drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3  * IBM Virtual SCSI Target Driver
   4  * Copyright (C) 2003-2005 Dave Boutcher (boutcher@us.ibm.com) IBM Corp.
   5  *                         Santiago Leon (santil@us.ibm.com) IBM Corp.
   6  *                         Linda Xie (lxie@us.ibm.com) IBM Corp.
   7  *
   8  * Copyright (C) 2005-2011 FUJITA Tomonori <tomof@acm.org>
   9  * Copyright (C) 2010 Nicholas A. Bellinger <nab@kernel.org>
  10  *
  11  * Authors: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
  12  * Authors: Michael Cyr <mikecyr@linux.vnet.ibm.com>
  13  *
  14  ****************************************************************************/
  15
  16 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  17
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/slab.h>
  21 #include <linux/types.h>
  22 #include <linux/list.h>
  23 #include <linux/string.h>
  24 #include <linux/delay.h>
  25
  26 #include <target/target_core_base.h>
  27 #include <target/target_core_fabric.h>
  28
  29 #include <asm/hvcall.h>
  30 #include <asm/vio.h>
  31
  32 #include <scsi/viosrp.h>
  33
  34 #include "ibmvscsi_tgt.h"
  35
  36 #define IBMVSCSIS_VERSION       "v0.2"
  37
  38 #define INITIAL_SRP_LIMIT       800
  39 #define DEFAULT_MAX_SECTORS     256
  40 #define MAX_TXU                 1024 * 1024
  41
  42 static uint max_vdma_size = MAX_H_COPY_RDMA;
  43
  44 static char system_id[SYS_ID_NAME_LEN] = "";
  45 static char partition_name[PARTITION_NAMELEN] = "UNKNOWN";
  46 static uint partition_number = -1;
  47
  48 /* Adapter list and lock to control it */
  49 static DEFINE_SPINLOCK(ibmvscsis_dev_lock);
  50 static LIST_HEAD(ibmvscsis_dev_list);
  51
  52 static long ibmvscsis_parse_command(struct scsi_info *vscsi,
  53                                     struct viosrp_crq *crq);
  54
  55 static void ibmvscsis_adapter_idle(struct scsi_info *vscsi);
  56
  57 static void ibmvscsis_determine_resid(struct se_cmd *se_cmd,
  58                                       struct srp_rsp *rsp)
  59 {
  60         u32 residual_count = se_cmd->residual_count;
  61
  62         if (!residual_count)
  63                 return;
  64
  65         if (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
  66                 if (se_cmd->data_direction == DMA_TO_DEVICE) {
  67                         /* residual data from an underflow write */
  68                         rsp->flags = SRP_RSP_FLAG_DOUNDER;
  69                         rsp->data_out_res_cnt = cpu_to_be32(residual_count);
  70                 } else if (se_cmd->data_direction == DMA_FROM_DEVICE) {
  71                         /* residual data from an underflow read */
  72                         rsp->flags = SRP_RSP_FLAG_DIUNDER;
  73                         rsp->data_in_res_cnt = cpu_to_be32(residual_count);
  74                 }
  75         } else if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
  76                 if (se_cmd->data_direction == DMA_TO_DEVICE) {
  77                         /* residual data from an overflow write */
  78                         rsp->flags = SRP_RSP_FLAG_DOOVER;
  79                         rsp->data_out_res_cnt = cpu_to_be32(residual_count);
  80                 } else if (se_cmd->data_direction == DMA_FROM_DEVICE) {
  81                         /* residual data from an overflow read */
  82                         rsp->flags = SRP_RSP_FLAG_DIOVER;
  83                         rsp->data_in_res_cnt = cpu_to_be32(residual_count);
  84                 }
  85         }
  86 }
  87
  88 /**
  89  * connection_broken() - Determine if the connection to the client is good
  90  * @vscsi:      Pointer to our adapter structure
  91  *
  92  * This function attempts to send a ping MAD to the client. If the call to
  93  * queue the request returns H_CLOSED then the connection has been broken
  94  * and the function returns TRUE.
  95  *
  96  * EXECUTION ENVIRONMENT:
  97  *      Interrupt or Process environment
  98  */
  99 static bool connection_broken(struct scsi_info *vscsi)
 100 {
 101         struct viosrp_crq *crq;
 102         u64 buffer[2] = { 0, 0 };
 103         long h_return_code;
 104         bool rc = false;
 105
 106         /* create a PING crq */
 107         crq = (struct viosrp_crq *)&buffer;
 108         crq->valid = VALID_CMD_RESP_EL;
 109         crq->format = MESSAGE_IN_CRQ;
 110         crq->status = PING;
 111
 112         h_return_code = h_send_crq(vscsi->dds.unit_id,
 113                                    cpu_to_be64(buffer[MSG_HI]),
 114                                    cpu_to_be64(buffer[MSG_LOW]));
 115
 116         dev_dbg(&vscsi->dev, "Connection_broken: rc %ld\n", h_return_code);
 117
 118         if (h_return_code == H_CLOSED)
 119                 rc = true;
 120
 121         return rc;
 122 }
 123
 124 /**
 125  * ibmvscsis_unregister_command_q() - Helper Function-Unregister Command Queue
 126  * @vscsi:      Pointer to our adapter structure
 127  *
 128  * This function calls h_free_q then frees the interrupt bit etc.
 129  * It must release the lock before doing so because of the time it can take
 130  * for h_free_crq in PHYP
 131  * NOTE: the caller must make sure that state and or flags will prevent
 132  *       interrupt handler from scheduling work.
 133  * NOTE: anyone calling this function may need to set the CRQ_CLOSED flag
 134  *       we can't do it here, because we don't have the lock
 135  *
 136  * EXECUTION ENVIRONMENT:
 137  *      Process level
 138  */
 139 static long ibmvscsis_unregister_command_q(struct scsi_info *vscsi)
 140 {
 141         long qrc;
 142         long rc = ADAPT_SUCCESS;
 143         int ticks = 0;
 144
 145         do {
 146                 qrc = h_free_crq(vscsi->dds.unit_id);
 147                 switch (qrc) {
 148                 case H_SUCCESS:
 149                         spin_lock_bh(&vscsi->intr_lock);
 150                         vscsi->flags &= ~PREP_FOR_SUSPEND_FLAGS;
 151                         spin_unlock_bh(&vscsi->intr_lock);
 152                         break;
 153
 154                 case H_HARDWARE:
 155                 case H_PARAMETER:
 156                         dev_err(&vscsi->dev, "unregister_command_q: error from h_free_crq %ld\n",
 157                                 qrc);
 158                         rc = ERROR;
 159                         break;
 160
 161                 case H_BUSY:
 162                 case H_LONG_BUSY_ORDER_1_MSEC:
 163                         /* msleep not good for small values */
 164                         usleep_range(1000, 2000);
 165                         ticks += 1;
 166                         break;
 167                 case H_LONG_BUSY_ORDER_10_MSEC:
 168                         usleep_range(10000, 20000);
 169                         ticks += 10;
 170                         break;
 171                 case H_LONG_BUSY_ORDER_100_MSEC:
 172                         msleep(100);
 173                         ticks += 100;
 174                         break;
 175                 case H_LONG_BUSY_ORDER_1_SEC:
 176                         ssleep(1);
 177                         ticks += 1000;
 178                         break;
 179                 case H_LONG_BUSY_ORDER_10_SEC:
 180                         ssleep(10);
 181                         ticks += 10000;
 182                         break;
 183                 case H_LONG_BUSY_ORDER_100_SEC:
 184                         ssleep(100);
 185                         ticks += 100000;
 186                         break;
 187                 default:
 188                         dev_err(&vscsi->dev, "unregister_command_q: unknown error %ld from h_free_crq\n",
 189                                 qrc);
 190                         rc = ERROR;
 191                         break;
 192                 }
 193
 194                 /*
 195                  * dont wait more then 300 seconds
 196                  * ticks are in milliseconds more or less
 197                  */
 198                 if (ticks > 300000 && qrc != H_SUCCESS) {
 199                         rc = ERROR;
 200                         dev_err(&vscsi->dev, "Excessive wait for h_free_crq\n");
 201                 }
 202         } while (qrc != H_SUCCESS && rc == ADAPT_SUCCESS);
 203
 204         dev_dbg(&vscsi->dev, "Freeing CRQ: phyp rc %ld, rc %ld\n", qrc, rc);
 205
 206         return rc;
 207 }
 208
 209 /**
 210  * ibmvscsis_delete_client_info() - Helper function to Delete Client Info
 211  * @vscsi:      Pointer to our adapter structure
 212  * @client_closed:      True if client closed its queue
 213  *
 214  * Deletes information specific to the client when the client goes away
 215  *
 216  * EXECUTION ENVIRONMENT:
 217  *      Interrupt or Process
 218  */
 219 static void ibmvscsis_delete_client_info(struct scsi_info *vscsi,
 220                                          bool client_closed)
 221 {
 222         vscsi->client_cap = 0;
 223
 224         /*
 225          * Some things we don't want to clear if we're closing the queue,
 226          * because some clients don't resend the host handshake when they
 227          * get a transport event.
 228          */
 229         if (client_closed)
 230                 vscsi->client_data.os_type = 0;
 231 }
 232
 233 /**
 234  * ibmvscsis_free_command_q() - Free Command Queue
 235  * @vscsi:      Pointer to our adapter structure
 236  *
 237  * This function calls unregister_command_q, then clears interrupts and
 238  * any pending interrupt acknowledgments associated with the command q.
 239  * It also clears memory if there is no error.
 240  *
 241  * PHYP did not meet the PAPR architecture so that we must give up the
 242  * lock. This causes a timing hole regarding state change.  To close the
 243  * hole this routine does accounting on any change that occurred during
 244  * the time the lock is not held.
 245  * NOTE: must give up and then acquire the interrupt lock, the caller must
 246  *       make sure that state and or flags will prevent interrupt handler from
 247  *       scheduling work.
 248  *
 249  * EXECUTION ENVIRONMENT:
 250  *      Process level, interrupt lock is held
 251  */
 252 static long ibmvscsis_free_command_q(struct scsi_info *vscsi)
 253 {
 254         int bytes;
 255         u32 flags_under_lock;
 256         u16 state_under_lock;
 257         long rc = ADAPT_SUCCESS;
 258
 259         if (!(vscsi->flags & CRQ_CLOSED)) {
 260                 vio_disable_interrupts(vscsi->dma_dev);
 261
 262                 state_under_lock = vscsi->new_state;
 263                 flags_under_lock = vscsi->flags;
 264                 vscsi->phyp_acr_state = 0;
 265                 vscsi->phyp_acr_flags = 0;
 266
 267                 spin_unlock_bh(&vscsi->intr_lock);
 268                 rc = ibmvscsis_unregister_command_q(vscsi);
 269                 spin_lock_bh(&vscsi->intr_lock);
 270
 271                 if (state_under_lock != vscsi->new_state)
 272                         vscsi->phyp_acr_state = vscsi->new_state;
 273
 274                 vscsi->phyp_acr_flags = ((~flags_under_lock) & vscsi->flags);
 275
 276                 if (rc == ADAPT_SUCCESS) {
 277                         bytes = vscsi->cmd_q.size * PAGE_SIZE;
 278                         memset(vscsi->cmd_q.base_addr, 0, bytes);
 279                         vscsi->cmd_q.index = 0;
 280                         vscsi->flags |= CRQ_CLOSED;
 281
 282                         ibmvscsis_delete_client_info(vscsi, false);
 283                 }
 284
 285                 dev_dbg(&vscsi->dev, "free_command_q: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n",
 286                         vscsi->flags, vscsi->state, vscsi->phyp_acr_flags,
 287                         vscsi->phyp_acr_state);
 288         }
 289         return rc;
 290 }
 291
 292 /**
 293  * ibmvscsis_cmd_q_dequeue() - Get valid Command element
 294  * @mask:       Mask to use in case index wraps
 295  * @current_index:      Current index into command queue
 296  * @base_addr:  Pointer to start of command queue
 297  *
 298  * Returns a pointer to a valid command element or NULL, if the command
 299  * queue is empty
 300  *
 301  * EXECUTION ENVIRONMENT:
 302  *      Interrupt environment, interrupt lock held
 303  */
 304 static struct viosrp_crq *ibmvscsis_cmd_q_dequeue(uint mask,
 305                                                   uint *current_index,
 306                                                   struct viosrp_crq *base_addr)
 307 {
 308         struct viosrp_crq *ptr;
 309
 310         ptr = base_addr + *current_index;
 311
 312         if (ptr->valid) {
 313                 *current_index = (*current_index + 1) & mask;
 314                 dma_rmb();
 315         } else {
 316                 ptr = NULL;
 317         }
 318
 319         return ptr;
 320 }
 321
 322 /**
 323  * ibmvscsis_send_init_message() - send initialize message to the client
 324  * @vscsi:      Pointer to our adapter structure
 325  * @format:     Which Init Message format to send
 326  *
 327  * EXECUTION ENVIRONMENT:
 328  *      Interrupt environment interrupt lock held
 329  */
 330 static long ibmvscsis_send_init_message(struct scsi_info *vscsi, u8 format)
 331 {
 332         struct viosrp_crq *crq;
 333         u64 buffer[2] = { 0, 0 };
 334         long rc;
 335
 336         crq = (struct viosrp_crq *)&buffer;
 337         crq->valid = VALID_INIT_MSG;
 338         crq->format = format;
 339         rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]),
 340                         cpu_to_be64(buffer[MSG_LOW]));
 341
 342         return rc;
 343 }
 344
 345 /**
 346  * ibmvscsis_check_init_msg() - Check init message valid
 347  * @vscsi:      Pointer to our adapter structure
 348  * @format:     Pointer to return format of Init Message, if any.
 349  *              Set to UNUSED_FORMAT if no Init Message in queue.
 350  *
 351  * Checks if an initialize message was queued by the initiatior
 352  * after the queue was created and before the interrupt was enabled.
 353  *
 354  * EXECUTION ENVIRONMENT:
 355  *      Process level only, interrupt lock held
 356  */
 357 static long ibmvscsis_check_init_msg(struct scsi_info *vscsi, uint *format)
 358 {
 359         struct viosrp_crq *crq;
 360         long rc = ADAPT_SUCCESS;
 361
 362         crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask, &vscsi->cmd_q.index,
 363                                       vscsi->cmd_q.base_addr);
 364         if (!crq) {
 365                 *format = (uint)UNUSED_FORMAT;
 366         } else if (crq->valid == VALID_INIT_MSG && crq->format == INIT_MSG) {
 367                 *format = (uint)INIT_MSG;
 368                 crq->valid = INVALIDATE_CMD_RESP_EL;
 369                 dma_rmb();
 370
 371                 /*
 372                  * the caller has ensured no initialize message was
 373                  * sent after the queue was
 374                  * created so there should be no other message on the queue.
 375                  */
 376                 crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask,
 377                                               &vscsi->cmd_q.index,
 378                                               vscsi->cmd_q.base_addr);
 379                 if (crq) {
 380                         *format = (uint)(crq->format);
 381                         rc = ERROR;
 382                         crq->valid = INVALIDATE_CMD_RESP_EL;
 383                         dma_rmb();
 384                 }
 385         } else {
 386                 *format = (uint)(crq->format);
 387                 rc = ERROR;
 388                 crq->valid = INVALIDATE_CMD_RESP_EL;
 389                 dma_rmb();
 390         }
 391
 392         return rc;
 393 }
 394
 395 /**
 396  * ibmvscsis_disconnect() - Helper function to disconnect
 397  * @work:       Pointer to work_struct, gives access to our adapter structure
 398  *
 399  * An error has occurred or the driver received a Transport event,
 400  * and the driver is requesting that the command queue be de-registered
 401  * in a safe manner. If there is no outstanding I/O then we can stop the
 402  * queue. If we are restarting the queue it will be reflected in the
 403  * the state of the adapter.
 404  *
 405  * EXECUTION ENVIRONMENT:
 406  *      Process environment
 407  */
 408 static void ibmvscsis_disconnect(struct work_struct *work)
 409 {
 410         struct scsi_info *vscsi = container_of(work, struct scsi_info,
 411                                                proc_work);
 412         u16 new_state;
 413         bool wait_idle = false;
 414
 415         spin_lock_bh(&vscsi->intr_lock);
 416         new_state = vscsi->new_state;
 417         vscsi->new_state = 0;
 418
 419         vscsi->flags |= DISCONNECT_SCHEDULED;
 420         vscsi->flags &= ~SCHEDULE_DISCONNECT;
 421
 422         dev_dbg(&vscsi->dev, "disconnect: flags 0x%x, state 0x%hx\n",
 423                 vscsi->flags, vscsi->state);
 424
 425         /*
 426          * check which state we are in and see if we
 427          * should transitition to the new state
 428          */
 429         switch (vscsi->state) {
 430         /* Should never be called while in this state. */
 431         case NO_QUEUE:
 432         /*
 433          * Can never transition from this state;
 434          * igonore errors and logout.
 435          */
 436         case UNCONFIGURING:
 437                 break;
 438
 439         /* can transition from this state to UNCONFIGURING */
 440         case ERR_DISCONNECT:
 441                 if (new_state == UNCONFIGURING)
 442                         vscsi->state = new_state;
 443                 break;
 444
 445         /*
 446          * Can transition from this state to to unconfiguring
 447          * or err disconnect.
 448          */
 449         case ERR_DISCONNECT_RECONNECT:
 450                 switch (new_state) {
 451                 case UNCONFIGURING:
 452                 case ERR_DISCONNECT:
 453                         vscsi->state = new_state;
 454                         break;
 455
 456                 case WAIT_IDLE:
 457                         break;
 458                 default:
 459                         break;
 460                 }
 461                 break;
 462
 463         /* can transition from this state to UNCONFIGURING */
 464         case ERR_DISCONNECTED:
 465                 if (new_state == UNCONFIGURING)
 466                         vscsi->state = new_state;
 467                 break;
 468
 469         case WAIT_ENABLED:
 470                 switch (new_state) {
 471                 case UNCONFIGURING:
 472                         vscsi->state = new_state;
 473                         vscsi->flags |= RESPONSE_Q_DOWN;
 474                         vscsi->flags &= ~(SCHEDULE_DISCONNECT |
 475                                           DISCONNECT_SCHEDULED);
 476                         dma_rmb();
 477                         if (vscsi->flags & CFG_SLEEPING) {
 478                                 vscsi->flags &= ~CFG_SLEEPING;
 479                                 complete(&vscsi->unconfig);
 480                         }
 481                         break;
 482
 483                 /* should never happen */
 484                 case ERR_DISCONNECT:
 485                 case ERR_DISCONNECT_RECONNECT:
 486                 case WAIT_IDLE:
 487                         dev_err(&vscsi->dev, "disconnect: invalid state %d for WAIT_IDLE\n",
 488                                 vscsi->state);
 489                         break;
 490                 }
 491                 break;
 492
 493         case WAIT_IDLE:
 494                 switch (new_state) {
 495                 case UNCONFIGURING:
 496                         vscsi->flags |= RESPONSE_Q_DOWN;
 497                         vscsi->state = new_state;
 498                         vscsi->flags &= ~(SCHEDULE_DISCONNECT |
 499                                           DISCONNECT_SCHEDULED);
 500                         ibmvscsis_free_command_q(vscsi);
 501                         break;
 502                 case ERR_DISCONNECT:
 503                 case ERR_DISCONNECT_RECONNECT:
 504                         vscsi->state = new_state;
 505                         break;
 506                 }
 507                 break;
 508
 509         /*
 510          * Initiator has not done a successful srp login
 511          * or has done a successful srp logout ( adapter was not
 512          * busy). In the first case there can be responses queued
 513          * waiting for space on the initiators response queue (MAD)
 514          * The second case the adapter is idle. Assume the worse case,
 515          * i.e. the second case.
 516          */
 517         case WAIT_CONNECTION:
 518         case CONNECTED:
 519         case SRP_PROCESSING:
 520                 wait_idle = true;
 521                 vscsi->state = new_state;
 522                 break;
 523
 524         /* can transition from this state to UNCONFIGURING */
 525         case UNDEFINED:
 526                 if (new_state == UNCONFIGURING)
 527                         vscsi->state = new_state;
 528                 break;
 529         default:
 530                 break;
 531         }
 532
 533         if (wait_idle) {
 534                 dev_dbg(&vscsi->dev, "disconnect start wait, active %d, sched %d\n",
 535                         (int)list_empty(&vscsi->active_q),
 536                         (int)list_empty(&vscsi->schedule_q));
 537                 if (!list_empty(&vscsi->active_q) ||
 538                     !list_empty(&vscsi->schedule_q)) {
 539                         vscsi->flags |= WAIT_FOR_IDLE;
 540                         dev_dbg(&vscsi->dev, "disconnect flags 0x%x\n",
 541                                 vscsi->flags);
 542                         /*
 543                          * This routine is can not be called with the interrupt
 544                          * lock held.
 545                          */
 546                         spin_unlock_bh(&vscsi->intr_lock);
 547                         wait_for_completion(&vscsi->wait_idle);
 548                         spin_lock_bh(&vscsi->intr_lock);
 549                 }
 550                 dev_dbg(&vscsi->dev, "disconnect stop wait\n");
 551
 552                 ibmvscsis_adapter_idle(vscsi);
 553         }
 554
 555         spin_unlock_bh(&vscsi->intr_lock);
 556 }
 557
 558 /**
 559  * ibmvscsis_post_disconnect() - Schedule the disconnect
 560  * @vscsi:      Pointer to our adapter structure
 561  * @new_state:  State to move to after disconnecting
 562  * @flag_bits:  Flags to turn on in adapter structure
 563  *
 564  * If it's already been scheduled, then see if we need to "upgrade"
 565  * the new state (if the one passed in is more "severe" than the
 566  * previous one).
 567  *
 568  * PRECONDITION:
 569  *      interrupt lock is held
 570  */
 571 static void ibmvscsis_post_disconnect(struct scsi_info *vscsi, uint new_state,
 572                                       uint flag_bits)
 573 {
 574         uint state;
 575
 576         /* check the validity of the new state */
 577         switch (new_state) {
 578         case UNCONFIGURING:
 579         case ERR_DISCONNECT:
 580         case ERR_DISCONNECT_RECONNECT:
 581         case WAIT_IDLE:
 582                 break;
 583
 584         default:
 585                 dev_err(&vscsi->dev, "post_disconnect: Invalid new state %d\n",
 586                         new_state);
 587                 return;
 588         }
 589
 590         vscsi->flags |= flag_bits;
 591
 592         dev_dbg(&vscsi->dev, "post_disconnect: new_state 0x%x, flag_bits 0x%x, vscsi->flags 0x%x, state %hx\n",
 593                 new_state, flag_bits, vscsi->flags, vscsi->state);
 594
 595         if (!(vscsi->flags & (DISCONNECT_SCHEDULED | SCHEDULE_DISCONNECT))) {
 596                 vscsi->flags |= SCHEDULE_DISCONNECT;
 597                 vscsi->new_state = new_state;
 598
 599                 INIT_WORK(&vscsi->proc_work, ibmvscsis_disconnect);
 600                 (void)queue_work(vscsi->work_q, &vscsi->proc_work);
 601         } else {
 602                 if (vscsi->new_state)
 603                         state = vscsi->new_state;
 604                 else
 605                         state = vscsi->state;
 606
 607                 switch (state) {
 608                 case NO_QUEUE:
 609                 case UNCONFIGURING:
 610                         break;
 611
 612                 case ERR_DISCONNECTED:
 613                 case ERR_DISCONNECT:
 614                 case UNDEFINED:
 615                         if (new_state == UNCONFIGURING)
 616                                 vscsi->new_state = new_state;
 617                         break;
 618
 619                 case ERR_DISCONNECT_RECONNECT:
 620                         switch (new_state) {
 621                         case UNCONFIGURING:
 622                         case ERR_DISCONNECT:
 623                                 vscsi->new_state = new_state;
 624                                 break;
 625                         default:
 626                                 break;
 627                         }
 628                         break;
 629
 630                 case WAIT_ENABLED:
 631                 case WAIT_IDLE:
 632                 case WAIT_CONNECTION:
 633                 case CONNECTED:
 634                 case SRP_PROCESSING:
 635                         vscsi->new_state = new_state;
 636                         break;
 637
 638                 default:
 639                         break;
 640                 }
 641         }
 642
 643         dev_dbg(&vscsi->dev, "Leaving post_disconnect: flags 0x%x, new_state 0x%x\n",
 644                 vscsi->flags, vscsi->new_state);
 645 }
 646
 647 /**
 648  * ibmvscsis_handle_init_compl_msg() - Respond to an Init Complete Message
 649  * @vscsi:      Pointer to our adapter structure
 650  *
 651  * Must be called with interrupt lock held.
 652  */
 653 static long ibmvscsis_handle_init_compl_msg(struct scsi_info *vscsi)
 654 {
 655         long rc = ADAPT_SUCCESS;
 656
 657         switch (vscsi->state) {
 658         case NO_QUEUE:
 659         case ERR_DISCONNECT:
 660         case ERR_DISCONNECT_RECONNECT:
 661         case ERR_DISCONNECTED:
 662         case UNCONFIGURING:
 663         case UNDEFINED:
 664                 rc = ERROR;
 665                 break;
 666
 667         case WAIT_CONNECTION:
 668                 vscsi->state = CONNECTED;
 669                 break;
 670
 671         case WAIT_IDLE:
 672         case SRP_PROCESSING:
 673         case CONNECTED:
 674         case WAIT_ENABLED:
 675         default:
 676                 rc = ERROR;
 677                 dev_err(&vscsi->dev, "init_msg: invalid state %d to get init compl msg\n",
 678                         vscsi->state);
 679                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
 680                 break;
 681         }
 682
 683         return rc;
 684 }
 685
 686 /**
 687  * ibmvscsis_handle_init_msg() - Respond to an Init Message
 688  * @vscsi:      Pointer to our adapter structure
 689  *
 690  * Must be called with interrupt lock held.
 691  */
 692 static long ibmvscsis_handle_init_msg(struct scsi_info *vscsi)
 693 {
 694         long rc = ADAPT_SUCCESS;
 695
 696         switch (vscsi->state) {
 697         case WAIT_CONNECTION:
 698                 rc = ibmvscsis_send_init_message(vscsi, INIT_COMPLETE_MSG);
 699                 switch (rc) {
 700                 case H_SUCCESS:
 701                         vscsi->state = CONNECTED;
 702                         break;
 703
 704                 case H_PARAMETER:
 705                         dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n",
 706                                 rc);
 707                         ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
 708                         break;
 709
 710                 case H_DROPPED:
 711                         dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n",
 712                                 rc);
 713                         rc = ERROR;
 714                         ibmvscsis_post_disconnect(vscsi,
 715                                                   ERR_DISCONNECT_RECONNECT, 0);
 716                         break;
 717
 718                 case H_CLOSED:
 719                         dev_warn(&vscsi->dev, "init_msg: failed to send, rc %ld\n",
 720                                  rc);
 721                         rc = 0;
 722                         break;
 723                 }
 724                 break;
 725
 726         case UNDEFINED:
 727                 rc = ERROR;
 728                 break;
 729
 730         case UNCONFIGURING:
 731                 break;
 732
 733         case WAIT_ENABLED:
 734         case CONNECTED:
 735         case SRP_PROCESSING:
 736         case WAIT_IDLE:
 737         case NO_QUEUE:
 738         case ERR_DISCONNECT:
 739         case ERR_DISCONNECT_RECONNECT:
 740         case ERR_DISCONNECTED:
 741         default:
 742                 rc = ERROR;
 743                 dev_err(&vscsi->dev, "init_msg: invalid state %d to get init msg\n",
 744                         vscsi->state);
 745                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
 746                 break;
 747         }
 748
 749         return rc;
 750 }
 751
 752 /**
 753  * ibmvscsis_init_msg() - Respond to an init message
 754  * @vscsi:      Pointer to our adapter structure
 755  * @crq:        Pointer to CRQ element containing the Init Message
 756  *
 757  * EXECUTION ENVIRONMENT:
 758  *      Interrupt, interrupt lock held
 759  */
 760 static long ibmvscsis_init_msg(struct scsi_info *vscsi, struct viosrp_crq *crq)
 761 {
 762         long rc = ADAPT_SUCCESS;
 763
 764         dev_dbg(&vscsi->dev, "init_msg: state 0x%hx\n", vscsi->state);
 765
 766         rc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO,
 767                       (u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0,
 768                       0);
 769         if (rc == H_SUCCESS) {
 770                 vscsi->client_data.partition_number =
 771                         be64_to_cpu(*(u64 *)vscsi->map_buf);
 772                 dev_dbg(&vscsi->dev, "init_msg, part num %d\n",
 773                         vscsi->client_data.partition_number);
 774         } else {
 775                 dev_dbg(&vscsi->dev, "init_msg h_vioctl rc %ld\n", rc);
 776                 rc = ADAPT_SUCCESS;
 777         }
 778
 779         if (crq->format == INIT_MSG) {
 780                 rc = ibmvscsis_handle_init_msg(vscsi);
 781         } else if (crq->format == INIT_COMPLETE_MSG) {
 782                 rc = ibmvscsis_handle_init_compl_msg(vscsi);
 783         } else {
 784                 rc = ERROR;
 785                 dev_err(&vscsi->dev, "init_msg: invalid format %d\n",
 786                         (uint)crq->format);
 787                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
 788         }
 789
 790         return rc;
 791 }
 792
 793 /**
 794  * ibmvscsis_establish_new_q() - Establish new CRQ queue
 795  * @vscsi:      Pointer to our adapter structure
 796  *
 797  * Must be called with interrupt lock held.
 798  */
 799 static long ibmvscsis_establish_new_q(struct scsi_info *vscsi)
 800 {
 801         long rc = ADAPT_SUCCESS;
 802         uint format;
 803
 804         rc = h_vioctl(vscsi->dds.unit_id, H_ENABLE_PREPARE_FOR_SUSPEND, 30000,
 805                       0, 0, 0, 0);
 806         if (rc == H_SUCCESS)
 807                 vscsi->flags |= PREP_FOR_SUSPEND_ENABLED;
 808         else if (rc != H_NOT_FOUND)
 809                 dev_err(&vscsi->dev, "Error from Enable Prepare for Suspend: %ld\n",
 810                         rc);
 811
 812         vscsi->flags &= PRESERVE_FLAG_FIELDS;
 813         vscsi->rsp_q_timer.timer_pops = 0;
 814         vscsi->debit = 0;
 815         vscsi->credit = 0;
 816
 817         rc = vio_enable_interrupts(vscsi->dma_dev);
 818         if (rc) {
 819                 dev_warn(&vscsi->dev, "establish_new_q: failed to enable interrupts, rc %ld\n",
 820                          rc);
 821                 return rc;
 822         }
 823
 824         rc = ibmvscsis_check_init_msg(vscsi, &format);
 825         if (rc) {
 826                 dev_err(&vscsi->dev, "establish_new_q: check_init_msg failed, rc %ld\n",
 827                         rc);
 828                 return rc;
 829         }
 830
 831         if (format == UNUSED_FORMAT) {
 832                 rc = ibmvscsis_send_init_message(vscsi, INIT_MSG);
 833                 switch (rc) {
 834                 case H_SUCCESS:
 835                 case H_DROPPED:
 836                 case H_CLOSED:
 837                         rc = ADAPT_SUCCESS;
 838                         break;
 839
 840                 case H_PARAMETER:
 841                 case H_HARDWARE:
 842                         break;
 843
 844                 default:
 845                         vscsi->state = UNDEFINED;
 846                         rc = H_HARDWARE;
 847                         break;
 848                 }
 849         } else if (format == INIT_MSG) {
 850                 rc = ibmvscsis_handle_init_msg(vscsi);
 851         }
 852
 853         return rc;
 854 }
 855
 856 /**
 857  * ibmvscsis_reset_queue() - Reset CRQ Queue
 858  * @vscsi:      Pointer to our adapter structure
 859  *
 860  * This function calls h_free_q and then calls h_reg_q and does all
 861  * of the bookkeeping to get us back to where we can communicate.
 862  *
 863  * Actually, we don't always call h_free_crq.  A problem was discovered
 864  * where one partition would close and reopen his queue, which would
 865  * cause his partner to get a transport event, which would cause him to
 866  * close and reopen his queue, which would cause the original partition
 867  * to get a transport event, etc., etc.  To prevent this, we don't
 868  * actually close our queue if the client initiated the reset, (i.e.
 869  * either we got a transport event or we have detected that the client's
 870  * queue is gone)
 871  *
 872  * EXECUTION ENVIRONMENT:
 873  *      Process environment, called with interrupt lock held
 874  */
 875 static void ibmvscsis_reset_queue(struct scsi_info *vscsi)
 876 {
 877         int bytes;
 878         long rc = ADAPT_SUCCESS;
 879
 880         dev_dbg(&vscsi->dev, "reset_queue: flags 0x%x\n", vscsi->flags);
 881
 882         /* don't reset, the client did it for us */
 883         if (vscsi->flags & (CLIENT_FAILED | TRANS_EVENT)) {
 884                 vscsi->flags &= PRESERVE_FLAG_FIELDS;
 885                 vscsi->rsp_q_timer.timer_pops = 0;
 886                 vscsi->debit = 0;
 887                 vscsi->credit = 0;
 888                 vscsi->state = WAIT_CONNECTION;
 889                 vio_enable_interrupts(vscsi->dma_dev);
 890         } else {
 891                 rc = ibmvscsis_free_command_q(vscsi);
 892                 if (rc == ADAPT_SUCCESS) {
 893                         vscsi->state = WAIT_CONNECTION;
 894
 895                         bytes = vscsi->cmd_q.size * PAGE_SIZE;
 896                         rc = h_reg_crq(vscsi->dds.unit_id,
 897                                        vscsi->cmd_q.crq_token, bytes);
 898                         if (rc == H_CLOSED || rc == H_SUCCESS) {
 899                                 rc = ibmvscsis_establish_new_q(vscsi);
 900                         }
 901
 902                         if (rc != ADAPT_SUCCESS) {
 903                                 dev_dbg(&vscsi->dev, "reset_queue: reg_crq rc %ld\n",
 904                                         rc);
 905
 906                                 vscsi->state = ERR_DISCONNECTED;
 907                                 vscsi->flags |= RESPONSE_Q_DOWN;
 908                                 ibmvscsis_free_command_q(vscsi);
 909                         }
 910                 } else {
 911                         vscsi->state = ERR_DISCONNECTED;
 912                         vscsi->flags |= RESPONSE_Q_DOWN;
 913                 }
 914         }
 915 }
 916
 917 /**
 918  * ibmvscsis_free_cmd_resources() - Free command resources
 919  * @vscsi:      Pointer to our adapter structure
 920  * @cmd:        Command which is not longer in use
 921  *
 922  * Must be called with interrupt lock held.
 923  */
 924 static void ibmvscsis_free_cmd_resources(struct scsi_info *vscsi,
 925                                          struct ibmvscsis_cmd *cmd)
 926 {
 927         struct iu_entry *iue = cmd->iue;
 928
 929         switch (cmd->type) {
 930         case TASK_MANAGEMENT:
 931         case SCSI_CDB:
 932                 /*
 933                  * When the queue goes down this value is cleared, so it
 934                  * cannot be cleared in this general purpose function.
 935                  */
 936                 if (vscsi->debit)
 937                         vscsi->debit -= 1;
 938                 break;
 939         case ADAPTER_MAD:
 940                 vscsi->flags &= ~PROCESSING_MAD;
 941                 break;
 942         case UNSET_TYPE:
 943                 break;
 944         default:
 945                 dev_err(&vscsi->dev, "free_cmd_resources unknown type %d\n",
 946                         cmd->type);
 947                 break;
 948         }
 949
 950         cmd->iue = NULL;
 951         list_add_tail(&cmd->list, &vscsi->free_cmd);
 952         srp_iu_put(iue);
 953
 954         if (list_empty(&vscsi->active_q) && list_empty(&vscsi->schedule_q) &&
 955             list_empty(&vscsi->waiting_rsp) && (vscsi->flags & WAIT_FOR_IDLE)) {
 956                 vscsi->flags &= ~WAIT_FOR_IDLE;
 957                 complete(&vscsi->wait_idle);
 958         }
 959 }
 960
 961 /**
 962  * ibmvscsis_ready_for_suspend() - Helper function to call VIOCTL
 963  * @vscsi:      Pointer to our adapter structure
 964  * @idle:       Indicates whether we were called from adapter_idle.  This
 965  *              is important to know if we need to do a disconnect, since if
 966  *              we're called from adapter_idle, we're still processing the
 967  *              current disconnect, so we can't just call post_disconnect.
 968  *
 969  * This function is called when the adapter is idle when phyp has sent
 970  * us a Prepare for Suspend Transport Event.
 971  *
 972  * EXECUTION ENVIRONMENT:
 973  *      Process or interrupt environment called with interrupt lock held
 974  */
 975 static long ibmvscsis_ready_for_suspend(struct scsi_info *vscsi, bool idle)
 976 {
 977         long rc = 0;
 978         struct viosrp_crq *crq;
 979
 980         /* See if there is a Resume event in the queue */
 981         crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
 982
 983         dev_dbg(&vscsi->dev, "ready_suspend: flags 0x%x, state 0x%hx crq_valid:%x\n",
 984                 vscsi->flags, vscsi->state, (int)crq->valid);
 985
 986         if (!(vscsi->flags & PREP_FOR_SUSPEND_ABORTED) && !(crq->valid)) {
 987                 rc = h_vioctl(vscsi->dds.unit_id, H_READY_FOR_SUSPEND, 0, 0, 0,
 988                               0, 0);
 989                 if (rc) {
 990                         dev_err(&vscsi->dev, "Ready for Suspend Vioctl failed: %ld\n",
 991                                 rc);
 992                         rc = 0;
 993                 }
 994         } else if (((vscsi->flags & PREP_FOR_SUSPEND_OVERWRITE) &&
 995                     (vscsi->flags & PREP_FOR_SUSPEND_ABORTED)) ||
 996                    ((crq->valid) && ((crq->valid != VALID_TRANS_EVENT) ||
 997                                      (crq->format != RESUME_FROM_SUSP)))) {
 998                 if (idle) {
 999                         vscsi->state = ERR_DISCONNECT_RECONNECT;
1000                         ibmvscsis_reset_queue(vscsi);
1001                         rc = -1;
1002                 } else if (vscsi->state == CONNECTED) {
1003                         ibmvscsis_post_disconnect(vscsi,
1004                                                   ERR_DISCONNECT_RECONNECT, 0);
1005                 }
1006
1007                 vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE;
1008
1009                 if ((crq->valid) && ((crq->valid != VALID_TRANS_EVENT) ||
1010                                      (crq->format != RESUME_FROM_SUSP)))
1011                         dev_err(&vscsi->dev, "Invalid element in CRQ after Prepare for Suspend");
1012         }
1013
1014         vscsi->flags &= ~(PREP_FOR_SUSPEND_PENDING | PREP_FOR_SUSPEND_ABORTED);
1015
1016         return rc;
1017 }
1018
1019 /**
1020  * ibmvscsis_trans_event() - Handle a Transport Event
1021  * @vscsi:      Pointer to our adapter structure
1022  * @crq:        Pointer to CRQ entry containing the Transport Event
1023  *
1024  * Do the logic to close the I_T nexus.  This function may not
1025  * behave to specification.
1026  *
1027  * EXECUTION ENVIRONMENT:
1028  *      Interrupt, interrupt lock held
1029  */
1030 static long ibmvscsis_trans_event(struct scsi_info *vscsi,
1031                                   struct viosrp_crq *crq)
1032 {
1033         long rc = ADAPT_SUCCESS;
1034
1035         dev_dbg(&vscsi->dev, "trans_event: format %d, flags 0x%x, state 0x%hx\n",
1036                 (int)crq->format, vscsi->flags, vscsi->state);
1037
1038         switch (crq->format) {
1039         case MIGRATED:
1040         case PARTNER_FAILED:
1041         case PARTNER_DEREGISTER:
1042                 ibmvscsis_delete_client_info(vscsi, true);
1043                 if (crq->format == MIGRATED)
1044                         vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE;
1045                 switch (vscsi->state) {
1046                 case NO_QUEUE:
1047                 case ERR_DISCONNECTED:
1048                 case UNDEFINED:
1049                         break;
1050
1051                 case UNCONFIGURING:
1052                         vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT);
1053                         break;
1054
1055                 case WAIT_ENABLED:
1056                         break;
1057
1058                 case WAIT_CONNECTION:
1059                         break;
1060
1061                 case CONNECTED:
1062                         ibmvscsis_post_disconnect(vscsi, WAIT_IDLE,
1063                                                   (RESPONSE_Q_DOWN |
1064                                                    TRANS_EVENT));
1065                         break;
1066
1067                 case SRP_PROCESSING:
1068                         if ((vscsi->debit > 0) ||
1069                             !list_empty(&vscsi->schedule_q) ||
1070                             !list_empty(&vscsi->waiting_rsp) ||
1071                             !list_empty(&vscsi->active_q)) {
1072                                 dev_dbg(&vscsi->dev, "debit %d, sched %d, wait %d, active %d\n",
1073                                         vscsi->debit,
1074                                         (int)list_empty(&vscsi->schedule_q),
1075                                         (int)list_empty(&vscsi->waiting_rsp),
1076                                         (int)list_empty(&vscsi->active_q));
1077                                 dev_warn(&vscsi->dev, "connection lost with outstanding work\n");
1078                         } else {
1079                                 dev_dbg(&vscsi->dev, "trans_event: SRP Processing, but no outstanding work\n");
1080                         }
1081
1082                         ibmvscsis_post_disconnect(vscsi, WAIT_IDLE,
1083                                                   (RESPONSE_Q_DOWN |
1084                                                    TRANS_EVENT));
1085                         break;
1086
1087                 case ERR_DISCONNECT:
1088                 case ERR_DISCONNECT_RECONNECT:
1089                 case WAIT_IDLE:
1090                         vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT);
1091                         break;
1092                 }
1093                 break;
1094
1095         case PREPARE_FOR_SUSPEND:
1096                 dev_dbg(&vscsi->dev, "Prep for Suspend, crq status = 0x%x\n",
1097                         (int)crq->status);
1098                 switch (vscsi->state) {
1099                 case ERR_DISCONNECTED:
1100                 case WAIT_CONNECTION:
1101                 case CONNECTED:
1102                         ibmvscsis_ready_for_suspend(vscsi, false);
1103                         break;
1104                 case SRP_PROCESSING:
1105                         vscsi->resume_state = vscsi->state;
1106                         vscsi->flags |= PREP_FOR_SUSPEND_PENDING;
1107                         if (crq->status == CRQ_ENTRY_OVERWRITTEN)
1108                                 vscsi->flags |= PREP_FOR_SUSPEND_OVERWRITE;
1109                         ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, 0);
1110                         break;
1111                 case NO_QUEUE:
1112                 case UNDEFINED:
1113                 case UNCONFIGURING:
1114                 case WAIT_ENABLED:
1115                 case ERR_DISCONNECT:
1116                 case ERR_DISCONNECT_RECONNECT:
1117                 case WAIT_IDLE:
1118                         dev_err(&vscsi->dev, "Invalid state for Prepare for Suspend Trans Event: 0x%x\n",
1119                                 vscsi->state);
1120                         break;
1121                 }
1122                 break;
1123
1124         case RESUME_FROM_SUSP:
1125                 dev_dbg(&vscsi->dev, "Resume from Suspend, crq status = 0x%x\n",
1126                         (int)crq->status);
1127                 if (vscsi->flags & PREP_FOR_SUSPEND_PENDING) {
1128                         vscsi->flags |= PREP_FOR_SUSPEND_ABORTED;
1129                 } else {
1130                         if ((crq->status == CRQ_ENTRY_OVERWRITTEN) ||
1131                             (vscsi->flags & PREP_FOR_SUSPEND_OVERWRITE)) {
1132                                 ibmvscsis_post_disconnect(vscsi,
1133                                                           ERR_DISCONNECT_RECONNECT,
1134                                                           0);
1135                                 vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE;
1136                         }
1137                 }
1138                 break;
1139
1140         default:
1141                 rc = ERROR;
1142                 dev_err(&vscsi->dev, "trans_event: invalid format %d\n",
1143                         (uint)crq->format);
1144                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT,
1145                                           RESPONSE_Q_DOWN);
1146                 break;
1147         }
1148
1149         rc = vscsi->flags & SCHEDULE_DISCONNECT;
1150
1151         dev_dbg(&vscsi->dev, "Leaving trans_event: flags 0x%x, state 0x%hx, rc %ld\n",
1152                 vscsi->flags, vscsi->state, rc);
1153
1154         return rc;
1155 }
1156
1157 /**
1158  * ibmvscsis_poll_cmd_q() - Poll Command Queue
1159  * @vscsi:      Pointer to our adapter structure
1160  *
1161  * Called to handle command elements that may have arrived while
1162  * interrupts were disabled.
1163  *
1164  * EXECUTION ENVIRONMENT:
1165  *      intr_lock must be held
1166  */
1167 static void ibmvscsis_poll_cmd_q(struct scsi_info *vscsi)
1168 {
1169         struct viosrp_crq *crq;
1170         long rc;
1171         bool ack = true;
1172         volatile u8 valid;
1173
1174         dev_dbg(&vscsi->dev, "poll_cmd_q: flags 0x%x, state 0x%hx, q index %ud\n",
1175                 vscsi->flags, vscsi->state, vscsi->cmd_q.index);
1176
1177         rc = vscsi->flags & SCHEDULE_DISCONNECT;
1178         crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
1179         valid = crq->valid;
1180         dma_rmb();
1181
1182         while (valid) {
1183 poll_work:
1184                 vscsi->cmd_q.index =
1185                         (vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask;
1186
1187                 if (!rc) {
1188                         rc = ibmvscsis_parse_command(vscsi, crq);
1189                 } else {
1190                         if ((uint)crq->valid == VALID_TRANS_EVENT) {
1191                                 /*
1192                                  * must service the transport layer events even
1193                                  * in an error state, dont break out until all
1194                                  * the consecutive transport events have been
1195                                  * processed
1196                                  */
1197                                 rc = ibmvscsis_trans_event(vscsi, crq);
1198                         } else if (vscsi->flags & TRANS_EVENT) {
1199                                 /*
1200                                  * if a tranport event has occurred leave
1201                                  * everything but transport events on the queue
1202                                  */
1203                                 dev_dbg(&vscsi->dev, "poll_cmd_q, ignoring\n");
1204
1205                                 /*
1206                                  * need to decrement the queue index so we can
1207                                  * look at the elment again
1208                                  */
1209                                 if (vscsi->cmd_q.index)
1210                                         vscsi->cmd_q.index -= 1;
1211                                 else
1212                                         /*
1213                                          * index is at 0 it just wrapped.
1214                                          * have it index last element in q
1215                                          */
1216                                         vscsi->cmd_q.index = vscsi->cmd_q.mask;
1217                                 break;
1218                         }
1219                 }
1220
1221                 crq->valid = INVALIDATE_CMD_RESP_EL;
1222
1223                 crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
1224                 valid = crq->valid;
1225                 dma_rmb();
1226         }
1227
1228         if (!rc) {
1229                 if (ack) {
1230                         vio_enable_interrupts(vscsi->dma_dev);
1231                         ack = false;
1232                         dev_dbg(&vscsi->dev, "poll_cmd_q, reenabling interrupts\n");
1233                 }
1234                 valid = crq->valid;
1235                 dma_rmb();
1236                 if (valid)
1237                         goto poll_work;
1238         }
1239
1240         dev_dbg(&vscsi->dev, "Leaving poll_cmd_q: rc %ld\n", rc);
1241 }
1242
1243 /**
1244  * ibmvscsis_free_cmd_qs() - Free elements in queue
1245  * @vscsi:      Pointer to our adapter structure
1246  *
1247  * Free all of the elements on all queues that are waiting for
1248  * whatever reason.
1249  *
1250  * PRECONDITION:
1251  *      Called with interrupt lock held
1252  */
1253 static void ibmvscsis_free_cmd_qs(struct scsi_info *vscsi)
1254 {
1255         struct ibmvscsis_cmd *cmd, *nxt;
1256
1257         dev_dbg(&vscsi->dev, "free_cmd_qs: waiting_rsp empty %d, timer starter %d\n",
1258                 (int)list_empty(&vscsi->waiting_rsp),
1259                 vscsi->rsp_q_timer.started);
1260
1261         list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp, list) {
1262                 list_del(&cmd->list);
1263                 ibmvscsis_free_cmd_resources(vscsi, cmd);
1264         }
1265 }
1266
1267 /**
1268  * ibmvscsis_get_free_cmd() - Get free command from list
1269  * @vscsi:      Pointer to our adapter structure
1270  *
1271  * Must be called with interrupt lock held.
1272  */
1273 static struct ibmvscsis_cmd *ibmvscsis_get_free_cmd(struct scsi_info *vscsi)
1274 {
1275         struct ibmvscsis_cmd *cmd = NULL;
1276         struct iu_entry *iue;
1277
1278         iue = srp_iu_get(&vscsi->target);
1279         if (iue) {
1280                 cmd = list_first_entry_or_null(&vscsi->free_cmd,
1281                                                struct ibmvscsis_cmd, list);
1282                 if (cmd) {
1283                         if (cmd->abort_cmd)
1284                                 cmd->abort_cmd = NULL;
1285                         cmd->flags &= ~(DELAY_SEND);
1286                         list_del(&cmd->list);
1287                         cmd->iue = iue;
1288                         cmd->type = UNSET_TYPE;
1289                         memset(&cmd->se_cmd, 0, sizeof(cmd->se_cmd));
1290                 } else {
1291                         srp_iu_put(iue);
1292                 }
1293         }
1294
1295         return cmd;
1296 }
1297
1298 /**
1299  * ibmvscsis_adapter_idle() - Helper function to handle idle adapter
1300  * @vscsi:      Pointer to our adapter structure
1301  *
1302  * This function is called when the adapter is idle when the driver
1303  * is attempting to clear an error condition.
1304  * The adapter is considered busy if any of its cmd queues
1305  * are non-empty. This function can be invoked
1306  * from the off level disconnect function.
1307  *
1308  * EXECUTION ENVIRONMENT:
1309  *      Process environment called with interrupt lock held
1310  */
1311 static void ibmvscsis_adapter_idle(struct scsi_info *vscsi)
1312 {
1313         int free_qs = false;
1314         long rc = 0;
1315
1316         dev_dbg(&vscsi->dev, "adapter_idle: flags 0x%x, state 0x%hx\n",
1317                 vscsi->flags, vscsi->state);
1318
1319         /* Only need to free qs if we're disconnecting from client */
1320         if (vscsi->state != WAIT_CONNECTION || vscsi->flags & TRANS_EVENT)
1321                 free_qs = true;
1322
1323         switch (vscsi->state) {
1324         case UNCONFIGURING:
1325                 ibmvscsis_free_command_q(vscsi);
1326                 dma_rmb();
1327                 isync();
1328                 if (vscsi->flags & CFG_SLEEPING) {
1329                         vscsi->flags &= ~CFG_SLEEPING;
1330                         complete(&vscsi->unconfig);
1331                 }
1332                 break;
1333         case ERR_DISCONNECT_RECONNECT:
1334                 ibmvscsis_reset_queue(vscsi);
1335                 dev_dbg(&vscsi->dev, "adapter_idle, disc_rec: flags 0x%x\n",
1336                         vscsi->flags);
1337                 break;
1338
1339         case ERR_DISCONNECT:
1340                 ibmvscsis_free_command_q(vscsi);
1341                 vscsi->flags &= ~(SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED);
1342                 vscsi->flags |= RESPONSE_Q_DOWN;
1343                 if (vscsi->tport.enabled)
1344                         vscsi->state = ERR_DISCONNECTED;
1345                 else
1346                         vscsi->state = WAIT_ENABLED;
1347                 dev_dbg(&vscsi->dev, "adapter_idle, disc: flags 0x%x, state 0x%hx\n",
1348                         vscsi->flags, vscsi->state);
1349                 break;
1350
1351         case WAIT_IDLE:
1352                 vscsi->rsp_q_timer.timer_pops = 0;
1353                 vscsi->debit = 0;
1354                 vscsi->credit = 0;
1355                 if (vscsi->flags & PREP_FOR_SUSPEND_PENDING) {
1356                         vscsi->state = vscsi->resume_state;
1357                         vscsi->resume_state = 0;
1358                         rc = ibmvscsis_ready_for_suspend(vscsi, true);
1359                         vscsi->flags &= ~DISCONNECT_SCHEDULED;
1360                         if (rc)
1361                                 break;
1362                 } else if (vscsi->flags & TRANS_EVENT) {
1363                         vscsi->state = WAIT_CONNECTION;
1364                         vscsi->flags &= PRESERVE_FLAG_FIELDS;
1365                 } else {
1366                         vscsi->state = CONNECTED;
1367                         vscsi->flags &= ~DISCONNECT_SCHEDULED;
1368                 }
1369
1370                 dev_dbg(&vscsi->dev, "adapter_idle, wait: flags 0x%x, state 0x%hx\n",
1371                         vscsi->flags, vscsi->state);
1372                 ibmvscsis_poll_cmd_q(vscsi);
1373                 break;
1374
1375         case ERR_DISCONNECTED:
1376                 vscsi->flags &= ~DISCONNECT_SCHEDULED;
1377                 dev_dbg(&vscsi->dev, "adapter_idle, disconnected: flags 0x%x, state 0x%hx\n",
1378                         vscsi->flags, vscsi->state);
1379                 break;
1380
1381         default:
1382                 dev_err(&vscsi->dev, "adapter_idle: in invalid state %d\n",
1383                         vscsi->state);
1384                 break;
1385         }
1386
1387         if (free_qs)
1388                 ibmvscsis_free_cmd_qs(vscsi);
1389
1390         /*
1391          * There is a timing window where we could lose a disconnect request.
1392          * The known path to this window occurs during the DISCONNECT_RECONNECT
1393          * case above: reset_queue calls free_command_q, which will release the
1394          * interrupt lock.  During that time, a new post_disconnect call can be
1395          * made with a "more severe" state (DISCONNECT or UNCONFIGURING).
1396          * Because the DISCONNECT_SCHEDULED flag is already set, post_disconnect
1397          * will only set the new_state.  Now free_command_q reacquires the intr
1398          * lock and clears the DISCONNECT_SCHEDULED flag (using PRESERVE_FLAG_
1399          * FIELDS), and the disconnect is lost.  This is particularly bad when
1400          * the new disconnect was for UNCONFIGURING, since the unconfigure hangs
1401          * forever.
1402          * Fix is that free command queue sets acr state and acr flags if there
1403          * is a change under the lock
1404          * note free command queue writes to this state it clears it
1405          * before releasing the lock, different drivers call the free command
1406          * queue different times so dont initialize above
1407          */
1408         if (vscsi->phyp_acr_state != 0) {
1409                 /*
1410                  * set any bits in flags that may have been cleared by
1411                  * a call to free command queue in switch statement
1412                  * or reset queue
1413                  */
1414                 vscsi->flags |= vscsi->phyp_acr_flags;
1415                 ibmvscsis_post_disconnect(vscsi, vscsi->phyp_acr_state, 0);
1416                 vscsi->phyp_acr_state = 0;
1417                 vscsi->phyp_acr_flags = 0;
1418
1419                 dev_dbg(&vscsi->dev, "adapter_idle: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n",
1420                         vscsi->flags, vscsi->state, vscsi->phyp_acr_flags,
1421                         vscsi->phyp_acr_state);
1422         }
1423
1424         dev_dbg(&vscsi->dev, "Leaving adapter_idle: flags 0x%x, state 0x%hx, new_state 0x%x\n",
1425                 vscsi->flags, vscsi->state, vscsi->new_state);
1426 }
1427
1428 /**
1429  * ibmvscsis_copy_crq_packet() - Copy CRQ Packet
1430  * @vscsi:      Pointer to our adapter structure
1431  * @cmd:        Pointer to command element to use to process the request
1432  * @crq:        Pointer to CRQ entry containing the request
1433  *
1434  * Copy the srp information unit from the hosted
1435  * partition using remote dma
1436  *
1437  * EXECUTION ENVIRONMENT:
1438  *      Interrupt, interrupt lock held
1439  */
1440 static long ibmvscsis_copy_crq_packet(struct scsi_info *vscsi,
1441                                       struct ibmvscsis_cmd *cmd,
1442                                       struct viosrp_crq *crq)
1443 {
1444         struct iu_entry *iue = cmd->iue;
1445         long rc = 0;
1446         u16 len;
1447
1448         len = be16_to_cpu(crq->IU_length);
1449         if ((len > SRP_MAX_IU_LEN) || (len == 0)) {
1450                 dev_err(&vscsi->dev, "copy_crq: Invalid len %d passed", len);
1451                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
1452                 return SRP_VIOLATION;
1453         }
1454
1455         rc = h_copy_rdma(len, vscsi->dds.window[REMOTE].liobn,
1456                          be64_to_cpu(crq->IU_data_ptr),
1457                          vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma);
1458
1459         switch (rc) {
1460         case H_SUCCESS:
1461                 cmd->init_time = mftb();
1462                 iue->remote_token = crq->IU_data_ptr;
1463                 iue->iu_len = len;
1464                 dev_dbg(&vscsi->dev, "copy_crq: ioba 0x%llx, init_time 0x%llx\n",
1465                         be64_to_cpu(crq->IU_data_ptr), cmd->init_time);
1466                 break;
1467         case H_PERMISSION:
1468                 if (connection_broken(vscsi))
1469                         ibmvscsis_post_disconnect(vscsi,
1470                                                   ERR_DISCONNECT_RECONNECT,
1471                                                   (RESPONSE_Q_DOWN |
1472                                                    CLIENT_FAILED));
1473                 else
1474                         ibmvscsis_post_disconnect(vscsi,
1475                                                   ERR_DISCONNECT_RECONNECT, 0);
1476
1477                 dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n",
1478                         rc);
1479                 break;
1480         case H_DEST_PARM:
1481         case H_SOURCE_PARM:
1482         default:
1483                 dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n",
1484                         rc);
1485                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
1486                 break;
1487         }
1488
1489         return rc;
1490 }
1491
1492 /**
1493  * ibmvscsis_adapter_info - Service an Adapter Info MAnagement Data gram
1494  * @vscsi:      Pointer to our adapter structure
1495  * @iue:        Information Unit containing the Adapter Info MAD request
1496  *
1497  * EXECUTION ENVIRONMENT:
1498  *      Interrupt adapter lock is held
1499  */
1500 static long ibmvscsis_adapter_info(struct scsi_info *vscsi,
1501                                    struct iu_entry *iue)
1502 {
1503         struct viosrp_adapter_info *mad = &vio_iu(iue)->mad.adapter_info;
1504         struct mad_adapter_info_data *info;
1505         uint flag_bits = 0;
1506         dma_addr_t token;
1507         long rc;
1508
1509         mad->common.status = cpu_to_be16(VIOSRP_MAD_SUCCESS);
1510
1511         if (be16_to_cpu(mad->common.length) > sizeof(*info)) {
1512                 mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
1513                 return 0;
1514         }
1515
1516         info = dma_alloc_coherent(&vscsi->dma_dev->dev, sizeof(*info), &token,
1517                                   GFP_ATOMIC);
1518         if (!info) {
1519                 dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n",
1520                         iue->target);
1521                 mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
1522                 return 0;
1523         }
1524
1525         /* Get remote info */
1526         rc = h_copy_rdma(be16_to_cpu(mad->common.length),
1527                          vscsi->dds.window[REMOTE].liobn,
1528                          be64_to_cpu(mad->buffer),
1529                          vscsi->dds.window[LOCAL].liobn, token);
1530
1531         if (rc != H_SUCCESS) {
1532                 if (rc == H_PERMISSION) {
1533                         if (connection_broken(vscsi))
1534                                 flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED);
1535                 }
1536                 dev_warn(&vscsi->dev, "adapter_info: h_copy_rdma from client failed, rc %ld\n",
1537                          rc);
1538                 dev_dbg(&vscsi->dev, "adapter_info: ioba 0x%llx, flags 0x%x, flag_bits 0x%x\n",
1539                         be64_to_cpu(mad->buffer), vscsi->flags, flag_bits);
1540                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
1541                                           flag_bits);
1542                 goto free_dma;
1543         }
1544
1545         /*
1546          * Copy client info, but ignore partition number, which we
1547          * already got from phyp - unless we failed to get it from
1548          * phyp (e.g. if we're running on a p5 system).
1549          */
1550         if (vscsi->client_data.partition_number == 0)
1551                 vscsi->client_data.partition_number =
1552                         be32_to_cpu(info->partition_number);
1553         strncpy(vscsi->client_data.srp_version, info->srp_version,
1554                 sizeof(vscsi->client_data.srp_version));
1555         strncpy(vscsi->client_data.partition_name, info->partition_name,
1556                 sizeof(vscsi->client_data.partition_name));
1557         vscsi->client_data.mad_version = be32_to_cpu(info->mad_version);
1558         vscsi->client_data.os_type = be32_to_cpu(info->os_type);
1559
1560         /* Copy our info */
1561         strncpy(info->srp_version, SRP_VERSION,
1562                 sizeof(info->srp_version));
1563         strncpy(info->partition_name, vscsi->dds.partition_name,
1564                 sizeof(info->partition_name));
1565         info->partition_number = cpu_to_be32(vscsi->dds.partition_num);
1566         info->mad_version = cpu_to_be32(MAD_VERSION_1);
1567         info->os_type = cpu_to_be32(LINUX);
1568         memset(&info->port_max_txu[0], 0, sizeof(info->port_max_txu));
1569         info->port_max_txu[0] = cpu_to_be32(MAX_TXU);
1570
1571         dma_wmb();
1572         rc = h_copy_rdma(sizeof(*info), vscsi->dds.window[LOCAL].liobn,
1573                          token, vscsi->dds.window[REMOTE].liobn,
1574                          be64_to_cpu(mad->buffer));
1575         switch (rc) {
1576         case H_SUCCESS:
1577                 break;
1578
1579         case H_SOURCE_PARM:
1580         case H_DEST_PARM:
1581         case H_PERMISSION:
1582                 if (connection_broken(vscsi))
1583                         flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED);
1584                 fallthrough;
1585         default:
1586                 dev_err(&vscsi->dev, "adapter_info: h_copy_rdma to client failed, rc %ld\n",
1587                         rc);
1588                 ibmvscsis_post_disconnect(vscsi,
1589                                           ERR_DISCONNECT_RECONNECT,
1590                                           flag_bits);
1591                 break;
1592         }
1593
1594 free_dma:
1595         dma_free_coherent(&vscsi->dma_dev->dev, sizeof(*info), info, token);
1596         dev_dbg(&vscsi->dev, "Leaving adapter_info, rc %ld\n", rc);
1597
1598         return rc;
1599 }
1600
1601 /**
1602  * ibmvscsis_cap_mad() - Service a Capabilities MAnagement Data gram
1603  * @vscsi:      Pointer to our adapter structure
1604  * @iue:        Information Unit containing the Capabilities MAD request
1605  *
1606  * NOTE: if you return an error from this routine you must be
1607  * disconnecting or you will cause a hang
1608  *
1609  * EXECUTION ENVIRONMENT:
1610  *      Interrupt called with adapter lock held
1611  */
1612 static int ibmvscsis_cap_mad(struct scsi_info *vscsi, struct iu_entry *iue)
1613 {
1614         struct viosrp_capabilities *mad = &vio_iu(iue)->mad.capabilities;
1615         struct capabilities *cap;
1616         struct mad_capability_common *common;
1617         dma_addr_t token;
1618         u16 olen, len, status, min_len, cap_len;
1619         u32 flag;
1620         uint flag_bits = 0;
1621         long rc = 0;
1622
1623         olen = be16_to_cpu(mad->common.length);
1624         /*
1625          * struct capabilities hardcodes a couple capabilities after the
1626          * header, but the capabilities can actually be in any order.
1627          */
1628         min_len = offsetof(struct capabilities, migration);
1629         if ((olen < min_len) || (olen > PAGE_SIZE)) {
1630                 dev_warn(&vscsi->dev, "cap_mad: invalid len %d\n", olen);
1631                 mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
1632                 return 0;
1633         }
1634
1635         cap = dma_alloc_coherent(&vscsi->dma_dev->dev, olen, &token,
1636                                  GFP_ATOMIC);
1637         if (!cap) {
1638                 dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n",
1639                         iue->target);
1640                 mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED);
1641                 return 0;
1642         }
1643         rc = h_copy_rdma(olen, vscsi->dds.window[REMOTE].liobn,
1644                          be64_to_cpu(mad->buffer),
1645                          vscsi->dds.window[LOCAL].liobn, token);
1646         if (rc == H_SUCCESS) {
1647                 strncpy(cap->name, dev_name(&vscsi->dma_dev->dev),
1648                         SRP_MAX_LOC_LEN);
1649
1650                 len = olen - min_len;
1651                 status = VIOSRP_MAD_SUCCESS;
1652                 common = (struct mad_capability_common *)&cap->migration;
1653
1654                 while ((len > 0) && (status == VIOSRP_MAD_SUCCESS) && !rc) {
1655                         dev_dbg(&vscsi->dev, "cap_mad: len left %hd, cap type %d, cap len %hd\n",
1656                                 len, be32_to_cpu(common->cap_type),
1657                                 be16_to_cpu(common->length));
1658
1659                         cap_len = be16_to_cpu(common->length);
1660                         if (cap_len > len) {
1661                                 dev_err(&vscsi->dev, "cap_mad: cap len mismatch with total len\n");
1662                                 status = VIOSRP_MAD_FAILED;
1663                                 break;
1664                         }
1665
1666                         if (cap_len == 0) {
1667                                 dev_err(&vscsi->dev, "cap_mad: cap len is 0\n");
1668                                 status = VIOSRP_MAD_FAILED;
1669                                 break;
1670                         }
1671
1672                         switch (common->cap_type) {
1673                         default:
1674                                 dev_dbg(&vscsi->dev, "cap_mad: unsupported capability\n");
1675                                 common->server_support = 0;
1676                                 flag = cpu_to_be32((u32)CAP_LIST_SUPPORTED);
1677                                 cap->flags &= ~flag;
1678                                 break;
1679                         }
1680
1681                         len = len - cap_len;
1682                         common = (struct mad_capability_common *)
1683                                 ((char *)common + cap_len);
1684                 }
1685
1686                 mad->common.status = cpu_to_be16(status);
1687
1688                 dma_wmb();
1689                 rc = h_copy_rdma(olen, vscsi->dds.window[LOCAL].liobn, token,
1690                                  vscsi->dds.window[REMOTE].liobn,
1691                                  be64_to_cpu(mad->buffer));
1692
1693                 if (rc != H_SUCCESS) {
1694                         dev_dbg(&vscsi->dev, "cap_mad: failed to copy to client, rc %ld\n",
1695                                 rc);
1696
1697                         if (rc == H_PERMISSION) {
1698                                 if (connection_broken(vscsi))
1699                                         flag_bits = (RESPONSE_Q_DOWN |
1700                                                      CLIENT_FAILED);
1701                         }
1702
1703                         dev_warn(&vscsi->dev, "cap_mad: error copying data to client, rc %ld\n",
1704                                  rc);
1705                         ibmvscsis_post_disconnect(vscsi,
1706                                                   ERR_DISCONNECT_RECONNECT,
1707                                                   flag_bits);
1708                 }
1709         }
1710
1711         dma_free_coherent(&vscsi->dma_dev->dev, olen, cap, token);
1712
1713         dev_dbg(&vscsi->dev, "Leaving cap_mad, rc %ld, client_cap 0x%x\n",
1714                 rc, vscsi->client_cap);
1715
1716         return rc;
1717 }
1718
1719 /**
1720  * ibmvscsis_process_mad() - Service a MAnagement Data gram
1721  * @vscsi:      Pointer to our adapter structure
1722  * @iue:        Information Unit containing the MAD request
1723  *
1724  * Must be called with interrupt lock held.
1725  */
1726 static long ibmvscsis_process_mad(struct scsi_info *vscsi, struct iu_entry *iue)
1727 {
1728         struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad;
1729         struct viosrp_empty_iu *empty;
1730         long rc = ADAPT_SUCCESS;
1731
1732         switch (be32_to_cpu(mad->type)) {
1733         case VIOSRP_EMPTY_IU_TYPE:
1734                 empty = &vio_iu(iue)->mad.empty_iu;
1735                 vscsi->empty_iu_id = be64_to_cpu(empty->buffer);
1736                 vscsi->empty_iu_tag = be64_to_cpu(empty->common.tag);
1737                 mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS);
1738                 break;
1739         case VIOSRP_ADAPTER_INFO_TYPE:
1740                 rc = ibmvscsis_adapter_info(vscsi, iue);
1741                 break;
1742         case VIOSRP_CAPABILITIES_TYPE:
1743                 rc = ibmvscsis_cap_mad(vscsi, iue);
1744                 break;
1745         case VIOSRP_ENABLE_FAST_FAIL:
1746                 if (vscsi->state == CONNECTED) {
1747                         vscsi->fast_fail = true;
1748                         mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS);
1749                 } else {
1750                         dev_warn(&vscsi->dev, "fast fail mad sent after login\n");
1751                         mad->status = cpu_to_be16(VIOSRP_MAD_FAILED);
1752                 }
1753                 break;
1754         default:
1755                 mad->status = cpu_to_be16(VIOSRP_MAD_NOT_SUPPORTED);
1756                 break;
1757         }
1758
1759         return rc;
1760 }
1761
1762 /**
1763  * srp_snd_msg_failed() - Handle an error when sending a response
1764  * @vscsi:      Pointer to our adapter structure
1765  * @rc:         The return code from the h_send_crq command
1766  *
1767  * Must be called with interrupt lock held.
1768  */
1769 static void srp_snd_msg_failed(struct scsi_info *vscsi, long rc)
1770 {
1771         ktime_t kt;
1772
1773         if (rc != H_DROPPED) {
1774                 ibmvscsis_free_cmd_qs(vscsi);
1775
1776                 if (rc == H_CLOSED)
1777                         vscsi->flags |= CLIENT_FAILED;
1778
1779                 /* don't flag the same problem multiple times */
1780                 if (!(vscsi->flags & RESPONSE_Q_DOWN)) {
1781                         vscsi->flags |= RESPONSE_Q_DOWN;
1782                         if (!(vscsi->state & (ERR_DISCONNECT |
1783                                               ERR_DISCONNECT_RECONNECT |
1784                                               ERR_DISCONNECTED | UNDEFINED))) {
1785                                 dev_err(&vscsi->dev, "snd_msg_failed: setting RESPONSE_Q_DOWN, state 0x%hx, flags 0x%x, rc %ld\n",
1786                                         vscsi->state, vscsi->flags, rc);
1787                         }
1788                         ibmvscsis_post_disconnect(vscsi,
1789                                                   ERR_DISCONNECT_RECONNECT, 0);
1790                 }
1791                 return;
1792         }
1793
1794         /*
1795          * The response queue is full.
1796          * If the server is processing SRP requests, i.e.
1797          * the client has successfully done an
1798          * SRP_LOGIN, then it will wait forever for room in
1799          * the queue.  However if the system admin
1800          * is attempting to unconfigure the server then one
1801          * or more children will be in a state where
1802          * they are being removed. So if there is even one
1803          * child being removed then the driver assumes
1804          * the system admin is attempting to break the
1805          * connection with the client and MAX_TIMER_POPS
1806          * is honored.
1807          */
1808         if ((vscsi->rsp_q_timer.timer_pops < MAX_TIMER_POPS) ||
1809             (vscsi->state == SRP_PROCESSING)) {
1810                 dev_dbg(&vscsi->dev, "snd_msg_failed: response queue full, flags 0x%x, timer started %d, pops %d\n",
1811                         vscsi->flags, (int)vscsi->rsp_q_timer.started,
1812                         vscsi->rsp_q_timer.timer_pops);
1813
1814                 /*
1815                  * Check if the timer is running; if it
1816                  * is not then start it up.
1817                  */
1818                 if (!vscsi->rsp_q_timer.started) {
1819                         if (vscsi->rsp_q_timer.timer_pops <
1820                             MAX_TIMER_POPS) {
1821                                 kt = WAIT_NANO_SECONDS;
1822                         } else {
1823                                 /*
1824                                  * slide the timeslice if the maximum
1825                                  * timer pops have already happened
1826                                  */
1827                                 kt = ktime_set(WAIT_SECONDS, 0);
1828                         }
1829
1830                         vscsi->rsp_q_timer.started = true;
1831                         hrtimer_start(&vscsi->rsp_q_timer.timer, kt,
1832                                       HRTIMER_MODE_REL);
1833                 }
1834         } else {
1835                 /*
1836                  * TBD: Do we need to worry about this? Need to get
1837                  *      remove working.
1838                  */
1839                 /*
1840                  * waited a long time and it appears the system admin
1841                  * is bring this driver down
1842                  */
1843                 vscsi->flags |= RESPONSE_Q_DOWN;
1844                 ibmvscsis_free_cmd_qs(vscsi);
1845                 /*
1846                  * if the driver is already attempting to disconnect
1847                  * from the client and has already logged an error
1848                  * trace this event but don't put it in the error log
1849                  */
1850                 if (!(vscsi->state & (ERR_DISCONNECT |
1851                                       ERR_DISCONNECT_RECONNECT |
1852                                       ERR_DISCONNECTED | UNDEFINED))) {
1853                         dev_err(&vscsi->dev, "client crq full too long\n");
1854                         ibmvscsis_post_disconnect(vscsi,
1855                                                   ERR_DISCONNECT_RECONNECT,
1856                                                   0);
1857                 }
1858         }
1859 }
1860
1861 /**
1862  * ibmvscsis_send_messages() - Send a Response
1863  * @vscsi:      Pointer to our adapter structure
1864  *
1865  * Send a response, first checking the waiting queue. Responses are
1866  * sent in order they are received. If the response cannot be sent,
1867  * because the client queue is full, it stays on the waiting queue.
1868  *
1869  * PRECONDITION:
1870  *      Called with interrupt lock held
1871  */
1872 static void ibmvscsis_send_messages(struct scsi_info *vscsi)
1873 {
1874         u64 msg_hi = 0;
1875         /* note do not attempt to access the IU_data_ptr with this pointer
1876          * it is not valid
1877          */
1878         struct viosrp_crq *crq = (struct viosrp_crq *)&msg_hi;
1879         struct ibmvscsis_cmd *cmd, *nxt;
1880         long rc = ADAPT_SUCCESS;
1881         bool retry = false;
1882
1883         if (!(vscsi->flags & RESPONSE_Q_DOWN)) {
1884                 do {
1885                         retry = false;
1886                         list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp,
1887                                                  list) {
1888                                 /*
1889                                  * Check to make sure abort cmd gets processed
1890                                  * prior to the abort tmr cmd
1891                                  */
1892                                 if (cmd->flags & DELAY_SEND)
1893                                         continue;
1894
1895                                 if (cmd->abort_cmd) {
1896                                         retry = true;
1897                                         cmd->abort_cmd->flags &= ~(DELAY_SEND);
1898                                         cmd->abort_cmd = NULL;
1899                                 }
1900
1901                                 /*
1902                                  * If CMD_T_ABORTED w/o CMD_T_TAS scenarios and
1903                                  * the case where LIO issued a
1904                                  * ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST
1905                                  * case then we dont send a response, since it
1906                                  * was already done.
1907                                  */
1908                                 if (cmd->se_cmd.transport_state & CMD_T_ABORTED &&
1909                                     !(cmd->se_cmd.transport_state & CMD_T_TAS)) {
1910                                         list_del(&cmd->list);
1911                                         ibmvscsis_free_cmd_resources(vscsi,
1912                                                                      cmd);
1913                                         /*
1914                                          * With a successfully aborted op
1915                                          * through LIO we want to increment the
1916                                          * the vscsi credit so that when we dont
1917                                          * send a rsp to the original scsi abort
1918                                          * op (h_send_crq), but the tm rsp to
1919                                          * the abort is sent, the credit is
1920                                          * correctly sent with the abort tm rsp.
1921                                          * We would need 1 for the abort tm rsp
1922                                          * and 1 credit for the aborted scsi op.
1923                                          * Thus we need to increment here.
1924                                          * Also we want to increment the credit
1925                                          * here because we want to make sure
1926                                          * cmd is actually released first
1927                                          * otherwise the client will think it
1928                                          * it can send a new cmd, and we could
1929                                          * find ourselves short of cmd elements.
1930                                          */
1931                                         vscsi->credit += 1;
1932                                 } else {
1933                                         crq->valid = VALID_CMD_RESP_EL;
1934                                         crq->format = cmd->rsp.format;
1935
1936                                         if (cmd->flags & CMD_FAST_FAIL)
1937                                                 crq->status = VIOSRP_ADAPTER_FAIL;
1938
1939                                         crq->IU_length = cpu_to_be16(cmd->rsp.len);
1940
1941                                         rc = h_send_crq(vscsi->dma_dev->unit_address,
1942                                                         be64_to_cpu(msg_hi),
1943                                                         be64_to_cpu(cmd->rsp.tag));
1944
1945                                         dev_dbg(&vscsi->dev, "send_messages: cmd %p, tag 0x%llx, rc %ld\n",
1946                                                 cmd, be64_to_cpu(cmd->rsp.tag),
1947                                                 rc);
1948
1949                                         /* if all ok free up the command
1950                                          * element resources
1951                                          */
1952                                         if (rc == H_SUCCESS) {
1953                                                 /* some movement has occurred */
1954                                                 vscsi->rsp_q_timer.timer_pops = 0;
1955                                                 list_del(&cmd->list);
1956
1957                                                 ibmvscsis_free_cmd_resources(vscsi,
1958                                                                              cmd);
1959                                         } else {
1960                                                 srp_snd_msg_failed(vscsi, rc);
1961                                                 break;
1962                                         }
1963                                 }
1964                         }
1965                 } while (retry);
1966
1967                 if (!rc) {
1968                         /*
1969                          * The timer could pop with the queue empty.  If
1970                          * this happens, rc will always indicate a
1971                          * success; clear the pop count.
1972                          */
1973                         vscsi->rsp_q_timer.timer_pops = 0;
1974                 }
1975         } else {
1976                 ibmvscsis_free_cmd_qs(vscsi);
1977         }
1978 }
1979
1980 /* Called with intr lock held */
1981 static void ibmvscsis_send_mad_resp(struct scsi_info *vscsi,
1982                                     struct ibmvscsis_cmd *cmd,
1983                                     struct viosrp_crq *crq)
1984 {
1985         struct iu_entry *iue = cmd->iue;
1986         struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad;
1987         uint flag_bits = 0;
1988         long rc;
1989
1990         dma_wmb();
1991         rc = h_copy_rdma(sizeof(struct mad_common),
1992                          vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma,
1993                          vscsi->dds.window[REMOTE].liobn,
1994                          be64_to_cpu(crq->IU_data_ptr));
1995         if (!rc) {
1996                 cmd->rsp.format = VIOSRP_MAD_FORMAT;
1997                 cmd->rsp.len = sizeof(struct mad_common);
1998                 cmd->rsp.tag = mad->tag;
1999                 list_add_tail(&cmd->list, &vscsi->waiting_rsp);
2000                 ibmvscsis_send_messages(vscsi);
2001         } else {
2002                 dev_dbg(&vscsi->dev, "Error sending mad response, rc %ld\n",
2003                         rc);
2004                 if (rc == H_PERMISSION) {
2005                         if (connection_broken(vscsi))
2006                                 flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED);
2007                 }
2008                 dev_err(&vscsi->dev, "mad: failed to copy to client, rc %ld\n",
2009                         rc);
2010
2011                 ibmvscsis_free_cmd_resources(vscsi, cmd);
2012                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
2013                                           flag_bits);
2014         }
2015 }
2016
2017 /**
2018  * ibmvscsis_mad() - Service a MAnagement Data gram.
2019  * @vscsi:      Pointer to our adapter structure
2020  * @crq:        Pointer to the CRQ entry containing the MAD request
2021  *
2022  * EXECUTION ENVIRONMENT:
2023  *      Interrupt, called with adapter lock held
2024  */
2025 static long ibmvscsis_mad(struct scsi_info *vscsi, struct viosrp_crq *crq)
2026 {
2027         struct iu_entry *iue;
2028         struct ibmvscsis_cmd *cmd;
2029         struct mad_common *mad;
2030         long rc = ADAPT_SUCCESS;
2031
2032         switch (vscsi->state) {
2033                 /*
2034                  * We have not exchanged Init Msgs yet, so this MAD was sent
2035                  * before the last Transport Event; client will not be
2036                  * expecting a response.
2037                  */
2038         case WAIT_CONNECTION:
2039                 dev_dbg(&vscsi->dev, "mad: in Wait Connection state, ignoring MAD, flags %d\n",
2040                         vscsi->flags);
2041                 return ADAPT_SUCCESS;
2042
2043         case SRP_PROCESSING:
2044         case CONNECTED:
2045                 break;
2046
2047                 /*
2048                  * We should never get here while we're in these states.
2049                  * Just log an error and get out.
2050                  */
2051         case UNCONFIGURING:
2052         case WAIT_IDLE:
2053         case ERR_DISCONNECT:
2054         case ERR_DISCONNECT_RECONNECT:
2055         default:
2056                 dev_err(&vscsi->dev, "mad: invalid adapter state %d for mad\n",
2057                         vscsi->state);
2058                 return ADAPT_SUCCESS;
2059         }
2060
2061         cmd = ibmvscsis_get_free_cmd(vscsi);
2062         if (!cmd) {
2063                 dev_err(&vscsi->dev, "mad: failed to get cmd, debit %d\n",
2064                         vscsi->debit);
2065                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2066                 return ERROR;
2067         }
2068         iue = cmd->iue;
2069         cmd->type = ADAPTER_MAD;
2070
2071         rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq);
2072         if (!rc) {
2073                 mad = (struct mad_common *)&vio_iu(iue)->mad;
2074
2075                 dev_dbg(&vscsi->dev, "mad: type %d\n", be32_to_cpu(mad->type));
2076
2077                 rc = ibmvscsis_process_mad(vscsi, iue);
2078
2079                 dev_dbg(&vscsi->dev, "mad: status %hd, rc %ld\n",
2080                         be16_to_cpu(mad->status), rc);
2081
2082                 if (!rc)
2083                         ibmvscsis_send_mad_resp(vscsi, cmd, crq);
2084         } else {
2085                 ibmvscsis_free_cmd_resources(vscsi, cmd);
2086         }
2087
2088         dev_dbg(&vscsi->dev, "Leaving mad, rc %ld\n", rc);
2089         return rc;
2090 }
2091
2092 /**
2093  * ibmvscsis_login_rsp() - Create/copy a login response notice to the client
2094  * @vscsi:      Pointer to our adapter structure
2095  * @cmd:        Pointer to the command for the SRP Login request
2096  *
2097  * EXECUTION ENVIRONMENT:
2098  *      Interrupt, interrupt lock held
2099  */
2100 static long ibmvscsis_login_rsp(struct scsi_info *vscsi,
2101                                 struct ibmvscsis_cmd *cmd)
2102 {
2103         struct iu_entry *iue = cmd->iue;
2104         struct srp_login_rsp *rsp = &vio_iu(iue)->srp.login_rsp;
2105         struct format_code *fmt;
2106         uint flag_bits = 0;
2107         long rc = ADAPT_SUCCESS;
2108
2109         memset(rsp, 0, sizeof(struct srp_login_rsp));
2110
2111         rsp->opcode = SRP_LOGIN_RSP;
2112         rsp->req_lim_delta = cpu_to_be32(vscsi->request_limit);
2113         rsp->tag = cmd->rsp.tag;
2114         rsp->max_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
2115         rsp->max_ti_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
2116         fmt = (struct format_code *)&rsp->buf_fmt;
2117         fmt->buffers = SUPPORTED_FORMATS;
2118         vscsi->credit = 0;
2119
2120         cmd->rsp.len = sizeof(struct srp_login_rsp);
2121
2122         dma_wmb();
2123         rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn,
2124                          iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn,
2125                          be64_to_cpu(iue->remote_token));
2126
2127         switch (rc) {
2128         case H_SUCCESS:
2129                 break;
2130
2131         case H_PERMISSION:
2132                 if (connection_broken(vscsi))
2133                         flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED;
2134                 dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n",
2135                         rc);
2136                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
2137                                           flag_bits);
2138                 break;
2139         case H_SOURCE_PARM:
2140         case H_DEST_PARM:
2141         default:
2142                 dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n",
2143                         rc);
2144                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2145                 break;
2146         }
2147
2148         return rc;
2149 }
2150
2151 /**
2152  * ibmvscsis_srp_login_rej() - Create/copy a login rejection notice to client
2153  * @vscsi:      Pointer to our adapter structure
2154  * @cmd:        Pointer to the command for the SRP Login request
2155  * @reason:     The reason the SRP Login is being rejected, per SRP protocol
2156  *
2157  * EXECUTION ENVIRONMENT:
2158  *      Interrupt, interrupt lock held
2159  */
2160 static long ibmvscsis_srp_login_rej(struct scsi_info *vscsi,
2161                                     struct ibmvscsis_cmd *cmd, u32 reason)
2162 {
2163         struct iu_entry *iue = cmd->iue;
2164         struct srp_login_rej *rej = &vio_iu(iue)->srp.login_rej;
2165         struct format_code *fmt;
2166         uint flag_bits = 0;
2167         long rc = ADAPT_SUCCESS;
2168
2169         memset(rej, 0, sizeof(*rej));
2170
2171         rej->opcode = SRP_LOGIN_REJ;
2172         rej->reason = cpu_to_be32(reason);
2173         rej->tag = cmd->rsp.tag;
2174         fmt = (struct format_code *)&rej->buf_fmt;
2175         fmt->buffers = SUPPORTED_FORMATS;
2176
2177         cmd->rsp.len = sizeof(*rej);
2178
2179         dma_wmb();
2180         rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn,
2181                          iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn,
2182                          be64_to_cpu(iue->remote_token));
2183
2184         switch (rc) {
2185         case H_SUCCESS:
2186                 break;
2187         case H_PERMISSION:
2188                 if (connection_broken(vscsi))
2189                         flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED;
2190                 dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n",
2191                         rc);
2192                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT,
2193                                           flag_bits);
2194                 break;
2195         case H_SOURCE_PARM:
2196         case H_DEST_PARM:
2197         default:
2198                 dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n",
2199                         rc);
2200                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2201                 break;
2202         }
2203
2204         return rc;
2205 }
2206
2207 static int ibmvscsis_make_nexus(struct ibmvscsis_tport *tport)
2208 {
2209         char *name = tport->tport_name;
2210         struct ibmvscsis_nexus *nexus;
2211         struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport);
2212         int rc;
2213
2214         if (tport->ibmv_nexus) {
2215                 dev_dbg(&vscsi->dev, "tport->ibmv_nexus already exists\n");
2216                 return 0;
2217         }
2218
2219         nexus = kzalloc(sizeof(*nexus), GFP_KERNEL);
2220         if (!nexus) {
2221                 dev_err(&vscsi->dev, "Unable to allocate struct ibmvscsis_nexus\n");
2222                 return -ENOMEM;
2223         }
2224
2225         nexus->se_sess = target_setup_session(&tport->se_tpg, 0, 0,
2226                                               TARGET_PROT_NORMAL, name, nexus,
2227                                               NULL);
2228         if (IS_ERR(nexus->se_sess)) {
2229                 rc = PTR_ERR(nexus->se_sess);
2230                 goto transport_init_fail;
2231         }
2232
2233         tport->ibmv_nexus = nexus;
2234
2235         return 0;
2236
2237 transport_init_fail:
2238         kfree(nexus);
2239         return rc;
2240 }
2241
2242 static int ibmvscsis_drop_nexus(struct ibmvscsis_tport *tport)
2243 {
2244         struct se_session *se_sess;
2245         struct ibmvscsis_nexus *nexus;
2246
2247         nexus = tport->ibmv_nexus;
2248         if (!nexus)
2249                 return -ENODEV;
2250
2251         se_sess = nexus->se_sess;
2252         if (!se_sess)
2253                 return -ENODEV;
2254
2255         /*
2256          * Release the SCSI I_T Nexus to the emulated ibmvscsis Target Port
2257          */
2258         target_remove_session(se_sess);
2259         tport->ibmv_nexus = NULL;
2260         kfree(nexus);
2261
2262         return 0;
2263 }
2264
2265 /**
2266  * ibmvscsis_srp_login() - Process an SRP Login Request
2267  * @vscsi:      Pointer to our adapter structure
2268  * @cmd:        Command element to use to process the SRP Login request
2269  * @crq:        Pointer to CRQ entry containing the SRP Login request
2270  *
2271  * EXECUTION ENVIRONMENT:
2272  *      Interrupt, called with interrupt lock held
2273  */
2274 static long ibmvscsis_srp_login(struct scsi_info *vscsi,
2275                                 struct ibmvscsis_cmd *cmd,
2276                                 struct viosrp_crq *crq)
2277 {
2278         struct iu_entry *iue = cmd->iue;
2279         struct srp_login_req *req = &vio_iu(iue)->srp.login_req;
2280         struct port_id {
2281                 __be64 id_extension;
2282                 __be64 io_guid;
2283         } *iport, *tport;
2284         struct format_code *fmt;
2285         u32 reason = 0x0;
2286         long rc = ADAPT_SUCCESS;
2287
2288         iport = (struct port_id *)req->initiator_port_id;
2289         tport = (struct port_id *)req->target_port_id;
2290         fmt = (struct format_code *)&req->req_buf_fmt;
2291         if (be32_to_cpu(req->req_it_iu_len) > SRP_MAX_IU_LEN)
2292                 reason = SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE;
2293         else if (be32_to_cpu(req->req_it_iu_len) < 64)
2294                 reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL;
2295         else if ((be64_to_cpu(iport->id_extension) > (MAX_NUM_PORTS - 1)) ||
2296                  (be64_to_cpu(tport->id_extension) > (MAX_NUM_PORTS - 1)))
2297                 reason = SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL;
2298         else if (req->req_flags & SRP_MULTICHAN_MULTI)
2299                 reason = SRP_LOGIN_REJ_MULTI_CHANNEL_UNSUPPORTED;
2300         else if (fmt->buffers & (~SUPPORTED_FORMATS))
2301                 reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT;
2302         else if ((fmt->buffers & SUPPORTED_FORMATS) == 0)
2303                 reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT;
2304
2305         if (vscsi->state == SRP_PROCESSING)
2306                 reason = SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED;
2307
2308         rc = ibmvscsis_make_nexus(&vscsi->tport);
2309         if (rc)
2310                 reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL;
2311
2312         cmd->rsp.format = VIOSRP_SRP_FORMAT;
2313         cmd->rsp.tag = req->tag;
2314
2315         dev_dbg(&vscsi->dev, "srp_login: reason 0x%x\n", reason);
2316
2317         if (reason)
2318                 rc = ibmvscsis_srp_login_rej(vscsi, cmd, reason);
2319         else
2320                 rc = ibmvscsis_login_rsp(vscsi, cmd);
2321
2322         if (!rc) {
2323                 if (!reason)
2324                         vscsi->state = SRP_PROCESSING;
2325
2326                 list_add_tail(&cmd->list, &vscsi->waiting_rsp);
2327                 ibmvscsis_send_messages(vscsi);
2328         } else {
2329                 ibmvscsis_free_cmd_resources(vscsi, cmd);
2330         }
2331
2332         dev_dbg(&vscsi->dev, "Leaving srp_login, rc %ld\n", rc);
2333         return rc;
2334 }
2335
2336 /**
2337  * ibmvscsis_srp_i_logout() - Helper Function to close I_T Nexus
2338  * @vscsi:      Pointer to our adapter structure
2339  * @cmd:        Command element to use to process the Implicit Logout request
2340  * @crq:        Pointer to CRQ entry containing the Implicit Logout request
2341  *
2342  * Do the logic to close the I_T nexus.  This function may not
2343  * behave to specification.
2344  *
2345  * EXECUTION ENVIRONMENT:
2346  *      Interrupt, interrupt lock held
2347  */
2348 static long ibmvscsis_srp_i_logout(struct scsi_info *vscsi,
2349                                    struct ibmvscsis_cmd *cmd,
2350                                    struct viosrp_crq *crq)
2351 {
2352         struct iu_entry *iue = cmd->iue;
2353         struct srp_i_logout *log_out = &vio_iu(iue)->srp.i_logout;
2354
2355         if ((vscsi->debit > 0) || !list_empty(&vscsi->schedule_q) ||
2356             !list_empty(&vscsi->waiting_rsp)) {
2357                 dev_err(&vscsi->dev, "i_logout: outstanding work\n");
2358                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
2359         } else {
2360                 cmd->rsp.format = SRP_FORMAT;
2361                 cmd->rsp.tag = log_out->tag;
2362                 cmd->rsp.len = sizeof(struct mad_common);
2363                 list_add_tail(&cmd->list, &vscsi->waiting_rsp);
2364                 ibmvscsis_send_messages(vscsi);
2365
2366                 ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, 0);
2367         }
2368
2369         return ADAPT_SUCCESS;
2370 }
2371
2372 /* Called with intr lock held */
2373 static void ibmvscsis_srp_cmd(struct scsi_info *vscsi, struct viosrp_crq *crq)
2374 {
2375         struct ibmvscsis_cmd *cmd;
2376         struct iu_entry *iue;
2377         struct srp_cmd *srp;
2378         struct srp_tsk_mgmt *tsk;
2379         long rc;
2380
2381         if (vscsi->request_limit - vscsi->debit <= 0) {
2382                 /* Client has exceeded request limit */
2383                 dev_err(&vscsi->dev, "Client exceeded the request limit (%d), debit %d\n",
2384                         vscsi->request_limit, vscsi->debit);
2385                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2386                 return;
2387         }
2388
2389         cmd = ibmvscsis_get_free_cmd(vscsi);
2390         if (!cmd) {
2391                 dev_err(&vscsi->dev, "srp_cmd failed to get cmd, debit %d\n",
2392                         vscsi->debit);
2393                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2394                 return;
2395         }
2396         iue = cmd->iue;
2397         srp = &vio_iu(iue)->srp.cmd;
2398
2399         rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq);
2400         if (rc) {
2401                 ibmvscsis_free_cmd_resources(vscsi, cmd);
2402                 return;
2403         }
2404
2405         if (vscsi->state == SRP_PROCESSING) {
2406                 switch (srp->opcode) {
2407                 case SRP_LOGIN_REQ:
2408                         rc = ibmvscsis_srp_login(vscsi, cmd, crq);
2409                         break;
2410
2411                 case SRP_TSK_MGMT:
2412                         tsk = &vio_iu(iue)->srp.tsk_mgmt;
2413                         dev_dbg(&vscsi->dev, "tsk_mgmt tag: %llu (0x%llx)\n",
2414                                 tsk->tag, tsk->tag);
2415                         cmd->rsp.tag = tsk->tag;
2416                         vscsi->debit += 1;
2417                         cmd->type = TASK_MANAGEMENT;
2418                         list_add_tail(&cmd->list, &vscsi->schedule_q);
2419                         queue_work(vscsi->work_q, &cmd->work);
2420                         break;
2421
2422                 case SRP_CMD:
2423                         dev_dbg(&vscsi->dev, "srp_cmd tag: %llu (0x%llx)\n",
2424                                 srp->tag, srp->tag);
2425                         cmd->rsp.tag = srp->tag;
2426                         vscsi->debit += 1;
2427                         cmd->type = SCSI_CDB;
2428                         /*
2429                          * We want to keep track of work waiting for
2430                          * the workqueue.
2431                          */
2432                         list_add_tail(&cmd->list, &vscsi->schedule_q);
2433                         queue_work(vscsi->work_q, &cmd->work);
2434                         break;
2435
2436                 case SRP_I_LOGOUT:
2437                         rc = ibmvscsis_srp_i_logout(vscsi, cmd, crq);
2438                         break;
2439
2440                 case SRP_CRED_RSP:
2441                 case SRP_AER_RSP:
2442                 default:
2443                         ibmvscsis_free_cmd_resources(vscsi, cmd);
2444                         dev_err(&vscsi->dev, "invalid srp cmd, opcode %d\n",
2445                                 (uint)srp->opcode);
2446                         ibmvscsis_post_disconnect(vscsi,
2447                                                   ERR_DISCONNECT_RECONNECT, 0);
2448                         break;
2449                 }
2450         } else if (srp->opcode == SRP_LOGIN_REQ && vscsi->state == CONNECTED) {
2451                 rc = ibmvscsis_srp_login(vscsi, cmd, crq);
2452         } else {
2453                 ibmvscsis_free_cmd_resources(vscsi, cmd);
2454                 dev_err(&vscsi->dev, "Invalid state %d to handle srp cmd\n",
2455                         vscsi->state);
2456                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2457         }
2458 }
2459
2460 /**
2461  * ibmvscsis_ping_response() - Respond to a ping request
2462  * @vscsi:      Pointer to our adapter structure
2463  *
2464  * Let the client know that the server is alive and waiting on
2465  * its native I/O stack.
2466  * If any type of error occurs from the call to queue a ping
2467  * response then the client is either not accepting or receiving
2468  * interrupts.  Disconnect with an error.
2469  *
2470  * EXECUTION ENVIRONMENT:
2471  *      Interrupt, interrupt lock held
2472  */
2473 static long ibmvscsis_ping_response(struct scsi_info *vscsi)
2474 {
2475         struct viosrp_crq *crq;
2476         u64 buffer[2] = { 0, 0 };
2477         long rc;
2478
2479         crq = (struct viosrp_crq *)&buffer;
2480         crq->valid = VALID_CMD_RESP_EL;
2481         crq->format = (u8)MESSAGE_IN_CRQ;
2482         crq->status = PING_RESPONSE;
2483
2484         rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]),
2485                         cpu_to_be64(buffer[MSG_LOW]));
2486
2487         switch (rc) {
2488         case H_SUCCESS:
2489                 break;
2490         case H_CLOSED:
2491                 vscsi->flags |= CLIENT_FAILED;
2492                 fallthrough;
2493         case H_DROPPED:
2494                 vscsi->flags |= RESPONSE_Q_DOWN;
2495                 fallthrough;
2496         case H_REMOTE_PARM:
2497                 dev_err(&vscsi->dev, "ping_response: h_send_crq failed, rc %ld\n",
2498                         rc);
2499                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2500                 break;
2501         default:
2502                 dev_err(&vscsi->dev, "ping_response: h_send_crq returned unknown rc %ld\n",
2503                         rc);
2504                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
2505                 break;
2506         }
2507
2508         return rc;
2509 }
2510
2511 /**
2512  * ibmvscsis_parse_command() - Parse an element taken from the cmd rsp queue.
2513  * @vscsi:      Pointer to our adapter structure
2514  * @crq:        Pointer to CRQ element containing the SRP request
2515  *
2516  * This function will return success if the command queue element is valid
2517  * and the srp iu or MAD request it pointed to was also valid.  That does
2518  * not mean that an error was not returned to the client.
2519  *
2520  * EXECUTION ENVIRONMENT:
2521  *      Interrupt, intr lock held
2522  */
2523 static long ibmvscsis_parse_command(struct scsi_info *vscsi,
2524                                     struct viosrp_crq *crq)
2525 {
2526         long rc = ADAPT_SUCCESS;
2527
2528         switch (crq->valid) {
2529         case VALID_CMD_RESP_EL:
2530                 switch (crq->format) {
2531                 case OS400_FORMAT:
2532                 case AIX_FORMAT:
2533                 case LINUX_FORMAT:
2534                 case MAD_FORMAT:
2535                         if (vscsi->flags & PROCESSING_MAD) {
2536                                 rc = ERROR;
2537                                 dev_err(&vscsi->dev, "parse_command: already processing mad\n");
2538                                 ibmvscsis_post_disconnect(vscsi,
2539                                                        ERR_DISCONNECT_RECONNECT,
2540                                                        0);
2541                         } else {
2542                                 vscsi->flags |= PROCESSING_MAD;
2543                                 rc = ibmvscsis_mad(vscsi, crq);
2544                         }
2545                         break;
2546
2547                 case SRP_FORMAT:
2548                         ibmvscsis_srp_cmd(vscsi, crq);
2549                         break;
2550
2551                 case MESSAGE_IN_CRQ:
2552                         if (crq->status == PING)
2553                                 ibmvscsis_ping_response(vscsi);
2554                         break;
2555
2556                 default:
2557                         dev_err(&vscsi->dev, "parse_command: invalid format %d\n",
2558                                 (uint)crq->format);
2559                         ibmvscsis_post_disconnect(vscsi,
2560                                                   ERR_DISCONNECT_RECONNECT, 0);
2561                         break;
2562                 }
2563                 break;
2564
2565         case VALID_TRANS_EVENT:
2566                 rc = ibmvscsis_trans_event(vscsi, crq);
2567                 break;
2568
2569         case VALID_INIT_MSG:
2570                 rc = ibmvscsis_init_msg(vscsi, crq);
2571                 break;
2572
2573         default:
2574                 dev_err(&vscsi->dev, "parse_command: invalid valid field %d\n",
2575                         (uint)crq->valid);
2576                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2577                 break;
2578         }
2579
2580         /*
2581          * Return only what the interrupt handler cares
2582          * about. Most errors we keep right on trucking.
2583          */
2584         rc = vscsi->flags & SCHEDULE_DISCONNECT;
2585
2586         return rc;
2587 }
2588
2589 static int read_dma_window(struct scsi_info *vscsi)
2590 {
2591         struct vio_dev *vdev = vscsi->dma_dev;
2592         const __be32 *dma_window;
2593         const __be32 *prop;
2594
2595         /* TODO Using of_parse_dma_window would be better, but it doesn't give
2596          * a way to read multiple windows without already knowing the size of
2597          * a window or the number of windows.
2598          */
2599         dma_window = (const __be32 *)vio_get_attribute(vdev,
2600                                                        "ibm,my-dma-window",
2601                                                        NULL);
2602         if (!dma_window) {
2603                 dev_err(&vscsi->dev, "Couldn't find ibm,my-dma-window property\n");
2604                 return -1;
2605         }
2606
2607         vscsi->dds.window[LOCAL].liobn = be32_to_cpu(*dma_window);
2608         dma_window++;
2609
2610         prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-address-cells",
2611                                                  NULL);
2612         if (!prop) {
2613                 dev_warn(&vscsi->dev, "Couldn't find ibm,#dma-address-cells property\n");
2614                 dma_window++;
2615         } else {
2616                 dma_window += be32_to_cpu(*prop);
2617         }
2618
2619         prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-size-cells",
2620                                                  NULL);
2621         if (!prop) {
2622                 dev_warn(&vscsi->dev, "Couldn't find ibm,#dma-size-cells property\n");
2623                 dma_window++;
2624         } else {
2625                 dma_window += be32_to_cpu(*prop);
2626         }
2627
2628         /* dma_window should point to the second window now */
2629         vscsi->dds.window[REMOTE].liobn = be32_to_cpu(*dma_window);
2630
2631         return 0;
2632 }
2633
2634 static struct ibmvscsis_tport *ibmvscsis_lookup_port(const char *name)
2635 {
2636         struct ibmvscsis_tport *tport = NULL;
2637         struct vio_dev *vdev;
2638         struct scsi_info *vscsi;
2639
2640         spin_lock_bh(&ibmvscsis_dev_lock);
2641         list_for_each_entry(vscsi, &ibmvscsis_dev_list, list) {
2642                 vdev = vscsi->dma_dev;
2643                 if (!strcmp(dev_name(&vdev->dev), name)) {
2644                         tport = &vscsi->tport;
2645                         break;
2646                 }
2647         }
2648         spin_unlock_bh(&ibmvscsis_dev_lock);
2649
2650         return tport;
2651 }
2652
2653 /**
2654  * ibmvscsis_parse_cmd() - Parse SRP Command
2655  * @vscsi:      Pointer to our adapter structure
2656  * @cmd:        Pointer to command element with SRP command
2657  *
2658  * Parse the srp command; if it is valid then submit it to tcm.
2659  * Note: The return code does not reflect the status of the SCSI CDB.
2660  *
2661  * EXECUTION ENVIRONMENT:
2662  *      Process level
2663  */
2664 static void ibmvscsis_parse_cmd(struct scsi_info *vscsi,
2665                                 struct ibmvscsis_cmd *cmd)
2666 {
2667         struct iu_entry *iue = cmd->iue;
2668         struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf;
2669         struct ibmvscsis_nexus *nexus;
2670         u64 data_len = 0;
2671         enum dma_data_direction dir;
2672         int attr = 0;
2673         int rc = 0;
2674
2675         nexus = vscsi->tport.ibmv_nexus;
2676         /*
2677          * additional length in bytes.  Note that the SRP spec says that
2678          * additional length is in 4-byte words, but technically the
2679          * additional length field is only the upper 6 bits of the byte.
2680          * The lower 2 bits are reserved.  If the lower 2 bits are 0 (as
2681          * all reserved fields should be), then interpreting the byte as
2682          * an int will yield the length in bytes.
2683          */
2684         if (srp->add_cdb_len & 0x03) {
2685                 dev_err(&vscsi->dev, "parse_cmd: reserved bits set in IU\n");
2686                 spin_lock_bh(&vscsi->intr_lock);
2687                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2688                 ibmvscsis_free_cmd_resources(vscsi, cmd);
2689                 spin_unlock_bh(&vscsi->intr_lock);
2690                 return;
2691         }
2692
2693         if (srp_get_desc_table(srp, &dir, &data_len)) {
2694                 dev_err(&vscsi->dev, "0x%llx: parsing SRP descriptor table failed.\n",
2695                         srp->tag);
2696                 goto fail;
2697         }
2698
2699         cmd->rsp.sol_not = srp->sol_not;
2700
2701         switch (srp->task_attr) {
2702         case SRP_SIMPLE_TASK:
2703                 attr = TCM_SIMPLE_TAG;
2704                 break;
2705         case SRP_ORDERED_TASK:
2706                 attr = TCM_ORDERED_TAG;
2707                 break;
2708         case SRP_HEAD_TASK:
2709                 attr = TCM_HEAD_TAG;
2710                 break;
2711         case SRP_ACA_TASK:
2712                 attr = TCM_ACA_TAG;
2713                 break;
2714         default:
2715                 dev_err(&vscsi->dev, "Invalid task attribute %d\n",
2716                         srp->task_attr);
2717                 goto fail;
2718         }
2719
2720         cmd->se_cmd.tag = be64_to_cpu(srp->tag);
2721
2722         spin_lock_bh(&vscsi->intr_lock);
2723         list_add_tail(&cmd->list, &vscsi->active_q);
2724         spin_unlock_bh(&vscsi->intr_lock);
2725
2726         srp->lun.scsi_lun[0] &= 0x3f;
2727
2728         rc = target_submit_cmd(&cmd->se_cmd, nexus->se_sess, srp->cdb,
2729                                cmd->sense_buf, scsilun_to_int(&srp->lun),
2730                                data_len, attr, dir, 0);
2731         if (rc) {
2732                 dev_err(&vscsi->dev, "target_submit_cmd failed, rc %d\n", rc);
2733                 spin_lock_bh(&vscsi->intr_lock);
2734                 list_del(&cmd->list);
2735                 ibmvscsis_free_cmd_resources(vscsi, cmd);
2736                 spin_unlock_bh(&vscsi->intr_lock);
2737                 goto fail;
2738         }
2739         return;
2740
2741 fail:
2742         spin_lock_bh(&vscsi->intr_lock);
2743         ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0);
2744         spin_unlock_bh(&vscsi->intr_lock);
2745 }
2746
2747 /**
2748  * ibmvscsis_parse_task() - Parse SRP Task Management Request
2749  * @vscsi:      Pointer to our adapter structure
2750  * @cmd:        Pointer to command element with SRP task management request
2751  *
2752  * Parse the srp task management request; if it is valid then submit it to tcm.
2753  * Note: The return code does not reflect the status of the task management
2754  * request.
2755  *
2756  * EXECUTION ENVIRONMENT:
2757  *      Processor level
2758  */
2759 static void ibmvscsis_parse_task(struct scsi_info *vscsi,
2760                                  struct ibmvscsis_cmd *cmd)
2761 {
2762         struct iu_entry *iue = cmd->iue;
2763         struct srp_tsk_mgmt *srp_tsk = &vio_iu(iue)->srp.tsk_mgmt;
2764         int tcm_type;
2765         u64 tag_to_abort = 0;
2766         int rc = 0;
2767         struct ibmvscsis_nexus *nexus;
2768
2769         nexus = vscsi->tport.ibmv_nexus;
2770
2771         cmd->rsp.sol_not = srp_tsk->sol_not;
2772
2773         switch (srp_tsk->tsk_mgmt_func) {
2774         case SRP_TSK_ABORT_TASK:
2775                 tcm_type = TMR_ABORT_TASK;
2776                 tag_to_abort = be64_to_cpu(srp_tsk->task_tag);
2777                 break;
2778         case SRP_TSK_ABORT_TASK_SET:
2779                 tcm_type = TMR_ABORT_TASK_SET;
2780                 break;
2781         case SRP_TSK_CLEAR_TASK_SET:
2782                 tcm_type = TMR_CLEAR_TASK_SET;
2783                 break;
2784         case SRP_TSK_LUN_RESET:
2785                 tcm_type = TMR_LUN_RESET;
2786                 break;
2787         case SRP_TSK_CLEAR_ACA:
2788                 tcm_type = TMR_CLEAR_ACA;
2789                 break;
2790         default:
2791                 dev_err(&vscsi->dev, "unknown task mgmt func %d\n",
2792                         srp_tsk->tsk_mgmt_func);
2793                 cmd->se_cmd.se_tmr_req->response =
2794                         TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2795                 rc = -1;
2796                 break;
2797         }
2798
2799         if (!rc) {
2800                 cmd->se_cmd.tag = be64_to_cpu(srp_tsk->tag);
2801
2802                 spin_lock_bh(&vscsi->intr_lock);
2803                 list_add_tail(&cmd->list, &vscsi->active_q);
2804                 spin_unlock_bh(&vscsi->intr_lock);
2805
2806                 srp_tsk->lun.scsi_lun[0] &= 0x3f;
2807
2808                 dev_dbg(&vscsi->dev, "calling submit_tmr, func %d\n",
2809                         srp_tsk->tsk_mgmt_func);
2810                 rc = target_submit_tmr(&cmd->se_cmd, nexus->se_sess, NULL,
2811                                        scsilun_to_int(&srp_tsk->lun), srp_tsk,
2812                                        tcm_type, GFP_KERNEL, tag_to_abort, 0);
2813                 if (rc) {
2814                         dev_err(&vscsi->dev, "target_submit_tmr failed, rc %d\n",
2815                                 rc);
2816                         spin_lock_bh(&vscsi->intr_lock);
2817                         list_del(&cmd->list);
2818                         spin_unlock_bh(&vscsi->intr_lock);
2819                         cmd->se_cmd.se_tmr_req->response =
2820                                 TMR_FUNCTION_REJECTED;
2821                 }
2822         }
2823
2824         if (rc)
2825                 transport_send_check_condition_and_sense(&cmd->se_cmd, 0, 0);
2826 }
2827
2828 static void ibmvscsis_scheduler(struct work_struct *work)
2829 {
2830         struct ibmvscsis_cmd *cmd = container_of(work, struct ibmvscsis_cmd,
2831                                                  work);
2832         struct scsi_info *vscsi = cmd->adapter;
2833
2834         spin_lock_bh(&vscsi->intr_lock);
2835
2836         /* Remove from schedule_q */
2837         list_del(&cmd->list);
2838
2839         /* Don't submit cmd if we're disconnecting */
2840         if (vscsi->flags & (SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED)) {
2841                 ibmvscsis_free_cmd_resources(vscsi, cmd);
2842
2843                 /* ibmvscsis_disconnect might be waiting for us */
2844                 if (list_empty(&vscsi->active_q) &&
2845                     list_empty(&vscsi->schedule_q) &&
2846                     (vscsi->flags & WAIT_FOR_IDLE)) {
2847                         vscsi->flags &= ~WAIT_FOR_IDLE;
2848                         complete(&vscsi->wait_idle);
2849                 }
2850
2851                 spin_unlock_bh(&vscsi->intr_lock);
2852                 return;
2853         }
2854
2855         spin_unlock_bh(&vscsi->intr_lock);
2856
2857         switch (cmd->type) {
2858         case SCSI_CDB:
2859                 ibmvscsis_parse_cmd(vscsi, cmd);
2860                 break;
2861         case TASK_MANAGEMENT:
2862                 ibmvscsis_parse_task(vscsi, cmd);
2863                 break;
2864         default:
2865                 dev_err(&vscsi->dev, "scheduler, invalid cmd type %d\n",
2866                         cmd->type);
2867                 spin_lock_bh(&vscsi->intr_lock);
2868                 ibmvscsis_free_cmd_resources(vscsi, cmd);
2869                 spin_unlock_bh(&vscsi->intr_lock);
2870                 break;
2871         }
2872 }
2873
2874 static int ibmvscsis_alloc_cmds(struct scsi_info *vscsi, int num)
2875 {
2876         struct ibmvscsis_cmd *cmd;
2877         int i;
2878
2879         INIT_LIST_HEAD(&vscsi->free_cmd);
2880         vscsi->cmd_pool = kcalloc(num, sizeof(struct ibmvscsis_cmd),
2881                                   GFP_KERNEL);
2882         if (!vscsi->cmd_pool)
2883                 return -ENOMEM;
2884
2885         for (i = 0, cmd = (struct ibmvscsis_cmd *)vscsi->cmd_pool; i < num;
2886              i++, cmd++) {
2887                 cmd->abort_cmd = NULL;
2888                 cmd->adapter = vscsi;
2889                 INIT_WORK(&cmd->work, ibmvscsis_scheduler);
2890                 list_add_tail(&cmd->list, &vscsi->free_cmd);
2891         }
2892
2893         return 0;
2894 }
2895
2896 static void ibmvscsis_free_cmds(struct scsi_info *vscsi)
2897 {
2898         kfree(vscsi->cmd_pool);
2899         vscsi->cmd_pool = NULL;
2900         INIT_LIST_HEAD(&vscsi->free_cmd);
2901 }
2902
2903 /**
2904  * ibmvscsis_service_wait_q() - Service Waiting Queue
2905  * @timer:      Pointer to timer which has expired
2906  *
2907  * This routine is called when the timer pops to service the waiting
2908  * queue. Elements on the queue have completed, their responses have been
2909  * copied to the client, but the client's response queue was full so
2910  * the queue message could not be sent. The routine grabs the proper locks
2911  * and calls send messages.
2912  *
2913  * EXECUTION ENVIRONMENT:
2914  *      called at interrupt level
2915  */
2916 static enum hrtimer_restart ibmvscsis_service_wait_q(struct hrtimer *timer)
2917 {
2918         struct timer_cb *p_timer = container_of(timer, struct timer_cb, timer);
2919         struct scsi_info *vscsi = container_of(p_timer, struct scsi_info,
2920                                                rsp_q_timer);
2921
2922         spin_lock_bh(&vscsi->intr_lock);
2923         p_timer->timer_pops += 1;
2924         p_timer->started = false;
2925         ibmvscsis_send_messages(vscsi);
2926         spin_unlock_bh(&vscsi->intr_lock);
2927
2928         return HRTIMER_NORESTART;
2929 }
2930
2931 static long ibmvscsis_alloctimer(struct scsi_info *vscsi)
2932 {
2933         struct timer_cb *p_timer;
2934
2935         p_timer = &vscsi->rsp_q_timer;
2936         hrtimer_init(&p_timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
2937
2938         p_timer->timer.function = ibmvscsis_service_wait_q;
2939         p_timer->started = false;
2940         p_timer->timer_pops = 0;
2941
2942         return ADAPT_SUCCESS;
2943 }
2944
2945 static void ibmvscsis_freetimer(struct scsi_info *vscsi)
2946 {
2947         struct timer_cb *p_timer;
2948
2949         p_timer = &vscsi->rsp_q_timer;
2950
2951         (void)hrtimer_cancel(&p_timer->timer);
2952
2953         p_timer->started = false;
2954         p_timer->timer_pops = 0;
2955 }
2956
2957 static irqreturn_t ibmvscsis_interrupt(int dummy, void *data)
2958 {
2959         struct scsi_info *vscsi = data;
2960
2961         vio_disable_interrupts(vscsi->dma_dev);
2962         tasklet_schedule(&vscsi->work_task);
2963
2964         return IRQ_HANDLED;
2965 }
2966
2967 /**
2968  * ibmvscsis_enable_change_state() - Set new state based on enabled status
2969  * @vscsi:      Pointer to our adapter structure
2970  *
2971  * This function determines our new state now that we are enabled.  This
2972  * may involve sending an Init Complete message to the client.
2973  *
2974  * Must be called with interrupt lock held.
2975  */
2976 static long ibmvscsis_enable_change_state(struct scsi_info *vscsi)
2977 {
2978         int bytes;
2979         long rc = ADAPT_SUCCESS;
2980
2981         bytes = vscsi->cmd_q.size * PAGE_SIZE;
2982         rc = h_reg_crq(vscsi->dds.unit_id, vscsi->cmd_q.crq_token, bytes);
2983         if (rc == H_CLOSED || rc == H_SUCCESS) {
2984                 vscsi->state = WAIT_CONNECTION;
2985                 rc = ibmvscsis_establish_new_q(vscsi);
2986         }
2987
2988         if (rc != ADAPT_SUCCESS) {
2989                 vscsi->state = ERR_DISCONNECTED;
2990                 vscsi->flags |= RESPONSE_Q_DOWN;
2991         }
2992
2993         return rc;
2994 }
2995
2996 /**
2997  * ibmvscsis_create_command_q() - Create Command Queue
2998  * @vscsi:      Pointer to our adapter structure
2999  * @num_cmds:   Currently unused.  In the future, may be used to determine
3000  *              the size of the CRQ.
3001  *
3002  * Allocates memory for command queue maps remote memory into an ioba
3003  * initializes the command response queue
3004  *
3005  * EXECUTION ENVIRONMENT:
3006  *      Process level only
3007  */
3008 static long ibmvscsis_create_command_q(struct scsi_info *vscsi, int num_cmds)
3009 {
3010         int pages;
3011         struct vio_dev *vdev = vscsi->dma_dev;
3012
3013         /* We might support multiple pages in the future, but just 1 for now */
3014         pages = 1;
3015
3016         vscsi->cmd_q.size = pages;
3017
3018         vscsi->cmd_q.base_addr =
3019                 (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
3020         if (!vscsi->cmd_q.base_addr)
3021                 return -ENOMEM;
3022
3023         vscsi->cmd_q.mask = ((uint)pages * CRQ_PER_PAGE) - 1;
3024
3025         vscsi->cmd_q.crq_token = dma_map_single(&vdev->dev,
3026                                                 vscsi->cmd_q.base_addr,
3027                                                 PAGE_SIZE, DMA_BIDIRECTIONAL);
3028         if (dma_mapping_error(&vdev->dev, vscsi->cmd_q.crq_token)) {
3029                 free_page((unsigned long)vscsi->cmd_q.base_addr);
3030                 return -ENOMEM;
3031         }
3032
3033         return 0;
3034 }
3035
3036 /**
3037  * ibmvscsis_destroy_command_q - Destroy Command Queue
3038  * @vscsi:      Pointer to our adapter structure
3039  *
3040  * Releases memory for command queue and unmaps mapped remote memory.
3041  *
3042  * EXECUTION ENVIRONMENT:
3043  *      Process level only
3044  */
3045 static void ibmvscsis_destroy_command_q(struct scsi_info *vscsi)
3046 {
3047         dma_unmap_single(&vscsi->dma_dev->dev, vscsi->cmd_q.crq_token,
3048                          PAGE_SIZE, DMA_BIDIRECTIONAL);
3049         free_page((unsigned long)vscsi->cmd_q.base_addr);
3050         vscsi->cmd_q.base_addr = NULL;
3051         vscsi->state = NO_QUEUE;
3052 }
3053
3054 static u8 ibmvscsis_fast_fail(struct scsi_info *vscsi,
3055                               struct ibmvscsis_cmd *cmd)
3056 {
3057         struct iu_entry *iue = cmd->iue;
3058         struct se_cmd *se_cmd = &cmd->se_cmd;
3059         struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf;
3060         struct scsi_sense_hdr sshdr;
3061         u8 rc = se_cmd->scsi_status;
3062
3063         if (vscsi->fast_fail && (READ_CMD(srp->cdb) || WRITE_CMD(srp->cdb)))
3064                 if (scsi_normalize_sense(se_cmd->sense_buffer,
3065                                          se_cmd->scsi_sense_length, &sshdr))
3066                         if (sshdr.sense_key == HARDWARE_ERROR &&
3067                             (se_cmd->residual_count == 0 ||
3068                              se_cmd->residual_count == se_cmd->data_length)) {
3069                                 rc = NO_SENSE;
3070                                 cmd->flags |= CMD_FAST_FAIL;
3071                         }
3072
3073         return rc;
3074 }
3075
3076 /**
3077  * srp_build_response() - Build an SRP response buffer
3078  * @vscsi:      Pointer to our adapter structure
3079  * @cmd:        Pointer to command for which to send the response
3080  * @len_p:      Where to return the length of the IU response sent.  This
3081  *              is needed to construct the CRQ response.
3082  *
3083  * Build the SRP response buffer and copy it to the client's memory space.
3084  */
3085 static long srp_build_response(struct scsi_info *vscsi,
3086                                struct ibmvscsis_cmd *cmd, uint *len_p)
3087 {
3088         struct iu_entry *iue = cmd->iue;
3089         struct se_cmd *se_cmd = &cmd->se_cmd;
3090         struct srp_rsp *rsp;
3091         uint len;
3092         u32 rsp_code;
3093         char *data;
3094         u32 *tsk_status;
3095         long rc = ADAPT_SUCCESS;
3096
3097         spin_lock_bh(&vscsi->intr_lock);
3098
3099         rsp = &vio_iu(iue)->srp.rsp;
3100         len = sizeof(*rsp);
3101         memset(rsp, 0, len);
3102         data = rsp->data;
3103
3104         rsp->opcode = SRP_RSP;
3105
3106         rsp->req_lim_delta = cpu_to_be32(1 + vscsi->credit);
3107         rsp->tag = cmd->rsp.tag;
3108         rsp->flags = 0;
3109
3110         if (cmd->type == SCSI_CDB) {
3111                 rsp->status = ibmvscsis_fast_fail(vscsi, cmd);
3112                 if (rsp->status) {
3113                         dev_dbg(&vscsi->dev, "build_resp: cmd %p, scsi status %d\n",
3114                                 cmd, (int)rsp->status);
3115                         ibmvscsis_determine_resid(se_cmd, rsp);
3116                         if (se_cmd->scsi_sense_length && se_cmd->sense_buffer) {
3117                                 rsp->sense_data_len =
3118                                         cpu_to_be32(se_cmd->scsi_sense_length);
3119                                 rsp->flags |= SRP_RSP_FLAG_SNSVALID;
3120                                 len += se_cmd->scsi_sense_length;
3121                                 memcpy(data, se_cmd->sense_buffer,
3122                                        se_cmd->scsi_sense_length);
3123                         }
3124                         rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
3125                                 UCSOLNT_RESP_SHIFT;
3126                 } else if (cmd->flags & CMD_FAST_FAIL) {
3127                         dev_dbg(&vscsi->dev, "build_resp: cmd %p, fast fail\n",
3128                                 cmd);
3129                         rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
3130                                 UCSOLNT_RESP_SHIFT;
3131                 } else {
3132                         rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >>
3133                                 SCSOLNT_RESP_SHIFT;
3134                 }
3135         } else {
3136                 /* this is task management */
3137                 rsp->status = 0;
3138                 rsp->resp_data_len = cpu_to_be32(4);
3139                 rsp->flags |= SRP_RSP_FLAG_RSPVALID;
3140
3141                 switch (se_cmd->se_tmr_req->response) {
3142                 case TMR_FUNCTION_COMPLETE:
3143                 case TMR_TASK_DOES_NOT_EXIST:
3144                         rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_COMPLETE;
3145                         rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >>
3146                                 SCSOLNT_RESP_SHIFT;
3147                         break;
3148                 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3149                 case TMR_LUN_DOES_NOT_EXIST:
3150                         rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_NOT_SUPPORTED;
3151                         rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
3152                                 UCSOLNT_RESP_SHIFT;
3153                         break;
3154                 case TMR_FUNCTION_FAILED:
3155                 case TMR_FUNCTION_REJECTED:
3156                 default:
3157                         rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_FAILED;
3158                         rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >>
3159                                 UCSOLNT_RESP_SHIFT;
3160                         break;
3161                 }
3162
3163                 tsk_status = (u32 *)data;
3164                 *tsk_status = cpu_to_be32(rsp_code);
3165                 data = (char *)(tsk_status + 1);
3166                 len += 4;
3167         }
3168
3169         dma_wmb();
3170         rc = h_copy_rdma(len, vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma,
3171                          vscsi->dds.window[REMOTE].liobn,
3172                          be64_to_cpu(iue->remote_token));
3173
3174         switch (rc) {
3175         case H_SUCCESS:
3176                 vscsi->credit = 0;
3177                 *len_p = len;
3178                 break;
3179         case H_PERMISSION:
3180                 if (connection_broken(vscsi))
3181                         vscsi->flags |= RESPONSE_Q_DOWN | CLIENT_FAILED;
3182
3183                 dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld, flags 0x%x, state 0x%hx\n",
3184                         rc, vscsi->flags, vscsi->state);
3185                 break;
3186         case H_SOURCE_PARM:
3187         case H_DEST_PARM:
3188         default:
3189                 dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld\n",
3190                         rc);
3191                 break;
3192         }
3193
3194         spin_unlock_bh(&vscsi->intr_lock);
3195
3196         return rc;
3197 }
3198
3199 static int ibmvscsis_rdma(struct ibmvscsis_cmd *cmd, struct scatterlist *sg,
3200                           int nsg, struct srp_direct_buf *md, int nmd,
3201                           enum dma_data_direction dir, unsigned int bytes)
3202 {
3203         struct iu_entry *iue = cmd->iue;
3204         struct srp_target *target = iue->target;
3205         struct scsi_info *vscsi = target->ldata;
3206         struct scatterlist *sgp;
3207         dma_addr_t client_ioba, server_ioba;
3208         ulong buf_len;
3209         ulong client_len, server_len;
3210         int md_idx;
3211         long tx_len;
3212         long rc = 0;
3213
3214         if (bytes == 0)
3215                 return 0;
3216
3217         sgp = sg;
3218         client_len = 0;
3219         server_len = 0;
3220         md_idx = 0;
3221         tx_len = bytes;
3222
3223         do {
3224                 if (client_len == 0) {
3225                         if (md_idx >= nmd) {
3226                                 dev_err(&vscsi->dev, "rdma: ran out of client memory descriptors\n");
3227                                 rc = -EIO;
3228                                 break;
3229                         }
3230                         client_ioba = be64_to_cpu(md[md_idx].va);
3231                         client_len = be32_to_cpu(md[md_idx].len);
3232                 }
3233                 if (server_len == 0) {
3234                         if (!sgp) {
3235                                 dev_err(&vscsi->dev, "rdma: ran out of scatter/gather list\n");
3236                                 rc = -EIO;
3237                                 break;
3238                         }
3239                         server_ioba = sg_dma_address(sgp);
3240                         server_len = sg_dma_len(sgp);
3241                 }
3242
3243                 buf_len = tx_len;
3244
3245                 if (buf_len > client_len)
3246                         buf_len = client_len;
3247
3248                 if (buf_len > server_len)
3249                         buf_len = server_len;
3250
3251                 if (buf_len > max_vdma_size)
3252                         buf_len = max_vdma_size;
3253
3254                 if (dir == DMA_TO_DEVICE) {
3255                         /* read from client */
3256                         rc = h_copy_rdma(buf_len,
3257                                          vscsi->dds.window[REMOTE].liobn,
3258                                          client_ioba,
3259                                          vscsi->dds.window[LOCAL].liobn,
3260                                          server_ioba);
3261                 } else {
3262                         /* The h_copy_rdma will cause phyp, running in another
3263                          * partition, to read memory, so we need to make sure
3264                          * the data has been written out, hence these syncs.
3265                          */
3266                         /* ensure that everything is in memory */
3267                         isync();
3268                         /* ensure that memory has been made visible */
3269                         dma_wmb();
3270                         rc = h_copy_rdma(buf_len,
3271                                          vscsi->dds.window[LOCAL].liobn,
3272                                          server_ioba,
3273                                          vscsi->dds.window[REMOTE].liobn,
3274                                          client_ioba);
3275                 }
3276                 switch (rc) {
3277                 case H_SUCCESS:
3278                         break;
3279                 case H_PERMISSION:
3280                 case H_SOURCE_PARM:
3281                 case H_DEST_PARM:
3282                         if (connection_broken(vscsi)) {
3283                                 spin_lock_bh(&vscsi->intr_lock);
3284                                 vscsi->flags |=
3285                                         (RESPONSE_Q_DOWN | CLIENT_FAILED);
3286                                 spin_unlock_bh(&vscsi->intr_lock);
3287                         }
3288                         dev_err(&vscsi->dev, "rdma: h_copy_rdma failed, rc %ld\n",
3289                                 rc);
3290                         break;
3291
3292                 default:
3293                         dev_err(&vscsi->dev, "rdma: unknown error %ld from h_copy_rdma\n",
3294                                 rc);
3295                         break;
3296                 }
3297
3298                 if (!rc) {
3299                         tx_len -= buf_len;
3300                         if (tx_len) {
3301                                 client_len -= buf_len;
3302                                 if (client_len == 0)
3303                                         md_idx++;
3304                                 else
3305                                         client_ioba += buf_len;
3306
3307                                 server_len -= buf_len;
3308                                 if (server_len == 0)
3309                                         sgp = sg_next(sgp);
3310                                 else
3311                                         server_ioba += buf_len;
3312                         } else {
3313                                 break;
3314                         }
3315                 }
3316         } while (!rc);
3317
3318         return rc;
3319 }
3320
3321 /**
3322  * ibmvscsis_handle_crq() - Handle CRQ
3323  * @data:       Pointer to our adapter structure
3324  *
3325  * Read the command elements from the command queue and copy the payloads
3326  * associated with the command elements to local memory and execute the
3327  * SRP requests.
3328  *
3329  * Note: this is an edge triggered interrupt. It can not be shared.
3330  */
3331 static void ibmvscsis_handle_crq(unsigned long data)
3332 {
3333         struct scsi_info *vscsi = (struct scsi_info *)data;
3334         struct viosrp_crq *crq;
3335         long rc;
3336         bool ack = true;
3337         volatile u8 valid;
3338
3339         spin_lock_bh(&vscsi->intr_lock);
3340
3341         dev_dbg(&vscsi->dev, "got interrupt\n");
3342
3343         /*
3344          * if we are in a path where we are waiting for all pending commands
3345          * to complete because we received a transport event and anything in
3346          * the command queue is for a new connection, do nothing
3347          */
3348         if (TARGET_STOP(vscsi)) {
3349                 vio_enable_interrupts(vscsi->dma_dev);
3350
3351                 dev_dbg(&vscsi->dev, "handle_crq, don't process: flags 0x%x, state 0x%hx\n",
3352                         vscsi->flags, vscsi->state);
3353                 spin_unlock_bh(&vscsi->intr_lock);
3354                 return;
3355         }
3356
3357         rc = vscsi->flags & SCHEDULE_DISCONNECT;
3358         crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
3359         valid = crq->valid;
3360         dma_rmb();
3361
3362         while (valid) {
3363                 /*
3364                  * These are edege triggered interrupts. After dropping out of
3365                  * the while loop, the code must check for work since an
3366                  * interrupt could be lost, and an elment be left on the queue,
3367                  * hence the label.
3368                  */
3369 cmd_work:
3370                 vscsi->cmd_q.index =
3371                         (vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask;
3372
3373                 if (!rc) {
3374                         rc = ibmvscsis_parse_command(vscsi, crq);
3375                 } else {
3376                         if ((uint)crq->valid == VALID_TRANS_EVENT) {
3377                                 /*
3378                                  * must service the transport layer events even
3379                                  * in an error state, dont break out until all
3380                                  * the consecutive transport events have been
3381                                  * processed
3382                                  */
3383                                 rc = ibmvscsis_trans_event(vscsi, crq);
3384                         } else if (vscsi->flags & TRANS_EVENT) {
3385                                 /*
3386                                  * if a transport event has occurred leave
3387                                  * everything but transport events on the queue
3388                                  *
3389                                  * need to decrement the queue index so we can
3390                                  * look at the element again
3391                                  */
3392                                 if (vscsi->cmd_q.index)
3393                                         vscsi->cmd_q.index -= 1;
3394                                 else
3395                                         /*
3396                                          * index is at 0 it just wrapped.
3397                                          * have it index last element in q
3398                                          */
3399                                         vscsi->cmd_q.index = vscsi->cmd_q.mask;
3400                                 break;
3401                         }
3402                 }
3403
3404                 crq->valid = INVALIDATE_CMD_RESP_EL;
3405
3406                 crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
3407                 valid = crq->valid;
3408                 dma_rmb();
3409         }
3410
3411         if (!rc) {
3412                 if (ack) {
3413                         vio_enable_interrupts(vscsi->dma_dev);
3414                         ack = false;
3415                         dev_dbg(&vscsi->dev, "handle_crq, reenabling interrupts\n");
3416                 }
3417                 valid = crq->valid;
3418                 dma_rmb();
3419                 if (valid)
3420                         goto cmd_work;
3421         } else {
3422                 dev_dbg(&vscsi->dev, "handle_crq, error: flags 0x%x, state 0x%hx, crq index 0x%x\n",
3423                         vscsi->flags, vscsi->state, vscsi->cmd_q.index);
3424         }
3425
3426         dev_dbg(&vscsi->dev, "Leaving handle_crq: schedule_q empty %d, flags 0x%x, state 0x%hx\n",
3427                 (int)list_empty(&vscsi->schedule_q), vscsi->flags,
3428                 vscsi->state);
3429
3430         spin_unlock_bh(&vscsi->intr_lock);
3431 }
3432
3433 static int ibmvscsis_probe(struct vio_dev *vdev,
3434                            const struct vio_device_id *id)
3435 {
3436         struct scsi_info *vscsi;
3437         int rc = 0;
3438         long hrc = 0;
3439         char wq_name[24];
3440
3441         vscsi = kzalloc(sizeof(*vscsi), GFP_KERNEL);
3442         if (!vscsi) {
3443                 rc = -ENOMEM;
3444                 dev_err(&vdev->dev, "probe: allocation of adapter failed\n");
3445                 return rc;
3446         }
3447
3448         vscsi->dma_dev = vdev;
3449         vscsi->dev = vdev->dev;
3450         INIT_LIST_HEAD(&vscsi->schedule_q);
3451         INIT_LIST_HEAD(&vscsi->waiting_rsp);
3452         INIT_LIST_HEAD(&vscsi->active_q);
3453
3454         snprintf(vscsi->tport.tport_name, IBMVSCSIS_NAMELEN, "%s",
3455                  dev_name(&vdev->dev));
3456
3457         dev_dbg(&vscsi->dev, "probe tport_name: %s\n", vscsi->tport.tport_name);
3458
3459         rc = read_dma_window(vscsi);
3460         if (rc)
3461                 goto free_adapter;
3462         dev_dbg(&vscsi->dev, "Probe: liobn 0x%x, riobn 0x%x\n",
3463                 vscsi->dds.window[LOCAL].liobn,
3464                 vscsi->dds.window[REMOTE].liobn);
3465
3466         snprintf(vscsi->eye, sizeof(vscsi->eye), "VSCSI %s", vdev->name);
3467
3468         vscsi->dds.unit_id = vdev->unit_address;
3469         strscpy(vscsi->dds.partition_name, partition_name,
3470                 sizeof(vscsi->dds.partition_name));
3471         vscsi->dds.partition_num = partition_number;
3472
3473         spin_lock_bh(&ibmvscsis_dev_lock);
3474         list_add_tail(&vscsi->list, &ibmvscsis_dev_list);
3475         spin_unlock_bh(&ibmvscsis_dev_lock);
3476
3477         /*
3478          * TBD: How do we determine # of cmds to request?  Do we know how
3479          * many "children" we have?
3480          */
3481         vscsi->request_limit = INITIAL_SRP_LIMIT;
3482         rc = srp_target_alloc(&vscsi->target, &vdev->dev, vscsi->request_limit,
3483                               SRP_MAX_IU_LEN);
3484         if (rc)
3485                 goto rem_list;
3486
3487         vscsi->target.ldata = vscsi;
3488
3489         rc = ibmvscsis_alloc_cmds(vscsi, vscsi->request_limit);
3490         if (rc) {
3491                 dev_err(&vscsi->dev, "alloc_cmds failed, rc %d, num %d\n",
3492                         rc, vscsi->request_limit);
3493                 goto free_target;
3494         }
3495
3496         /*
3497          * Note: the lock is used in freeing timers, so must initialize
3498          * first so that ordering in case of error is correct.
3499          */
3500         spin_lock_init(&vscsi->intr_lock);
3501
3502         rc = ibmvscsis_alloctimer(vscsi);
3503         if (rc) {
3504                 dev_err(&vscsi->dev, "probe: alloctimer failed, rc %d\n", rc);
3505                 goto free_cmds;
3506         }
3507
3508         rc = ibmvscsis_create_command_q(vscsi, 256);
3509         if (rc) {
3510                 dev_err(&vscsi->dev, "probe: create_command_q failed, rc %d\n",
3511                         rc);
3512                 goto free_timer;
3513         }
3514
3515         vscsi->map_buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
3516         if (!vscsi->map_buf) {
3517                 rc = -ENOMEM;
3518                 dev_err(&vscsi->dev, "probe: allocating cmd buffer failed\n");
3519                 goto destroy_queue;
3520         }
3521
3522         vscsi->map_ioba = dma_map_single(&vdev->dev, vscsi->map_buf, PAGE_SIZE,
3523                                          DMA_BIDIRECTIONAL);
3524         if (dma_mapping_error(&vdev->dev, vscsi->map_ioba)) {
3525                 rc = -ENOMEM;
3526                 dev_err(&vscsi->dev, "probe: error mapping command buffer\n");
3527                 goto free_buf;
3528         }
3529
3530         hrc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO,
3531                        (u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0,
3532                        0);
3533         if (hrc == H_SUCCESS)
3534                 vscsi->client_data.partition_number =
3535                         be64_to_cpu(*(u64 *)vscsi->map_buf);
3536         /*
3537          * We expect the VIOCTL to fail if we're configured as "any
3538          * client can connect" and the client isn't activated yet.
3539          * We'll make the call again when he sends an init msg.
3540          */
3541         dev_dbg(&vscsi->dev, "probe hrc %ld, client partition num %d\n",
3542                 hrc, vscsi->client_data.partition_number);
3543
3544         tasklet_init(&vscsi->work_task, ibmvscsis_handle_crq,
3545                      (unsigned long)vscsi);
3546
3547         init_completion(&vscsi->wait_idle);
3548         init_completion(&vscsi->unconfig);
3549
3550         snprintf(wq_name, 24, "ibmvscsis%s", dev_name(&vdev->dev));
3551         vscsi->work_q = create_workqueue(wq_name);
3552         if (!vscsi->work_q) {
3553                 rc = -ENOMEM;
3554                 dev_err(&vscsi->dev, "create_workqueue failed\n");
3555                 goto unmap_buf;
3556         }
3557
3558         rc = request_irq(vdev->irq, ibmvscsis_interrupt, 0, "ibmvscsis", vscsi);
3559         if (rc) {
3560                 rc = -EPERM;
3561                 dev_err(&vscsi->dev, "probe: request_irq failed, rc %d\n", rc);
3562                 goto destroy_WQ;
3563         }
3564
3565         vscsi->state = WAIT_ENABLED;
3566
3567         dev_set_drvdata(&vdev->dev, vscsi);
3568
3569         return 0;
3570
3571 destroy_WQ:
3572         destroy_workqueue(vscsi->work_q);
3573 unmap_buf:
3574         dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE,
3575                          DMA_BIDIRECTIONAL);
3576 free_buf:
3577         kfree(vscsi->map_buf);
3578 destroy_queue:
3579         tasklet_kill(&vscsi->work_task);
3580         ibmvscsis_unregister_command_q(vscsi);
3581         ibmvscsis_destroy_command_q(vscsi);
3582 free_timer:
3583         ibmvscsis_freetimer(vscsi);
3584 free_cmds:
3585         ibmvscsis_free_cmds(vscsi);
3586 free_target:
3587         srp_target_free(&vscsi->target);
3588 rem_list:
3589         spin_lock_bh(&ibmvscsis_dev_lock);
3590         list_del(&vscsi->list);
3591         spin_unlock_bh(&ibmvscsis_dev_lock);
3592 free_adapter:
3593         kfree(vscsi);
3594
3595         return rc;
3596 }
3597
3598 static int ibmvscsis_remove(struct vio_dev *vdev)
3599 {
3600         struct scsi_info *vscsi = dev_get_drvdata(&vdev->dev);
3601
3602         dev_dbg(&vscsi->dev, "remove (%s)\n", dev_name(&vscsi->dma_dev->dev));
3603
3604         spin_lock_bh(&vscsi->intr_lock);
3605         ibmvscsis_post_disconnect(vscsi, UNCONFIGURING, 0);
3606         vscsi->flags |= CFG_SLEEPING;
3607         spin_unlock_bh(&vscsi->intr_lock);
3608         wait_for_completion(&vscsi->unconfig);
3609
3610         vio_disable_interrupts(vdev);
3611         free_irq(vdev->irq, vscsi);
3612         destroy_workqueue(vscsi->work_q);
3613         dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE,
3614                          DMA_BIDIRECTIONAL);
3615         kfree(vscsi->map_buf);
3616         tasklet_kill(&vscsi->work_task);
3617         ibmvscsis_destroy_command_q(vscsi);
3618         ibmvscsis_freetimer(vscsi);
3619         ibmvscsis_free_cmds(vscsi);
3620         srp_target_free(&vscsi->target);
3621         spin_lock_bh(&ibmvscsis_dev_lock);
3622         list_del(&vscsi->list);
3623         spin_unlock_bh(&ibmvscsis_dev_lock);
3624         kfree(vscsi);
3625
3626         return 0;
3627 }
3628
3629 static ssize_t system_id_show(struct device *dev,
3630                               struct device_attribute *attr, char *buf)
3631 {
3632         return snprintf(buf, PAGE_SIZE, "%s\n", system_id);
3633 }
3634
3635 static ssize_t partition_number_show(struct device *dev,
3636                                      struct device_attribute *attr, char *buf)
3637 {
3638         return snprintf(buf, PAGE_SIZE, "%x\n", partition_number);
3639 }
3640
3641 static ssize_t unit_address_show(struct device *dev,
3642                                  struct device_attribute *attr, char *buf)
3643 {
3644         struct scsi_info *vscsi = container_of(dev, struct scsi_info, dev);
3645
3646         return snprintf(buf, PAGE_SIZE, "%x\n", vscsi->dma_dev->unit_address);
3647 }
3648
3649 static int ibmvscsis_get_system_info(void)
3650 {
3651         struct device_node *rootdn, *vdevdn;
3652         const char *id, *model, *name;
3653         const uint *num;
3654
3655         rootdn = of_find_node_by_path("/");
3656         if (!rootdn)
3657                 return -ENOENT;
3658
3659         model = of_get_property(rootdn, "model", NULL);
3660         id = of_get_property(rootdn, "system-id", NULL);
3661         if (model && id)
3662                 snprintf(system_id, sizeof(system_id), "%s-%s", model, id);
3663
3664         name = of_get_property(rootdn, "ibm,partition-name", NULL);
3665         if (name)
3666                 strncpy(partition_name, name, sizeof(partition_name));
3667
3668         num = of_get_property(rootdn, "ibm,partition-no", NULL);
3669         if (num)
3670                 partition_number = of_read_number(num, 1);
3671
3672         of_node_put(rootdn);
3673
3674         vdevdn = of_find_node_by_path("/vdevice");
3675         if (vdevdn) {
3676                 const uint *mvds;
3677
3678                 mvds = of_get_property(vdevdn, "ibm,max-virtual-dma-size",
3679                                        NULL);
3680                 if (mvds)
3681                         max_vdma_size = *mvds;
3682                 of_node_put(vdevdn);
3683         }
3684
3685         return 0;
3686 }
3687
3688 static char *ibmvscsis_get_fabric_wwn(struct se_portal_group *se_tpg)
3689 {
3690         struct ibmvscsis_tport *tport =
3691                 container_of(se_tpg, struct ibmvscsis_tport, se_tpg);
3692
3693         return tport->tport_name;
3694 }
3695
3696 static u16 ibmvscsis_get_tag(struct se_portal_group *se_tpg)
3697 {
3698         struct ibmvscsis_tport *tport =
3699                 container_of(se_tpg, struct ibmvscsis_tport, se_tpg);
3700
3701         return tport->tport_tpgt;
3702 }
3703
3704 static u32 ibmvscsis_get_default_depth(struct se_portal_group *se_tpg)
3705 {
3706         return 1;
3707 }
3708
3709 static int ibmvscsis_check_true(struct se_portal_group *se_tpg)
3710 {
3711         return 1;
3712 }
3713
3714 static int ibmvscsis_check_false(struct se_portal_group *se_tpg)
3715 {
3716         return 0;
3717 }
3718
3719 static u32 ibmvscsis_tpg_get_inst_index(struct se_portal_group *se_tpg)
3720 {
3721         return 1;
3722 }
3723
3724 static int ibmvscsis_check_stop_free(struct se_cmd *se_cmd)
3725 {
3726         return target_put_sess_cmd(se_cmd);
3727 }
3728
3729 static void ibmvscsis_release_cmd(struct se_cmd *se_cmd)
3730 {
3731         struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
3732                                                  se_cmd);
3733         struct scsi_info *vscsi = cmd->adapter;
3734
3735         spin_lock_bh(&vscsi->intr_lock);
3736         /* Remove from active_q */
3737         list_move_tail(&cmd->list, &vscsi->waiting_rsp);
3738         ibmvscsis_send_messages(vscsi);
3739         spin_unlock_bh(&vscsi->intr_lock);
3740 }
3741
3742 static u32 ibmvscsis_sess_get_index(struct se_session *se_sess)
3743 {
3744         return 0;
3745 }
3746
3747 static int ibmvscsis_write_pending(struct se_cmd *se_cmd)
3748 {
3749         struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
3750                                                  se_cmd);
3751         struct scsi_info *vscsi = cmd->adapter;
3752         struct iu_entry *iue = cmd->iue;
3753         int rc;
3754
3755         /*
3756          * If CLIENT_FAILED OR RESPONSE_Q_DOWN, then just return success
3757          * since LIO can't do anything about it, and we dont want to
3758          * attempt an srp_transfer_data.
3759          */
3760         if ((vscsi->flags & (CLIENT_FAILED | RESPONSE_Q_DOWN))) {
3761                 dev_err(&vscsi->dev, "write_pending failed since: %d\n",
3762                         vscsi->flags);
3763                 return -EIO;
3764
3765         }
3766
3767         rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma,
3768                                1, 1);
3769         if (rc) {
3770                 dev_err(&vscsi->dev, "srp_transfer_data() failed: %d\n", rc);
3771                 return -EIO;
3772         }
3773         /*
3774          * We now tell TCM to add this WRITE CDB directly into the TCM storage
3775          * object execution queue.
3776          */
3777         target_execute_cmd(se_cmd);
3778         return 0;
3779 }
3780
3781 static void ibmvscsis_set_default_node_attrs(struct se_node_acl *nacl)
3782 {
3783 }
3784
3785 static int ibmvscsis_get_cmd_state(struct se_cmd *se_cmd)
3786 {
3787         return 0;
3788 }
3789
3790 static int ibmvscsis_queue_data_in(struct se_cmd *se_cmd)
3791 {
3792         struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
3793                                                  se_cmd);
3794         struct iu_entry *iue = cmd->iue;
3795         struct scsi_info *vscsi = cmd->adapter;
3796         uint len = 0;
3797         int rc;
3798
3799         rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma, 1,
3800                                1);
3801         if (rc) {
3802                 dev_err(&vscsi->dev, "srp_transfer_data failed: %d\n", rc);
3803                 se_cmd->scsi_sense_length = 18;
3804                 memset(se_cmd->sense_buffer, 0, se_cmd->scsi_sense_length);
3805                 /* Logical Unit Communication Time-out asc/ascq = 0x0801 */
3806                 scsi_build_sense_buffer(0, se_cmd->sense_buffer, MEDIUM_ERROR,
3807                                         0x08, 0x01);
3808         }
3809
3810         srp_build_response(vscsi, cmd, &len);
3811         cmd->rsp.format = SRP_FORMAT;
3812         cmd->rsp.len = len;
3813
3814         return 0;
3815 }
3816
3817 static int ibmvscsis_queue_status(struct se_cmd *se_cmd)
3818 {
3819         struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
3820                                                  se_cmd);
3821         struct scsi_info *vscsi = cmd->adapter;
3822         uint len;
3823
3824         dev_dbg(&vscsi->dev, "queue_status %p\n", se_cmd);
3825
3826         srp_build_response(vscsi, cmd, &len);
3827         cmd->rsp.format = SRP_FORMAT;
3828         cmd->rsp.len = len;
3829
3830         return 0;
3831 }
3832
3833 static void ibmvscsis_queue_tm_rsp(struct se_cmd *se_cmd)
3834 {
3835         struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
3836                                                  se_cmd);
3837         struct scsi_info *vscsi = cmd->adapter;
3838         struct ibmvscsis_cmd *cmd_itr;
3839         struct iu_entry *iue = iue = cmd->iue;
3840         struct srp_tsk_mgmt *srp_tsk = &vio_iu(iue)->srp.tsk_mgmt;
3841         u64 tag_to_abort = be64_to_cpu(srp_tsk->task_tag);
3842         uint len;
3843
3844         dev_dbg(&vscsi->dev, "queue_tm_rsp %p, status %d\n",
3845                 se_cmd, (int)se_cmd->se_tmr_req->response);
3846
3847         if (srp_tsk->tsk_mgmt_func == SRP_TSK_ABORT_TASK &&
3848             cmd->se_cmd.se_tmr_req->response == TMR_TASK_DOES_NOT_EXIST) {
3849                 spin_lock_bh(&vscsi->intr_lock);
3850                 list_for_each_entry(cmd_itr, &vscsi->active_q, list) {
3851                         if (tag_to_abort == cmd_itr->se_cmd.tag) {
3852                                 cmd_itr->abort_cmd = cmd;
3853                                 cmd->flags |= DELAY_SEND;
3854                                 break;
3855                         }
3856                 }
3857                 spin_unlock_bh(&vscsi->intr_lock);
3858         }
3859
3860         srp_build_response(vscsi, cmd, &len);
3861         cmd->rsp.format = SRP_FORMAT;
3862         cmd->rsp.len = len;
3863 }
3864
3865 static void ibmvscsis_aborted_task(struct se_cmd *se_cmd)
3866 {
3867         struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
3868                                                  se_cmd);
3869         struct scsi_info *vscsi = cmd->adapter;
3870
3871         dev_dbg(&vscsi->dev, "ibmvscsis_aborted_task %p task_tag: %llu\n",
3872                 se_cmd, se_cmd->tag);
3873 }
3874
3875 static struct se_wwn *ibmvscsis_make_tport(struct target_fabric_configfs *tf,
3876                                            struct config_group *group,
3877                                            const char *name)
3878 {
3879         struct ibmvscsis_tport *tport;
3880         struct scsi_info *vscsi;
3881
3882         tport = ibmvscsis_lookup_port(name);
3883         if (tport) {
3884                 vscsi = container_of(tport, struct scsi_info, tport);
3885                 tport->tport_proto_id = SCSI_PROTOCOL_SRP;
3886                 dev_dbg(&vscsi->dev, "make_tport(%s), pointer:%p, tport_id:%x\n",
3887                         name, tport, tport->tport_proto_id);
3888                 return &tport->tport_wwn;
3889         }
3890
3891         return ERR_PTR(-EINVAL);
3892 }
3893
3894 static void ibmvscsis_drop_tport(struct se_wwn *wwn)
3895 {
3896         struct ibmvscsis_tport *tport = container_of(wwn,
3897                                                      struct ibmvscsis_tport,
3898                                                      tport_wwn);
3899         struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport);
3900
3901         dev_dbg(&vscsi->dev, "drop_tport(%s)\n",
3902                 config_item_name(&tport->tport_wwn.wwn_group.cg_item));
3903 }
3904
3905 static struct se_portal_group *ibmvscsis_make_tpg(struct se_wwn *wwn,
3906                                                   const char *name)
3907 {
3908         struct ibmvscsis_tport *tport =
3909                 container_of(wwn, struct ibmvscsis_tport, tport_wwn);
3910         u16 tpgt;
3911         int rc;
3912
3913         if (strstr(name, "tpgt_") != name)
3914                 return ERR_PTR(-EINVAL);
3915         rc = kstrtou16(name + 5, 0, &tpgt);
3916         if (rc)
3917                 return ERR_PTR(rc);
3918         tport->tport_tpgt = tpgt;
3919
3920         tport->releasing = false;
3921
3922         rc = core_tpg_register(&tport->tport_wwn, &tport->se_tpg,
3923                                tport->tport_proto_id);
3924         if (rc)
3925                 return ERR_PTR(rc);
3926
3927         return &tport->se_tpg;
3928 }
3929
3930 static void ibmvscsis_drop_tpg(struct se_portal_group *se_tpg)
3931 {
3932         struct ibmvscsis_tport *tport = container_of(se_tpg,
3933                                                      struct ibmvscsis_tport,
3934                                                      se_tpg);
3935
3936         tport->releasing = true;
3937         tport->enabled = false;
3938
3939         /*
3940          * Release the virtual I_T Nexus for this ibmvscsis TPG
3941          */
3942         ibmvscsis_drop_nexus(tport);
3943         /*
3944          * Deregister the se_tpg from TCM..
3945          */
3946         core_tpg_deregister(se_tpg);
3947 }
3948
3949 static ssize_t ibmvscsis_wwn_version_show(struct config_item *item,
3950                                           char *page)
3951 {
3952         return scnprintf(page, PAGE_SIZE, "%s\n", IBMVSCSIS_VERSION);
3953 }
3954 CONFIGFS_ATTR_RO(ibmvscsis_wwn_, version);
3955
3956 static struct configfs_attribute *ibmvscsis_wwn_attrs[] = {
3957         &ibmvscsis_wwn_attr_version,
3958         NULL,
3959 };
3960
3961 static ssize_t ibmvscsis_tpg_enable_show(struct config_item *item,
3962                                          char *page)
3963 {
3964         struct se_portal_group *se_tpg = to_tpg(item);
3965         struct ibmvscsis_tport *tport = container_of(se_tpg,
3966                                                      struct ibmvscsis_tport,
3967                                                      se_tpg);
3968
3969         return snprintf(page, PAGE_SIZE, "%d\n", (tport->enabled) ? 1 : 0);
3970 }
3971
3972 static ssize_t ibmvscsis_tpg_enable_store(struct config_item *item,
3973                                           const char *page, size_t count)
3974 {
3975         struct se_portal_group *se_tpg = to_tpg(item);
3976         struct ibmvscsis_tport *tport = container_of(se_tpg,
3977                                                      struct ibmvscsis_tport,
3978                                                      se_tpg);
3979         struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport);
3980         unsigned long tmp;
3981         int rc;
3982         long lrc;
3983
3984         rc = kstrtoul(page, 0, &tmp);
3985         if (rc < 0) {
3986                 dev_err(&vscsi->dev, "Unable to extract srpt_tpg_store_enable\n");
3987                 return -EINVAL;
3988         }
3989
3990         if ((tmp != 0) && (tmp != 1)) {
3991                 dev_err(&vscsi->dev, "Illegal value for srpt_tpg_store_enable\n");
3992                 return -EINVAL;
3993         }
3994
3995         if (tmp) {
3996                 spin_lock_bh(&vscsi->intr_lock);
3997                 tport->enabled = true;
3998                 lrc = ibmvscsis_enable_change_state(vscsi);
3999                 if (lrc)
4000                         dev_err(&vscsi->dev, "enable_change_state failed, rc %ld state %d\n",
4001                                 lrc, vscsi->state);
4002                 spin_unlock_bh(&vscsi->intr_lock);
4003         } else {
4004                 spin_lock_bh(&vscsi->intr_lock);
4005                 tport->enabled = false;
4006                 /* This simulates the server going down */
4007                 ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0);
4008                 spin_unlock_bh(&vscsi->intr_lock);
4009         }
4010
4011         dev_dbg(&vscsi->dev, "tpg_enable_store, tmp %ld, state %d\n", tmp,
4012                 vscsi->state);
4013
4014         return count;
4015 }
4016 CONFIGFS_ATTR(ibmvscsis_tpg_, enable);
4017
4018 static struct configfs_attribute *ibmvscsis_tpg_attrs[] = {
4019         &ibmvscsis_tpg_attr_enable,
4020         NULL,
4021 };
4022
4023 static const struct target_core_fabric_ops ibmvscsis_ops = {
4024         .module                         = THIS_MODULE,
4025         .fabric_name                    = "ibmvscsis",
4026         .max_data_sg_nents              = MAX_TXU / PAGE_SIZE,
4027         .tpg_get_wwn                    = ibmvscsis_get_fabric_wwn,
4028         .tpg_get_tag                    = ibmvscsis_get_tag,
4029         .tpg_get_default_depth          = ibmvscsis_get_default_depth,
4030         .tpg_check_demo_mode            = ibmvscsis_check_true,
4031         .tpg_check_demo_mode_cache      = ibmvscsis_check_true,
4032         .tpg_check_demo_mode_write_protect = ibmvscsis_check_false,
4033         .tpg_check_prod_mode_write_protect = ibmvscsis_check_false,
4034         .tpg_get_inst_index             = ibmvscsis_tpg_get_inst_index,
4035         .check_stop_free                = ibmvscsis_check_stop_free,
4036         .release_cmd                    = ibmvscsis_release_cmd,
4037         .sess_get_index                 = ibmvscsis_sess_get_index,
4038         .write_pending                  = ibmvscsis_write_pending,
4039         .set_default_node_attributes    = ibmvscsis_set_default_node_attrs,
4040         .get_cmd_state                  = ibmvscsis_get_cmd_state,
4041         .queue_data_in                  = ibmvscsis_queue_data_in,
4042         .queue_status                   = ibmvscsis_queue_status,
4043         .queue_tm_rsp                   = ibmvscsis_queue_tm_rsp,
4044         .aborted_task                   = ibmvscsis_aborted_task,
4045         /*
4046          * Setup function pointers for logic in target_core_fabric_configfs.c
4047          */
4048         .fabric_make_wwn                = ibmvscsis_make_tport,
4049         .fabric_drop_wwn                = ibmvscsis_drop_tport,
4050         .fabric_make_tpg                = ibmvscsis_make_tpg,
4051         .fabric_drop_tpg                = ibmvscsis_drop_tpg,
4052
4053         .tfc_wwn_attrs                  = ibmvscsis_wwn_attrs,
4054         .tfc_tpg_base_attrs             = ibmvscsis_tpg_attrs,
4055 };
4056
4057 static void ibmvscsis_dev_release(struct device *dev) {};
4058
4059 static struct device_attribute dev_attr_system_id =
4060         __ATTR(system_id, S_IRUGO, system_id_show, NULL);
4061
4062 static struct device_attribute dev_attr_partition_number =
4063         __ATTR(partition_number, S_IRUGO, partition_number_show, NULL);
4064
4065 static struct device_attribute dev_attr_unit_address =
4066         __ATTR(unit_address, S_IRUGO, unit_address_show, NULL);
4067
4068 static struct attribute *ibmvscsis_dev_attrs[] = {
4069         &dev_attr_system_id.attr,
4070         &dev_attr_partition_number.attr,
4071         &dev_attr_unit_address.attr,
4072 };
4073 ATTRIBUTE_GROUPS(ibmvscsis_dev);
4074
4075 static struct class ibmvscsis_class = {
4076         .name           = "ibmvscsis",
4077         .dev_release    = ibmvscsis_dev_release,
4078         .dev_groups     = ibmvscsis_dev_groups,
4079 };
4080
4081 static const struct vio_device_id ibmvscsis_device_table[] = {
4082         { "v-scsi-host", "IBM,v-scsi-host" },
4083         { "", "" }
4084 };
4085 MODULE_DEVICE_TABLE(vio, ibmvscsis_device_table);
4086
4087 static struct vio_driver ibmvscsis_driver = {
4088         .name = "ibmvscsis",
4089         .id_table = ibmvscsis_device_table,
4090         .probe = ibmvscsis_probe,
4091         .remove = ibmvscsis_remove,
4092 };
4093
4094 /*
4095  * ibmvscsis_init() - Kernel Module initialization
4096  *
4097  * Note: vio_register_driver() registers callback functions, and at least one
4098  * of those callback functions calls TCM - Linux IO Target Subsystem, thus
4099  * the SCSI Target template must be registered before vio_register_driver()
4100  * is called.
4101  */
4102 static int __init ibmvscsis_init(void)
4103 {
4104         int rc = 0;
4105
4106         rc = ibmvscsis_get_system_info();
4107         if (rc) {
4108                 pr_err("rc %d from get_system_info\n", rc);
4109                 goto out;
4110         }
4111
4112         rc = class_register(&ibmvscsis_class);
4113         if (rc) {
4114                 pr_err("failed class register\n");
4115                 goto out;
4116         }
4117
4118         rc = target_register_template(&ibmvscsis_ops);
4119         if (rc) {
4120                 pr_err("rc %d from target_register_template\n", rc);
4121                 goto unregister_class;
4122         }
4123
4124         rc = vio_register_driver(&ibmvscsis_driver);
4125         if (rc) {
4126                 pr_err("rc %d from vio_register_driver\n", rc);
4127                 goto unregister_target;
4128         }
4129
4130         return 0;
4131
4132 unregister_target:
4133         target_unregister_template(&ibmvscsis_ops);
4134 unregister_class:
4135         class_unregister(&ibmvscsis_class);
4136 out:
4137         return rc;
4138 }
4139
4140 static void __exit ibmvscsis_exit(void)
4141 {
4142         pr_info("Unregister IBM virtual SCSI host driver\n");
4143         vio_unregister_driver(&ibmvscsis_driver);
4144         target_unregister_template(&ibmvscsis_ops);
4145         class_unregister(&ibmvscsis_class);
4146 }
4147
4148 MODULE_DESCRIPTION("IBMVSCSIS fabric driver");
4149 MODULE_AUTHOR("Bryant G. Ly and Michael Cyr");
4150 MODULE_LICENSE("GPL");
4151 MODULE_VERSION(IBMVSCSIS_VERSION);
4152 module_init(ibmvscsis_init);
4153 module_exit(ibmvscsis_exit);