250                        pr_err("%s device entries device pointer is"
 251                                " NULL, but Initiator has access.\n",
 252                                tpg->se_tpg_tfo->get_fabric_name());
 253                        continue;
 254                }
 255                port = lun->lun_sep;
 256                if (!port) {
 257                        pr_err("%s device entries device pointer is"
 258                                " NULL, but Initiator has access.\n",
 259                                tpg->se_tpg_tfo->get_fabric_name());
 260                        continue;
 261                }
 262                if (port->sep_rtpi != rtpi)
 263                        continue;
 264
 265                atomic_inc(&deve->pr_ref_count);
 266                smp_mb__after_atomic_inc();
 267                spin_unlock_irq(&nacl->device_list_lock);
 268
 269                return deve;
 270        }
 271        spin_unlock_irq(&nacl->device_list_lock);
 272
 273        return NULL;
 274}
 275
 276int core_free_device_list_for_node(
 277        struct se_node_acl *nacl,
 278        struct se_portal_group *tpg)
 279{
 280        struct se_dev_entry *deve;
 281        struct se_lun *lun;
 282        u32 i;
 283
 284        if (!nacl->device_list)
 285                return 0;
 286
 287        spin_lock_irq(&nacl->device_list_lock);
 288        for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 289                deve = nacl->device_list[i];
 290
 291                if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 292                        continue;
 293
 294                if (!deve->se_lun) {
 295                        pr_err("%s device entries device pointer is"
 296                                " NULL, but Initiator has access.\n",
 297                                tpg->se_tpg_tfo->get_fabric_name());
 298                        continue;
 299                }
 300                lun = deve->se_lun;
 301
 302                spin_unlock_irq(&nacl->device_list_lock);
 303                core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
 304                        TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
 305                spin_lock_irq(&nacl->device_list_lock);
 306        }
 307        spin_unlock_irq(&nacl->device_list_lock);
 308
 309        array_free(nacl->device_list, TRANSPORT_MAX_LUNS_PER_TPG);
 310        nacl->device_list = NULL;
 311
 312        return 0;
 313}
 314
 315void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
 316{
 317        struct se_dev_entry *deve;
 318        unsigned long flags;
 319
 320        spin_lock_irqsave(&se_nacl->device_list_lock, flags);
 321        deve = se_nacl->device_list[se_cmd->orig_fe_lun];
 322        deve->deve_cmds--;
 323        spin_unlock_irqrestore(&se_nacl->device_list_lock, flags);
 324}
 325
 326void core_update_device_list_access(
 327        u32 mapped_lun,
 328        u32 lun_access,
 329        struct se_node_acl *nacl)
 330{
 331        struct se_dev_entry *deve;
 332
 333        spin_lock_irq(&nacl->device_list_lock);
 334        deve = nacl->device_list[mapped_lun];
 335        if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 336                deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 337                deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 338        } else {
 339                deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 340                deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 341        }
 342        spin_unlock_irq(&nacl->device_list_lock);
 343}
 344
 345/*      core_enable_device_list_for_node():
 346 *
 347 *
 348 */
 349int core_enable_device_list_for_node(
 350        struct se_lun *lun,
 351        struct se_lun_acl *lun_acl,
 352        u32 mapped_lun,
 353        u32 lun_access,
 354        struct se_node_acl *nacl,
 355        struct se_portal_group *tpg)
 356{
 357        struct se_port *port = lun->lun_sep;
 358        struct se_dev_entry *deve;
 359
 360        spin_lock_irq(&nacl->device_list_lock);
 361
 362        deve = nacl->device_list[mapped_lun];
 363
 364        /*
 365         * Check if the call is handling demo mode -> explict LUN ACL
 366         * transition.  This transition must be for the same struct se_lun
 367         * + mapped_lun that was setup in demo mode..
 368         */
 369        if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 370                if (deve->se_lun_acl != NULL) {
 371                        pr_err("struct se_dev_entry->se_lun_acl"
 372                               " already set for demo mode -> explict"
 373                               " LUN ACL transition\n");
 374                        spin_unlock_irq(&nacl->device_list_lock);
 375                        return -EINVAL;
 376                }
 377                if (deve->se_lun != lun) {
 378                        pr_err("struct se_dev_entry->se_lun does"
 379                               " match passed struct se_lun for demo mode"
 380                               " -> explict LUN ACL transition\n");
 381                        spin_unlock_irq(&nacl->device_list_lock);
 382                        return -EINVAL;
 383                }
 384                deve->se_lun_acl = lun_acl;
 385
 386                if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 387                        deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 388                        deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 389                } else {
 390                        deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 391                        deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 392                }
 393
 394                spin_unlock_irq(&nacl->device_list_lock);
 395                return 0;
 396        }
 397
 398        deve->se_lun = lun;
 399        deve->se_lun_acl = lun_acl;
 400        deve->mapped_lun = mapped_lun;
 401        deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
 402
 403        if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 404                deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 405                deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 406        } else {
 407                deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 408                deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 409        }
 410
 411        deve->creation_time = get_jiffies_64();
 412        deve->attach_count++;
 413        spin_unlock_irq(&nacl->device_list_lock);
 414
 415        spin_lock_bh(&port->sep_alua_lock);
 416        list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
 417        spin_unlock_bh(&port->sep_alua_lock);
 418
 419        return 0;
 420}
 421
 422/*      core_disable_device_list_for_node():
 423 *
 424 *
 425 */
 426int core_disable_device_list_for_node(
 427        struct se_lun *lun,
 428        struct se_lun_acl *lun_acl,
 429        u32 mapped_lun,
 430        u32 lun_access,
 431        struct se_node_acl *nacl,
 432        struct se_portal_group *tpg)
 433{
 434        struct se_port *port = lun->lun_sep;
 435        struct se_dev_entry *deve = nacl->device_list[mapped_lun];
 436
 437        /*
 438         * If the MappedLUN entry is being disabled, the entry in
 439         * port->sep_alua_list must be removed now before clearing the
 440         * struct se_dev_entry pointers below as logic in
 441         * core_alua_do_transition_tg_pt() depends on these being present.
 442         *
 443         * deve->se_lun_acl will be NULL for demo-mode created LUNs
 444         * that have not been explicitly converted to MappedLUNs ->
 445         * struct se_lun_acl, but we remove deve->alua_port_list from
 446         * port->sep_alua_list. This also means that active UAs and
 447         * NodeACL context specific PR metadata for demo-mode
 448         * MappedLUN *deve will be released below..
 449         */
 450        spin_lock_bh(&port->sep_alua_lock);
 451        list_del(&deve->alua_port_list);
 452        spin_unlock_bh(&port->sep_alua_lock);
 453        /*
 454         * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
 455         * PR operation to complete.
 456         */
 457        while (atomic_read(&deve->pr_ref_count) != 0)
 458                cpu_relax();
 459
 460        spin_lock_irq(&nacl->device_list_lock);
 461        /*
 462         * Disable struct se_dev_entry LUN ACL mapping
 463         */
 464        core_scsi3_ua_release_all(deve);
 465        deve->se_lun = NULL;
 466        deve->se_lun_acl = NULL;
 467        deve->lun_flags = 0;
 468        deve->creation_time = 0;
 469        deve->attach_count--;
 470        spin_unlock_irq(&nacl->device_list_lock);
 471
 472        core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
 473        return 0;
 474}
 475
 476/*      core_clear_lun_from_tpg():
 477 *
 478 *
 479 */
 480void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 481{
 482        struct se_node_acl *nacl;
 483        struct se_dev_entry *deve;
 484        u32 i;
 485
 486        spin_lock_irq(&tpg->acl_node_lock);
 487        list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 488                spin_unlock_irq(&tpg->acl_node_lock);
 489
 490                spin_lock_irq(&nacl->device_list_lock);
 491                for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 492                        deve = nacl->device_list[i];
 493                        if (lun != deve->se_lun)
 494                                continue;
 495                        spin_unlock_irq(&nacl->device_list_lock);
 496
 497                        core_disable_device_list_for_node(lun, NULL,
 498                                deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
 499                                nacl, tpg);
 500
 501                        spin_lock_irq(&nacl->device_list_lock);
 502                }
 503                spin_unlock_irq(&nacl->device_list_lock);
 504
 505                spin_lock_irq(&tpg->acl_node_lock);
 506        }
 507        spin_unlock_irq(&tpg->acl_node_lock);
 508}
 509
 510static struct se_port *core_alloc_port(struct se_device *dev)
 511{
 512        struct se_port *port, *port_tmp;
 513
 514        port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
 515        if (!port) {
 516                pr_err("Unable to allocate struct se_port\n");
 517                return ERR_PTR(-ENOMEM);
 518        }
 519        INIT_LIST_HEAD(&port->sep_alua_list);
 520        INIT_LIST_HEAD(&port->sep_list);
 521        atomic_set(&port->sep_tg_pt_secondary_offline, 0);
 522        spin_lock_init(&port->sep_alua_lock);
 523        mutex_init(&port->sep_tg_pt_md_mutex);
 524
 525        spin_lock(&dev->se_port_lock);
 526        if (dev->dev_port_count == 0x0000ffff) {
 527                pr_warn("Reached dev->dev_port_count =="
 528                                " 0x0000ffff\n");
 529                spin_unlock(&dev->se_port_lock);
 530                return ERR_PTR(-ENOSPC);
 531        }
 532again:
 533        /*
 534         * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 535         * Here is the table from spc4r17 section 7.7.3.8.
 536         *
 537         *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 538         *
 539         * Code      Description
 540         * 0h        Reserved
 541         * 1h        Relative port 1, historically known as port A
 542         * 2h        Relative port 2, historically known as port B
 543         * 3h to FFFFh    Relative port 3 through 65 535
 544         */
 545        port->sep_rtpi = dev->dev_rpti_counter++;
 546        if (!port->sep_rtpi)
 547                goto again;
 548
 549        list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
 550                /*
 551                 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 552                 * for 16-bit wrap..
 553                 */
 554                if (port->sep_rtpi == port_tmp->sep_rtpi)
 555                        goto again;
 556        }
 557        spin_unlock(&dev->se_port_lock);
 558
 559        return port;
 560}
 561
 562static void core_export_port(
 563        struct se_device *dev,
 564        struct se_portal_group *tpg,
 565        struct se_port *port,
 566        struct se_lun *lun)
 567{
 568        struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 569        struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
 570
 571        spin_lock(&dev->se_port_lock);
 572        spin_lock(&lun->lun_sep_lock);
 573        port->sep_tpg = tpg;
 574        port->sep_lun = lun;
 575        lun->lun_sep = port;
 576        spin_unlock(&lun->lun_sep_lock);
 577
 578        list_add_tail(&port->sep_list, &dev->dev_sep_list);
 579        spin_unlock(&dev->se_port_lock);
 580
 581        if (su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
 582                tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
 583                if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
 584                        pr_err("Unable to allocate t10_alua_tg_pt"
 585                                        "_gp_member_t\n");
 586                        return;
 587                }
 588                spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 589                __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
 590                        su_dev->t10_alua.default_tg_pt_gp);
 591                spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 592                pr_debug("%s/%s: Adding to default ALUA Target Port"
 593                        " Group: alua/default_tg_pt_gp\n",
 594                        dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
 595        }
 596
 597        dev->dev_port_count++;
 598        port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFIER */
 599}
 600
 601/*
 602 *      Called with struct se_device->se_port_lock spinlock held.
 603 */
 604static void core_release_port(struct se_device *dev, struct se_port *port)
 605        __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
 606{
 607        /*
 608         * Wait for any port reference for PR ALL_TG_PT=1 operation
 609         * to complete in __core_scsi3_alloc_registration()
 610         */
 611        spin_unlock(&dev->se_port_lock);
 612        if (atomic_read(&port->sep_tg_pt_ref_cnt))
 613                cpu_relax();
 614        spin_lock(&dev->se_port_lock);
 615
 616        core_alua_free_tg_pt_gp_mem(port);
 617
 618        list_del(&port->sep_list);
 619        dev->dev_port_count--;
 620        kfree(port);
 621}
 622
 623int core_dev_export(
 624        struct se_device *dev,
 625        struct se_portal_group *tpg,
 626        struct se_lun *lun)
 627{
 628        struct se_port *port;
 629
 630        port = core_alloc_port(dev);
 631        if (IS_ERR(port))
 632                return PTR_ERR(port);
 633
 634        lun->lun_se_dev = dev;
 635        se_dev_start(dev);
 636
 637        atomic_inc(&dev->dev_export_obj.obj_access_count);
 638        core_export_port(dev, tpg, port, lun);
 639        return 0;
 640}
 641
 642void core_dev_unexport(
 643        struct se_device *dev,
 644        struct se_portal_group *tpg,
 645        struct se_lun *lun)
 646{
 647        struct se_port *port = lun->lun_sep;
 648
 649        spin_lock(&lun->lun_sep_lock);
 650        if (lun->lun_se_dev == NULL) {
 651                spin_unlock(&lun->lun_sep_lock);
 652                return;
 653        }
 654        spin_unlock(&lun->lun_sep_lock);
 655
 656        spin_lock(&dev->se_port_lock);
 657        atomic_dec(&dev->dev_export_obj.obj_access_count);
 658        core_release_port(dev, port);
 659        spin_unlock(&dev->se_port_lock);
 660
 661        se_dev_stop(dev);
 662        lun->lun_se_dev = NULL;
 663}
 664
 665int target_report_luns(struct se_cmd *se_cmd)
 666{
 667        struct se_dev_entry *deve;
 668        struct se_session *se_sess = se_cmd->se_sess;
 669        unsigned char *buf;
 670        u32 lun_count = 0, offset = 8, i;
 671
 672        if (se_cmd->data_length < 16) {
 673                pr_warn("REPORT LUNS allocation length %u too small\n",
 674                        se_cmd->data_length);
 675                se_cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
 676                return -EINVAL;
 677        }
 678
 679        buf = transport_kmap_data_sg(se_cmd);
 680        if (!buf)
 681                return -ENOMEM;
 682
 683        /*
 684         * If no struct se_session pointer is present, this struct se_cmd is
 685         * coming via a target_core_mod PASSTHROUGH op, and not through
 686         * a $FABRIC_MOD.  In that case, report LUN=0 only.
 687         */
 688        if (!se_sess) {
 689                int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
 690                lun_count = 1;
 691                goto done;
 692        }
 693
 694        spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
 695        for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 696                deve = se_sess->se_node_acl->device_list[i];
 697                if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 698                        continue;
 699                /*
 700                 * We determine the correct LUN LIST LENGTH even once we
 701                 * have reached the initial allocation length.
 702                 * See SPC2-R20 7.19.
 703                 */
 704                lun_count++;
 705                if ((offset + 8) > se_cmd->data_length)
 706                        continue;
 707
 708                int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
 709                offset += 8;
 710        }
 711        spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
 712
 713        /*
 714         * See SPC3 r07, page 159.
 715         */
 716done:
 717        lun_count *= 8;
 718        buf[0] = ((lun_count >> 24) & 0xff);
 719        buf[1] = ((lun_count >> 16) & 0xff);
 720        buf[2] = ((lun_count >> 8) & 0xff);
 721        buf[3] = (lun_count & 0xff);
 722        transport_kunmap_data_sg(se_cmd);
 723
 724        target_complete_cmd(se_cmd, GOOD);
 725        return 0;
 726}
 727
 728/*      se_release_device_for_hba():
 729 *
 730 *
 731 */
 732void se_release_device_for_hba(struct se_device *dev)
 733{
 734        struct se_hba *hba = dev->se_hba;
 735
 736        if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 737            (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
 738            (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
 739            (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
 740            (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
 741                se_dev_stop(dev);
 742
 743        if (dev->dev_ptr) {
 744                destroy_workqueue(dev->tmr_wq);
 745                if (dev->transport->free_device)
 746                        dev->transport->free_device(dev->dev_ptr);
 747        }
 748
 749        spin_lock(&hba->device_lock);
 750        list_del(&dev->dev_list);
 751        hba->dev_count--;
 752        spin_unlock(&hba->device_lock);
 753
 754        core_scsi3_free_all_registrations(dev);
 755        se_release_vpd_for_dev(dev);
 756
 757        kfree(dev);
 758}
 759
 760void se_release_vpd_for_dev(struct se_device *dev)
 761{
 762        struct t10_vpd *vpd, *vpd_tmp;
 763
 764        spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
 765        list_for_each_entry_safe(vpd, vpd_tmp,
 766                        &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
 767                list_del(&vpd->vpd_list);
 768                kfree(vpd);
 769        }
 770        spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
 771}
 772
 773/*      se_free_virtual_device():
 774 *
 775 *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
 776 */
 777int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
 778{
 779        if (!list_empty(&dev->dev_sep_list))
 780                dump_stack();
 781
 782        core_alua_free_lu_gp_mem(dev);
 783        se_release_device_for_hba(dev);
 784
 785        return 0;
 786}
 787
 788static void se_dev_start(struct se_device *dev)
 789{
 790        struct se_hba *hba = dev->se_hba;
 791
 792        spin_lock(&hba->device_lock);
 793        atomic_inc(&dev->dev_obj.obj_access_count);
 794        if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
 795                if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
 796                        dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
 797                        dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
 798                } else if (dev->dev_status &
 799                           TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
 800                        dev->dev_status &=
 801                                ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 802                        dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 803                }
 804        }
 805        spin_unlock(&hba->device_lock);
 806}
 807
 808static void se_dev_stop(struct se_device *dev)
 809{
 810        struct se_hba *hba = dev->se_hba;
 811
 812        spin_lock(&hba->device_lock);
 813        atomic_dec(&dev->dev_obj.obj_access_count);
 814        if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
 815                if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
 816                        dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
 817                        dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
 818                } else if (dev->dev_status &
 819                           TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
 820                        dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 821                        dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 822                }
 823        }
 824        spin_unlock(&hba->device_lock);
 825}
 826
 827int se_dev_check_online(struct se_device *dev)
 828{
 829        unsigned long flags;
 830        int ret;
 831
 832        spin_lock_irqsave(&dev->dev_status_lock, flags);
 833        ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 834               (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
 835        spin_unlock_irqrestore(&dev->dev_status_lock, flags);
 836
 837        return ret;
 838}
 839
 840int se_dev_check_shutdown(struct se_device *dev)
 841{
 842        int ret;
 843
 844        spin_lock_irq(&dev->dev_status_lock);
 845        ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
 846        spin_unlock_irq(&dev->dev_status_lock);
 847
 848        return ret;
 849}
 850
 851static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 852{
 853        u32 aligned_max_sectors;
 854        u32 alignment;
 855        /*
 856         * Limit max_sectors to a PAGE_SIZE aligned value for modern
 857         * transport_allocate_data_tasks() operation.
 858         */
 859        alignment = max(1ul, PAGE_SIZE / block_size);
 860        aligned_max_sectors = rounddown(max_sectors, alignment);
 861
 862        if (max_sectors != aligned_max_sectors)
 863                pr_info("Rounding down aligned max_sectors from %u to %u\n",
 864                        max_sectors, aligned_max_sectors);
 865
 866        return aligned_max_sectors;
 867}
 868
 869void se_dev_set_default_attribs(
 870        struct se_device *dev,
 871        struct se_dev_limits *dev_limits)
 872{
 873        struct queue_limits *limits = &dev_limits->limits;
 874
 875        dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
 876        dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
 877        dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
 878        dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 879        dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 880        dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
 881        dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 882        dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 883        dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
 884        dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
 885        dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 886        dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
 887        dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
 888        /*
 889         * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
 890         * iblock_create_virtdevice() from struct queue_limits values
 891         * if blk_queue_discard()==1
 892         */
 893        dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 894        dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
 895                DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 896        dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 897        dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
 898                                DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 899        /*
 900         * block_size is based on subsystem plugin dependent requirements.
 901         */
 902        dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
 903        dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
 904        /*
 905         * Align max_hw_sectors down to PAGE_SIZE I/O transfers
 906         */
 907        limits->max_hw_sectors = se_dev_align_max_sectors(limits->max_hw_sectors,
 908                                                limits->logical_block_size);
 909        dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
 910
 911        /*
 912         * Set fabric_max_sectors, which is reported in block limits
 913         * VPD page (B0h).
 914         */
 915        dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
 916        /*
 917         * Set optimal_sectors from fabric_max_sectors, which can be
 918         * lowered via configfs.
 919         */
 920        dev->se_sub_dev->se_dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
 921        /*
 922         * queue_depth is based on subsystem plugin dependent requirements.
 923         */
 924        dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
 925        dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
 926}
 927
 928int se_dev_set_max_unmap_lba_count(
 929        struct se_device *dev,
 930        u32 max_unmap_lba_count)
 931{
 932        dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 933        pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
 934                        dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
 935        return 0;
 936}
 937
 938int se_dev_set_max_unmap_block_desc_count(
 939        struct se_device *dev,
 940        u32 max_unmap_block_desc_count)
 941{
 942        dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
 943                max_unmap_block_desc_count;
 944        pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
 945                        dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
 946        return 0;
 947}
 948
 949int se_dev_set_unmap_granularity(
 950        struct se_device *dev,
 951        u32 unmap_granularity)
 952{
 953        dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
 954        pr_debug("dev[%p]: Set unmap_granularity: %u\n",
 955                        dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
 956        return 0;
 957}
 958
 959int se_dev_set_unmap_granularity_alignment(
 960        struct se_device *dev,
 961        u32 unmap_granularity_alignment)
 962{
 963        dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 964        pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
 965                        dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
 966        return 0;
 967}
 968
 969int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 970{
 971        if (flag != 0 && flag != 1) {
 972                pr_err("Illegal value %d\n", flag);
 973                return -EINVAL;
 974        }
 975
 976        if (flag) {
 977                pr_err("dpo_emulated not supported\n");
 978                return -EINVAL;
 979        }
 980
 981        return 0;
 982}
 983
 984int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 985{
 986        if (flag != 0 && flag != 1) {
 987                pr_err("Illegal value %d\n", flag);
 988                return -EINVAL;
 989        }
 990
 991        if (flag &&
 992            dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 993                pr_err("emulate_fua_write not supported for pSCSI\n");
 994                return -EINVAL;
 995        }
 996        dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
 997        pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 998                        dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
 999        return 0;
1000}
1001
1002int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
1003{
1004        if (flag != 0 && flag != 1) {
1005                pr_err("Illegal value %d\n", flag);
1006                return -EINVAL;
1007        }
1008
1009        if (flag) {
1010                pr_err("ua read emulated not supported\n");
1011                return -EINVAL;
1012        }
1013
1014        return 0;
1015}
1016
1017int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
1018{
1019        if (flag != 0 && flag != 1) {
1020                pr_err("Illegal value %d\n", flag);
1021                return -EINVAL;
1022        }
1023        if (flag &&
1024            dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1025                pr_err("emulate_write_cache not supported for pSCSI\n");
1026                return -EINVAL;
1027        }
1028        dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1029        pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1030                        dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1031        return 0;
1032}
1033
1034int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1035{
1036        if ((flag != 0) && (flag != 1) && (flag != 2)) {
1037                pr_err("Illegal value %d\n", flag);
1038                return -EINVAL;
1039        }
1040
1041        if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1042                pr_err("dev[%p]: Unable to change SE Device"
1043                        " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1044                        " exists\n", dev,
1045                        atomic_read(&dev->dev_export_obj.obj_access_count));
1046                return -EINVAL;
1047        }
1048        dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1049        pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1050                dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1051
1052        return 0;
1053}
1054
1055int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1056{
1057        if ((flag != 0) && (flag != 1)) {
1058                pr_err("Illegal value %d\n", flag);
1059                return -EINVAL;
1060        }
1061
1062        if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1063                pr_err("dev[%p]: Unable to change SE Device TAS while"
1064                        " dev_export_obj: %d count exists\n", dev,
1065                        atomic_read(&dev->dev_export_obj.obj_access_count));
1066                return -EINVAL;
1067        }
1068        dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1069        pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1070                dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1071
1072        return 0;
1073}
1074
1075int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1076{
1077        if ((flag != 0) && (flag != 1)) {
1078                pr_err("Illegal value %d\n", flag);
1079                return -EINVAL;
1080        }
1081        /*
1082         * We expect this value to be non-zero when generic Block Layer
1083         * Discard supported is detected iblock_create_virtdevice().
1084         */
1085        if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1086                pr_err("Generic Block Discard not supported\n");
1087                return -ENOSYS;
1088        }
1089
1090        dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1091        pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1092                                dev, flag);
1093        return 0;
1094}
1095
1096int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1097{
1098        if ((flag != 0) && (flag != 1)) {
1099                pr_err("Illegal value %d\n", flag);
1100                return -EINVAL;
1101        }
1102        /*
1103         * We expect this value to be non-zero when generic Block Layer
1104         * Discard supported is detected iblock_create_virtdevice().
1105         */
1106        if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1107                pr_err("Generic Block Discard not supported\n");
1108                return -ENOSYS;
1109        }
1110
1111        dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1112        pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1113                                dev, flag);
1114        return 0;
1115}
1116
1117int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1118{
1119        if ((flag != 0) && (flag != 1)) {
1120                pr_err("Illegal value %d\n", flag);
1121                return -EINVAL;
1122        }
1123        dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1124        pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1125                (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1126        return 0;
1127}
1128
1129int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1130{
1131        if ((flag != 0) && (flag != 1)) {
1132                printk(KERN_ERR "Illegal value %d\n", flag);
1133                return -EINVAL;
1134        }
1135        dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
1136        pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1137               dev, flag);
1138        return 0;
1139}
1140
1141int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1142{
1143        if (flag != 0) {
1144                printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1145                        " reordering not implemented\n", dev);
1146                return -ENOSYS;
1147        }
1148        dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1149        pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1150        return 0;
1151}
1152
1153/*
1154 * Note, this can only be called on unexported SE Device Object.
1155 */
1156int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1157{
1158        if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1159                pr_err("dev[%p]: Unable to change SE Device TCQ while"
1160                        " dev_export_obj: %d count exists\n", dev,
1161                        atomic_read(&dev->dev_export_obj.obj_access_count));
1162                return -EINVAL;
1163        }
1164        if (!queue_depth) {
1165                pr_err("dev[%p]: Illegal ZERO value for queue"
1166                        "_depth\n", dev);
1167                return -EINVAL;
1168        }
1169
1170        if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1171                if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1172                        pr_err("dev[%p]: Passed queue_depth: %u"
1173                                " exceeds TCM/SE_Device TCQ: %u\n",
1174                                dev, queue_depth,
1175                                dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1176                        return -EINVAL;
1177                }
1178        } else {
1179                if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1180                        if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1181                                pr_err("dev[%p]: Passed queue_depth:"
1182                                        " %u exceeds TCM/SE_Device MAX"
1183                                        " TCQ: %u\n", dev, queue_depth,
1184                                        dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1185                                return -EINVAL;
1186                        }
1187                }
1188        }
1189
1190        dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1191        pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1192                        dev, queue_depth);
1193        return 0;
1194}
1195
1196int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
1197{
1198        if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1199                pr_err("dev[%p]: Unable to change SE Device"
1200                        " fabric_max_sectors while dev_export_obj: %d count exists\n",
1201                        dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1202                return -EINVAL;
1203        }
1204        if (!fabric_max_sectors) {
1205                pr_err("dev[%p]: Illegal ZERO value for"
1206                        " fabric_max_sectors\n", dev);
1207                return -EINVAL;
1208        }
1209        if (fabric_max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1210                pr_err("dev[%p]: Passed fabric_max_sectors: %u less than"
1211                        " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, fabric_max_sectors,
1212                                DA_STATUS_MAX_SECTORS_MIN);
1213                return -EINVAL;
1214        }
1215        if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1216                if (fabric_max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1217                        pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1218                                " greater than TCM/SE_Device max_sectors:"
1219                                " %u\n", dev, fabric_max_sectors,
1220                                dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1221                         return -EINVAL;
1222                }
1223        } else {
1224                if (fabric_max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1225                        pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1226                                " greater than DA_STATUS_MAX_SECTORS_MAX:"
1227                                " %u\n", dev, fabric_max_sectors,
1228                                DA_STATUS_MAX_SECTORS_MAX);
1229                        return -EINVAL;
1230                }
1231        }
1232        /*
1233         * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1234         */
1235        fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
1236                                                      dev->se_sub_dev->se_dev_attrib.block_size);
1237
1238        dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = fabric_max_sectors;
1239        pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1240                        dev, fabric_max_sectors);
1241        return 0;
1242}
1243
1244int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1245{
1246        if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1247                pr_err("dev[%p]: Unable to change SE Device"
1248                        " optimal_sectors while dev_export_obj: %d count exists\n",
1249                        dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1250                return -EINVAL;
1251        }
1252        if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1253                pr_err("dev[%p]: Passed optimal_sectors cannot be"
1254                                " changed for TCM/pSCSI\n", dev);
1255                return -EINVAL;
1256        }
1257        if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.fabric_max_sectors) {
1258                pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1259                        " greater than fabric_max_sectors: %u\n", dev,
1260                        optimal_sectors, dev->se_sub_dev->se_dev_attrib.fabric_max_sectors);
1261                return -EINVAL;
1262        }
1263
1264        dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1265        pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1266                        dev, optimal_sectors);
1267        return 0;
1268}
1269
1270int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1271{
1272        if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1273                pr_err("dev[%p]: Unable to change SE Device block_size"
1274                        " while dev_export_obj: %d count exists\n", dev,
1275                        atomic_read(&dev->dev_export_obj.obj_access_count));
1276                return -EINVAL;
1277        }
1278
1279        if ((block_size != 512) &&
1280            (block_size != 1024) &&
1281            (block_size != 2048) &&
1282            (block_size != 4096)) {
1283                pr_err("dev[%p]: Illegal value for block_device: %u"
1284                        " for SE device, must be 512, 1024, 2048 or 4096\n",
1285                        dev, block_size);
1286                return -EINVAL;
1287        }
1288
1289        if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1290                pr_err("dev[%p]: Not allowed to change block_size for"
1291                        " Physical Device, use for Linux/SCSI to change"
1292                        " block_size for underlying hardware\n", dev);
1293                return -EINVAL;
1294        }
1295
1296        dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1297        pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1298                        dev, block_size);
1299        return 0;
1300}
1301
1302struct se_lun *core_dev_add_lun(
1303        struct se_portal_group *tpg,
1304        struct se_device *dev,
1305        u32 lun)
1306{
1307        struct se_lun *lun_p;
1308        int rc;
1309
1310        if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1311                pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1312                        atomic_read(&dev->dev_access_obj.obj_access_count));
1313                return ERR_PTR(-EACCES);
1314        }
1315
1316        lun_p = core_tpg_pre_addlun(tpg, lun);
1317        if (IS_ERR(lun_p))
1318                return lun_p;
1319
1320        rc = core_tpg_post_addlun(tpg, lun_p,
1321                                TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1322        if (rc < 0)
1323                return ERR_PTR(rc);
1324
1325        pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1326                " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1327                tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1328                tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
1329        /*
1330         * Update LUN maps for dynamically added initiators when
1331         * generate_node_acl is enabled.
1332         */
1333        if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1334                struct se_node_acl *acl;
1335                spin_lock_irq(&tpg->acl_node_lock);
1336                list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1337                        if (acl->dynamic_node_acl &&
1338                            (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1339                             !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1340                                spin_unlock_irq(&tpg->acl_node_lock);
1341                                core_tpg_add_node_to_devs(acl, tpg);
1342                                spin_lock_irq(&tpg->acl_node_lock);
1343                        }
1344                }
1345                spin_unlock_irq(&tpg->acl_node_lock);
1346        }
1347
1348        return lun_p;
1349}
1350
1351/*      core_dev_del_lun():
1352 *
1353 *
1354 */
1355int core_dev_del_lun(
1356        struct se_portal_group *tpg,
1357        u32 unpacked_lun)
1358{
1359        struct se_lun *lun;
1360
1361        lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1362        if (IS_ERR(lun))
1363                return PTR_ERR(lun);
1364
1365        core_tpg_post_dellun(tpg, lun);
1366
1367        pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1368                " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1369                tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1370                tpg->se_tpg_tfo->get_fabric_name());
1371
1372        return 0;
1373}
1374
1375struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1376{
1377        struct se_lun *lun;
1378
1379        spin_lock(&tpg->tpg_lun_lock);
1380        if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1381                pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1382                        "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1383                        tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1384                        TRANSPORT_MAX_LUNS_PER_TPG-1,
1385                        tpg->se_tpg_tfo->tpg_get_tag(tpg));
1386                spin_unlock(&tpg->tpg_lun_lock);
1387                return NULL;
1388        }
1389        lun = tpg->tpg_lun_list[unpacked_lun];
1390
1391        if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1392                pr_err("%s Logical Unit Number: %u is not free on"
1393                        " Target Portal Group: %hu, ignoring request.\n",
1394                        tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1395                        tpg->se_tpg_tfo->tpg_get_tag(tpg));
1396                spin_unlock(&tpg->tpg_lun_lock);
1397                return NULL;
1398        }
1399        spin_unlock(&tpg->tpg_lun_lock);
1400
1401        return lun;
1402}
1403
1404/*      core_dev_get_lun():
1405 *
1406 *
1407 */
1408static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1409{
1410        struct se_lun *lun;
1411
1412        spin_lock(&tpg->tpg_lun_lock);
1413        if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1414                pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1415                        "_TPG-1: %u for Target Portal Group: %hu\n",
1416                        tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1417                        TRANSPORT_MAX_LUNS_PER_TPG-1,
1418                        tpg->se_tpg_tfo->tpg_get_tag(tpg));
1419                spin_unlock(&tpg->tpg_lun_lock);
1420                return NULL;
1421        }
1422        lun = tpg->tpg_lun_list[unpacked_lun];
1423
1424        if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1425                pr_err("%s Logical Unit Number: %u is not active on"
1426                        " Target Portal Group: %hu, ignoring request.\n",
1427                        tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1428                        tpg->se_tpg_tfo->tpg_get_tag(tpg));
1429                spin_unlock(&tpg->tpg_lun_lock);
1430                return NULL;
1431        }
1432        spin_unlock(&tpg->tpg_lun_lock);
1433
1434        return lun;
1435}
1436
1437struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1438        struct se_portal_group *tpg,
1439        u32 mapped_lun,
1440        char *initiatorname,
1441        int *ret)
1442{
1443        struct se_lun_acl *lacl;
1444        struct se_node_acl *nacl;
1445
1446        if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1447                pr_err("%s InitiatorName exceeds maximum size.\n",
1448                        tpg->se_tpg_tfo->get_fabric_name());
1449                *ret = -EOVERFLOW;
1450                return NULL;
1451        }
1452        nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1453        if (!nacl) {
1454                *ret = -EINVAL;
1455                return NULL;
1456        }
1457        lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1458        if (!lacl) {
1459                pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1460                *ret = -ENOMEM;
1461                return NULL;
1462        }
1463
1464        INIT_LIST_HEAD(&lacl->lacl_list);
1465        lacl->mapped_lun = mapped_lun;
1466        lacl->se_lun_nacl = nacl;
1467        snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1468
1469        return lacl;
1470}
1471
1472int core_dev_add_initiator_node_lun_acl(
1473        struct se_portal_group *tpg,
1474        struct se_lun_acl *lacl,
1475        u32 unpacked_lun,
1476        u32 lun_access)
1477{
1478        struct se_lun *lun;
1479        struct se_node_acl *nacl;
1480
1481        lun = core_dev_get_lun(tpg, unpacked_lun);
1482        if (!lun) {
1483                pr_err("%s Logical Unit Number: %u is not active on"
1484                        " Target Portal Group: %hu, ignoring request.\n",
1485                        tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1486                        tpg->se_tpg_tfo->tpg_get_tag(tpg));
1487                return -EINVAL;
1488        }
1489
1490        nacl = lacl->se_lun_nacl;
1491        if (!nacl)
1492                return -EINVAL;
1493
1494        if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1495            (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1496                lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1497
1498        lacl->se_lun = lun;
1499
1500        if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
1501                        lun_access, nacl, tpg) < 0)
1502                return -EINVAL;
1503
1504        spin_lock(&lun->lun_acl_lock);
1505        list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1506        atomic_inc(&lun->lun_acl_count);
1507        smp_mb__after_atomic_inc();
1508        spin_unlock(&lun->lun_acl_lock);
1509
1510        pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1511                " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1512                tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1513                (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1514                lacl->initiatorname);
1515        /*
1516         * Check to see if there are any existing persistent reservation APTPL
1517         * pre-registrations that need to be enabled for this LUN ACL..
1518         */
1519        core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1520        return 0;
1521}
1522
1523/*      core_dev_del_initiator_node_lun_acl():
1524 *
1525 *
1526 */
1527int core_dev_del_initiator_node_lun_acl(
1528        struct se_portal_group *tpg,
1529        struct se_lun *lun,
1530        struct se_lun_acl *lacl)
1531{
1532        struct se_node_acl *nacl;
1533
1534        nacl = lacl->se_lun_nacl;
1535        if (!nacl)
1536                return -EINVAL;
1537
1538        spin_lock(&lun->lun_acl_lock);
1539        list_del(&lacl->lacl_list);
1540        atomic_dec(&lun->lun_acl_count);
1541        smp_mb__after_atomic_dec();
1542        spin_unlock(&lun->lun_acl_lock);
1543
1544        core_disable_device_list_for_node(lun, NULL, lacl->mapped_lun,
1545                TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
1546
1547        lacl->se_lun = NULL;
1548
1549        pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1550                " InitiatorNode: %s Mapped LUN: %u\n",
1551                tpg->se_tpg_tfo->get_fabric_name(),
1552                tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1553                lacl->initiatorname, lacl->mapped_lun);
1554
1555        return 0;
1556}
1557
1558void core_dev_free_initiator_node_lun_acl(
1559        struct se_portal_group *tpg,
1560        struct se_lun_acl *lacl)
1561{
1562        pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1563                " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1564                tpg->se_tpg_tfo->tpg_get_tag(tpg),
1565                tpg->se_tpg_tfo->get_fabric_name(),
1566                lacl->initiatorname, lacl->mapped_lun);
1567
1568        kfree(lacl);
1569}
1570
1571int core_dev_setup_virtual_lun0(void)
1572{
1573        struct se_hba *hba;
1574        struct se_device *dev;
1575        struct se_subsystem_dev *se_dev = NULL;
1576        struct se_subsystem_api *t;
1577        char buf[16];
1578        int ret;
1579
1580        hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1581        if (IS_ERR(hba))
1582                return PTR_ERR(hba);
1583
1584        lun0_hba = hba;
1585        t = hba->transport;
1586
1587        se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1588        if (!se_dev) {
1589                pr_err("Unable to allocate memory for"
1590                                " struct se_subsystem_dev\n");
1591                ret = -ENOMEM;
1592                goto out;
1593        }
1594        INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1595        spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1596        INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1597        INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1598        spin_lock_init(&se_dev->t10_pr.registration_lock);
1599        spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1600        INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1601        spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1602        spin_lock_init(&se_dev->se_dev_lock);
1603        se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1604        se_dev->t10_wwn.t10_sub_dev = se_dev;
1605        se_dev->t10_alua.t10_sub_dev = se_dev;
1606        se_dev->se_dev_attrib.da_sub_dev = se_dev;
1607        se_dev->se_dev_hba = hba;
1608
1609        se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1610        if (!se_dev->se_dev_su_ptr) {
1611                pr_err("Unable to locate subsystem dependent pointer"
1612                        " from allocate_virtdevice()\n");
1613                ret = -ENOMEM;
1614                goto out;
1615        }
1616        lun0_su_dev = se_dev;
1617
1618        memset(buf, 0, 16);
1619        sprintf(buf, "rd_pages=8");
1620        t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1621
1622        dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1623        if (IS_ERR(dev)) {
1624                ret = PTR_ERR(dev);
1625                goto out;
1626        }
1627        dev->dev_link_magic = SE_DEV_LINK_MAGIC;
1628        se_dev->se_dev_ptr = dev;
1629        g_lun0_dev = dev;
1630
1631        return 0;
1632out:
1633        lun0_su_dev = NULL;
1634        kfree(se_dev);
1635        if (lun0_hba) {
1636                core_delete_hba(lun0_hba);
1637                lun0_hba = NULL;
1638        }
1639        return ret;
1640}
1641
1642
1643void core_dev_release_virtual_lun0(void)
1644{
1645        struct se_hba *hba = lun0_hba;
1646        struct se_subsystem_dev *su_dev = lun0_su_dev;
1647
1648        if (!hba)
1649                return;
1650
1651        if (g_lun0_dev)
1652                se_free_virtual_device(g_lun0_dev, hba);
1653
1654        kfree(su_dev);
1655        core_delete_hba(hba);
1656}
1657
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