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 = configfs_depend_item(se_tpg->se_tpg_tfo->tf_subsys,
1413                                                    &se_tpg->tpg_group.cg_item);
1414                         if (ret) {
1415                                 pr_warn("configfs_depend_item() failed: %d\n", ret);
1416                                 kfree(vs_tpg);
1417                                 mutex_unlock(&tpg->tv_tpg_mutex);
1418                                 goto out;
1419                         }
1420                         tpg->tv_tpg_vhost_count++;
1421                         tpg->vhost_scsi = vs;
1422                         vs_tpg[tpg->tport_tpgt] = tpg;
1423                         smp_mb__after_atomic();
1424                         match = true;
1425                 }
1426                 mutex_unlock(&tpg->tv_tpg_mutex);
1427         }
1428
1429         if (match) {
1430                 memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
1431                        sizeof(vs->vs_vhost_wwpn));
1432                 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1433                         vq = &vs->vqs[i].vq;
1434                         mutex_lock(&vq->mutex);
1435                         vq->private_data = vs_tpg;
1436                         vhost_init_used(vq);
1437                         mutex_unlock(&vq->mutex);
1438                 }
1439                 ret = 0;
1440         } else {
1441                 ret = -EEXIST;
1442         }
1443
1444         /*
1445          * Act as synchronize_rcu to make sure access to
1446          * old vs->vs_tpg is finished.
1447          */
1448         vhost_scsi_flush(vs);
1449         kfree(vs->vs_tpg);
1450         vs->vs_tpg = vs_tpg;
1451
1452 out:
1453         mutex_unlock(&vs->dev.mutex);
1454         mutex_unlock(&vhost_scsi_mutex);
1455         return ret;
1456 }
1457
1458 static int
1459 vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
1460                           struct vhost_scsi_target *t)
1461 {
1462         struct se_portal_group *se_tpg;
1463         struct vhost_scsi_tport *tv_tport;
1464         struct vhost_scsi_tpg *tpg;
1465         struct vhost_virtqueue *vq;
1466         bool match = false;
1467         int index, ret, i;
1468         u8 target;
1469
1470         mutex_lock(&vhost_scsi_mutex);
1471         mutex_lock(&vs->dev.mutex);
1472         /* Verify that ring has been setup correctly. */
1473         for (index = 0; index < vs->dev.nvqs; ++index) {
1474                 if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1475                         ret = -EFAULT;
1476                         goto err_dev;
1477                 }
1478         }
1479
1480         if (!vs->vs_tpg) {
1481                 ret = 0;
1482                 goto err_dev;
1483         }
1484
1485         for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1486                 target = i;
1487                 tpg = vs->vs_tpg[target];
1488                 if (!tpg)
1489                         continue;
1490
1491                 mutex_lock(&tpg->tv_tpg_mutex);
1492                 tv_tport = tpg->tport;
1493                 if (!tv_tport) {
1494                         ret = -ENODEV;
1495                         goto err_tpg;
1496                 }
1497
1498                 if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1499                         pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
1500                                 " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
1501                                 tv_tport->tport_name, tpg->tport_tpgt,
1502                                 t->vhost_wwpn, t->vhost_tpgt);
1503                         ret = -EINVAL;
1504                         goto err_tpg;
1505                 }
1506                 tpg->tv_tpg_vhost_count--;
1507                 tpg->vhost_scsi = NULL;
1508                 vs->vs_tpg[target] = NULL;
1509                 match = true;
1510                 mutex_unlock(&tpg->tv_tpg_mutex);
1511                 /*
1512                  * Release se_tpg->tpg_group.cg_item configfs dependency now
1513                  * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur.
1514                  */
1515                 se_tpg = &tpg->se_tpg;
1516                 configfs_undepend_item(se_tpg->se_tpg_tfo->tf_subsys,
1517                                        &se_tpg->tpg_group.cg_item);
1518         }
1519         if (match) {
1520                 for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1521                         vq = &vs->vqs[i].vq;
1522                         mutex_lock(&vq->mutex);
1523                         vq->private_data = NULL;
1524                         mutex_unlock(&vq->mutex);
1525                 }
1526         }
1527         /*
1528          * Act as synchronize_rcu to make sure access to
1529          * old vs->vs_tpg is finished.
1530          */
1531         vhost_scsi_flush(vs);
1532         kfree(vs->vs_tpg);
1533         vs->vs_tpg = NULL;
1534         WARN_ON(vs->vs_events_nr);
1535         mutex_unlock(&vs->dev.mutex);
1536         mutex_unlock(&vhost_scsi_mutex);
1537         return 0;
1538
1539 err_tpg:
1540         mutex_unlock(&tpg->tv_tpg_mutex);
1541 err_dev:
1542         mutex_unlock(&vs->dev.mutex);
1543         mutex_unlock(&vhost_scsi_mutex);
1544         return ret;
1545 }
1546
1547 static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
1548 {
1549         struct vhost_virtqueue *vq;
1550         int i;
1551
1552         if (features & ~VHOST_SCSI_FEATURES)
1553                 return -EOPNOTSUPP;
1554
1555         mutex_lock(&vs->dev.mutex);
1556         if ((features & (1 << VHOST_F_LOG_ALL)) &&
1557             !vhost_log_access_ok(&vs->dev)) {
1558                 mutex_unlock(&vs->dev.mutex);
1559                 return -EFAULT;
1560         }
1561
1562         for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1563                 vq = &vs->vqs[i].vq;
1564                 mutex_lock(&vq->mutex);
1565                 vq->acked_features = features;
1566                 mutex_unlock(&vq->mutex);
1567         }
1568         mutex_unlock(&vs->dev.mutex);
1569         return 0;
1570 }
1571
1572 static int vhost_scsi_open(struct inode *inode, struct file *f)
1573 {
1574         struct vhost_scsi *vs;
1575         struct vhost_virtqueue **vqs;
1576         int r = -ENOMEM, i;
1577
1578         vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
1579         if (!vs) {
1580                 vs = vzalloc(sizeof(*vs));
1581                 if (!vs)
1582                         goto err_vs;
1583         }
1584
1585         vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL);
1586         if (!vqs)
1587                 goto err_vqs;
1588
1589         vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work);
1590         vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work);
1591
1592         vs->vs_events_nr = 0;
1593         vs->vs_events_missed = false;
1594
1595         vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;
1596         vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1597         vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
1598         vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
1599         for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
1600                 vqs[i] = &vs->vqs[i].vq;
1601                 vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
1602         }
1603         vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ);
1604
1605         vhost_scsi_init_inflight(vs, NULL);
1606
1607         f->private_data = vs;
1608         return 0;
1609
1610 err_vqs:
1611         kvfree(vs);
1612 err_vs:
1613         return r;
1614 }
1615
1616 static int vhost_scsi_release(struct inode *inode, struct file *f)
1617 {
1618         struct vhost_scsi *vs = f->private_data;
1619         struct vhost_scsi_target t;
1620
1621         mutex_lock(&vs->dev.mutex);
1622         memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
1623         mutex_unlock(&vs->dev.mutex);
1624         vhost_scsi_clear_endpoint(vs, &t);
1625         vhost_dev_stop(&vs->dev);
1626         vhost_dev_cleanup(&vs->dev, false);
1627         /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
1628         vhost_scsi_flush(vs);
1629         kfree(vs->dev.vqs);
1630         kvfree(vs);
1631         return 0;
1632 }
1633
1634 static long
1635 vhost_scsi_ioctl(struct file *f,
1636                  unsigned int ioctl,
1637                  unsigned long arg)
1638 {
1639         struct vhost_scsi *vs = f->private_data;
1640         struct vhost_scsi_target backend;
1641         void __user *argp = (void __user *)arg;
1642         u64 __user *featurep = argp;
1643         u32 __user *eventsp = argp;
1644         u32 events_missed;
1645         u64 features;
1646         int r, abi_version = VHOST_SCSI_ABI_VERSION;
1647         struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1648
1649         switch (ioctl) {
1650         case VHOST_SCSI_SET_ENDPOINT:
1651                 if (copy_from_user(&backend, argp, sizeof backend))
1652                         return -EFAULT;
1653                 if (backend.reserved != 0)
1654                         return -EOPNOTSUPP;
1655
1656                 return vhost_scsi_set_endpoint(vs, &backend);
1657         case VHOST_SCSI_CLEAR_ENDPOINT:
1658                 if (copy_from_user(&backend, argp, sizeof backend))
1659                         return -EFAULT;
1660                 if (backend.reserved != 0)
1661                         return -EOPNOTSUPP;
1662
1663                 return vhost_scsi_clear_endpoint(vs, &backend);
1664         case VHOST_SCSI_GET_ABI_VERSION:
1665                 if (copy_to_user(argp, &abi_version, sizeof abi_version))
1666                         return -EFAULT;
1667                 return 0;
1668         case VHOST_SCSI_SET_EVENTS_MISSED:
1669                 if (get_user(events_missed, eventsp))
1670                         return -EFAULT;
1671                 mutex_lock(&vq->mutex);
1672                 vs->vs_events_missed = events_missed;
1673                 mutex_unlock(&vq->mutex);
1674                 return 0;
1675         case VHOST_SCSI_GET_EVENTS_MISSED:
1676                 mutex_lock(&vq->mutex);
1677                 events_missed = vs->vs_events_missed;
1678                 mutex_unlock(&vq->mutex);
1679                 if (put_user(events_missed, eventsp))
1680                         return -EFAULT;
1681                 return 0;
1682         case VHOST_GET_FEATURES:
1683                 features = VHOST_SCSI_FEATURES;
1684                 if (copy_to_user(featurep, &features, sizeof features))
1685                         return -EFAULT;
1686                 return 0;
1687         case VHOST_SET_FEATURES:
1688                 if (copy_from_user(&features, featurep, sizeof features))
1689                         return -EFAULT;
1690                 return vhost_scsi_set_features(vs, features);
1691         default:
1692                 mutex_lock(&vs->dev.mutex);
1693                 r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
1694                 /* TODO: flush backend after dev ioctl. */
1695                 if (r == -ENOIOCTLCMD)
1696                         r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
1697                 mutex_unlock(&vs->dev.mutex);
1698                 return r;
1699         }
1700 }
1701
1702 #ifdef CONFIG_COMPAT
1703 static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl,
1704                                 unsigned long arg)
1705 {
1706         return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
1707 }
1708 #endif
1709
1710 static const struct file_operations vhost_scsi_fops = {
1711         .owner          = THIS_MODULE,
1712         .release        = vhost_scsi_release,
1713         .unlocked_ioctl = vhost_scsi_ioctl,
1714 #ifdef CONFIG_COMPAT
1715         .compat_ioctl   = vhost_scsi_compat_ioctl,
1716 #endif
1717         .open           = vhost_scsi_open,
1718         .llseek         = noop_llseek,
1719 };
1720
1721 static struct miscdevice vhost_scsi_misc = {
1722         MISC_DYNAMIC_MINOR,
1723         "vhost-scsi",
1724         &vhost_scsi_fops,
1725 };
1726
1727 static int __init vhost_scsi_register(void)
1728 {
1729         return misc_register(&vhost_scsi_misc);
1730 }
1731
1732 static int vhost_scsi_deregister(void)
1733 {
1734         return misc_deregister(&vhost_scsi_misc);
1735 }
1736
1737 static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport)
1738 {
1739         switch (tport->tport_proto_id) {
1740         case SCSI_PROTOCOL_SAS:
1741                 return "SAS";
1742         case SCSI_PROTOCOL_FCP:
1743                 return "FCP";
1744         case SCSI_PROTOCOL_ISCSI:
1745                 return "iSCSI";
1746         default:
1747                 break;
1748         }
1749
1750         return "Unknown";
1751 }
1752
1753 static void
1754 vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg,
1755                   struct se_lun *lun, bool plug)
1756 {
1757
1758         struct vhost_scsi *vs = tpg->vhost_scsi;
1759         struct vhost_virtqueue *vq;
1760         u32 reason;
1761
1762         if (!vs)
1763                 return;
1764
1765         mutex_lock(&vs->dev.mutex);
1766
1767         if (plug)
1768                 reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
1769         else
1770                 reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
1771
1772         vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1773         mutex_lock(&vq->mutex);
1774         if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG))
1775                 vhost_scsi_send_evt(vs, tpg, lun,
1776                                    VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
1777         mutex_unlock(&vq->mutex);
1778         mutex_unlock(&vs->dev.mutex);
1779 }
1780
1781 static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1782 {
1783         vhost_scsi_do_plug(tpg, lun, true);
1784 }
1785
1786 static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1787 {
1788         vhost_scsi_do_plug(tpg, lun, false);
1789 }
1790
1791 static int vhost_scsi_port_link(struct se_portal_group *se_tpg,
1792                                struct se_lun *lun)
1793 {
1794         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1795                                 struct vhost_scsi_tpg, se_tpg);
1796
1797         mutex_lock(&vhost_scsi_mutex);
1798
1799         mutex_lock(&tpg->tv_tpg_mutex);
1800         tpg->tv_tpg_port_count++;
1801         mutex_unlock(&tpg->tv_tpg_mutex);
1802
1803         vhost_scsi_hotplug(tpg, lun);
1804
1805         mutex_unlock(&vhost_scsi_mutex);
1806
1807         return 0;
1808 }
1809
1810 static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg,
1811                                   struct se_lun *lun)
1812 {
1813         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1814                                 struct vhost_scsi_tpg, se_tpg);
1815
1816         mutex_lock(&vhost_scsi_mutex);
1817
1818         mutex_lock(&tpg->tv_tpg_mutex);
1819         tpg->tv_tpg_port_count--;
1820         mutex_unlock(&tpg->tv_tpg_mutex);
1821
1822         vhost_scsi_hotunplug(tpg, lun);
1823
1824         mutex_unlock(&vhost_scsi_mutex);
1825 }
1826
1827 static struct se_node_acl *
1828 vhost_scsi_make_nodeacl(struct se_portal_group *se_tpg,
1829                        struct config_group *group,
1830                        const char *name)
1831 {
1832         struct se_node_acl *se_nacl, *se_nacl_new;
1833         struct vhost_scsi_nacl *nacl;
1834         u64 wwpn = 0;
1835         u32 nexus_depth;
1836
1837         /* vhost_scsi_parse_wwn(name, &wwpn, 1) < 0)
1838                 return ERR_PTR(-EINVAL); */
1839         se_nacl_new = vhost_scsi_alloc_fabric_acl(se_tpg);
1840         if (!se_nacl_new)
1841                 return ERR_PTR(-ENOMEM);
1842
1843         nexus_depth = 1;
1844         /*
1845          * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1846          * when converting a NodeACL from demo mode -> explict
1847          */
1848         se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1849                                 name, nexus_depth);
1850         if (IS_ERR(se_nacl)) {
1851                 vhost_scsi_release_fabric_acl(se_tpg, se_nacl_new);
1852                 return se_nacl;
1853         }
1854         /*
1855          * Locate our struct vhost_scsi_nacl and set the FC Nport WWPN
1856          */
1857         nacl = container_of(se_nacl, struct vhost_scsi_nacl, se_node_acl);
1858         nacl->iport_wwpn = wwpn;
1859
1860         return se_nacl;
1861 }
1862
1863 static void vhost_scsi_drop_nodeacl(struct se_node_acl *se_acl)
1864 {
1865         struct vhost_scsi_nacl *nacl = container_of(se_acl,
1866                                 struct vhost_scsi_nacl, se_node_acl);
1867         core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1868         kfree(nacl);
1869 }
1870
1871 static void vhost_scsi_free_cmd_map_res(struct vhost_scsi_nexus *nexus,
1872                                        struct se_session *se_sess)
1873 {
1874         struct vhost_scsi_cmd *tv_cmd;
1875         unsigned int i;
1876
1877         if (!se_sess->sess_cmd_map)
1878                 return;
1879
1880         for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1881                 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1882
1883                 kfree(tv_cmd->tvc_sgl);
1884                 kfree(tv_cmd->tvc_prot_sgl);
1885                 kfree(tv_cmd->tvc_upages);
1886         }
1887 }
1888
1889 static ssize_t vhost_scsi_tpg_attrib_store_fabric_prot_type(
1890         struct se_portal_group *se_tpg,
1891         const char *page,
1892         size_t count)
1893 {
1894         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1895                                 struct vhost_scsi_tpg, se_tpg);
1896         unsigned long val;
1897         int ret = kstrtoul(page, 0, &val);
1898
1899         if (ret) {
1900                 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
1901                 return ret;
1902         }
1903         if (val != 0 && val != 1 && val != 3) {
1904                 pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val);
1905                 return -EINVAL;
1906         }
1907         tpg->tv_fabric_prot_type = val;
1908
1909         return count;
1910 }
1911
1912 static ssize_t vhost_scsi_tpg_attrib_show_fabric_prot_type(
1913         struct se_portal_group *se_tpg,
1914         char *page)
1915 {
1916         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1917                                 struct vhost_scsi_tpg, se_tpg);
1918
1919         return sprintf(page, "%d\n", tpg->tv_fabric_prot_type);
1920 }
1921 TF_TPG_ATTRIB_ATTR(vhost_scsi, fabric_prot_type, S_IRUGO | S_IWUSR);
1922
1923 static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = {
1924         &vhost_scsi_tpg_attrib_fabric_prot_type.attr,
1925         NULL,
1926 };
1927
1928 static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
1929                                 const char *name)
1930 {
1931         struct se_portal_group *se_tpg;
1932         struct se_session *se_sess;
1933         struct vhost_scsi_nexus *tv_nexus;
1934         struct vhost_scsi_cmd *tv_cmd;
1935         unsigned int i;
1936
1937         mutex_lock(&tpg->tv_tpg_mutex);
1938         if (tpg->tpg_nexus) {
1939                 mutex_unlock(&tpg->tv_tpg_mutex);
1940                 pr_debug("tpg->tpg_nexus already exists\n");
1941                 return -EEXIST;
1942         }
1943         se_tpg = &tpg->se_tpg;
1944
1945         tv_nexus = kzalloc(sizeof(struct vhost_scsi_nexus), GFP_KERNEL);
1946         if (!tv_nexus) {
1947                 mutex_unlock(&tpg->tv_tpg_mutex);
1948                 pr_err("Unable to allocate struct vhost_scsi_nexus\n");
1949                 return -ENOMEM;
1950         }
1951         /*
1952          *  Initialize the struct se_session pointer and setup tagpool
1953          *  for struct vhost_scsi_cmd descriptors
1954          */
1955         tv_nexus->tvn_se_sess = transport_init_session_tags(
1956                                         VHOST_SCSI_DEFAULT_TAGS,
1957                                         sizeof(struct vhost_scsi_cmd),
1958                                         TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS);
1959         if (IS_ERR(tv_nexus->tvn_se_sess)) {
1960                 mutex_unlock(&tpg->tv_tpg_mutex);
1961                 kfree(tv_nexus);
1962                 return -ENOMEM;
1963         }
1964         se_sess = tv_nexus->tvn_se_sess;
1965         for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1966                 tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1967
1968                 tv_cmd->tvc_sgl = kzalloc(sizeof(struct scatterlist) *
1969                                         VHOST_SCSI_PREALLOC_SGLS, GFP_KERNEL);
1970                 if (!tv_cmd->tvc_sgl) {
1971                         mutex_unlock(&tpg->tv_tpg_mutex);
1972                         pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
1973                         goto out;
1974                 }
1975
1976                 tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) *
1977                                         VHOST_SCSI_PREALLOC_UPAGES, GFP_KERNEL);
1978                 if (!tv_cmd->tvc_upages) {
1979                         mutex_unlock(&tpg->tv_tpg_mutex);
1980                         pr_err("Unable to allocate tv_cmd->tvc_upages\n");
1981                         goto out;
1982                 }
1983
1984                 tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) *
1985                                         VHOST_SCSI_PREALLOC_PROT_SGLS, GFP_KERNEL);
1986                 if (!tv_cmd->tvc_prot_sgl) {
1987                         mutex_unlock(&tpg->tv_tpg_mutex);
1988                         pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
1989                         goto out;
1990                 }
1991         }
1992         /*
1993          * Since we are running in 'demo mode' this call with generate a
1994          * struct se_node_acl for the vhost_scsi struct se_portal_group with
1995          * the SCSI Initiator port name of the passed configfs group 'name'.
1996          */
1997         tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1998                                 se_tpg, (unsigned char *)name);
1999         if (!tv_nexus->tvn_se_sess->se_node_acl) {
2000                 mutex_unlock(&tpg->tv_tpg_mutex);
2001                 pr_debug("core_tpg_check_initiator_node_acl() failed"
2002                                 " for %s\n", name);
2003                 goto out;
2004         }
2005         /*
2006          * Now register the TCM vhost virtual I_T Nexus as active.
2007          */
2008         transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
2009                         tv_nexus->tvn_se_sess, tv_nexus);
2010         tpg->tpg_nexus = tv_nexus;
2011
2012         mutex_unlock(&tpg->tv_tpg_mutex);
2013         return 0;
2014
2015 out:
2016         vhost_scsi_free_cmd_map_res(tv_nexus, se_sess);
2017         transport_free_session(se_sess);
2018         kfree(tv_nexus);
2019         return -ENOMEM;
2020 }
2021
2022 static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg)
2023 {
2024         struct se_session *se_sess;
2025         struct vhost_scsi_nexus *tv_nexus;
2026
2027         mutex_lock(&tpg->tv_tpg_mutex);
2028         tv_nexus = tpg->tpg_nexus;
2029         if (!tv_nexus) {
2030                 mutex_unlock(&tpg->tv_tpg_mutex);
2031                 return -ENODEV;
2032         }
2033
2034         se_sess = tv_nexus->tvn_se_sess;
2035         if (!se_sess) {
2036                 mutex_unlock(&tpg->tv_tpg_mutex);
2037                 return -ENODEV;
2038         }
2039
2040         if (tpg->tv_tpg_port_count != 0) {
2041                 mutex_unlock(&tpg->tv_tpg_mutex);
2042                 pr_err("Unable to remove TCM_vhost I_T Nexus with"
2043                         " active TPG port count: %d\n",
2044                         tpg->tv_tpg_port_count);
2045                 return -EBUSY;
2046         }
2047
2048         if (tpg->tv_tpg_vhost_count != 0) {
2049                 mutex_unlock(&tpg->tv_tpg_mutex);
2050                 pr_err("Unable to remove TCM_vhost I_T Nexus with"
2051                         " active TPG vhost count: %d\n",
2052                         tpg->tv_tpg_vhost_count);
2053                 return -EBUSY;
2054         }
2055
2056         pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
2057                 " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport),
2058                 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
2059
2060         vhost_scsi_free_cmd_map_res(tv_nexus, se_sess);
2061         /*
2062          * Release the SCSI I_T Nexus to the emulated vhost Target Port
2063          */
2064         transport_deregister_session(tv_nexus->tvn_se_sess);
2065         tpg->tpg_nexus = NULL;
2066         mutex_unlock(&tpg->tv_tpg_mutex);
2067
2068         kfree(tv_nexus);
2069         return 0;
2070 }
2071
2072 static ssize_t vhost_scsi_tpg_show_nexus(struct se_portal_group *se_tpg,
2073                                         char *page)
2074 {
2075         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2076                                 struct vhost_scsi_tpg, se_tpg);
2077         struct vhost_scsi_nexus *tv_nexus;
2078         ssize_t ret;
2079
2080         mutex_lock(&tpg->tv_tpg_mutex);
2081         tv_nexus = tpg->tpg_nexus;
2082         if (!tv_nexus) {
2083                 mutex_unlock(&tpg->tv_tpg_mutex);
2084                 return -ENODEV;
2085         }
2086         ret = snprintf(page, PAGE_SIZE, "%s\n",
2087                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
2088         mutex_unlock(&tpg->tv_tpg_mutex);
2089
2090         return ret;
2091 }
2092
2093 static ssize_t vhost_scsi_tpg_store_nexus(struct se_portal_group *se_tpg,
2094                                          const char *page,
2095                                          size_t count)
2096 {
2097         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2098                                 struct vhost_scsi_tpg, se_tpg);
2099         struct vhost_scsi_tport *tport_wwn = tpg->tport;
2100         unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr;
2101         int ret;
2102         /*
2103          * Shutdown the active I_T nexus if 'NULL' is passed..
2104          */
2105         if (!strncmp(page, "NULL", 4)) {
2106                 ret = vhost_scsi_drop_nexus(tpg);
2107                 return (!ret) ? count : ret;
2108         }
2109         /*
2110          * Otherwise make sure the passed virtual Initiator port WWN matches
2111          * the fabric protocol_id set in vhost_scsi_make_tport(), and call
2112          * vhost_scsi_make_nexus().
2113          */
2114         if (strlen(page) >= VHOST_SCSI_NAMELEN) {
2115                 pr_err("Emulated NAA Sas Address: %s, exceeds"
2116                                 " max: %d\n", page, VHOST_SCSI_NAMELEN);
2117                 return -EINVAL;
2118         }
2119         snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page);
2120
2121         ptr = strstr(i_port, "naa.");
2122         if (ptr) {
2123                 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
2124                         pr_err("Passed SAS Initiator Port %s does not"
2125                                 " match target port protoid: %s\n", i_port,
2126                                 vhost_scsi_dump_proto_id(tport_wwn));
2127                         return -EINVAL;
2128                 }
2129                 port_ptr = &i_port[0];
2130                 goto check_newline;
2131         }
2132         ptr = strstr(i_port, "fc.");
2133         if (ptr) {
2134                 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
2135                         pr_err("Passed FCP Initiator Port %s does not"
2136                                 " match target port protoid: %s\n", i_port,
2137                                 vhost_scsi_dump_proto_id(tport_wwn));
2138                         return -EINVAL;
2139                 }
2140                 port_ptr = &i_port[3]; /* Skip over "fc." */
2141                 goto check_newline;
2142         }
2143         ptr = strstr(i_port, "iqn.");
2144         if (ptr) {
2145                 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
2146                         pr_err("Passed iSCSI Initiator Port %s does not"
2147                                 " match target port protoid: %s\n", i_port,
2148                                 vhost_scsi_dump_proto_id(tport_wwn));
2149                         return -EINVAL;
2150                 }
2151                 port_ptr = &i_port[0];
2152                 goto check_newline;
2153         }
2154         pr_err("Unable to locate prefix for emulated Initiator Port:"
2155                         " %s\n", i_port);
2156         return -EINVAL;
2157         /*
2158          * Clear any trailing newline for the NAA WWN
2159          */
2160 check_newline:
2161         if (i_port[strlen(i_port)-1] == '\n')
2162                 i_port[strlen(i_port)-1] = '\0';
2163
2164         ret = vhost_scsi_make_nexus(tpg, port_ptr);
2165         if (ret < 0)
2166                 return ret;
2167
2168         return count;
2169 }
2170
2171 TF_TPG_BASE_ATTR(vhost_scsi, nexus, S_IRUGO | S_IWUSR);
2172
2173 static struct configfs_attribute *vhost_scsi_tpg_attrs[] = {
2174         &vhost_scsi_tpg_nexus.attr,
2175         NULL,
2176 };
2177
2178 static struct se_portal_group *
2179 vhost_scsi_make_tpg(struct se_wwn *wwn,
2180                    struct config_group *group,
2181                    const char *name)
2182 {
2183         struct vhost_scsi_tport *tport = container_of(wwn,
2184                         struct vhost_scsi_tport, tport_wwn);
2185
2186         struct vhost_scsi_tpg *tpg;
2187         u16 tpgt;
2188         int ret;
2189
2190         if (strstr(name, "tpgt_") != name)
2191                 return ERR_PTR(-EINVAL);
2192         if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET)
2193                 return ERR_PTR(-EINVAL);
2194
2195         tpg = kzalloc(sizeof(struct vhost_scsi_tpg), GFP_KERNEL);
2196         if (!tpg) {
2197                 pr_err("Unable to allocate struct vhost_scsi_tpg");
2198                 return ERR_PTR(-ENOMEM);
2199         }
2200         mutex_init(&tpg->tv_tpg_mutex);
2201         INIT_LIST_HEAD(&tpg->tv_tpg_list);
2202         tpg->tport = tport;
2203         tpg->tport_tpgt = tpgt;
2204
2205         ret = core_tpg_register(&vhost_scsi_ops, wwn,
2206                                 &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
2207         if (ret < 0) {
2208                 kfree(tpg);
2209                 return NULL;
2210         }
2211         mutex_lock(&vhost_scsi_mutex);
2212         list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list);
2213         mutex_unlock(&vhost_scsi_mutex);
2214
2215         return &tpg->se_tpg;
2216 }
2217
2218 static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg)
2219 {
2220         struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2221                                 struct vhost_scsi_tpg, se_tpg);
2222
2223         mutex_lock(&vhost_scsi_mutex);
2224         list_del(&tpg->tv_tpg_list);
2225         mutex_unlock(&vhost_scsi_mutex);
2226         /*
2227          * Release the virtual I_T Nexus for this vhost TPG
2228          */
2229         vhost_scsi_drop_nexus(tpg);
2230         /*
2231          * Deregister the se_tpg from TCM..
2232          */
2233         core_tpg_deregister(se_tpg);
2234         kfree(tpg);
2235 }
2236
2237 static struct se_wwn *
2238 vhost_scsi_make_tport(struct target_fabric_configfs *tf,
2239                      struct config_group *group,
2240                      const char *name)
2241 {
2242         struct vhost_scsi_tport *tport;
2243         char *ptr;
2244         u64 wwpn = 0;
2245         int off = 0;
2246
2247         /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0)
2248                 return ERR_PTR(-EINVAL); */
2249
2250         tport = kzalloc(sizeof(struct vhost_scsi_tport), GFP_KERNEL);
2251         if (!tport) {
2252                 pr_err("Unable to allocate struct vhost_scsi_tport");
2253                 return ERR_PTR(-ENOMEM);
2254         }
2255         tport->tport_wwpn = wwpn;
2256         /*
2257          * Determine the emulated Protocol Identifier and Target Port Name
2258          * based on the incoming configfs directory name.
2259          */
2260         ptr = strstr(name, "naa.");
2261         if (ptr) {
2262                 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
2263                 goto check_len;
2264         }
2265         ptr = strstr(name, "fc.");
2266         if (ptr) {
2267                 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
2268                 off = 3; /* Skip over "fc." */
2269                 goto check_len;
2270         }
2271         ptr = strstr(name, "iqn.");
2272         if (ptr) {
2273                 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
2274                 goto check_len;
2275         }
2276
2277         pr_err("Unable to locate prefix for emulated Target Port:"
2278                         " %s\n", name);
2279         kfree(tport);
2280         return ERR_PTR(-EINVAL);
2281
2282 check_len:
2283         if (strlen(name) >= VHOST_SCSI_NAMELEN) {
2284                 pr_err("Emulated %s Address: %s, exceeds"
2285                         " max: %d\n", name, vhost_scsi_dump_proto_id(tport),
2286                         VHOST_SCSI_NAMELEN);
2287                 kfree(tport);
2288                 return ERR_PTR(-EINVAL);
2289         }
2290         snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]);
2291
2292         pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
2293                 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name);
2294
2295         return &tport->tport_wwn;
2296 }
2297
2298 static void vhost_scsi_drop_tport(struct se_wwn *wwn)
2299 {
2300         struct vhost_scsi_tport *tport = container_of(wwn,
2301                                 struct vhost_scsi_tport, tport_wwn);
2302
2303         pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
2304                 " %s Address: %s\n", vhost_scsi_dump_proto_id(tport),
2305                 tport->tport_name);
2306
2307         kfree(tport);
2308 }
2309
2310 static ssize_t
2311 vhost_scsi_wwn_show_attr_version(struct target_fabric_configfs *tf,
2312                                 char *page)
2313 {
2314         return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
2315                 "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2316                 utsname()->machine);
2317 }
2318
2319 TF_WWN_ATTR_RO(vhost_scsi, version);
2320
2321 static struct configfs_attribute *vhost_scsi_wwn_attrs[] = {
2322         &vhost_scsi_wwn_version.attr,
2323         NULL,
2324 };
2325
2326 static struct target_core_fabric_ops vhost_scsi_ops = {
2327         .module                         = THIS_MODULE,
2328         .name                           = "vhost",
2329         .get_fabric_name                = vhost_scsi_get_fabric_name,
2330         .get_fabric_proto_ident         = vhost_scsi_get_fabric_proto_ident,
2331         .tpg_get_wwn                    = vhost_scsi_get_fabric_wwn,
2332         .tpg_get_tag                    = vhost_scsi_get_tpgt,
2333         .tpg_get_default_depth          = vhost_scsi_get_default_depth,
2334         .tpg_get_pr_transport_id        = vhost_scsi_get_pr_transport_id,
2335         .tpg_get_pr_transport_id_len    = vhost_scsi_get_pr_transport_id_len,
2336         .tpg_parse_pr_out_transport_id  = vhost_scsi_parse_pr_out_transport_id,
2337         .tpg_check_demo_mode            = vhost_scsi_check_true,
2338         .tpg_check_demo_mode_cache      = vhost_scsi_check_true,
2339         .tpg_check_demo_mode_write_protect = vhost_scsi_check_false,
2340         .tpg_check_prod_mode_write_protect = vhost_scsi_check_false,
2341         .tpg_check_prot_fabric_only     = vhost_scsi_check_prot_fabric_only,
2342         .tpg_alloc_fabric_acl           = vhost_scsi_alloc_fabric_acl,
2343         .tpg_release_fabric_acl         = vhost_scsi_release_fabric_acl,
2344         .tpg_get_inst_index             = vhost_scsi_tpg_get_inst_index,
2345         .release_cmd                    = vhost_scsi_release_cmd,
2346         .check_stop_free                = vhost_scsi_check_stop_free,
2347         .shutdown_session               = vhost_scsi_shutdown_session,
2348         .close_session                  = vhost_scsi_close_session,
2349         .sess_get_index                 = vhost_scsi_sess_get_index,
2350         .sess_get_initiator_sid         = NULL,
2351         .write_pending                  = vhost_scsi_write_pending,
2352         .write_pending_status           = vhost_scsi_write_pending_status,
2353         .set_default_node_attributes    = vhost_scsi_set_default_node_attrs,
2354         .get_task_tag                   = vhost_scsi_get_task_tag,
2355         .get_cmd_state                  = vhost_scsi_get_cmd_state,
2356         .queue_data_in                  = vhost_scsi_queue_data_in,
2357         .queue_status                   = vhost_scsi_queue_status,
2358         .queue_tm_rsp                   = vhost_scsi_queue_tm_rsp,
2359         .aborted_task                   = vhost_scsi_aborted_task,
2360         /*
2361          * Setup callers for generic logic in target_core_fabric_configfs.c
2362          */
2363         .fabric_make_wwn                = vhost_scsi_make_tport,
2364         .fabric_drop_wwn                = vhost_scsi_drop_tport,
2365         .fabric_make_tpg                = vhost_scsi_make_tpg,
2366         .fabric_drop_tpg                = vhost_scsi_drop_tpg,
2367         .fabric_post_link               = vhost_scsi_port_link,
2368         .fabric_pre_unlink              = vhost_scsi_port_unlink,
2369         .fabric_make_np                 = NULL,
2370         .fabric_drop_np                 = NULL,
2371         .fabric_make_nodeacl            = vhost_scsi_make_nodeacl,
2372         .fabric_drop_nodeacl            = vhost_scsi_drop_nodeacl,
2373
2374         .tfc_wwn_attrs                  = vhost_scsi_wwn_attrs,
2375         .tfc_tpg_base_attrs             = vhost_scsi_tpg_attrs,
2376         .tfc_tpg_attrib_attrs           = vhost_scsi_tpg_attrib_attrs,
2377 };
2378
2379 static int __init vhost_scsi_init(void)
2380 {
2381         int ret = -ENOMEM;
2382
2383         pr_debug("TCM_VHOST fabric module %s on %s/%s"
2384                 " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2385                 utsname()->machine);
2386
2387         /*
2388          * Use our own dedicated workqueue for submitting I/O into
2389          * target core to avoid contention within system_wq.
2390          */
2391         vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0);
2392         if (!vhost_scsi_workqueue)
2393                 goto out;
2394
2395         ret = vhost_scsi_register();
2396         if (ret < 0)
2397                 goto out_destroy_workqueue;
2398
2399         ret = target_register_template(&vhost_scsi_ops);
2400         if (ret < 0)
2401                 goto out_vhost_scsi_deregister;
2402
2403         return 0;
2404
2405 out_vhost_scsi_deregister:
2406         vhost_scsi_deregister();
2407 out_destroy_workqueue:
2408         destroy_workqueue(vhost_scsi_workqueue);
2409 out:
2410         return ret;
2411 };
2412
2413 static void vhost_scsi_exit(void)
2414 {
2415         target_unregister_template(&vhost_scsi_ops);
2416         vhost_scsi_deregister();
2417         destroy_workqueue(vhost_scsi_workqueue);
2418 };
2419
2420 MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
2421 MODULE_ALIAS("tcm_vhost");
2422 MODULE_LICENSE("GPL");
2423 module_init(vhost_scsi_init);
2424 module_exit(vhost_scsi_exit);