kernel/drivers/vhost/scsi.c

   1 /*******************************************************************************
   2  * Vhost kernel TCM fabric driver for virtio SCSI initiators
   3  *
   4  * (C) Copyright 2010-2013 Datera, Inc.
   5  * (C) Copyright 2010-2012 IBM Corp.
   6  *
   7  * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
   8  *
   9  * Authors: Nicholas A. Bellinger <nab@daterainc.com>
  10  *          Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  ****************************************************************************/
  23
  24 #include <linux/module.h>
  25 #include <linux/moduleparam.h>
  26 #include <generated/utsrelease.h>
  27 #include <linux/utsname.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30 #include <linux/kthread.h>
  31 #include <linux/types.h>
  32 #include <linux/string.h>
  33 #include <linux/configfs.h>
  34 #include <linux/ctype.h>
  35 #include <linux/compat.h>
  36 #include <linux/eventfd.h>
  37 #include <linux/fs.h>
  38 #include <linux/miscdevice.h>
  39 #include <asm/unaligned.h>
  40 #include <scsi/scsi.h>
  41 #include <target/target_core_base.h>
  42 #include <target/target_core_fabric.h>
  43 #include <target/target_core_fabric_configfs.h>
  44 #include <target/target_core_configfs.h>
  45 #include <target/configfs_macros.h>
  46 #include <linux/vhost.h>
  47 #include <linux/virtio_scsi.h>
  48 #include <linux/llist.h>
  49 #include <linux/bitmap.h>
  50 #include <linux/percpu_ida.h>
  51
  52 #include "vhost.h"
  53
  54 #define VHOST_SCSI_VERSION  "v0.1"
  55 #define VHOST_SCSI_NAMELEN 256
  56 #define VHOST_SCSI_MAX_CDB_SIZE 32
  57 #define VHOST_SCSI_DEFAULT_TAGS 256
  58 #define VHOST_SCSI_PREALLOC_SGLS 2048
  59 #define VHOST_SCSI_PREALLOC_UPAGES 2048
  60 #define VHOST_SCSI_PREALLOC_PROT_SGLS 512
  61
  62 struct vhost_scsi_inflight {
  63         /* Wait for the flush operation to finish */
  64         struct completion comp;
  65         /* Refcount for the inflight reqs */
  66         struct kref kref;
  67 };
  68
  69 struct vhost_scsi_cmd {
  70         /* Descriptor from vhost_get_vq_desc() for virt_queue segment */
  71         int tvc_vq_desc;
  72         /* virtio-scsi initiator task attribute */
  73         int tvc_task_attr;
  74         /* virtio-scsi response incoming iovecs */
  75         int tvc_in_iovs;
  76         /* virtio-scsi initiator data direction */
  77         enum dma_data_direction tvc_data_direction;
  78         /* Expected data transfer length from virtio-scsi header */
  79         u32 tvc_exp_data_len;
  80         /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */
  81         u64 tvc_tag;
  82         /* The number of scatterlists associated with this cmd */
  83         u32 tvc_sgl_count;
  84         u32 tvc_prot_sgl_count;
  85         /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */
  86         u32 tvc_lun;
  87         /* Pointer to the SGL formatted memory from virtio-scsi */
  88         struct scatterlist *tvc_sgl;
  89         struct scatterlist *tvc_prot_sgl;
  90         struct page **tvc_upages;
  91         /* Pointer to response header iovec */
  92         struct iovec *tvc_resp_iov;
  93         /* Pointer to vhost_scsi for our device */
  94         struct vhost_scsi *tvc_vhost;
  95         /* Pointer to vhost_virtqueue for the cmd */
  96         struct vhost_virtqueue *tvc_vq;
  97         /* Pointer to vhost nexus memory */
  98         struct vhost_scsi_nexus *tvc_nexus;
  99         /* The TCM I/O descriptor that is accessed via container_of() */
 100         struct se_cmd tvc_se_cmd;
 101         /* work item used for cmwq dispatch to vhost_scsi_submission_work() */
 102         struct work_struct work;
 103         /* Copy of the incoming SCSI command descriptor block (CDB) */
 104         unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE];
 105         /* Sense buffer that will be mapped into outgoing status */
 106         unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER];
 107         /* Completed commands list, serviced from vhost worker thread */
 108         struct llist_node tvc_completion_list;
 109         /* Used to track inflight cmd */
 110         struct vhost_scsi_inflight *inflight;
 111 };
 112
 113 struct vhost_scsi_nexus {
 114         /* Pointer to TCM session for I_T Nexus */
 115         struct se_session *tvn_se_sess;
 116 };
 117
 118 struct vhost_scsi_nacl {
 119         /* Binary World Wide unique Port Name for Vhost Initiator port */
 120         u64 iport_wwpn;
 121         /* ASCII formatted WWPN for Sas Initiator port */
 122         char iport_name[VHOST_SCSI_NAMELEN];
 123         /* Returned by vhost_scsi_make_nodeacl() */
 124         struct se_node_acl se_node_acl;
 125 };
 126
 127 struct vhost_scsi_tpg {
 128         /* Vhost port target portal group tag for TCM */
 129         u16 tport_tpgt;
 130         /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */
 131         int tv_tpg_port_count;
 132         /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */
 133         int tv_tpg_vhost_count;
 134         /* Used for enabling T10-PI with legacy devices */
 135         int tv_fabric_prot_type;
 136         /* list for vhost_scsi_list */
 137         struct list_head tv_tpg_list;
 138         /* Used to protect access for tpg_nexus */
 139         struct mutex tv_tpg_mutex;
 140         /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */
 141         struct vhost_scsi_nexus *tpg_nexus;
 142         /* Pointer back to vhost_scsi_tport */
 143         struct vhost_scsi_tport *tport;
 144         /* Returned by vhost_scsi_make_tpg() */
 145         struct se_portal_group se_tpg;
 146         /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */
 147         struct vhost_scsi *vhost_scsi;
 148 };
 149
 150 struct vhost_scsi_tport {
 151         /* SCSI protocol the tport is providing */
 152         u8 tport_proto_id;
 153         /* Binary World Wide unique Port Name for Vhost Target port */
 154         u64 tport_wwpn;
 155         /* ASCII formatted WWPN for Vhost Target port */
 156         char tport_name[VHOST_SCSI_NAMELEN];
 157         /* Returned by vhost_scsi_make_tport() */
 158         struct se_wwn tport_wwn;
 159 };
 160
 161 struct vhost_scsi_evt {
 162         /* event to be sent to guest */
 163         struct virtio_scsi_event event;
 164         /* event list, serviced from vhost worker thread */
 165         struct llist_node list;
 166 };
 167
 168 enum {
 169         VHOST_SCSI_VQ_CTL = 0,
 170         VHOST_SCSI_VQ_EVT = 1,
 171         VHOST_SCSI_VQ_IO = 2,
 172 };
 173
 174 /* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */
 175 enum {
 176         VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) |
 177                                                (1ULL << VIRTIO_SCSI_F_T10_PI) |
 178                                                (1ULL << VIRTIO_F_ANY_LAYOUT) |
 179                                                (1ULL << VIRTIO_F_VERSION_1)
 180 };
 181
 182 #define VHOST_SCSI_MAX_TARGET   256
 183 #define VHOST_SCSI_MAX_VQ       128
 184 #define VHOST_SCSI_MAX_EVENT    128
 185
 186 struct vhost_scsi_virtqueue {
 187         struct vhost_virtqueue vq;
 188         /*
 189          * Reference counting for inflight reqs, used for flush operation. At
 190          * each time, one reference tracks new commands submitted, while we
 191          * wait for another one to reach 0.
 192          */
 193         struct vhost_scsi_inflight inflights[2];
 194         /*
 195          * Indicate current inflight in use, protected by vq->mutex.
 196          * Writers must also take dev mutex and flush under it.
 197          */
 198         int inflight_idx;
 199 };
 200
 201 struct vhost_scsi {
 202         /* Protected by vhost_scsi->dev.mutex */
 203         struct vhost_scsi_tpg **vs_tpg;
 204         char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
 205
 206         struct vhost_dev dev;
 207         struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ];
 208
 209         struct vhost_work vs_completion_work; /* cmd completion work item */
 210         struct llist_head vs_completion_list; /* cmd completion queue */
 211
 212         struct vhost_work vs_event_work; /* evt injection work item */
 213         struct llist_head vs_event_list; /* evt injection queue */
 214
 215         bool vs_events_missed; /* any missed events, protected by vq->mutex */
 216         int vs_events_nr; /* num of pending events, protected by vq->mutex */
 217 };
 218
 219 static struct target_core_fabric_ops vhost_scsi_ops;
 220 static struct workqueue_struct *vhost_scsi_workqueue;
 221
 222 /* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */
 223 static DEFINE_MUTEX(vhost_scsi_mutex);
 224 static LIST_HEAD(vhost_scsi_list);
 225
 226 static int iov_num_pages(void __user *iov_base, size_t iov_len)
 227 {
 228         return (PAGE_ALIGN((unsigned long)iov_base + iov_len) -
 229                ((unsigned long)iov_base & PAGE_MASK)) >> PAGE_SHIFT;
 230 }
 231
 232 static void vhost_scsi_done_inflight(struct kref *kref)
 233 {
 234         struct vhost_scsi_inflight *inflight;
 235
 236         inflight = container_of(kref, struct vhost_scsi_inflight, kref);
 237         complete(&inflight->comp);
 238 }
 239
 240 static void vhost_scsi_init_inflight(struct vhost_scsi *vs,
 241                                     struct vhost_scsi_inflight *old_inflight[])
 242 {
 243         struct vhost_scsi_inflight *new_inflight;
 244         struct vhost_virtqueue *vq;
 245         int idx, i;
 246
 247         for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
 248                 vq = &vs->vqs[i].vq;
 249
 250                 mutex_lock(&vq->mutex);
 251
 252                 /* store old infight */
 253                 idx = vs->vqs[i].inflight_idx;
 254                 if (old_inflight)
 255                         old_inflight[i] = &vs->vqs[i].inflights[idx];
 256
 257                 /* setup new infight */
 258                 vs->vqs[i].inflight_idx = idx ^ 1;
 259                 new_inflight = &vs->vqs[i].inflights[idx ^ 1];
 260                 kref_init(&new_inflight->kref);
 261                 init_completion(&new_inflight->comp);
 262
 263                 mutex_unlock(&vq->mutex);
 264         }
 265 }
 266
 267 static struct vhost_scsi_inflight *
 268 vhost_scsi_get_inflight(struct vhost_virtqueue *vq)
 269 {
 270         struct vhost_scsi_inflight *inflight;
 271         struct vhost_scsi_virtqueue *svq;
 272
 273         svq = container_of(vq, struct vhost_scsi_virtqueue, vq);
 274         inflight = &svq->inflights[svq->inflight_idx];
 275         kref_get(&inflight->kref);
 276
 277         return inflight;
 278 }
 279
 280 static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight)
 281 {
 282         kref_put(&inflight->kref, vhost_scsi_done_inflight);
 283 }
 284
 285 static int vhost_scsi_check_true(struct se_portal_group *se_tpg)
 286 {
 287         return 1;
 288 }
 289
 290 static int vhost_scsi_check_false(struct se_portal_group *se_tpg)
 291 {
 292         return 0;
 293 }
 294
 295 static char *vhost_scsi_get_fabric_name(void)
 296 {
 297         return "vhost";
 298 }
 299
 300 static u8 vhost_scsi_get_fabric_proto_ident(struct se_portal_group *se_tpg)
 301 {
 302         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
 303                                 struct vhost_scsi_tpg, se_tpg);
 304         struct vhost_scsi_tport *tport = tpg->tport;
 305
 306         switch (tport->tport_proto_id) {
 307         case SCSI_PROTOCOL_SAS:
 308                 return sas_get_fabric_proto_ident(se_tpg);
 309         case SCSI_PROTOCOL_FCP:
 310                 return fc_get_fabric_proto_ident(se_tpg);
 311         case SCSI_PROTOCOL_ISCSI:
 312                 return iscsi_get_fabric_proto_ident(se_tpg);
 313         default:
 314                 pr_err("Unknown tport_proto_id: 0x%02x, using"
 315                         " SAS emulation\n", tport->tport_proto_id);
 316                 break;
 317         }
 318
 319         return sas_get_fabric_proto_ident(se_tpg);
 320 }
 321
 322 static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg)
 323 {
 324         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
 325                                 struct vhost_scsi_tpg, se_tpg);
 326         struct vhost_scsi_tport *tport = tpg->tport;
 327
 328         return &tport->tport_name[0];
 329 }
 330
 331 static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg)
 332 {
 333         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
 334                                 struct vhost_scsi_tpg, se_tpg);
 335         return tpg->tport_tpgt;
 336 }
 337
 338 static u32 vhost_scsi_get_default_depth(struct se_portal_group *se_tpg)
 339 {
 340         return 1;
 341 }
 342
 343 static u32
 344 vhost_scsi_get_pr_transport_id(struct se_portal_group *se_tpg,
 345                               struct se_node_acl *se_nacl,
 346                               struct t10_pr_registration *pr_reg,
 347                               int *format_code,
 348                               unsigned char *buf)
 349 {
 350         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
 351                                 struct vhost_scsi_tpg, se_tpg);
 352         struct vhost_scsi_tport *tport = tpg->tport;
 353
 354         switch (tport->tport_proto_id) {
 355         case SCSI_PROTOCOL_SAS:
 356                 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
 357                                         format_code, buf);
 358         case SCSI_PROTOCOL_FCP:
 359                 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
 360                                         format_code, buf);
 361         case SCSI_PROTOCOL_ISCSI:
 362                 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
 363                                         format_code, buf);
 364         default:
 365                 pr_err("Unknown tport_proto_id: 0x%02x, using"
 366                         " SAS emulation\n", tport->tport_proto_id);
 367                 break;
 368         }
 369
 370         return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
 371                         format_code, buf);
 372 }
 373
 374 static u32
 375 vhost_scsi_get_pr_transport_id_len(struct se_portal_group *se_tpg,
 376                                   struct se_node_acl *se_nacl,
 377                                   struct t10_pr_registration *pr_reg,
 378                                   int *format_code)
 379 {
 380         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
 381                                 struct vhost_scsi_tpg, se_tpg);
 382         struct vhost_scsi_tport *tport = tpg->tport;
 383
 384         switch (tport->tport_proto_id) {
 385         case SCSI_PROTOCOL_SAS:
 386                 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
 387                                         format_code);
 388         case SCSI_PROTOCOL_FCP:
 389                 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
 390                                         format_code);
 391         case SCSI_PROTOCOL_ISCSI:
 392                 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
 393                                         format_code);
 394         default:
 395                 pr_err("Unknown tport_proto_id: 0x%02x, using"
 396                         " SAS emulation\n", tport->tport_proto_id);
 397                 break;
 398         }
 399
 400         return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
 401                         format_code);
 402 }
 403
 404 static char *
 405 vhost_scsi_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
 406                                     const char *buf,
 407                                     u32 *out_tid_len,
 408                                     char **port_nexus_ptr)
 409 {
 410         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
 411                                 struct vhost_scsi_tpg, se_tpg);
 412         struct vhost_scsi_tport *tport = tpg->tport;
 413
 414         switch (tport->tport_proto_id) {
 415         case SCSI_PROTOCOL_SAS:
 416                 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
 417                                         port_nexus_ptr);
 418         case SCSI_PROTOCOL_FCP:
 419                 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
 420                                         port_nexus_ptr);
 421         case SCSI_PROTOCOL_ISCSI:
 422                 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
 423                                         port_nexus_ptr);
 424         default:
 425                 pr_err("Unknown tport_proto_id: 0x%02x, using"
 426                         " SAS emulation\n", tport->tport_proto_id);
 427                 break;
 428         }
 429
 430         return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
 431                         port_nexus_ptr);
 432 }
 433
 434 static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg)
 435 {
 436         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
 437                                 struct vhost_scsi_tpg, se_tpg);
 438
 439         return tpg->tv_fabric_prot_type;
 440 }
 441
 442 static struct se_node_acl *
 443 vhost_scsi_alloc_fabric_acl(struct se_portal_group *se_tpg)
 444 {
 445         struct vhost_scsi_nacl *nacl;
 446
 447         nacl = kzalloc(sizeof(struct vhost_scsi_nacl), GFP_KERNEL);
 448         if (!nacl) {
 449                 pr_err("Unable to allocate struct vhost_scsi_nacl\n");
 450                 return NULL;
 451         }
 452
 453         return &nacl->se_node_acl;
 454 }
 455
 456 static void
 457 vhost_scsi_release_fabric_acl(struct se_portal_group *se_tpg,
 458                              struct se_node_acl *se_nacl)
 459 {
 460         struct vhost_scsi_nacl *nacl = container_of(se_nacl,
 461                         struct vhost_scsi_nacl, se_node_acl);
 462         kfree(nacl);
 463 }
 464
 465 static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg)
 466 {
 467         return 1;
 468 }
 469
 470 static void vhost_scsi_release_cmd(struct se_cmd *se_cmd)
 471 {
 472         struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd,
 473                                 struct vhost_scsi_cmd, tvc_se_cmd);
 474         struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess;
 475         int i;
 476
 477         if (tv_cmd->tvc_sgl_count) {
 478                 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
 479                         put_page(sg_page(&tv_cmd->tvc_sgl[i]));
 480         }
 481         if (tv_cmd->tvc_prot_sgl_count) {
 482                 for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++)
 483                         put_page(sg_page(&tv_cmd->tvc_prot_sgl[i]));
 484         }
 485
 486         vhost_scsi_put_inflight(tv_cmd->inflight);
 487         percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag);
 488 }
 489
 490 static int vhost_scsi_shutdown_session(struct se_session *se_sess)
 491 {
 492         return 0;
 493 }
 494
 495 static void vhost_scsi_close_session(struct se_session *se_sess)
 496 {
 497         return;
 498 }
 499
 500 static u32 vhost_scsi_sess_get_index(struct se_session *se_sess)
 501 {
 502         return 0;
 503 }
 504
 505 static int vhost_scsi_write_pending(struct se_cmd *se_cmd)
 506 {
 507         /* Go ahead and process the write immediately */
 508         target_execute_cmd(se_cmd);
 509         return 0;
 510 }
 511
 512 static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd)
 513 {
 514         return 0;
 515 }
 516
 517 static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl)
 518 {
 519         return;
 520 }
 521
 522 static u32 vhost_scsi_get_task_tag(struct se_cmd *se_cmd)
 523 {
 524         return 0;
 525 }
 526
 527 static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd)
 528 {
 529         return 0;
 530 }
 531
 532 static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd)
 533 {
 534         struct vhost_scsi *vs = cmd->tvc_vhost;
 535
 536         llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list);
 537
 538         vhost_work_queue(&vs->dev, &vs->vs_completion_work);
 539 }
 540
 541 static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd)
 542 {
 543         struct vhost_scsi_cmd *cmd = container_of(se_cmd,
 544                                 struct vhost_scsi_cmd, tvc_se_cmd);
 545         vhost_scsi_complete_cmd(cmd);
 546         return 0;
 547 }
 548
 549 static int vhost_scsi_queue_status(struct se_cmd *se_cmd)
 550 {
 551         struct vhost_scsi_cmd *cmd = container_of(se_cmd,
 552                                 struct vhost_scsi_cmd, tvc_se_cmd);
 553         vhost_scsi_complete_cmd(cmd);
 554         return 0;
 555 }
 556
 557 static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd)
 558 {
 559         return;
 560 }
 561
 562 static void vhost_scsi_aborted_task(struct se_cmd *se_cmd)
 563 {
 564         return;
 565 }
 566
 567 static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
 568 {
 569         vs->vs_events_nr--;
 570         kfree(evt);
 571 }
 572
 573 static struct vhost_scsi_evt *
 574 vhost_scsi_allocate_evt(struct vhost_scsi *vs,
 575                        u32 event, u32 reason)
 576 {
 577         struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
 578         struct vhost_scsi_evt *evt;
 579
 580         if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
 581                 vs->vs_events_missed = true;
 582                 return NULL;
 583         }
 584
 585         evt = kzalloc(sizeof(*evt), GFP_KERNEL);
 586         if (!evt) {
 587                 vq_err(vq, "Failed to allocate vhost_scsi_evt\n");
 588                 vs->vs_events_missed = true;
 589                 return NULL;
 590         }
 591
 592         evt->event.event = cpu_to_vhost32(vq, event);
 593         evt->event.reason = cpu_to_vhost32(vq, reason);
 594         vs->vs_events_nr++;
 595
 596         return evt;
 597 }
 598
 599 static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd)
 600 {
 601         struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
 602
 603         /* TODO locking against target/backend threads? */
 604         transport_generic_free_cmd(se_cmd, 0);
 605
 606 }
 607
 608 static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd)
 609 {
 610         return target_put_sess_cmd(se_cmd->se_sess, se_cmd);
 611 }
 612
 613 static void
 614 vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
 615 {
 616         struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
 617         struct virtio_scsi_event *event = &evt->event;
 618         struct virtio_scsi_event __user *eventp;
 619         unsigned out, in;
 620         int head, ret;
 621
 622         if (!vq->private_data) {
 623                 vs->vs_events_missed = true;
 624                 return;
 625         }
 626
 627 again:
 628         vhost_disable_notify(&vs->dev, vq);
 629         head = vhost_get_vq_desc(vq, vq->iov,
 630                         ARRAY_SIZE(vq->iov), &out, &in,
 631                         NULL, NULL);
 632         if (head < 0) {
 633                 vs->vs_events_missed = true;
 634                 return;
 635         }
 636         if (head == vq->num) {
 637                 if (vhost_enable_notify(&vs->dev, vq))
 638                         goto again;
 639                 vs->vs_events_missed = true;
 640                 return;
 641         }
 642
 643         if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
 644                 vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
 645                                 vq->iov[out].iov_len);
 646                 vs->vs_events_missed = true;
 647                 return;
 648         }
 649
 650         if (vs->vs_events_missed) {
 651                 event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED);
 652                 vs->vs_events_missed = false;
 653         }
 654
 655         eventp = vq->iov[out].iov_base;
 656         ret = __copy_to_user(eventp, event, sizeof(*event));
 657         if (!ret)
 658                 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
 659         else
 660                 vq_err(vq, "Faulted on vhost_scsi_send_event\n");
 661 }
 662
 663 static void vhost_scsi_evt_work(struct vhost_work *work)
 664 {
 665         struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
 666                                         vs_event_work);
 667         struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
 668         struct vhost_scsi_evt *evt;
 669         struct llist_node *llnode;
 670
 671         mutex_lock(&vq->mutex);
 672         llnode = llist_del_all(&vs->vs_event_list);
 673         while (llnode) {
 674                 evt = llist_entry(llnode, struct vhost_scsi_evt, list);
 675                 llnode = llist_next(llnode);
 676                 vhost_scsi_do_evt_work(vs, evt);
 677                 vhost_scsi_free_evt(vs, evt);
 678         }
 679         mutex_unlock(&vq->mutex);
 680 }
 681
 682 /* Fill in status and signal that we are done processing this command
 683  *
 684  * This is scheduled in the vhost work queue so we are called with the owner
 685  * process mm and can access the vring.
 686  */
 687 static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
 688 {
 689         struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
 690                                         vs_completion_work);
 691         DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
 692         struct virtio_scsi_cmd_resp v_rsp;
 693         struct vhost_scsi_cmd *cmd;
 694         struct llist_node *llnode;
 695         struct se_cmd *se_cmd;
 696         struct iov_iter iov_iter;
 697         int ret, vq;
 698
 699         bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
 700         llnode = llist_del_all(&vs->vs_completion_list);
 701         while (llnode) {
 702                 cmd = llist_entry(llnode, struct vhost_scsi_cmd,
 703                                      tvc_completion_list);
 704                 llnode = llist_next(llnode);
 705                 se_cmd = &cmd->tvc_se_cmd;
 706
 707                 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
 708                         cmd, se_cmd->residual_count, se_cmd->scsi_status);
 709
 710                 memset(&v_rsp, 0, sizeof(v_rsp));
 711                 v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count);
 712                 /* TODO is status_qualifier field needed? */
 713                 v_rsp.status = se_cmd->scsi_status;
 714                 v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq,
 715                                                  se_cmd->scsi_sense_length);
 716                 memcpy(v_rsp.sense, cmd->tvc_sense_buf,
 717                        se_cmd->scsi_sense_length);
 718
 719                 iov_iter_init(&iov_iter, READ, cmd->tvc_resp_iov,
 720                               cmd->tvc_in_iovs, sizeof(v_rsp));
 721                 ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter);
 722                 if (likely(ret == sizeof(v_rsp))) {
 723                         struct vhost_scsi_virtqueue *q;
 724                         vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
 725                         q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
 726                         vq = q - vs->vqs;
 727                         __set_bit(vq, signal);
 728                 } else
 729                         pr_err("Faulted on virtio_scsi_cmd_resp\n");
 730
 731                 vhost_scsi_free_cmd(cmd);
 732         }
 733
 734         vq = -1;
 735         while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1))
 736                 < VHOST_SCSI_MAX_VQ)
 737                 vhost_signal(&vs->dev, &vs->vqs[vq].vq);
 738 }
 739
 740 static struct vhost_scsi_cmd *
 741 vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg,
 742                    unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
 743                    u32 exp_data_len, int data_direction)
 744 {
 745         struct vhost_scsi_cmd *cmd;
 746         struct vhost_scsi_nexus *tv_nexus;
 747         struct se_session *se_sess;
 748         struct scatterlist *sg, *prot_sg;
 749         struct page **pages;
 750         int tag;
 751
 752         tv_nexus = tpg->tpg_nexus;
 753         if (!tv_nexus) {
 754                 pr_err("Unable to locate active struct vhost_scsi_nexus\n");
 755                 return ERR_PTR(-EIO);
 756         }
 757         se_sess = tv_nexus->tvn_se_sess;
 758
 759         tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING);
 760         if (tag < 0) {
 761                 pr_err("Unable to obtain tag for vhost_scsi_cmd\n");
 762                 return ERR_PTR(-ENOMEM);
 763         }
 764
 765         cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag];
 766         sg = cmd->tvc_sgl;
 767         prot_sg = cmd->tvc_prot_sgl;
 768         pages = cmd->tvc_upages;
 769         memset(cmd, 0, sizeof(struct vhost_scsi_cmd));
 770
 771         cmd->tvc_sgl = sg;
 772         cmd->tvc_prot_sgl = prot_sg;
 773         cmd->tvc_upages = pages;
 774         cmd->tvc_se_cmd.map_tag = tag;
 775         cmd->tvc_tag = scsi_tag;
 776         cmd->tvc_lun = lun;
 777         cmd->tvc_task_attr = task_attr;
 778         cmd->tvc_exp_data_len = exp_data_len;
 779         cmd->tvc_data_direction = data_direction;
 780         cmd->tvc_nexus = tv_nexus;
 781         cmd->inflight = vhost_scsi_get_inflight(vq);
 782
 783         memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE);
 784
 785         return cmd;
 786 }
 787
 788 /*
 789  * Map a user memory range into a scatterlist
 790  *
 791  * Returns the number of scatterlist entries used or -errno on error.
 792  */
 793 static int
 794 vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd,
 795                       void __user *ptr,
 796                       size_t len,
 797                       struct scatterlist *sgl,
 798                       bool write)
 799 {
 800         unsigned int npages = 0, offset, nbytes;
 801         unsigned int pages_nr = iov_num_pages(ptr, len);
 802         struct scatterlist *sg = sgl;
 803         struct page **pages = cmd->tvc_upages;
 804         int ret, i;
 805
 806         if (pages_nr > VHOST_SCSI_PREALLOC_UPAGES) {
 807                 pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than"
 808                        " preallocated VHOST_SCSI_PREALLOC_UPAGES: %u\n",
 809                         pages_nr, VHOST_SCSI_PREALLOC_UPAGES);
 810                 return -ENOBUFS;
 811         }
 812
 813         ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages);
 814         /* No pages were pinned */
 815         if (ret < 0)
 816                 goto out;
 817         /* Less pages pinned than wanted */
 818         if (ret != pages_nr) {
 819                 for (i = 0; i < ret; i++)
 820                         put_page(pages[i]);
 821                 ret = -EFAULT;
 822                 goto out;
 823         }
 824
 825         while (len > 0) {
 826                 offset = (uintptr_t)ptr & ~PAGE_MASK;
 827                 nbytes = min_t(unsigned int, PAGE_SIZE - offset, len);
 828                 sg_set_page(sg, pages[npages], nbytes, offset);
 829                 ptr += nbytes;
 830                 len -= nbytes;
 831                 sg++;
 832                 npages++;
 833         }
 834
 835 out:
 836         return ret;
 837 }
 838
 839 static int
 840 vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls)
 841 {
 842         int sgl_count = 0;
 843
 844         if (!iter || !iter->iov) {
 845                 pr_err("%s: iter->iov is NULL, but expected bytes: %zu"
 846                        " present\n", __func__, bytes);
 847                 return -EINVAL;
 848         }
 849
 850         sgl_count = iov_iter_npages(iter, 0xffff);
 851         if (sgl_count > max_sgls) {
 852                 pr_err("%s: requested sgl_count: %d exceeds pre-allocated"
 853                        " max_sgls: %d\n", __func__, sgl_count, max_sgls);
 854                 return -EINVAL;
 855         }
 856         return sgl_count;
 857 }
 858
 859 static int
 860 vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write,
 861                       struct iov_iter *iter,
 862                       struct scatterlist *sg, int sg_count)
 863 {
 864         size_t off = iter->iov_offset;
 865         int i, ret;
 866
 867         for (i = 0; i < iter->nr_segs; i++) {
 868                 void __user *base = iter->iov[i].iov_base + off;
 869                 size_t len = iter->iov[i].iov_len - off;
 870
 871                 ret = vhost_scsi_map_to_sgl(cmd, base, len, sg, write);
 872                 if (ret < 0) {
 873                         for (i = 0; i < sg_count; i++) {
 874                                 struct page *page = sg_page(&sg[i]);
 875                                 if (page)
 876                                         put_page(page);
 877                         }
 878                         return ret;
 879                 }
 880                 sg += ret;
 881                 off = 0;
 882         }
 883         return 0;
 884 }
 885
 886 static int
 887 vhost_scsi_mapal(struct vhost_scsi_cmd *cmd,
 888                  size_t prot_bytes, struct iov_iter *prot_iter,
 889                  size_t data_bytes, struct iov_iter *data_iter)
 890 {
 891         int sgl_count, ret;
 892         bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE);
 893
 894         if (prot_bytes) {
 895                 sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes,
 896                                                  VHOST_SCSI_PREALLOC_PROT_SGLS);
 897                 if (sgl_count < 0)
 898                         return sgl_count;
 899
 900                 sg_init_table(cmd->tvc_prot_sgl, sgl_count);
 901                 cmd->tvc_prot_sgl_count = sgl_count;
 902                 pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__,
 903                          cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count);
 904
 905                 ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter,
 906                                             cmd->tvc_prot_sgl,
 907                                             cmd->tvc_prot_sgl_count);
 908                 if (ret < 0) {
 909                         cmd->tvc_prot_sgl_count = 0;
 910                         return ret;
 911                 }
 912         }
 913         sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes,
 914                                          VHOST_SCSI_PREALLOC_SGLS);
 915         if (sgl_count < 0)
 916                 return sgl_count;
 917
 918         sg_init_table(cmd->tvc_sgl, sgl_count);
 919         cmd->tvc_sgl_count = sgl_count;
 920         pr_debug("%s data_sg %p data_sgl_count %u\n", __func__,
 921                   cmd->tvc_sgl, cmd->tvc_sgl_count);
 922
 923         ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter,
 924                                     cmd->tvc_sgl, cmd->tvc_sgl_count);
 925         if (ret < 0) {
 926                 cmd->tvc_sgl_count = 0;
 927                 return ret;
 928         }
 929         return 0;
 930 }
 931
 932 static int vhost_scsi_to_tcm_attr(int attr)
 933 {
 934         switch (attr) {
 935         case VIRTIO_SCSI_S_SIMPLE:
 936                 return TCM_SIMPLE_TAG;
 937         case VIRTIO_SCSI_S_ORDERED:
 938                 return TCM_ORDERED_TAG;
 939         case VIRTIO_SCSI_S_HEAD:
 940                 return TCM_HEAD_TAG;
 941         case VIRTIO_SCSI_S_ACA:
 942                 return TCM_ACA_TAG;
 943         default:
 944                 break;
 945         }
 946         return TCM_SIMPLE_TAG;
 947 }
 948
 949 static void vhost_scsi_submission_work(struct work_struct *work)
 950 {
 951         struct vhost_scsi_cmd *cmd =
 952                 container_of(work, struct vhost_scsi_cmd, work);
 953         struct vhost_scsi_nexus *tv_nexus;
 954         struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
 955         struct scatterlist *sg_ptr, *sg_prot_ptr = NULL;
 956         int rc;
 957
 958         /* FIXME: BIDI operation */
 959         if (cmd->tvc_sgl_count) {
 960                 sg_ptr = cmd->tvc_sgl;
 961
 962                 if (cmd->tvc_prot_sgl_count)
 963                         sg_prot_ptr = cmd->tvc_prot_sgl;
 964                 else
 965                         se_cmd->prot_pto = true;
 966         } else {
 967                 sg_ptr = NULL;
 968         }
 969         tv_nexus = cmd->tvc_nexus;
 970
 971         rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
 972                         cmd->tvc_cdb, &cmd->tvc_sense_buf[0],
 973                         cmd->tvc_lun, cmd->tvc_exp_data_len,
 974                         vhost_scsi_to_tcm_attr(cmd->tvc_task_attr),
 975                         cmd->tvc_data_direction, TARGET_SCF_ACK_KREF,
 976                         sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr,
 977                         cmd->tvc_prot_sgl_count);
 978         if (rc < 0) {
 979                 transport_send_check_condition_and_sense(se_cmd,
 980                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
 981                 transport_generic_free_cmd(se_cmd, 0);
 982         }
 983 }
 984
 985 static void
 986 vhost_scsi_send_bad_target(struct vhost_scsi *vs,
 987                            struct vhost_virtqueue *vq,
 988                            int head, unsigned out)
 989 {
 990         struct virtio_scsi_cmd_resp __user *resp;
 991         struct virtio_scsi_cmd_resp rsp;
 992         int ret;
 993
 994         memset(&rsp, 0, sizeof(rsp));
 995         rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
 996         resp = vq->iov[out].iov_base;
 997         ret = __copy_to_user(resp, &rsp, sizeof(rsp));
 998         if (!ret)
 999                 vhost_add_used_and_signal(&vs->dev, vq, head, 0);
1000         else
1001                 pr_err("Faulted on virtio_scsi_cmd_resp\n");
1002 }
1003
1004 static void
1005 vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
1006 {
1007         struct vhost_scsi_tpg **vs_tpg, *tpg;
1008         struct virtio_scsi_cmd_req v_req;
1009         struct virtio_scsi_cmd_req_pi v_req_pi;
1010         struct vhost_scsi_cmd *cmd;
1011         struct iov_iter out_iter, in_iter, prot_iter, data_iter;
1012         u64 tag;
1013         u32 exp_data_len, data_direction;
1014         unsigned out, in;
1015         int head, ret, prot_bytes;
1016         size_t req_size, rsp_size = sizeof(struct virtio_scsi_cmd_resp);
1017         size_t out_size, in_size;
1018         u16 lun;
1019         u8 *target, *lunp, task_attr;
1020         bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI);
1021         void *req, *cdb;
1022
1023         mutex_lock(&vq->mutex);
1024         /*
1025          * We can handle the vq only after the endpoint is setup by calling the
1026          * VHOST_SCSI_SET_ENDPOINT ioctl.
1027          */
1028         vs_tpg = vq->private_data;
1029         if (!vs_tpg)
1030                 goto out;
1031
1032         vhost_disable_notify(&vs->dev, vq);
1033
1034         for (;;) {
1035                 head = vhost_get_vq_desc(vq, vq->iov,
1036                                          ARRAY_SIZE(vq->iov), &out, &in,
1037                                          NULL, NULL);
1038                 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
1039                          head, out, in);
1040                 /* On error, stop handling until the next kick. */
1041                 if (unlikely(head < 0))
1042                         break;
1043                 /* Nothing new?  Wait for eventfd to tell us they refilled. */
1044                 if (head == vq->num) {
1045                         if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
1046                                 vhost_disable_notify(&vs->dev, vq);
1047                                 continue;
1048                         }
1049                         break;
1050                 }
1051                 /*
1052                  * Check for a sane response buffer so we can report early
1053                  * errors back to the guest.
1054                  */
1055                 if (unlikely(vq->iov[out].iov_len < rsp_size)) {
1056                         vq_err(vq, "Expecting at least virtio_scsi_cmd_resp"
1057                                 " size, got %zu bytes\n", vq->iov[out].iov_len);
1058                         break;
1059                 }
1060                 /*
1061                  * Setup pointers and values based upon different virtio-scsi
1062                  * request header if T10_PI is enabled in KVM guest.
1063                  */
1064                 if (t10_pi) {
1065                         req = &v_req_pi;
1066                         req_size = sizeof(v_req_pi);
1067                         lunp = &v_req_pi.lun[0];
1068                         target = &v_req_pi.lun[1];
1069                 } else {
1070                         req = &v_req;
1071                         req_size = sizeof(v_req);
1072                         lunp = &v_req.lun[0];
1073                         target = &v_req.lun[1];
1074                 }
1075                 /*
1076                  * FIXME: Not correct for BIDI operation
1077                  */
1078                 out_size = iov_length(vq->iov, out);
1079                 in_size = iov_length(&vq->iov[out], in);
1080
1081                 /*
1082                  * Copy over the virtio-scsi request header, which for a
1083                  * ANY_LAYOUT enabled guest may span multiple iovecs, or a
1084                  * single iovec may contain both the header + outgoing
1085                  * WRITE payloads.
1086                  *
1087                  * copy_from_iter() will advance out_iter, so that it will
1088                  * point at the start of the outgoing WRITE payload, if
1089                  * DMA_TO_DEVICE is set.
1090                  */
1091                 iov_iter_init(&out_iter, WRITE, vq->iov, out, out_size);
1092
1093                 ret = copy_from_iter(req, req_size, &out_iter);
1094                 if (unlikely(ret != req_size)) {
1095                         vq_err(vq, "Faulted on copy_from_iter\n");
1096                         vhost_scsi_send_bad_target(vs, vq, head, out);
1097                         continue;
1098                 }
1099                 /* virtio-scsi spec requires byte 0 of the lun to be 1 */
1100                 if (unlikely(*lunp != 1)) {
1101                         vq_err(vq, "Illegal virtio-scsi lun: %u\n", *lunp);
1102                         vhost_scsi_send_bad_target(vs, vq, head, out);
1103                         continue;
1104                 }
1105
1106                 tpg = ACCESS_ONCE(vs_tpg[*target]);
1107                 if (unlikely(!tpg)) {
1108                         /* Target does not exist, fail the request */
1109                         vhost_scsi_send_bad_target(vs, vq, head, out);
1110                         continue;
1111                 }
1112                 /*
1113                  * Determine data_direction by calculating the total outgoing
1114                  * iovec sizes + incoming iovec sizes vs. virtio-scsi request +
1115                  * response headers respectively.
1116                  *
1117                  * For DMA_TO_DEVICE this is out_iter, which is already pointing
1118                  * to the right place.
1119                  *
1120                  * For DMA_FROM_DEVICE, the iovec will be just past the end
1121                  * of the virtio-scsi response header in either the same
1122                  * or immediately following iovec.
1123                  *
1124                  * Any associated T10_PI bytes for the outgoing / incoming
1125                  * payloads are included in calculation of exp_data_len here.
1126                  */
1127                 prot_bytes = 0;
1128
1129                 if (out_size > req_size) {
1130                         data_direction = DMA_TO_DEVICE;
1131                         exp_data_len = out_size - req_size;
1132                         data_iter = out_iter;
1133                 } else if (in_size > rsp_size) {
1134                         data_direction = DMA_FROM_DEVICE;
1135                         exp_data_len = in_size - rsp_size;
1136
1137                         iov_iter_init(&in_iter, READ, &vq->iov[out], in,
1138                                       rsp_size + exp_data_len);
1139                         iov_iter_advance(&in_iter, rsp_size);
1140                         data_iter = in_iter;
1141                 } else {
1142                         data_direction = DMA_NONE;
1143                         exp_data_len = 0;
1144                 }
1145                 /*
1146                  * If T10_PI header + payload is present, setup prot_iter values
1147                  * and recalculate data_iter for vhost_scsi_mapal() mapping to
1148                  * host scatterlists via get_user_pages_fast().
1149                  */
1150                 if (t10_pi) {
1151                         if (v_req_pi.pi_bytesout) {
1152                                 if (data_direction != DMA_TO_DEVICE) {
1153                                         vq_err(vq, "Received non zero pi_bytesout,"
1154                                                 " but wrong data_direction\n");
1155                                         vhost_scsi_send_bad_target(vs, vq, head, out);
1156                                         continue;
1157                                 }
1158                                 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout);
1159                         } else if (v_req_pi.pi_bytesin) {
1160                                 if (data_direction != DMA_FROM_DEVICE) {
1161                                         vq_err(vq, "Received non zero pi_bytesin,"
1162                                                 " but wrong data_direction\n");
1163                                         vhost_scsi_send_bad_target(vs, vq, head, out);
1164                                         continue;
1165                                 }
1166                                 prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin);
1167                         }
1168                         /*
1169                          * Set prot_iter to data_iter, and advance past any
1170                          * preceeding prot_bytes that may be present.
1171                          *
1172                          * Also fix up the exp_data_len to reflect only the
1173                          * actual data payload length.
1174                          */
1175                         if (prot_bytes) {
1176                                 exp_data_len -= prot_bytes;
1177                                 prot_iter = data_iter;
1178                                 iov_iter_advance(&data_iter, prot_bytes);
1179                         }
1180                         tag = vhost64_to_cpu(vq, v_req_pi.tag);
1181                         task_attr = v_req_pi.task_attr;
1182                         cdb = &v_req_pi.cdb[0];
1183                         lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF;
1184                 } else {
1185                         tag = vhost64_to_cpu(vq, v_req.tag);
1186                         task_attr = v_req.task_attr;
1187                         cdb = &v_req.cdb[0];
1188                         lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
1189                 }
1190                 /*
1191                  * Check that the received CDB size does not exceeded our
1192                  * hardcoded max for vhost-scsi, then get a pre-allocated
1193                  * cmd descriptor for the new virtio-scsi tag.
1194                  *
1195                  * TODO what if cdb was too small for varlen cdb header?
1196                  */
1197                 if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) {
1198                         vq_err(vq, "Received SCSI CDB with command_size: %d that"
1199                                 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1200                                 scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE);
1201                         vhost_scsi_send_bad_target(vs, vq, head, out);
1202                         continue;
1203                 }
1204                 cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr,
1205                                          exp_data_len + prot_bytes,
1206                                          data_direction);
1207                 if (IS_ERR(cmd)) {
1208                         vq_err(vq, "vhost_scsi_get_tag failed %ld\n",
1209                                PTR_ERR(cmd));
1210                         vhost_scsi_send_bad_target(vs, vq, head, out);
1211                         continue;
1212                 }
1213                 cmd->tvc_vhost = vs;
1214                 cmd->tvc_vq = vq;
1215                 cmd->tvc_resp_iov = &vq->iov[out];
1216                 cmd->tvc_in_iovs = in;
1217
1218                 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
1219                          cmd->tvc_cdb[0], cmd->tvc_lun);
1220                 pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:"
1221                          " %d\n", cmd, exp_data_len, prot_bytes, data_direction);
1222
1223                 if (data_direction != DMA_NONE) {
1224                         ret = vhost_scsi_mapal(cmd,
1225                                                prot_bytes, &prot_iter,
1226                                                exp_data_len, &data_iter);
1227                         if (unlikely(ret)) {
1228                                 vq_err(vq, "Failed to map iov to sgl\n");
1229                                 vhost_scsi_release_cmd(&cmd->tvc_se_cmd);
1230                                 vhost_scsi_send_bad_target(vs, vq, head, out);
1231                                 continue;
1232                         }
1233                 }
1234                 /*
1235                  * Save the descriptor from vhost_get_vq_desc() to be used to
1236                  * complete the virtio-scsi request in TCM callback context via
1237                  * vhost_scsi_queue_data_in() and vhost_scsi_queue_status()
1238                  */
1239                 cmd->tvc_vq_desc = head;
1240                 /*
1241                  * Dispatch cmd descriptor for cmwq execution in process
1242                  * context provided by vhost_scsi_workqueue.  This also ensures
1243                  * cmd is executed on the same kworker CPU as this vhost
1244                  * thread to gain positive L2 cache locality effects.
1245                  */
1246                 INIT_WORK(&cmd->work, vhost_scsi_submission_work);
1247                 queue_work(vhost_scsi_workqueue, &cmd->work);
1248         }
1249 out:
1250         mutex_unlock(&vq->mutex);
1251 }
1252
1253 static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
1254 {
1255         pr_debug("%s: The handling func for control queue.\n", __func__);
1256 }
1257
1258 static void
1259 vhost_scsi_send_evt(struct vhost_scsi *vs,
1260                    struct vhost_scsi_tpg *tpg,
1261                    struct se_lun *lun,
1262                    u32 event,
1263                    u32 reason)
1264 {
1265         struct vhost_scsi_evt *evt;
1266
1267         evt = vhost_scsi_allocate_evt(vs, event, reason);
1268         if (!evt)
1269                 return;
1270
1271         if (tpg && lun) {
1272                 /* TODO: share lun setup code with virtio-scsi.ko */
1273                 /*
1274                  * Note: evt->event is zeroed when we allocate it and
1275                  * lun[4-7] need to be zero according to virtio-scsi spec.
1276                  */
1277                 evt->event.lun[0] = 0x01;
1278                 evt->event.lun[1] = tpg->tport_tpgt;
1279                 if (lun->unpacked_lun >= 256)
1280                         evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
1281                 evt->event.lun[3] = lun->unpacked_lun & 0xFF;
1282         }
1283
1284         llist_add(&evt->list, &vs->vs_event_list);
1285         vhost_work_queue(&vs->dev, &vs->vs_event_work);
1286 }
1287
1288 static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
1289 {
1290         struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1291                                                 poll.work);
1292         struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1293
1294         mutex_lock(&vq->mutex);
1295         if (!vq->private_data)
1296                 goto out;
1297
1298         if (vs->vs_events_missed)
1299                 vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
1300 out:
1301         mutex_unlock(&vq->mutex);
1302 }
1303
1304 static void vhost_scsi_handle_kick(struct vhost_work *work)
1305 {
1306         struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1307                                                 poll.work);
1308         struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1309
1310         vhost_scsi_handle_vq(vs, vq);
1311 }
1312
1313 static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
1314 {
1315         vhost_poll_flush(&vs->vqs[index].vq.poll);
1316 }
1317
1318 /* Callers must hold dev mutex */
1319 static void vhost_scsi_flush(struct vhost_scsi *vs)
1320 {
1321         struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ];
1322         int i;
1323
1324         /* Init new inflight and remember the old inflight */
1325         vhost_scsi_init_inflight(vs, old_inflight);
1326
1327         /*
1328          * The inflight->kref was initialized to 1. We decrement it here to
1329          * indicate the start of the flush operation so that it will reach 0
1330          * when all the reqs are finished.
1331          */
1332         for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1333                 kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight);
1334
1335         /* Flush both the vhost poll and vhost work */
1336         for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1337                 vhost_scsi_flush_vq(vs, i);
1338         vhost_work_flush(&vs->dev, &vs->vs_completion_work);
1339         vhost_work_flush(&vs->dev, &vs->vs_event_work);
1340
1341         /* Wait for all reqs issued before the flush to be finished */
1342         for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1343                 wait_for_completion(&old_inflight[i]->comp);
1344 }
1345
1346 /*
1347  * Called from vhost_scsi_ioctl() context to walk the list of available
1348  * vhost_scsi_tpg with an active struct vhost_scsi_nexus
1349  *
1350  *  The lock nesting rule is:
1351  *    vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
1352  */
1353 static int
1354 vhost_scsi_set_endpoint(struct vhost_scsi *vs,
1355                         struct vhost_scsi_target *t)
1356 {
1357         struct se_portal_group *se_tpg;
1358         struct vhost_scsi_tport *tv_tport;
1359         struct vhost_scsi_tpg *tpg;
1360         struct vhost_scsi_tpg **vs_tpg;
1361         struct vhost_virtqueue *vq;
1362         int index, ret, i, len;
1363         bool match = false;
1364
1365         mutex_lock(&vhost_scsi_mutex);
1366         mutex_lock(&vs->dev.mutex);
1367
1368         /* Verify that ring has been setup correctly. */
1369         for (index = 0; index < vs->dev.nvqs; ++index) {
1370                 /* Verify that ring has been setup correctly. */
1371                 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1372                         ret = -EFAULT;
1373                         goto out;
1374                 }
1375         }
1376
1377         len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
1378         vs_tpg = kzalloc(len, GFP_KERNEL);
1379         if (!vs_tpg) {
1380                 ret = -ENOMEM;
1381                 goto out;
1382         }
1383         if (vs->vs_tpg)
1384                 memcpy(vs_tpg, vs->vs_tpg, len);
1385
1386         list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) {
1387                 mutex_lock(&tpg->tv_tpg_mutex);
1388                 if (!tpg->tpg_nexus) {
1389                         mutex_unlock(&tpg->tv_tpg_mutex);
1390                         continue;
1391                 }
1392                 if (tpg->tv_tpg_vhost_count != 0) {
1393                         mutex_unlock(&tpg->tv_tpg_mutex);
1394                         continue;
1395                 }
1396                 tv_tport = tpg->tport;
1397
1398                 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1399                         if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) {
1400                                 kfree(vs_tpg);
1401                                 mutex_unlock(&tpg->tv_tpg_mutex);
1402                                 ret = -EEXIST;
1403                                 goto out;
1404                         }
1405                         /*
1406                          * In order to ensure individual vhost-scsi configfs
1407                          * groups cannot be removed while in use by vhost ioctl,
1408                          * go ahead and take an explicit se_tpg->tpg_group.cg_item
1409                          * dependency now.
1410                          */
1411                         se_tpg = &tpg->se_tpg;
1412                         ret = target_depend_item(&se_tpg->tpg_group.cg_item);
1413                         if (ret) {
1414                                 pr_warn("configfs_depend_item() failed: %d\n", ret);
1415                                 kfree(vs_tpg);
1416                                 mutex_unlock(&tpg->tv_tpg_mutex);
1417                                 goto out;
1418                         }
1419                         tpg->tv_tpg_vhost_count++;
1420                         tpg->vhost_scsi = vs;
1421                         vs_tpg[tpg->tport_tpgt] = tpg;
1422                         smp_mb__after_atomic();
1423                         match = true;
1424                 }
1425                 mutex_unlock(&tpg->tv_tpg_mutex);
1426         }
1427
1428         if (match) {
1429                 memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
1430                        sizeof(vs->vs_vhost_wwpn));
1431                 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1432                         vq = &vs->vqs[i].vq;
1433                         mutex_lock(&vq->mutex);
1434                         vq->private_data = vs_tpg;
1435                         vhost_init_used(vq);
1436                         mutex_unlock(&vq->mutex);
1437                 }
1438                 ret = 0;
1439         } else {
1440                 ret = -EEXIST;
1441         }
1442
1443         /*
1444          * Act as synchronize_rcu to make sure access to
1445          * old vs->vs_tpg is finished.
1446          */
1447         vhost_scsi_flush(vs);
1448         kfree(vs->vs_tpg);
1449         vs->vs_tpg = vs_tpg;
1450
1451 out:
1452         mutex_unlock(&vs->dev.mutex);
1453         mutex_unlock(&vhost_scsi_mutex);
1454         return ret;
1455 }
1456
1457 static int
1458 vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
1459                           struct vhost_scsi_target *t)
1460 {
1461         struct se_portal_group *se_tpg;
1462         struct vhost_scsi_tport *tv_tport;
1463         struct vhost_scsi_tpg *tpg;
1464         struct vhost_virtqueue *vq;
1465         bool match = false;
1466         int index, ret, i;
1467         u8 target;
1468
1469         mutex_lock(&vhost_scsi_mutex);
1470         mutex_lock(&vs->dev.mutex);
1471         /* Verify that ring has been setup correctly. */
1472         for (index = 0; index < vs->dev.nvqs; ++index) {
1473                 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1474                         ret = -EFAULT;
1475                         goto err_dev;
1476                 }
1477         }
1478
1479         if (!vs->vs_tpg) {
1480                 ret = 0;
1481                 goto err_dev;
1482         }
1483
1484         for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1485                 target = i;
1486                 tpg = vs->vs_tpg[target];
1487                 if (!tpg)
1488                         continue;
1489
1490                 mutex_lock(&tpg->tv_tpg_mutex);
1491                 tv_tport = tpg->tport;
1492                 if (!tv_tport) {
1493                         ret = -ENODEV;
1494                         goto err_tpg;
1495                 }
1496
1497                 if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1498                         pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
1499                                 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
1500                                 tv_tport->tport_name, tpg->tport_tpgt,
1501                                 t->vhost_wwpn, t->vhost_tpgt);
1502                         ret = -EINVAL;
1503                         goto err_tpg;
1504                 }
1505                 tpg->tv_tpg_vhost_count--;
1506                 tpg->vhost_scsi = NULL;
1507                 vs->vs_tpg[target] = NULL;
1508                 match = true;
1509                 mutex_unlock(&tpg->tv_tpg_mutex);
1510                 /*
1511                  * Release se_tpg->tpg_group.cg_item configfs dependency now
1512                  * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur.
1513                  */
1514                 se_tpg = &tpg->se_tpg;
1515                 target_undepend_item(&se_tpg->tpg_group.cg_item);
1516         }
1517         if (match) {
1518                 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1519                         vq = &vs->vqs[i].vq;
1520                         mutex_lock(&vq->mutex);
1521                         vq->private_data = NULL;
1522                         mutex_unlock(&vq->mutex);
1523                 }
1524         }
1525         /*
1526          * Act as synchronize_rcu to make sure access to
1527          * old vs->vs_tpg is finished.
1528          */
1529         vhost_scsi_flush(vs);
1530         kfree(vs->vs_tpg);
1531         vs->vs_tpg = NULL;
1532         WARN_ON(vs->vs_events_nr);
1533         mutex_unlock(&vs->dev.mutex);
1534         mutex_unlock(&vhost_scsi_mutex);
1535         return 0;
1536
1537 err_tpg:
1538         mutex_unlock(&tpg->tv_tpg_mutex);
1539 err_dev:
1540         mutex_unlock(&vs->dev.mutex);
1541         mutex_unlock(&vhost_scsi_mutex);
1542         return ret;
1543 }
1544
1545 static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
1546 {
1547         struct vhost_virtqueue *vq;
1548         int i;
1549
1550         if (features & ~VHOST_SCSI_FEATURES)
1551                 return -EOPNOTSUPP;
1552
1553         mutex_lock(&vs->dev.mutex);
1554         if ((features & (1 << VHOST_F_LOG_ALL)) &&
1555             !vhost_log_access_ok(&vs->dev)) {
1556                 mutex_unlock(&vs->dev.mutex);
1557                 return -EFAULT;
1558         }
1559
1560         for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1561                 vq = &vs->vqs[i].vq;
1562                 mutex_lock(&vq->mutex);
1563                 vq->acked_features = features;
1564                 mutex_unlock(&vq->mutex);
1565         }
1566         mutex_unlock(&vs->dev.mutex);
1567         return 0;
1568 }
1569
1570 static int vhost_scsi_open(struct inode *inode, struct file *f)
1571 {
1572         struct vhost_scsi *vs;
1573         struct vhost_virtqueue **vqs;
1574         int r = -ENOMEM, i;
1575
1576         vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
1577         if (!vs) {
1578                 vs = vzalloc(sizeof(*vs));
1579                 if (!vs)
1580                         goto err_vs;
1581         }
1582
1583         vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL);
1584         if (!vqs)
1585                 goto err_vqs;
1586
1587         vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work);
1588         vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work);
1589
1590         vs->vs_events_nr = 0;
1591         vs->vs_events_missed = false;
1592
1593         vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;
1594         vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1595         vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
1596         vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
1597         for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
1598                 vqs[i] = &vs->vqs[i].vq;
1599                 vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
1600         }
1601         vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ);
1602
1603         vhost_scsi_init_inflight(vs, NULL);
1604
1605         f->private_data = vs;
1606         return 0;
1607
1608 err_vqs:
1609         kvfree(vs);
1610 err_vs:
1611         return r;
1612 }
1613
1614 static int vhost_scsi_release(struct inode *inode, struct file *f)
1615 {
1616         struct vhost_scsi *vs = f->private_data;
1617         struct vhost_scsi_target t;
1618
1619         mutex_lock(&vs->dev.mutex);
1620         memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
1621         mutex_unlock(&vs->dev.mutex);
1622         vhost_scsi_clear_endpoint(vs, &t);
1623         vhost_dev_stop(&vs->dev);
1624         vhost_dev_cleanup(&vs->dev, false);
1625         /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
1626         vhost_scsi_flush(vs);
1627         kfree(vs->dev.vqs);
1628         kvfree(vs);
1629         return 0;
1630 }
1631
1632 static long
1633 vhost_scsi_ioctl(struct file *f,
1634                  unsigned int ioctl,
1635                  unsigned long arg)
1636 {
1637         struct vhost_scsi *vs = f->private_data;
1638         struct vhost_scsi_target backend;
1639         void __user *argp = (void __user *)arg;
1640         u64 __user *featurep = argp;
1641         u32 __user *eventsp = argp;
1642         u32 events_missed;
1643         u64 features;
1644         int r, abi_version = VHOST_SCSI_ABI_VERSION;
1645         struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1646
1647         switch (ioctl) {
1648         case VHOST_SCSI_SET_ENDPOINT:
1649                 if (copy_from_user(&backend, argp, sizeof backend))
1650                         return -EFAULT;
1651                 if (backend.reserved != 0)
1652                         return -EOPNOTSUPP;
1653
1654                 return vhost_scsi_set_endpoint(vs, &backend);
1655         case VHOST_SCSI_CLEAR_ENDPOINT:
1656                 if (copy_from_user(&backend, argp, sizeof backend))
1657                         return -EFAULT;
1658                 if (backend.reserved != 0)
1659                         return -EOPNOTSUPP;
1660
1661                 return vhost_scsi_clear_endpoint(vs, &backend);
1662         case VHOST_SCSI_GET_ABI_VERSION:
1663                 if (copy_to_user(argp, &abi_version, sizeof abi_version))
1664                         return -EFAULT;
1665                 return 0;
1666         case VHOST_SCSI_SET_EVENTS_MISSED:
1667                 if (get_user(events_missed, eventsp))
1668                         return -EFAULT;
1669                 mutex_lock(&vq->mutex);
1670                 vs->vs_events_missed = events_missed;
1671                 mutex_unlock(&vq->mutex);
1672                 return 0;
1673         case VHOST_SCSI_GET_EVENTS_MISSED:
1674                 mutex_lock(&vq->mutex);
1675                 events_missed = vs->vs_events_missed;
1676                 mutex_unlock(&vq->mutex);
1677                 if (put_user(events_missed, eventsp))
1678                         return -EFAULT;
1679                 return 0;
1680         case VHOST_GET_FEATURES:
1681                 features = VHOST_SCSI_FEATURES;
1682                 if (copy_to_user(featurep, &features, sizeof features))
1683                         return -EFAULT;
1684                 return 0;
1685         case VHOST_SET_FEATURES:
1686                 if (copy_from_user(&features, featurep, sizeof features))
1687                         return -EFAULT;
1688                 return vhost_scsi_set_features(vs, features);
1689         default:
1690                 mutex_lock(&vs->dev.mutex);
1691                 r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
1692                 /* TODO: flush backend after dev ioctl. */
1693                 if (r == -ENOIOCTLCMD)
1694                         r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
1695                 mutex_unlock(&vs->dev.mutex);
1696                 return r;
1697         }
1698 }
1699
1700 #ifdef CONFIG_COMPAT
1701 static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
1702                                 unsigned long arg)
1703 {
1704         return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
1705 }
1706 #endif
1707
1708 static const struct file_operations vhost_scsi_fops = {
1709         .owner          = THIS_MODULE,
1710         .release        = vhost_scsi_release,
1711         .unlocked_ioctl = vhost_scsi_ioctl,
1712 #ifdef CONFIG_COMPAT
1713         .compat_ioctl   = vhost_scsi_compat_ioctl,
1714 #endif
1715         .open           = vhost_scsi_open,
1716         .llseek         = noop_llseek,
1717 };
1718
1719 static struct miscdevice vhost_scsi_misc = {
1720         MISC_DYNAMIC_MINOR,
1721         "vhost-scsi",
1722         &vhost_scsi_fops,
1723 };
1724
1725 static int __init vhost_scsi_register(void)
1726 {
1727         return misc_register(&vhost_scsi_misc);
1728 }
1729
1730 static int vhost_scsi_deregister(void)
1731 {
1732         return misc_deregister(&vhost_scsi_misc);
1733 }
1734
1735 static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport)
1736 {
1737         switch (tport->tport_proto_id) {
1738         case SCSI_PROTOCOL_SAS:
1739                 return "SAS";
1740         case SCSI_PROTOCOL_FCP:
1741                 return "FCP";
1742         case SCSI_PROTOCOL_ISCSI:
1743                 return "iSCSI";
1744         default:
1745                 break;
1746         }
1747
1748         return "Unknown";
1749 }
1750
1751 static void
1752 vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg,
1753                   struct se_lun *lun, bool plug)
1754 {
1755
1756         struct vhost_scsi *vs = tpg->vhost_scsi;
1757         struct vhost_virtqueue *vq;
1758         u32 reason;
1759
1760         if (!vs)
1761                 return;
1762
1763         mutex_lock(&vs->dev.mutex);
1764
1765         if (plug)
1766                 reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
1767         else
1768                 reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
1769
1770         vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1771         mutex_lock(&vq->mutex);
1772         if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG))
1773                 vhost_scsi_send_evt(vs, tpg, lun,
1774                                    VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
1775         mutex_unlock(&vq->mutex);
1776         mutex_unlock(&vs->dev.mutex);
1777 }
1778
1779 static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1780 {
1781         vhost_scsi_do_plug(tpg, lun, true);
1782 }
1783
1784 static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1785 {
1786         vhost_scsi_do_plug(tpg, lun, false);
1787 }
1788
1789 static int vhost_scsi_port_link(struct se_portal_group *se_tpg,
1790                                struct se_lun *lun)
1791 {
1792         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1793                                 struct vhost_scsi_tpg, se_tpg);
1794
1795         mutex_lock(&vhost_scsi_mutex);
1796
1797         mutex_lock(&tpg->tv_tpg_mutex);
1798         tpg->tv_tpg_port_count++;
1799         mutex_unlock(&tpg->tv_tpg_mutex);
1800
1801         vhost_scsi_hotplug(tpg, lun);
1802
1803         mutex_unlock(&vhost_scsi_mutex);
1804
1805         return 0;
1806 }
1807
1808 static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg,
1809                                   struct se_lun *lun)
1810 {
1811         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1812                                 struct vhost_scsi_tpg, se_tpg);
1813
1814         mutex_lock(&vhost_scsi_mutex);
1815
1816         mutex_lock(&tpg->tv_tpg_mutex);
1817         tpg->tv_tpg_port_count--;
1818         mutex_unlock(&tpg->tv_tpg_mutex);
1819
1820         vhost_scsi_hotunplug(tpg, lun);
1821
1822         mutex_unlock(&vhost_scsi_mutex);
1823 }
1824
1825 static struct se_node_acl *
1826 vhost_scsi_make_nodeacl(struct se_portal_group *se_tpg,
1827                        struct config_group *group,
1828                        const char *name)
1829 {
1830         struct se_node_acl *se_nacl, *se_nacl_new;
1831         struct vhost_scsi_nacl *nacl;
1832         u64 wwpn = 0;
1833         u32 nexus_depth;
1834
1835         /* vhost_scsi_parse_wwn(name, &wwpn, 1) < 0)
1836                 return ERR_PTR(-EINVAL); */
1837         se_nacl_new = vhost_scsi_alloc_fabric_acl(se_tpg);
1838         if (!se_nacl_new)
1839                 return ERR_PTR(-ENOMEM);
1840
1841         nexus_depth = 1;
1842         /*
1843          * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1844          * when converting a NodeACL from demo mode -> explict
1845          */
1846         se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1847                                 name, nexus_depth);
1848         if (IS_ERR(se_nacl)) {
1849                 vhost_scsi_release_fabric_acl(se_tpg, se_nacl_new);
1850                 return se_nacl;
1851         }
1852         /*
1853          * Locate our struct vhost_scsi_nacl and set the FC Nport WWPN
1854          */
1855         nacl = container_of(se_nacl, struct vhost_scsi_nacl, se_node_acl);
1856         nacl->iport_wwpn = wwpn;
1857
1858         return se_nacl;
1859 }
1860
1861 static void vhost_scsi_drop_nodeacl(struct se_node_acl *se_acl)
1862 {
1863         struct vhost_scsi_nacl *nacl = container_of(se_acl,
1864                                 struct vhost_scsi_nacl, se_node_acl);
1865         core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1866         kfree(nacl);
1867 }
1868
1869 static void vhost_scsi_free_cmd_map_res(struct vhost_scsi_nexus *nexus,
1870                                        struct se_session *se_sess)
1871 {
1872         struct vhost_scsi_cmd *tv_cmd;
1873         unsigned int i;
1874
1875         if (!se_sess->sess_cmd_map)
1876                 return;
1877
1878         for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1879                 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1880
1881                 kfree(tv_cmd->tvc_sgl);
1882                 kfree(tv_cmd->tvc_prot_sgl);
1883                 kfree(tv_cmd->tvc_upages);
1884         }
1885 }
1886
1887 static ssize_t vhost_scsi_tpg_attrib_store_fabric_prot_type(
1888         struct se_portal_group *se_tpg,
1889         const char *page,
1890         size_t count)
1891 {
1892         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1893                                 struct vhost_scsi_tpg, se_tpg);
1894         unsigned long val;
1895         int ret = kstrtoul(page, 0, &val);
1896
1897         if (ret) {
1898                 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
1899                 return ret;
1900         }
1901         if (val != 0 && val != 1 && val != 3) {
1902                 pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val);
1903                 return -EINVAL;
1904         }
1905         tpg->tv_fabric_prot_type = val;
1906
1907         return count;
1908 }
1909
1910 static ssize_t vhost_scsi_tpg_attrib_show_fabric_prot_type(
1911         struct se_portal_group *se_tpg,
1912         char *page)
1913 {
1914         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1915                                 struct vhost_scsi_tpg, se_tpg);
1916
1917         return sprintf(page, "%d\n", tpg->tv_fabric_prot_type);
1918 }
1919 TF_TPG_ATTRIB_ATTR(vhost_scsi, fabric_prot_type, S_IRUGO | S_IWUSR);
1920
1921 static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = {
1922         &vhost_scsi_tpg_attrib_fabric_prot_type.attr,
1923         NULL,
1924 };
1925
1926 static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
1927                                 const char *name)
1928 {
1929         struct se_portal_group *se_tpg;
1930         struct se_session *se_sess;
1931         struct vhost_scsi_nexus *tv_nexus;
1932         struct vhost_scsi_cmd *tv_cmd;
1933         unsigned int i;
1934
1935         mutex_lock(&tpg->tv_tpg_mutex);
1936         if (tpg->tpg_nexus) {
1937                 mutex_unlock(&tpg->tv_tpg_mutex);
1938                 pr_debug("tpg->tpg_nexus already exists\n");
1939                 return -EEXIST;
1940         }
1941         se_tpg = &tpg->se_tpg;
1942
1943         tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL);
1944         if (!tv_nexus) {
1945                 mutex_unlock(&tpg->tv_tpg_mutex);
1946                 pr_err("Unable to allocate struct vhost_scsi_nexus\n");
1947                 return -ENOMEM;
1948         }
1949         /*
1950          *  Initialize the struct se_session pointer and setup tagpool
1951          *  for struct vhost_scsi_cmd descriptors
1952          */
1953         tv_nexus->tvn_se_sess = transport_init_session_tags(
1954                                         VHOST_SCSI_DEFAULT_TAGS,
1955                                         sizeof(struct vhost_scsi_cmd),
1956                                         TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS);
1957         if (IS_ERR(tv_nexus->tvn_se_sess)) {
1958                 mutex_unlock(&tpg->tv_tpg_mutex);
1959                 kfree(tv_nexus);
1960                 return -ENOMEM;
1961         }
1962         se_sess = tv_nexus->tvn_se_sess;
1963         for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1964                 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1965
1966                 tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) *
1967                                         VHOST_SCSI_PREALLOC_SGLS, GFP_KERNEL);
1968                 if (!tv_cmd->tvc_sgl) {
1969                         mutex_unlock(&tpg->tv_tpg_mutex);
1970                         pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
1971                         goto out;
1972                 }
1973
1974                 tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) *
1975                                         VHOST_SCSI_PREALLOC_UPAGES, GFP_KERNEL);
1976                 if (!tv_cmd->tvc_upages) {
1977                         mutex_unlock(&tpg->tv_tpg_mutex);
1978                         pr_err("Unable to allocate tv_cmd->tvc_upages\n");
1979                         goto out;
1980                 }
1981
1982                 tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) *
1983                                         VHOST_SCSI_PREALLOC_PROT_SGLS, GFP_KERNEL);
1984                 if (!tv_cmd->tvc_prot_sgl) {
1985                         mutex_unlock(&tpg->tv_tpg_mutex);
1986                         pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
1987                         goto out;
1988                 }
1989         }
1990         /*
1991          * Since we are running in 'demo mode' this call with generate a
1992          * struct se_node_acl for the vhost_scsi struct se_portal_group with
1993          * the SCSI Initiator port name of the passed configfs group 'name'.
1994          */
1995         tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1996                                 se_tpg, (unsigned char *)name);
1997         if (!tv_nexus->tvn_se_sess->se_node_acl) {
1998                 mutex_unlock(&tpg->tv_tpg_mutex);
1999                 pr_debug("core_tpg_check_initiator_node_acl() failed"
2000                                 " for %s\n", name);
2001                 goto out;
2002         }
2003         /*
2004          * Now register the TCM vhost virtual I_T Nexus as active.
2005          */
2006         transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
2007                         tv_nexus->tvn_se_sess, tv_nexus);
2008         tpg->tpg_nexus = tv_nexus;
2009
2010         mutex_unlock(&tpg->tv_tpg_mutex);
2011         return 0;
2012
2013 out:
2014         vhost_scsi_free_cmd_map_res(tv_nexus, se_sess);
2015         transport_free_session(se_sess);
2016         kfree(tv_nexus);
2017         return -ENOMEM;
2018 }
2019
2020 static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg)
2021 {
2022         struct se_session *se_sess;
2023         struct vhost_scsi_nexus *tv_nexus;
2024
2025         mutex_lock(&tpg->tv_tpg_mutex);
2026         tv_nexus = tpg->tpg_nexus;
2027         if (!tv_nexus) {
2028                 mutex_unlock(&tpg->tv_tpg_mutex);
2029                 return -ENODEV;
2030         }
2031
2032         se_sess = tv_nexus->tvn_se_sess;
2033         if (!se_sess) {
2034                 mutex_unlock(&tpg->tv_tpg_mutex);
2035                 return -ENODEV;
2036         }
2037
2038         if (tpg->tv_tpg_port_count != 0) {
2039                 mutex_unlock(&tpg->tv_tpg_mutex);
2040                 pr_err("Unable to remove TCM_vhost I_T Nexus with"
2041                         " active TPG port count: %d\n",
2042                         tpg->tv_tpg_port_count);
2043                 return -EBUSY;
2044         }
2045
2046         if (tpg->tv_tpg_vhost_count != 0) {
2047                 mutex_unlock(&tpg->tv_tpg_mutex);
2048                 pr_err("Unable to remove TCM_vhost I_T Nexus with"
2049                         " active TPG vhost count: %d\n",
2050                         tpg->tv_tpg_vhost_count);
2051                 return -EBUSY;
2052         }
2053
2054         pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
2055                 " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport),
2056                 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
2057
2058         vhost_scsi_free_cmd_map_res(tv_nexus, se_sess);
2059         /*
2060          * Release the SCSI I_T Nexus to the emulated vhost Target Port
2061          */
2062         transport_deregister_session(tv_nexus->tvn_se_sess);
2063         tpg->tpg_nexus = NULL;
2064         mutex_unlock(&tpg->tv_tpg_mutex);
2065
2066         kfree(tv_nexus);
2067         return 0;
2068 }
2069
2070 static ssize_t vhost_scsi_tpg_show_nexus(struct se_portal_group *se_tpg,
2071                                         char *page)
2072 {
2073         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2074                                 struct vhost_scsi_tpg, se_tpg);
2075         struct vhost_scsi_nexus *tv_nexus;
2076         ssize_t ret;
2077
2078         mutex_lock(&tpg->tv_tpg_mutex);
2079         tv_nexus = tpg->tpg_nexus;
2080         if (!tv_nexus) {
2081                 mutex_unlock(&tpg->tv_tpg_mutex);
2082                 return -ENODEV;
2083         }
2084         ret = snprintf(page, PAGE_SIZE, "%s\n",
2085                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
2086         mutex_unlock(&tpg->tv_tpg_mutex);
2087
2088         return ret;
2089 }
2090
2091 static ssize_t vhost_scsi_tpg_store_nexus(struct se_portal_group *se_tpg,
2092                                          const char *page,
2093                                          size_t count)
2094 {
2095         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2096                                 struct vhost_scsi_tpg, se_tpg);
2097         struct vhost_scsi_tport *tport_wwn = tpg->tport;
2098         unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr;
2099         int ret;
2100         /*
2101          * Shutdown the active I_T nexus if 'NULL' is passed..
2102          */
2103         if (!strncmp(page, "NULL", 4)) {
2104                 ret = vhost_scsi_drop_nexus(tpg);
2105                 return (!ret) ? count : ret;
2106         }
2107         /*
2108          * Otherwise make sure the passed virtual Initiator port WWN matches
2109          * the fabric protocol_id set in vhost_scsi_make_tport(), and call
2110          * vhost_scsi_make_nexus().
2111          */
2112         if (strlen(page) >= VHOST_SCSI_NAMELEN) {
2113                 pr_err("Emulated NAA Sas Address: %s, exceeds"
2114                                 " max: %d\n", page, VHOST_SCSI_NAMELEN);
2115                 return -EINVAL;
2116         }
2117         snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page);
2118
2119         ptr = strstr(i_port, "naa.");
2120         if (ptr) {
2121                 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
2122                         pr_err("Passed SAS Initiator Port %s does not"
2123                                 " match target port protoid: %s\n", i_port,
2124                                 vhost_scsi_dump_proto_id(tport_wwn));
2125                         return -EINVAL;
2126                 }
2127                 port_ptr = &i_port[0];
2128                 goto check_newline;
2129         }
2130         ptr = strstr(i_port, "fc.");
2131         if (ptr) {
2132                 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
2133                         pr_err("Passed FCP Initiator Port %s does not"
2134                                 " match target port protoid: %s\n", i_port,
2135                                 vhost_scsi_dump_proto_id(tport_wwn));
2136                         return -EINVAL;
2137                 }
2138                 port_ptr = &i_port[3]; /* Skip over "fc." */
2139                 goto check_newline;
2140         }
2141         ptr = strstr(i_port, "iqn.");
2142         if (ptr) {
2143                 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
2144                         pr_err("Passed iSCSI Initiator Port %s does not"
2145                                 " match target port protoid: %s\n", i_port,
2146                                 vhost_scsi_dump_proto_id(tport_wwn));
2147                         return -EINVAL;
2148                 }
2149                 port_ptr = &i_port[0];
2150                 goto check_newline;
2151         }
2152         pr_err("Unable to locate prefix for emulated Initiator Port:"
2153                         " %s\n", i_port);
2154         return -EINVAL;
2155         /*
2156          * Clear any trailing newline for the NAA WWN
2157          */
2158 check_newline:
2159         if (i_port[strlen(i_port)-1] == '\n')
2160                 i_port[strlen(i_port)-1] = '\0';
2161
2162         ret = vhost_scsi_make_nexus(tpg, port_ptr);
2163         if (ret < 0)
2164                 return ret;
2165
2166         return count;
2167 }
2168
2169 TF_TPG_BASE_ATTR(vhost_scsi, nexus, S_IRUGO | S_IWUSR);
2170
2171 static struct configfs_attribute *vhost_scsi_tpg_attrs[] = {
2172         &vhost_scsi_tpg_nexus.attr,
2173         NULL,
2174 };
2175
2176 static struct se_portal_group *
2177 vhost_scsi_make_tpg(struct se_wwn *wwn,
2178                    struct config_group *group,
2179                    const char *name)
2180 {
2181         struct vhost_scsi_tport *tport = container_of(wwn,
2182                         struct vhost_scsi_tport, tport_wwn);
2183
2184         struct vhost_scsi_tpg *tpg;
2185         u16 tpgt;
2186         int ret;
2187
2188         if (strstr(name, "tpgt_") != name)
2189                 return ERR_PTR(-EINVAL);
2190         if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET)
2191                 return ERR_PTR(-EINVAL);
2192
2193         tpg = kzalloc(sizeof(struct vhost_scsi_tpg), GFP_KERNEL);
2194         if (!tpg) {
2195                 pr_err("Unable to allocate struct vhost_scsi_tpg");
2196                 return ERR_PTR(-ENOMEM);
2197         }
2198         mutex_init(&tpg->tv_tpg_mutex);
2199         INIT_LIST_HEAD(&tpg->tv_tpg_list);
2200         tpg->tport = tport;
2201         tpg->tport_tpgt = tpgt;
2202
2203         ret = core_tpg_register(&vhost_scsi_ops, wwn,
2204                                 &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
2205         if (ret < 0) {
2206                 kfree(tpg);
2207                 return NULL;
2208         }
2209         mutex_lock(&vhost_scsi_mutex);
2210         list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list);
2211         mutex_unlock(&vhost_scsi_mutex);
2212
2213         return &tpg->se_tpg;
2214 }
2215
2216 static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg)
2217 {
2218         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2219                                 struct vhost_scsi_tpg, se_tpg);
2220
2221         mutex_lock(&vhost_scsi_mutex);
2222         list_del(&tpg->tv_tpg_list);
2223         mutex_unlock(&vhost_scsi_mutex);
2224         /*
2225          * Release the virtual I_T Nexus for this vhost TPG
2226          */
2227         vhost_scsi_drop_nexus(tpg);
2228         /*
2229          * Deregister the se_tpg from TCM..
2230          */
2231         core_tpg_deregister(se_tpg);
2232         kfree(tpg);
2233 }
2234
2235 static struct se_wwn *
2236 vhost_scsi_make_tport(struct target_fabric_configfs *tf,
2237                      struct config_group *group,
2238                      const char *name)
2239 {
2240         struct vhost_scsi_tport *tport;
2241         char *ptr;
2242         u64 wwpn = 0;
2243         int off = 0;
2244
2245         /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0)
2246                 return ERR_PTR(-EINVAL); */
2247
2248         tport = kzalloc(sizeof(struct vhost_scsi_tport), GFP_KERNEL);
2249         if (!tport) {
2250                 pr_err("Unable to allocate struct vhost_scsi_tport");
2251                 return ERR_PTR(-ENOMEM);
2252         }
2253         tport->tport_wwpn = wwpn;
2254         /*
2255          * Determine the emulated Protocol Identifier and Target Port Name
2256          * based on the incoming configfs directory name.
2257          */
2258         ptr = strstr(name, "naa.");
2259         if (ptr) {
2260                 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
2261                 goto check_len;
2262         }
2263         ptr = strstr(name, "fc.");
2264         if (ptr) {
2265                 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
2266                 off = 3; /* Skip over "fc." */
2267                 goto check_len;
2268         }
2269         ptr = strstr(name, "iqn.");
2270         if (ptr) {
2271                 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
2272                 goto check_len;
2273         }
2274
2275         pr_err("Unable to locate prefix for emulated Target Port:"
2276                         " %s\n", name);
2277         kfree(tport);
2278         return ERR_PTR(-EINVAL);
2279
2280 check_len:
2281         if (strlen(name) >= VHOST_SCSI_NAMELEN) {
2282                 pr_err("Emulated %s Address: %s, exceeds"
2283                         " max: %d\n", name, vhost_scsi_dump_proto_id(tport),
2284                         VHOST_SCSI_NAMELEN);
2285                 kfree(tport);
2286                 return ERR_PTR(-EINVAL);
2287         }
2288         snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]);
2289
2290         pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
2291                 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name);
2292
2293         return &tport->tport_wwn;
2294 }
2295
2296 static void vhost_scsi_drop_tport(struct se_wwn *wwn)
2297 {
2298         struct vhost_scsi_tport *tport = container_of(wwn,
2299                                 struct vhost_scsi_tport, tport_wwn);
2300
2301         pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
2302                 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport),
2303                 tport->tport_name);
2304
2305         kfree(tport);
2306 }
2307
2308 static ssize_t
2309 vhost_scsi_wwn_show_attr_version(struct target_fabric_configfs *tf,
2310                                 char *page)
2311 {
2312         return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
2313                 "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2314                 utsname()->machine);
2315 }
2316
2317 TF_WWN_ATTR_RO(vhost_scsi, version);
2318
2319 static struct configfs_attribute *vhost_scsi_wwn_attrs[] = {
2320         &vhost_scsi_wwn_version.attr,
2321         NULL,
2322 };
2323
2324 static struct target_core_fabric_ops vhost_scsi_ops = {
2325         .module                         = THIS_MODULE,
2326         .name                           = "vhost",
2327         .get_fabric_name                = vhost_scsi_get_fabric_name,
2328         .get_fabric_proto_ident         = vhost_scsi_get_fabric_proto_ident,
2329         .tpg_get_wwn                    = vhost_scsi_get_fabric_wwn,
2330         .tpg_get_tag                    = vhost_scsi_get_tpgt,
2331         .tpg_get_default_depth          = vhost_scsi_get_default_depth,
2332         .tpg_get_pr_transport_id        = vhost_scsi_get_pr_transport_id,
2333         .tpg_get_pr_transport_id_len    = vhost_scsi_get_pr_transport_id_len,
2334         .tpg_parse_pr_out_transport_id  = vhost_scsi_parse_pr_out_transport_id,
2335         .tpg_check_demo_mode            = vhost_scsi_check_true,
2336         .tpg_check_demo_mode_cache      = vhost_scsi_check_true,
2337         .tpg_check_demo_mode_write_protect = vhost_scsi_check_false,
2338         .tpg_check_prod_mode_write_protect = vhost_scsi_check_false,
2339         .tpg_check_prot_fabric_only     = vhost_scsi_check_prot_fabric_only,
2340         .tpg_alloc_fabric_acl           = vhost_scsi_alloc_fabric_acl,
2341         .tpg_release_fabric_acl         = vhost_scsi_release_fabric_acl,
2342         .tpg_get_inst_index             = vhost_scsi_tpg_get_inst_index,
2343         .release_cmd                    = vhost_scsi_release_cmd,
2344         .check_stop_free                = vhost_scsi_check_stop_free,
2345         .shutdown_session               = vhost_scsi_shutdown_session,
2346         .close_session                  = vhost_scsi_close_session,
2347         .sess_get_index                 = vhost_scsi_sess_get_index,
2348         .sess_get_initiator_sid         = NULL,
2349         .write_pending                  = vhost_scsi_write_pending,
2350         .write_pending_status           = vhost_scsi_write_pending_status,
2351         .set_default_node_attributes    = vhost_scsi_set_default_node_attrs,
2352         .get_task_tag                   = vhost_scsi_get_task_tag,
2353         .get_cmd_state                  = vhost_scsi_get_cmd_state,
2354         .queue_data_in                  = vhost_scsi_queue_data_in,
2355         .queue_status                   = vhost_scsi_queue_status,
2356         .queue_tm_rsp                   = vhost_scsi_queue_tm_rsp,
2357         .aborted_task                   = vhost_scsi_aborted_task,
2358         /*
2359          * Setup callers for generic logic in target_core_fabric_configfs.c
2360          */
2361         .fabric_make_wwn                = vhost_scsi_make_tport,
2362         .fabric_drop_wwn                = vhost_scsi_drop_tport,
2363         .fabric_make_tpg                = vhost_scsi_make_tpg,
2364         .fabric_drop_tpg                = vhost_scsi_drop_tpg,
2365         .fabric_post_link               = vhost_scsi_port_link,
2366         .fabric_pre_unlink              = vhost_scsi_port_unlink,
2367         .fabric_make_np                 = NULL,
2368         .fabric_drop_np                 = NULL,
2369         .fabric_make_nodeacl            = vhost_scsi_make_nodeacl,
2370         .fabric_drop_nodeacl            = vhost_scsi_drop_nodeacl,
2371
2372         .tfc_wwn_attrs                  = vhost_scsi_wwn_attrs,
2373         .tfc_tpg_base_attrs             = vhost_scsi_tpg_attrs,
2374         .tfc_tpg_attrib_attrs           = vhost_scsi_tpg_attrib_attrs,
2375 };
2376
2377 static int __init vhost_scsi_init(void)
2378 {
2379         int ret = -ENOMEM;
2380
2381         pr_debug("TCM_VHOST fabric module %s on %s/%s"
2382                 " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2383                 utsname()->machine);
2384
2385         /*
2386          * Use our own dedicated workqueue for submitting I/O into
2387          * target core to avoid contention within system_wq.
2388          */
2389         vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0);
2390         if (!vhost_scsi_workqueue)
2391                 goto out;
2392
2393         ret = vhost_scsi_register();
2394         if (ret < 0)
2395                 goto out_destroy_workqueue;
2396
2397         ret = target_register_template(&vhost_scsi_ops);
2398         if (ret < 0)
2399                 goto out_vhost_scsi_deregister;
2400
2401         return 0;
2402
2403 out_vhost_scsi_deregister:
2404         vhost_scsi_deregister();
2405 out_destroy_workqueue:
2406         destroy_workqueue(vhost_scsi_workqueue);
2407 out:
2408         return ret;
2409 };
2410
2411 static void vhost_scsi_exit(void)
2412 {
2413         target_unregister_template(&vhost_scsi_ops);
2414         vhost_scsi_deregister();
2415         destroy_workqueue(vhost_scsi_workqueue);
2416 };
2417
2418 MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
2419 MODULE_ALIAS("tcm_vhost");
2420 MODULE_LICENSE("GPL");
2421 module_init(vhost_scsi_init);
2422 module_exit(vhost_scsi_exit);