drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c

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