Pileus Git - ~andy/linux/blob - drivers/scsi/qla4xxx/ql4_os.c

   1 /*
   2  * QLogic iSCSI HBA Driver
   3  * Copyright (c)  2003-2006 QLogic Corporation
   4  *
   5  * See LICENSE.qla4xxx for copyright and licensing details.
   6  */
   7 #include <linux/moduleparam.h>
   8
   9 #include <scsi/scsi_tcq.h>
  10 #include <scsi/scsicam.h>
  11
  12 #include "ql4_def.h"
  13 #include "ql4_version.h"
  14 #include "ql4_glbl.h"
  15 #include "ql4_dbg.h"
  16 #include "ql4_inline.h"
  17
  18 /*
  19  * Driver version
  20  */
  21 static char qla4xxx_version_str[40];
  22
  23 /*
  24  * SRB allocation cache
  25  */
  26 static struct kmem_cache *srb_cachep;
  27
  28 /*
  29  * Module parameter information and variables
  30  */
  31 int ql4xdiscoverywait = 60;
  32 module_param(ql4xdiscoverywait, int, S_IRUGO | S_IRUSR);
  33 MODULE_PARM_DESC(ql4xdiscoverywait, "Discovery wait time");
  34 int ql4xdontresethba = 0;
  35 module_param(ql4xdontresethba, int, S_IRUGO | S_IRUSR);
  36 MODULE_PARM_DESC(ql4xdontresethba,
  37                  "Dont reset the HBA when the driver gets 0x8002 AEN "
  38                  " default it will reset hba :0"
  39                  " set to 1 to avoid resetting HBA");
  40
  41 int ql4xextended_error_logging = 0; /* 0 = off, 1 = log errors */
  42 module_param(ql4xextended_error_logging, int, S_IRUGO | S_IRUSR);
  43 MODULE_PARM_DESC(ql4xextended_error_logging,
  44                  "Option to enable extended error logging, "
  45                  "Default is 0 - no logging, 1 - debug logging");
  46
  47 int ql4_mod_unload = 0;
  48
  49 /*
  50  * SCSI host template entry points
  51  */
  52 static void qla4xxx_config_dma_addressing(struct scsi_qla_host *ha);
  53
  54 /*
  55  * iSCSI template entry points
  56  */
  57 static int qla4xxx_tgt_dscvr(enum iscsi_tgt_dscvr type, uint32_t host_no,
  58                              uint32_t enable, struct sockaddr *dst_addr);
  59 static int qla4xxx_conn_get_param(struct iscsi_cls_conn *conn,
  60                                   enum iscsi_param param, char *buf);
  61 static int qla4xxx_sess_get_param(struct iscsi_cls_session *sess,
  62                                   enum iscsi_param param, char *buf);
  63 static void qla4xxx_conn_stop(struct iscsi_cls_conn *conn, int flag);
  64 static int qla4xxx_conn_start(struct iscsi_cls_conn *conn);
  65 static void qla4xxx_recovery_timedout(struct iscsi_cls_session *session);
  66
  67 /*
  68  * SCSI host template entry points
  69  */
  70 static int qla4xxx_queuecommand(struct scsi_cmnd *cmd,
  71                                 void (*done) (struct scsi_cmnd *));
  72 static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd);
  73 static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd);
  74 static int qla4xxx_slave_alloc(struct scsi_device *device);
  75 static int qla4xxx_slave_configure(struct scsi_device *device);
  76 static void qla4xxx_slave_destroy(struct scsi_device *sdev);
  77
  78 static struct scsi_host_template qla4xxx_driver_template = {
  79         .module                 = THIS_MODULE,
  80         .name                   = DRIVER_NAME,
  81         .proc_name              = DRIVER_NAME,
  82         .queuecommand           = qla4xxx_queuecommand,
  83
  84         .eh_device_reset_handler = qla4xxx_eh_device_reset,
  85         .eh_host_reset_handler  = qla4xxx_eh_host_reset,
  86
  87         .slave_configure        = qla4xxx_slave_configure,
  88         .slave_alloc            = qla4xxx_slave_alloc,
  89         .slave_destroy          = qla4xxx_slave_destroy,
  90
  91         .this_id                = -1,
  92         .cmd_per_lun            = 3,
  93         .use_clustering         = ENABLE_CLUSTERING,
  94         .sg_tablesize           = SG_ALL,
  95
  96         .max_sectors            = 0xFFFF,
  97 };
  98
  99 static struct iscsi_transport qla4xxx_iscsi_transport = {
 100         .owner                  = THIS_MODULE,
 101         .name                   = DRIVER_NAME,
 102         .param_mask             = ISCSI_CONN_PORT |
 103                                   ISCSI_CONN_ADDRESS |
 104                                   ISCSI_TARGET_NAME |
 105                                   ISCSI_TPGT,
 106         .sessiondata_size       = sizeof(struct ddb_entry),
 107         .host_template          = &qla4xxx_driver_template,
 108
 109         .tgt_dscvr              = qla4xxx_tgt_dscvr,
 110         .get_conn_param         = qla4xxx_conn_get_param,
 111         .get_session_param      = qla4xxx_sess_get_param,
 112         .start_conn             = qla4xxx_conn_start,
 113         .stop_conn              = qla4xxx_conn_stop,
 114         .session_recovery_timedout = qla4xxx_recovery_timedout,
 115 };
 116
 117 static struct scsi_transport_template *qla4xxx_scsi_transport;
 118
 119 static void qla4xxx_recovery_timedout(struct iscsi_cls_session *session)
 120 {
 121         struct ddb_entry *ddb_entry = session->dd_data;
 122         struct scsi_qla_host *ha = ddb_entry->ha;
 123
 124         DEBUG2(printk("scsi%ld: %s: index [%d] port down retry count of (%d) "
 125                       "secs exhausted, marking device DEAD.\n", ha->host_no,
 126                       __func__, ddb_entry->fw_ddb_index,
 127                       ha->port_down_retry_count));
 128
 129         atomic_set(&ddb_entry->state, DDB_STATE_DEAD);
 130
 131         DEBUG2(printk("scsi%ld: %s: scheduling dpc routine - dpc flags = "
 132                       "0x%lx\n", ha->host_no, __func__, ha->dpc_flags));
 133         queue_work(ha->dpc_thread, &ha->dpc_work);
 134 }
 135
 136 static int qla4xxx_conn_start(struct iscsi_cls_conn *conn)
 137 {
 138         struct iscsi_cls_session *session;
 139         struct ddb_entry *ddb_entry;
 140
 141         session = iscsi_dev_to_session(conn->dev.parent);
 142         ddb_entry = session->dd_data;
 143
 144         DEBUG2(printk("scsi%ld: %s: index [%d] starting conn\n",
 145                       ddb_entry->ha->host_no, __func__,
 146                       ddb_entry->fw_ddb_index));
 147         iscsi_unblock_session(session);
 148         return 0;
 149 }
 150
 151 static void qla4xxx_conn_stop(struct iscsi_cls_conn *conn, int flag)
 152 {
 153         struct iscsi_cls_session *session;
 154         struct ddb_entry *ddb_entry;
 155
 156         session = iscsi_dev_to_session(conn->dev.parent);
 157         ddb_entry = session->dd_data;
 158
 159         DEBUG2(printk("scsi%ld: %s: index [%d] stopping conn\n",
 160                       ddb_entry->ha->host_no, __func__,
 161                       ddb_entry->fw_ddb_index));
 162         if (flag == STOP_CONN_RECOVER)
 163                 iscsi_block_session(session);
 164         else
 165                 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
 166 }
 167
 168 static int qla4xxx_sess_get_param(struct iscsi_cls_session *sess,
 169                                   enum iscsi_param param, char *buf)
 170 {
 171         struct ddb_entry *ddb_entry = sess->dd_data;
 172         int len;
 173
 174         switch (param) {
 175         case ISCSI_PARAM_TARGET_NAME:
 176                 len = snprintf(buf, PAGE_SIZE - 1, "%s\n",
 177                                ddb_entry->iscsi_name);
 178                 break;
 179         case ISCSI_PARAM_TPGT:
 180                 len = sprintf(buf, "%u\n", ddb_entry->tpgt);
 181                 break;
 182         default:
 183                 return -ENOSYS;
 184         }
 185
 186         return len;
 187 }
 188
 189 static int qla4xxx_conn_get_param(struct iscsi_cls_conn *conn,
 190                                   enum iscsi_param param, char *buf)
 191 {
 192         struct iscsi_cls_session *session;
 193         struct ddb_entry *ddb_entry;
 194         int len;
 195
 196         session = iscsi_dev_to_session(conn->dev.parent);
 197         ddb_entry = session->dd_data;
 198
 199         switch (param) {
 200         case ISCSI_PARAM_CONN_PORT:
 201                 len = sprintf(buf, "%hu\n", ddb_entry->port);
 202                 break;
 203         case ISCSI_PARAM_CONN_ADDRESS:
 204                 /* TODO: what are the ipv6 bits */
 205                 len = sprintf(buf, "%u.%u.%u.%u\n",
 206                               NIPQUAD(ddb_entry->ip_addr));
 207                 break;
 208         default:
 209                 return -ENOSYS;
 210         }
 211
 212         return len;
 213 }
 214
 215 static int qla4xxx_tgt_dscvr(enum iscsi_tgt_dscvr type, uint32_t host_no,
 216                              uint32_t enable, struct sockaddr *dst_addr)
 217 {
 218         struct scsi_qla_host *ha;
 219         struct Scsi_Host *shost;
 220         struct sockaddr_in *addr;
 221         struct sockaddr_in6 *addr6;
 222         int ret = 0;
 223
 224         shost = scsi_host_lookup(host_no);
 225         if (IS_ERR(shost)) {
 226                 printk(KERN_ERR "Could not find host no %u\n", host_no);
 227                 return -ENODEV;
 228         }
 229
 230         ha = (struct scsi_qla_host *) shost->hostdata;
 231
 232         switch (type) {
 233         case ISCSI_TGT_DSCVR_SEND_TARGETS:
 234                 if (dst_addr->sa_family == AF_INET) {
 235                         addr = (struct sockaddr_in *)dst_addr;
 236                         if (qla4xxx_send_tgts(ha, (char *)&addr->sin_addr,
 237                                               addr->sin_port) != QLA_SUCCESS)
 238                                 ret = -EIO;
 239                 } else if (dst_addr->sa_family == AF_INET6) {
 240                         /*
 241                          * TODO: fix qla4xxx_send_tgts
 242                          */
 243                         addr6 = (struct sockaddr_in6 *)dst_addr;
 244                         if (qla4xxx_send_tgts(ha, (char *)&addr6->sin6_addr,
 245                                               addr6->sin6_port) != QLA_SUCCESS)
 246                                 ret = -EIO;
 247                 } else
 248                         ret = -ENOSYS;
 249                 break;
 250         default:
 251                 ret = -ENOSYS;
 252         }
 253
 254         scsi_host_put(shost);
 255         return ret;
 256 }
 257
 258 void qla4xxx_destroy_sess(struct ddb_entry *ddb_entry)
 259 {
 260         if (!ddb_entry->sess)
 261                 return;
 262
 263         if (ddb_entry->conn) {
 264                 iscsi_if_destroy_session_done(ddb_entry->conn);
 265                 iscsi_destroy_conn(ddb_entry->conn);
 266                 iscsi_remove_session(ddb_entry->sess);
 267         }
 268         iscsi_free_session(ddb_entry->sess);
 269 }
 270
 271 int qla4xxx_add_sess(struct ddb_entry *ddb_entry)
 272 {
 273         int err;
 274
 275         err = iscsi_add_session(ddb_entry->sess, ddb_entry->fw_ddb_index);
 276         if (err) {
 277                 DEBUG2(printk(KERN_ERR "Could not add session.\n"));
 278                 return err;
 279         }
 280
 281         ddb_entry->conn = iscsi_create_conn(ddb_entry->sess, 0);
 282         if (!ddb_entry->conn) {
 283                 iscsi_remove_session(ddb_entry->sess);
 284                 DEBUG2(printk(KERN_ERR "Could not add connection.\n"));
 285                 return -ENOMEM;
 286         }
 287
 288         ddb_entry->sess->recovery_tmo = ddb_entry->ha->port_down_retry_count;
 289         iscsi_if_create_session_done(ddb_entry->conn);
 290         return 0;
 291 }
 292
 293 struct ddb_entry *qla4xxx_alloc_sess(struct scsi_qla_host *ha)
 294 {
 295         struct ddb_entry *ddb_entry;
 296         struct iscsi_cls_session *sess;
 297
 298         sess = iscsi_alloc_session(ha->host, &qla4xxx_iscsi_transport);
 299         if (!sess)
 300                 return NULL;
 301
 302         ddb_entry = sess->dd_data;
 303         memset(ddb_entry, 0, sizeof(*ddb_entry));
 304         ddb_entry->ha = ha;
 305         ddb_entry->sess = sess;
 306         return ddb_entry;
 307 }
 308
 309 /*
 310  * Timer routines
 311  */
 312
 313 static void qla4xxx_start_timer(struct scsi_qla_host *ha, void *func,
 314                                 unsigned long interval)
 315 {
 316         DEBUG(printk("scsi: %s: Starting timer thread for adapter %d\n",
 317                      __func__, ha->host->host_no));
 318         init_timer(&ha->timer);
 319         ha->timer.expires = jiffies + interval * HZ;
 320         ha->timer.data = (unsigned long)ha;
 321         ha->timer.function = (void (*)(unsigned long))func;
 322         add_timer(&ha->timer);
 323         ha->timer_active = 1;
 324 }
 325
 326 static void qla4xxx_stop_timer(struct scsi_qla_host *ha)
 327 {
 328         del_timer_sync(&ha->timer);
 329         ha->timer_active = 0;
 330 }
 331
 332 /***
 333  * qla4xxx_mark_device_missing - mark a device as missing.
 334  * @ha: Pointer to host adapter structure.
 335  * @ddb_entry: Pointer to device database entry
 336  *
 337  * This routine marks a device missing and resets the relogin retry count.
 338  **/
 339 void qla4xxx_mark_device_missing(struct scsi_qla_host *ha,
 340                                  struct ddb_entry *ddb_entry)
 341 {
 342         atomic_set(&ddb_entry->state, DDB_STATE_MISSING);
 343         DEBUG3(printk("scsi%d:%d:%d: index [%d] marked MISSING\n",
 344                       ha->host_no, ddb_entry->bus, ddb_entry->target,
 345                       ddb_entry->fw_ddb_index));
 346         iscsi_conn_error(ddb_entry->conn, ISCSI_ERR_CONN_FAILED);
 347 }
 348
 349 static struct srb* qla4xxx_get_new_srb(struct scsi_qla_host *ha,
 350                                        struct ddb_entry *ddb_entry,
 351                                        struct scsi_cmnd *cmd,
 352                                        void (*done)(struct scsi_cmnd *))
 353 {
 354         struct srb *srb;
 355
 356         srb = mempool_alloc(ha->srb_mempool, GFP_ATOMIC);
 357         if (!srb)
 358                 return srb;
 359
 360         atomic_set(&srb->ref_count, 1);
 361         srb->ha = ha;
 362         srb->ddb = ddb_entry;
 363         srb->cmd = cmd;
 364         srb->flags = 0;
 365         cmd->SCp.ptr = (void *)srb;
 366         cmd->scsi_done = done;
 367
 368         return srb;
 369 }
 370
 371 static void qla4xxx_srb_free_dma(struct scsi_qla_host *ha, struct srb *srb)
 372 {
 373         struct scsi_cmnd *cmd = srb->cmd;
 374
 375         if (srb->flags & SRB_DMA_VALID) {
 376                 scsi_dma_unmap(cmd);
 377                 srb->flags &= ~SRB_DMA_VALID;
 378         }
 379         cmd->SCp.ptr = NULL;
 380 }
 381
 382 void qla4xxx_srb_compl(struct scsi_qla_host *ha, struct srb *srb)
 383 {
 384         struct scsi_cmnd *cmd = srb->cmd;
 385
 386         qla4xxx_srb_free_dma(ha, srb);
 387
 388         mempool_free(srb, ha->srb_mempool);
 389
 390         cmd->scsi_done(cmd);
 391 }
 392
 393 /**
 394  * qla4xxx_queuecommand - scsi layer issues scsi command to driver.
 395  * @cmd: Pointer to Linux's SCSI command structure
 396  * @done_fn: Function that the driver calls to notify the SCSI mid-layer
 397  *      that the command has been processed.
 398  *
 399  * Remarks:
 400  * This routine is invoked by Linux to send a SCSI command to the driver.
 401  * The mid-level driver tries to ensure that queuecommand never gets
 402  * invoked concurrently with itself or the interrupt handler (although
 403  * the interrupt handler may call this routine as part of request-
 404  * completion handling).   Unfortunely, it sometimes calls the scheduler
 405  * in interrupt context which is a big NO! NO!.
 406  **/
 407 static int qla4xxx_queuecommand(struct scsi_cmnd *cmd,
 408                                 void (*done)(struct scsi_cmnd *))
 409 {
 410         struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
 411         struct ddb_entry *ddb_entry = cmd->device->hostdata;
 412         struct srb *srb;
 413         int rval;
 414
 415         if (atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
 416                 if (atomic_read(&ddb_entry->state) == DDB_STATE_DEAD) {
 417                         cmd->result = DID_NO_CONNECT << 16;
 418                         goto qc_fail_command;
 419                 }
 420                 goto qc_host_busy;
 421         }
 422
 423         if (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags))
 424                 goto qc_host_busy;
 425
 426         spin_unlock_irq(ha->host->host_lock);
 427
 428         srb = qla4xxx_get_new_srb(ha, ddb_entry, cmd, done);
 429         if (!srb)
 430                 goto qc_host_busy_lock;
 431
 432         rval = qla4xxx_send_command_to_isp(ha, srb);
 433         if (rval != QLA_SUCCESS)
 434                 goto qc_host_busy_free_sp;
 435
 436         spin_lock_irq(ha->host->host_lock);
 437         return 0;
 438
 439 qc_host_busy_free_sp:
 440         qla4xxx_srb_free_dma(ha, srb);
 441         mempool_free(srb, ha->srb_mempool);
 442
 443 qc_host_busy_lock:
 444         spin_lock_irq(ha->host->host_lock);
 445
 446 qc_host_busy:
 447         return SCSI_MLQUEUE_HOST_BUSY;
 448
 449 qc_fail_command:
 450         done(cmd);
 451
 452         return 0;
 453 }
 454
 455 /**
 456  * qla4xxx_mem_free - frees memory allocated to adapter
 457  * @ha: Pointer to host adapter structure.
 458  *
 459  * Frees memory previously allocated by qla4xxx_mem_alloc
 460  **/
 461 static void qla4xxx_mem_free(struct scsi_qla_host *ha)
 462 {
 463         if (ha->queues)
 464                 dma_free_coherent(&ha->pdev->dev, ha->queues_len, ha->queues,
 465                                   ha->queues_dma);
 466
 467         ha->queues_len = 0;
 468         ha->queues = NULL;
 469         ha->queues_dma = 0;
 470         ha->request_ring = NULL;
 471         ha->request_dma = 0;
 472         ha->response_ring = NULL;
 473         ha->response_dma = 0;
 474         ha->shadow_regs = NULL;
 475         ha->shadow_regs_dma = 0;
 476
 477         /* Free srb pool. */
 478         if (ha->srb_mempool)
 479                 mempool_destroy(ha->srb_mempool);
 480
 481         ha->srb_mempool = NULL;
 482
 483         /* release io space registers  */
 484         if (ha->reg)
 485                 iounmap(ha->reg);
 486         pci_release_regions(ha->pdev);
 487 }
 488
 489 /**
 490  * qla4xxx_mem_alloc - allocates memory for use by adapter.
 491  * @ha: Pointer to host adapter structure
 492  *
 493  * Allocates DMA memory for request and response queues. Also allocates memory
 494  * for srbs.
 495  **/
 496 static int qla4xxx_mem_alloc(struct scsi_qla_host *ha)
 497 {
 498         unsigned long align;
 499
 500         /* Allocate contiguous block of DMA memory for queues. */
 501         ha->queues_len = ((REQUEST_QUEUE_DEPTH * QUEUE_SIZE) +
 502                           (RESPONSE_QUEUE_DEPTH * QUEUE_SIZE) +
 503                           sizeof(struct shadow_regs) +
 504                           MEM_ALIGN_VALUE +
 505                           (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
 506         ha->queues = dma_alloc_coherent(&ha->pdev->dev, ha->queues_len,
 507                                         &ha->queues_dma, GFP_KERNEL);
 508         if (ha->queues == NULL) {
 509                 dev_warn(&ha->pdev->dev,
 510                         "Memory Allocation failed - queues.\n");
 511
 512                 goto mem_alloc_error_exit;
 513         }
 514         memset(ha->queues, 0, ha->queues_len);
 515
 516         /*
 517          * As per RISC alignment requirements -- the bus-address must be a
 518          * multiple of the request-ring size (in bytes).
 519          */
 520         align = 0;
 521         if ((unsigned long)ha->queues_dma & (MEM_ALIGN_VALUE - 1))
 522                 align = MEM_ALIGN_VALUE - ((unsigned long)ha->queues_dma &
 523                                            (MEM_ALIGN_VALUE - 1));
 524
 525         /* Update request and response queue pointers. */
 526         ha->request_dma = ha->queues_dma + align;
 527         ha->request_ring = (struct queue_entry *) (ha->queues + align);
 528         ha->response_dma = ha->queues_dma + align +
 529                 (REQUEST_QUEUE_DEPTH * QUEUE_SIZE);
 530         ha->response_ring = (struct queue_entry *) (ha->queues + align +
 531                                                     (REQUEST_QUEUE_DEPTH *
 532                                                      QUEUE_SIZE));
 533         ha->shadow_regs_dma = ha->queues_dma + align +
 534                 (REQUEST_QUEUE_DEPTH * QUEUE_SIZE) +
 535                 (RESPONSE_QUEUE_DEPTH * QUEUE_SIZE);
 536         ha->shadow_regs = (struct shadow_regs *) (ha->queues + align +
 537                                                   (REQUEST_QUEUE_DEPTH *
 538                                                    QUEUE_SIZE) +
 539                                                   (RESPONSE_QUEUE_DEPTH *
 540                                                    QUEUE_SIZE));
 541
 542         /* Allocate memory for srb pool. */
 543         ha->srb_mempool = mempool_create(SRB_MIN_REQ, mempool_alloc_slab,
 544                                          mempool_free_slab, srb_cachep);
 545         if (ha->srb_mempool == NULL) {
 546                 dev_warn(&ha->pdev->dev,
 547                         "Memory Allocation failed - SRB Pool.\n");
 548
 549                 goto mem_alloc_error_exit;
 550         }
 551
 552         return QLA_SUCCESS;
 553
 554 mem_alloc_error_exit:
 555         qla4xxx_mem_free(ha);
 556         return QLA_ERROR;
 557 }
 558
 559 /**
 560  * qla4xxx_timer - checks every second for work to do.
 561  * @ha: Pointer to host adapter structure.
 562  **/
 563 static void qla4xxx_timer(struct scsi_qla_host *ha)
 564 {
 565         struct ddb_entry *ddb_entry, *dtemp;
 566         int start_dpc = 0;
 567
 568         /* Search for relogin's to time-out and port down retry. */
 569         list_for_each_entry_safe(ddb_entry, dtemp, &ha->ddb_list, list) {
 570                 /* Count down time between sending relogins */
 571                 if (adapter_up(ha) &&
 572                     !test_bit(DF_RELOGIN, &ddb_entry->flags) &&
 573                     atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
 574                         if (atomic_read(&ddb_entry->retry_relogin_timer) !=
 575                             INVALID_ENTRY) {
 576                                 if (atomic_read(&ddb_entry->retry_relogin_timer)
 577                                                 == 0) {
 578                                         atomic_set(&ddb_entry->
 579                                                 retry_relogin_timer,
 580                                                 INVALID_ENTRY);
 581                                         set_bit(DPC_RELOGIN_DEVICE,
 582                                                 &ha->dpc_flags);
 583                                         set_bit(DF_RELOGIN, &ddb_entry->flags);
 584                                         DEBUG2(printk("scsi%ld: %s: index [%d]"
 585                                                       " login device\n",
 586                                                       ha->host_no, __func__,
 587                                                       ddb_entry->fw_ddb_index));
 588                                 } else
 589                                         atomic_dec(&ddb_entry->
 590                                                         retry_relogin_timer);
 591                         }
 592                 }
 593
 594                 /* Wait for relogin to timeout */
 595                 if (atomic_read(&ddb_entry->relogin_timer) &&
 596                     (atomic_dec_and_test(&ddb_entry->relogin_timer) != 0)) {
 597                         /*
 598                          * If the relogin times out and the device is
 599                          * still NOT ONLINE then try and relogin again.
 600                          */
 601                         if (atomic_read(&ddb_entry->state) !=
 602                             DDB_STATE_ONLINE &&
 603                             ddb_entry->fw_ddb_device_state ==
 604                             DDB_DS_SESSION_FAILED) {
 605                                 /* Reset retry relogin timer */
 606                                 atomic_inc(&ddb_entry->relogin_retry_count);
 607                                 DEBUG2(printk("scsi%ld: index[%d] relogin"
 608                                               " timed out-retrying"
 609                                               " relogin (%d)\n",
 610                                               ha->host_no,
 611                                               ddb_entry->fw_ddb_index,
 612                                               atomic_read(&ddb_entry->
 613                                                           relogin_retry_count))
 614                                         );
 615                                 start_dpc++;
 616                                 DEBUG(printk("scsi%ld:%d:%d: index [%d] "
 617                                              "initate relogin after"
 618                                              " %d seconds\n",
 619                                              ha->host_no, ddb_entry->bus,
 620                                              ddb_entry->target,
 621                                              ddb_entry->fw_ddb_index,
 622                                              ddb_entry->default_time2wait + 4)
 623                                         );
 624
 625                                 atomic_set(&ddb_entry->retry_relogin_timer,
 626                                            ddb_entry->default_time2wait + 4);
 627                         }
 628                 }
 629         }
 630
 631         /* Check for heartbeat interval. */
 632         if (ha->firmware_options & FWOPT_HEARTBEAT_ENABLE &&
 633             ha->heartbeat_interval != 0) {
 634                 ha->seconds_since_last_heartbeat++;
 635                 if (ha->seconds_since_last_heartbeat >
 636                     ha->heartbeat_interval + 2)
 637                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 638         }
 639
 640
 641         /* Wakeup the dpc routine for this adapter, if needed. */
 642         if ((start_dpc ||
 643              test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
 644              test_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags) ||
 645              test_bit(DPC_RELOGIN_DEVICE, &ha->dpc_flags) ||
 646              test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags) ||
 647              test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags) ||
 648              test_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags) ||
 649              test_bit(DPC_AEN, &ha->dpc_flags)) &&
 650              ha->dpc_thread) {
 651                 DEBUG2(printk("scsi%ld: %s: scheduling dpc routine"
 652                               " - dpc flags = 0x%lx\n",
 653                               ha->host_no, __func__, ha->dpc_flags));
 654                 queue_work(ha->dpc_thread, &ha->dpc_work);
 655         }
 656
 657         /* Reschedule timer thread to call us back in one second */
 658         mod_timer(&ha->timer, jiffies + HZ);
 659
 660         DEBUG2(ha->seconds_since_last_intr++);
 661 }
 662
 663 /**
 664  * qla4xxx_cmd_wait - waits for all outstanding commands to complete
 665  * @ha: Pointer to host adapter structure.
 666  *
 667  * This routine stalls the driver until all outstanding commands are returned.
 668  * Caller must release the Hardware Lock prior to calling this routine.
 669  **/
 670 static int qla4xxx_cmd_wait(struct scsi_qla_host *ha)
 671 {
 672         uint32_t index = 0;
 673         int stat = QLA_SUCCESS;
 674         unsigned long flags;
 675         struct scsi_cmnd *cmd;
 676         int wait_cnt = WAIT_CMD_TOV;    /*
 677                                          * Initialized for 30 seconds as we
 678                                          * expect all commands to retuned
 679                                          * ASAP.
 680                                          */
 681
 682         while (wait_cnt) {
 683                 spin_lock_irqsave(&ha->hardware_lock, flags);
 684                 /* Find a command that hasn't completed. */
 685                 for (index = 0; index < ha->host->can_queue; index++) {
 686                         cmd = scsi_host_find_tag(ha->host, index);
 687                         if (cmd != NULL)
 688                                 break;
 689                 }
 690                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 691
 692                 /* If No Commands are pending, wait is complete */
 693                 if (index == ha->host->can_queue) {
 694                         break;
 695                 }
 696
 697                 /* If we timed out on waiting for commands to come back
 698                  * return ERROR.
 699                  */
 700                 wait_cnt--;
 701                 if (wait_cnt == 0)
 702                         stat = QLA_ERROR;
 703                 else {
 704                         msleep(1000);
 705                 }
 706         }                       /* End of While (wait_cnt) */
 707
 708         return stat;
 709 }
 710
 711 void qla4xxx_hw_reset(struct scsi_qla_host *ha)
 712 {
 713         uint32_t ctrl_status;
 714         unsigned long flags = 0;
 715
 716         DEBUG2(printk(KERN_ERR "scsi%ld: %s\n", ha->host_no, __func__));
 717
 718         spin_lock_irqsave(&ha->hardware_lock, flags);
 719
 720         /*
 721          * If the SCSI Reset Interrupt bit is set, clear it.
 722          * Otherwise, the Soft Reset won't work.
 723          */
 724         ctrl_status = readw(&ha->reg->ctrl_status);
 725         if ((ctrl_status & CSR_SCSI_RESET_INTR) != 0)
 726                 writel(set_rmask(CSR_SCSI_RESET_INTR), &ha->reg->ctrl_status);
 727
 728         /* Issue Soft Reset */
 729         writel(set_rmask(CSR_SOFT_RESET), &ha->reg->ctrl_status);
 730         readl(&ha->reg->ctrl_status);
 731
 732         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 733 }
 734
 735 /**
 736  * qla4xxx_soft_reset - performs soft reset.
 737  * @ha: Pointer to host adapter structure.
 738  **/
 739 int qla4xxx_soft_reset(struct scsi_qla_host *ha)
 740 {
 741         uint32_t max_wait_time;
 742         unsigned long flags = 0;
 743         int status = QLA_ERROR;
 744         uint32_t ctrl_status;
 745
 746         qla4xxx_hw_reset(ha);
 747
 748         /* Wait until the Network Reset Intr bit is cleared */
 749         max_wait_time = RESET_INTR_TOV;
 750         do {
 751                 spin_lock_irqsave(&ha->hardware_lock, flags);
 752                 ctrl_status = readw(&ha->reg->ctrl_status);
 753                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 754
 755                 if ((ctrl_status & CSR_NET_RESET_INTR) == 0)
 756                         break;
 757
 758                 msleep(1000);
 759         } while ((--max_wait_time));
 760
 761         if ((ctrl_status & CSR_NET_RESET_INTR) != 0) {
 762                 DEBUG2(printk(KERN_WARNING
 763                               "scsi%ld: Network Reset Intr not cleared by "
 764                               "Network function, clearing it now!\n",
 765                               ha->host_no));
 766                 spin_lock_irqsave(&ha->hardware_lock, flags);
 767                 writel(set_rmask(CSR_NET_RESET_INTR), &ha->reg->ctrl_status);
 768                 readl(&ha->reg->ctrl_status);
 769                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 770         }
 771
 772         /* Wait until the firmware tells us the Soft Reset is done */
 773         max_wait_time = SOFT_RESET_TOV;
 774         do {
 775                 spin_lock_irqsave(&ha->hardware_lock, flags);
 776                 ctrl_status = readw(&ha->reg->ctrl_status);
 777                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 778
 779                 if ((ctrl_status & CSR_SOFT_RESET) == 0) {
 780                         status = QLA_SUCCESS;
 781                         break;
 782                 }
 783
 784                 msleep(1000);
 785         } while ((--max_wait_time));
 786
 787         /*
 788          * Also, make sure that the SCSI Reset Interrupt bit has been cleared
 789          * after the soft reset has taken place.
 790          */
 791         spin_lock_irqsave(&ha->hardware_lock, flags);
 792         ctrl_status = readw(&ha->reg->ctrl_status);
 793         if ((ctrl_status & CSR_SCSI_RESET_INTR) != 0) {
 794                 writel(set_rmask(CSR_SCSI_RESET_INTR), &ha->reg->ctrl_status);
 795                 readl(&ha->reg->ctrl_status);
 796         }
 797         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 798
 799         /* If soft reset fails then most probably the bios on other
 800          * function is also enabled.
 801          * Since the initialization is sequential the other fn
 802          * wont be able to acknowledge the soft reset.
 803          * Issue a force soft reset to workaround this scenario.
 804          */
 805         if (max_wait_time == 0) {
 806                 /* Issue Force Soft Reset */
 807                 spin_lock_irqsave(&ha->hardware_lock, flags);
 808                 writel(set_rmask(CSR_FORCE_SOFT_RESET), &ha->reg->ctrl_status);
 809                 readl(&ha->reg->ctrl_status);
 810                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 811                 /* Wait until the firmware tells us the Soft Reset is done */
 812                 max_wait_time = SOFT_RESET_TOV;
 813                 do {
 814                         spin_lock_irqsave(&ha->hardware_lock, flags);
 815                         ctrl_status = readw(&ha->reg->ctrl_status);
 816                         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 817
 818                         if ((ctrl_status & CSR_FORCE_SOFT_RESET) == 0) {
 819                                 status = QLA_SUCCESS;
 820                                 break;
 821                         }
 822
 823                         msleep(1000);
 824                 } while ((--max_wait_time));
 825         }
 826
 827         return status;
 828 }
 829
 830 /**
 831  * qla4xxx_flush_active_srbs - returns all outstanding i/o requests to O.S.
 832  * @ha: Pointer to host adapter structure.
 833  *
 834  * This routine is called just prior to a HARD RESET to return all
 835  * outstanding commands back to the Operating System.
 836  * Caller should make sure that the following locks are released
 837  * before this calling routine: Hardware lock, and io_request_lock.
 838  **/
 839 static void qla4xxx_flush_active_srbs(struct scsi_qla_host *ha)
 840 {
 841         struct srb *srb;
 842         int i;
 843         unsigned long flags;
 844
 845         spin_lock_irqsave(&ha->hardware_lock, flags);
 846         for (i = 0; i < ha->host->can_queue; i++) {
 847                 srb = qla4xxx_del_from_active_array(ha, i);
 848                 if (srb != NULL) {
 849                         srb->cmd->result = DID_RESET << 16;
 850                         qla4xxx_srb_compl(ha, srb);
 851                 }
 852         }
 853         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 854
 855 }
 856
 857 /**
 858  * qla4xxx_recover_adapter - recovers adapter after a fatal error
 859  * @ha: Pointer to host adapter structure.
 860  * @renew_ddb_list: Indicates what to do with the adapter's ddb list
 861  *      after adapter recovery has completed.
 862  *      0=preserve ddb list, 1=destroy and rebuild ddb list
 863  **/
 864 static int qla4xxx_recover_adapter(struct scsi_qla_host *ha,
 865                                 uint8_t renew_ddb_list)
 866 {
 867         int status;
 868
 869         /* Stall incoming I/O until we are done */
 870         clear_bit(AF_ONLINE, &ha->flags);
 871         DEBUG2(printk("scsi%ld: %s calling qla4xxx_cmd_wait\n", ha->host_no,
 872                       __func__));
 873
 874         /* Wait for outstanding commands to complete.
 875          * Stalls the driver for max 30 secs
 876          */
 877         status = qla4xxx_cmd_wait(ha);
 878
 879         qla4xxx_disable_intrs(ha);
 880
 881         /* Flush any pending ddb changed AENs */
 882         qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
 883
 884         /* Reset the firmware.  If successful, function
 885          * returns with ISP interrupts enabled.
 886          */
 887         if (status == QLA_SUCCESS) {
 888                 DEBUG2(printk("scsi%ld: %s - Performing soft reset..\n",
 889                               ha->host_no, __func__));
 890                 qla4xxx_flush_active_srbs(ha);
 891                 if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS)
 892                         status = qla4xxx_soft_reset(ha);
 893                 else
 894                         status = QLA_ERROR;
 895         }
 896
 897         /* Flush any pending ddb changed AENs */
 898         qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
 899
 900         /* Re-initialize firmware. If successful, function returns
 901          * with ISP interrupts enabled */
 902         if (status == QLA_SUCCESS) {
 903                 DEBUG2(printk("scsi%ld: %s - Initializing adapter..\n",
 904                               ha->host_no, __func__));
 905
 906                 /* If successful, AF_ONLINE flag set in
 907                  * qla4xxx_initialize_adapter */
 908                 status = qla4xxx_initialize_adapter(ha, renew_ddb_list);
 909         }
 910
 911         /* Failed adapter initialization?
 912          * Retry reset_ha only if invoked via DPC (DPC_RESET_HA) */
 913         if ((test_bit(AF_ONLINE, &ha->flags) == 0) &&
 914             (test_bit(DPC_RESET_HA, &ha->dpc_flags))) {
 915                 /* Adapter initialization failed, see if we can retry
 916                  * resetting the ha */
 917                 if (!test_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags)) {
 918                         ha->retry_reset_ha_cnt = MAX_RESET_HA_RETRIES;
 919                         DEBUG2(printk("scsi%ld: recover adapter - retrying "
 920                                       "(%d) more times\n", ha->host_no,
 921                                       ha->retry_reset_ha_cnt));
 922                         set_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
 923                         status = QLA_ERROR;
 924                 } else {
 925                         if (ha->retry_reset_ha_cnt > 0) {
 926                                 /* Schedule another Reset HA--DPC will retry */
 927                                 ha->retry_reset_ha_cnt--;
 928                                 DEBUG2(printk("scsi%ld: recover adapter - "
 929                                               "retry remaining %d\n",
 930                                               ha->host_no,
 931                                               ha->retry_reset_ha_cnt));
 932                                 status = QLA_ERROR;
 933                         }
 934
 935                         if (ha->retry_reset_ha_cnt == 0) {
 936                                 /* Recover adapter retries have been exhausted.
 937                                  * Adapter DEAD */
 938                                 DEBUG2(printk("scsi%ld: recover adapter "
 939                                               "failed - board disabled\n",
 940                                               ha->host_no));
 941                                 qla4xxx_flush_active_srbs(ha);
 942                                 clear_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
 943                                 clear_bit(DPC_RESET_HA, &ha->dpc_flags);
 944                                 clear_bit(DPC_RESET_HA_DESTROY_DDB_LIST,
 945                                           &ha->dpc_flags);
 946                                 status = QLA_ERROR;
 947                         }
 948                 }
 949         } else {
 950                 clear_bit(DPC_RESET_HA, &ha->dpc_flags);
 951                 clear_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags);
 952                 clear_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
 953         }
 954
 955         ha->adapter_error_count++;
 956
 957         if (status == QLA_SUCCESS)
 958                 qla4xxx_enable_intrs(ha);
 959
 960         DEBUG2(printk("scsi%ld: recover adapter .. DONE\n", ha->host_no));
 961         return status;
 962 }
 963
 964 /**
 965  * qla4xxx_do_dpc - dpc routine
 966  * @data: in our case pointer to adapter structure
 967  *
 968  * This routine is a task that is schedule by the interrupt handler
 969  * to perform the background processing for interrupts.  We put it
 970  * on a task queue that is consumed whenever the scheduler runs; that's
 971  * so you can do anything (i.e. put the process to sleep etc).  In fact,
 972  * the mid-level tries to sleep when it reaches the driver threshold
 973  * "host->can_queue". This can cause a panic if we were in our interrupt code.
 974  **/
 975 static void qla4xxx_do_dpc(struct work_struct *work)
 976 {
 977         struct scsi_qla_host *ha =
 978                 container_of(work, struct scsi_qla_host, dpc_work);
 979         struct ddb_entry *ddb_entry, *dtemp;
 980         int status = QLA_ERROR;
 981
 982         DEBUG2(printk("scsi%ld: %s: DPC handler waking up."
 983                 "flags = 0x%08lx, dpc_flags = 0x%08lx ctrl_stat = 0x%08x\n",
 984                 ha->host_no, __func__, ha->flags, ha->dpc_flags,
 985                 readw(&ha->reg->ctrl_status)));
 986
 987         /* Initialization not yet finished. Don't do anything yet. */
 988         if (!test_bit(AF_INIT_DONE, &ha->flags))
 989                 return;
 990
 991         if (adapter_up(ha) ||
 992             test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
 993             test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags) ||
 994             test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags)) {
 995                 if (test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags) ||
 996                         test_bit(DPC_RESET_HA, &ha->dpc_flags))
 997                         qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST);
 998
 999                 if (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags)) {
1000                         uint8_t wait_time = RESET_INTR_TOV;
1001
1002                         while ((readw(&ha->reg->ctrl_status) &
1003                                 (CSR_SOFT_RESET | CSR_FORCE_SOFT_RESET)) != 0) {
1004                                 if (--wait_time == 0)
1005                                         break;
1006                                 msleep(1000);
1007                         }
1008                         if (wait_time == 0)
1009                                 DEBUG2(printk("scsi%ld: %s: SR|FSR "
1010                                               "bit not cleared-- resetting\n",
1011                                               ha->host_no, __func__));
1012                         qla4xxx_flush_active_srbs(ha);
1013                         if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS) {
1014                                 qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
1015                                 status = qla4xxx_initialize_adapter(ha,
1016                                                 PRESERVE_DDB_LIST);
1017                         }
1018                         clear_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
1019                         if (status == QLA_SUCCESS)
1020                                 qla4xxx_enable_intrs(ha);
1021                 }
1022         }
1023
1024         /* ---- process AEN? --- */
1025         if (test_and_clear_bit(DPC_AEN, &ha->dpc_flags))
1026                 qla4xxx_process_aen(ha, PROCESS_ALL_AENS);
1027
1028         /* ---- Get DHCP IP Address? --- */
1029         if (test_and_clear_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags))
1030                 qla4xxx_get_dhcp_ip_address(ha);
1031
1032         /* ---- relogin device? --- */
1033         if (adapter_up(ha) &&
1034             test_and_clear_bit(DPC_RELOGIN_DEVICE, &ha->dpc_flags)) {
1035                 list_for_each_entry_safe(ddb_entry, dtemp,
1036                                          &ha->ddb_list, list) {
1037                         if (test_and_clear_bit(DF_RELOGIN, &ddb_entry->flags) &&
1038                             atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE)
1039                                 qla4xxx_relogin_device(ha, ddb_entry);
1040
1041                         /*
1042                          * If mbx cmd times out there is no point
1043                          * in continuing further.
1044                          * With large no of targets this can hang
1045                          * the system.
1046                          */
1047                         if (test_bit(DPC_RESET_HA, &ha->dpc_flags)) {
1048                                 printk(KERN_WARNING "scsi%ld: %s: "
1049                                        "need to reset hba\n",
1050                                        ha->host_no, __func__);
1051                                 break;
1052                         }
1053                 }
1054         }
1055 }
1056
1057 /**
1058  * qla4xxx_free_adapter - release the adapter
1059  * @ha: pointer to adapter structure
1060  **/
1061 static void qla4xxx_free_adapter(struct scsi_qla_host *ha)
1062 {
1063
1064         if (test_bit(AF_INTERRUPTS_ON, &ha->flags)) {
1065                 /* Turn-off interrupts on the card. */
1066                 qla4xxx_disable_intrs(ha);
1067         }
1068
1069         /* Kill the kernel thread for this host */
1070         if (ha->dpc_thread)
1071                 destroy_workqueue(ha->dpc_thread);
1072
1073         /* Issue Soft Reset to put firmware in unknown state */
1074         if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS)
1075                 qla4xxx_hw_reset(ha);
1076
1077         /* Remove timer thread, if present */
1078         if (ha->timer_active)
1079                 qla4xxx_stop_timer(ha);
1080
1081         /* Detach interrupts */
1082         if (test_and_clear_bit(AF_IRQ_ATTACHED, &ha->flags))
1083                 free_irq(ha->pdev->irq, ha);
1084
1085         /* free extra memory */
1086         qla4xxx_mem_free(ha);
1087
1088         pci_disable_device(ha->pdev);
1089
1090 }
1091
1092 /***
1093  * qla4xxx_iospace_config - maps registers
1094  * @ha: pointer to adapter structure
1095  *
1096  * This routines maps HBA's registers from the pci address space
1097  * into the kernel virtual address space for memory mapped i/o.
1098  **/
1099 static int qla4xxx_iospace_config(struct scsi_qla_host *ha)
1100 {
1101         unsigned long pio, pio_len, pio_flags;
1102         unsigned long mmio, mmio_len, mmio_flags;
1103
1104         pio = pci_resource_start(ha->pdev, 0);
1105         pio_len = pci_resource_len(ha->pdev, 0);
1106         pio_flags = pci_resource_flags(ha->pdev, 0);
1107         if (pio_flags & IORESOURCE_IO) {
1108                 if (pio_len < MIN_IOBASE_LEN) {
1109                         dev_warn(&ha->pdev->dev,
1110                                 "Invalid PCI I/O region size\n");
1111                         pio = 0;
1112                 }
1113         } else {
1114                 dev_warn(&ha->pdev->dev, "region #0 not a PIO resource\n");
1115                 pio = 0;
1116         }
1117
1118         /* Use MMIO operations for all accesses. */
1119         mmio = pci_resource_start(ha->pdev, 1);
1120         mmio_len = pci_resource_len(ha->pdev, 1);
1121         mmio_flags = pci_resource_flags(ha->pdev, 1);
1122
1123         if (!(mmio_flags & IORESOURCE_MEM)) {
1124                 dev_err(&ha->pdev->dev,
1125                         "region #0 not an MMIO resource, aborting\n");
1126
1127                 goto iospace_error_exit;
1128         }
1129         if (mmio_len < MIN_IOBASE_LEN) {
1130                 dev_err(&ha->pdev->dev,
1131                         "Invalid PCI mem region size, aborting\n");
1132                 goto iospace_error_exit;
1133         }
1134
1135         if (pci_request_regions(ha->pdev, DRIVER_NAME)) {
1136                 dev_warn(&ha->pdev->dev,
1137                         "Failed to reserve PIO/MMIO regions\n");
1138
1139                 goto iospace_error_exit;
1140         }
1141
1142         ha->pio_address = pio;
1143         ha->pio_length = pio_len;
1144         ha->reg = ioremap(mmio, MIN_IOBASE_LEN);
1145         if (!ha->reg) {
1146                 dev_err(&ha->pdev->dev,
1147                         "cannot remap MMIO, aborting\n");
1148
1149                 goto iospace_error_exit;
1150         }
1151
1152         return 0;
1153
1154 iospace_error_exit:
1155         return -ENOMEM;
1156 }
1157
1158 /**
1159  * qla4xxx_probe_adapter - callback function to probe HBA
1160  * @pdev: pointer to pci_dev structure
1161  * @pci_device_id: pointer to pci_device entry
1162  *
1163  * This routine will probe for Qlogic 4xxx iSCSI host adapters.
1164  * It returns zero if successful. It also initializes all data necessary for
1165  * the driver.
1166  **/
1167 static int __devinit qla4xxx_probe_adapter(struct pci_dev *pdev,
1168                                            const struct pci_device_id *ent)
1169 {
1170         int ret = -ENODEV, status;
1171         struct Scsi_Host *host;
1172         struct scsi_qla_host *ha;
1173         struct ddb_entry *ddb_entry, *ddbtemp;
1174         uint8_t init_retry_count = 0;
1175         char buf[34];
1176
1177         if (pci_enable_device(pdev))
1178                 return -1;
1179
1180         host = scsi_host_alloc(&qla4xxx_driver_template, sizeof(*ha));
1181         if (host == NULL) {
1182                 printk(KERN_WARNING
1183                        "qla4xxx: Couldn't allocate host from scsi layer!\n");
1184                 goto probe_disable_device;
1185         }
1186
1187         /* Clear our data area */
1188         ha = (struct scsi_qla_host *) host->hostdata;
1189         memset(ha, 0, sizeof(*ha));
1190
1191         /* Save the information from PCI BIOS.  */
1192         ha->pdev = pdev;
1193         ha->host = host;
1194         ha->host_no = host->host_no;
1195
1196         /* Configure PCI I/O space. */
1197         ret = qla4xxx_iospace_config(ha);
1198         if (ret)
1199                 goto probe_failed;
1200
1201         dev_info(&ha->pdev->dev, "Found an ISP%04x, irq %d, iobase 0x%p\n",
1202                    pdev->device, pdev->irq, ha->reg);
1203
1204         qla4xxx_config_dma_addressing(ha);
1205
1206         /* Initialize lists and spinlocks. */
1207         INIT_LIST_HEAD(&ha->ddb_list);
1208         INIT_LIST_HEAD(&ha->free_srb_q);
1209
1210         mutex_init(&ha->mbox_sem);
1211
1212         spin_lock_init(&ha->hardware_lock);
1213
1214         /* Allocate dma buffers */
1215         if (qla4xxx_mem_alloc(ha)) {
1216                 dev_warn(&ha->pdev->dev,
1217                            "[ERROR] Failed to allocate memory for adapter\n");
1218
1219                 ret = -ENOMEM;
1220                 goto probe_failed;
1221         }
1222
1223         /*
1224          * Initialize the Host adapter request/response queues and
1225          * firmware
1226          * NOTE: interrupts enabled upon successful completion
1227          */
1228         status = qla4xxx_initialize_adapter(ha, REBUILD_DDB_LIST);
1229         while (status == QLA_ERROR && init_retry_count++ < MAX_INIT_RETRIES) {
1230                 DEBUG2(printk("scsi: %s: retrying adapter initialization "
1231                               "(%d)\n", __func__, init_retry_count));
1232                 qla4xxx_soft_reset(ha);
1233                 status = qla4xxx_initialize_adapter(ha, REBUILD_DDB_LIST);
1234         }
1235         if (status == QLA_ERROR) {
1236                 dev_warn(&ha->pdev->dev, "Failed to initialize adapter\n");
1237
1238                 ret = -ENODEV;
1239                 goto probe_failed;
1240         }
1241
1242         host->cmd_per_lun = 3;
1243         host->max_channel = 0;
1244         host->max_lun = MAX_LUNS - 1;
1245         host->max_id = MAX_TARGETS;
1246         host->max_cmd_len = IOCB_MAX_CDB_LEN;
1247         host->can_queue = MAX_SRBS ;
1248         host->transportt = qla4xxx_scsi_transport;
1249
1250         ret = scsi_init_shared_tag_map(host, MAX_SRBS);
1251         if (ret) {
1252                 dev_warn(&ha->pdev->dev, "scsi_init_shared_tag_map failed");
1253                 goto probe_failed;
1254         }
1255
1256         /* Startup the kernel thread for this host adapter. */
1257         DEBUG2(printk("scsi: %s: Starting kernel thread for "
1258                       "qla4xxx_dpc\n", __func__));
1259         sprintf(buf, "qla4xxx_%lu_dpc", ha->host_no);
1260         ha->dpc_thread = create_singlethread_workqueue(buf);
1261         if (!ha->dpc_thread) {
1262                 dev_warn(&ha->pdev->dev, "Unable to start DPC thread!\n");
1263                 ret = -ENODEV;
1264                 goto probe_failed;
1265         }
1266         INIT_WORK(&ha->dpc_work, qla4xxx_do_dpc);
1267
1268         ret = request_irq(pdev->irq, qla4xxx_intr_handler,
1269                           IRQF_DISABLED | IRQF_SHARED, "qla4xxx", ha);
1270         if (ret) {
1271                 dev_warn(&ha->pdev->dev, "Failed to reserve interrupt %d"
1272                         " already in use.\n", pdev->irq);
1273                 goto probe_failed;
1274         }
1275         set_bit(AF_IRQ_ATTACHED, &ha->flags);
1276         host->irq = pdev->irq;
1277         DEBUG(printk("scsi%d: irq %d attached\n", ha->host_no, ha->pdev->irq));
1278
1279         qla4xxx_enable_intrs(ha);
1280
1281         /* Start timer thread. */
1282         qla4xxx_start_timer(ha, qla4xxx_timer, 1);
1283
1284         set_bit(AF_INIT_DONE, &ha->flags);
1285
1286         pci_set_drvdata(pdev, ha);
1287
1288         ret = scsi_add_host(host, &pdev->dev);
1289         if (ret)
1290                 goto probe_failed;
1291
1292         /* Update transport device information for all devices. */
1293         list_for_each_entry_safe(ddb_entry, ddbtemp, &ha->ddb_list, list) {
1294                 if (ddb_entry->fw_ddb_device_state == DDB_DS_SESSION_ACTIVE)
1295                         if (qla4xxx_add_sess(ddb_entry))
1296                                 goto remove_host;
1297         }
1298
1299         printk(KERN_INFO
1300                " QLogic iSCSI HBA Driver version: %s\n"
1301                "  QLogic ISP%04x @ %s, host#=%ld, fw=%02d.%02d.%02d.%02d\n",
1302                qla4xxx_version_str, ha->pdev->device, pci_name(ha->pdev),
1303                ha->host_no, ha->firmware_version[0], ha->firmware_version[1],
1304                ha->patch_number, ha->build_number);
1305
1306         return 0;
1307
1308 remove_host:
1309         qla4xxx_free_ddb_list(ha);
1310         scsi_remove_host(host);
1311
1312 probe_failed:
1313         qla4xxx_free_adapter(ha);
1314         scsi_host_put(ha->host);
1315
1316 probe_disable_device:
1317         pci_disable_device(pdev);
1318
1319         return ret;
1320 }
1321
1322 /**
1323  * qla4xxx_remove_adapter - calback function to remove adapter.
1324  * @pci_dev: PCI device pointer
1325  **/
1326 static void __devexit qla4xxx_remove_adapter(struct pci_dev *pdev)
1327 {
1328         struct scsi_qla_host *ha;
1329
1330         ha = pci_get_drvdata(pdev);
1331
1332         qla4xxx_disable_intrs(ha);
1333
1334         while (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags))
1335                 ssleep(1);
1336
1337         /* remove devs from iscsi_sessions to scsi_devices */
1338         qla4xxx_free_ddb_list(ha);
1339
1340         scsi_remove_host(ha->host);
1341
1342         qla4xxx_free_adapter(ha);
1343
1344         scsi_host_put(ha->host);
1345
1346         pci_set_drvdata(pdev, NULL);
1347 }
1348
1349 /**
1350  * qla4xxx_config_dma_addressing() - Configure OS DMA addressing method.
1351  * @ha: HA context
1352  *
1353  * At exit, the @ha's flags.enable_64bit_addressing set to indicated
1354  * supported addressing method.
1355  */
1356 static void qla4xxx_config_dma_addressing(struct scsi_qla_host *ha)
1357 {
1358         int retval;
1359
1360         /* Update our PCI device dma_mask for full 64 bit mask */
1361         if (pci_set_dma_mask(ha->pdev, DMA_64BIT_MASK) == 0) {
1362                 if (pci_set_consistent_dma_mask(ha->pdev, DMA_64BIT_MASK)) {
1363                         dev_dbg(&ha->pdev->dev,
1364                                   "Failed to set 64 bit PCI consistent mask; "
1365                                    "using 32 bit.\n");
1366                         retval = pci_set_consistent_dma_mask(ha->pdev,
1367                                                              DMA_32BIT_MASK);
1368                 }
1369         } else
1370                 retval = pci_set_dma_mask(ha->pdev, DMA_32BIT_MASK);
1371 }
1372
1373 static int qla4xxx_slave_alloc(struct scsi_device *sdev)
1374 {
1375         struct iscsi_cls_session *sess = starget_to_session(sdev->sdev_target);
1376         struct ddb_entry *ddb = sess->dd_data;
1377
1378         sdev->hostdata = ddb;
1379         sdev->tagged_supported = 1;
1380         scsi_activate_tcq(sdev, sdev->host->can_queue);
1381         return 0;
1382 }
1383
1384 static int qla4xxx_slave_configure(struct scsi_device *sdev)
1385 {
1386         sdev->tagged_supported = 1;
1387         return 0;
1388 }
1389
1390 static void qla4xxx_slave_destroy(struct scsi_device *sdev)
1391 {
1392         scsi_deactivate_tcq(sdev, 1);
1393 }
1394
1395 /**
1396  * qla4xxx_del_from_active_array - returns an active srb
1397  * @ha: Pointer to host adapter structure.
1398  * @index: index into to the active_array
1399  *
1400  * This routine removes and returns the srb at the specified index
1401  **/
1402 struct srb * qla4xxx_del_from_active_array(struct scsi_qla_host *ha, uint32_t index)
1403 {
1404         struct srb *srb = NULL;
1405         struct scsi_cmnd *cmd;
1406
1407         if (!(cmd = scsi_host_find_tag(ha->host, index)))
1408                 return srb;
1409
1410         if (!(srb = (struct srb *)cmd->host_scribble))
1411                 return srb;
1412
1413         /* update counters */
1414         if (srb->flags & SRB_DMA_VALID) {
1415                 ha->req_q_count += srb->iocb_cnt;
1416                 ha->iocb_cnt -= srb->iocb_cnt;
1417                 if (srb->cmd)
1418                         srb->cmd->host_scribble = NULL;
1419         }
1420         return srb;
1421 }
1422
1423 /**
1424  * qla4xxx_eh_wait_on_command - waits for command to be returned by firmware
1425  * @ha: actual ha whose done queue will contain the comd returned by firmware.
1426  * @cmd: Scsi Command to wait on.
1427  *
1428  * This routine waits for the command to be returned by the Firmware
1429  * for some max time.
1430  **/
1431 static int qla4xxx_eh_wait_on_command(struct scsi_qla_host *ha,
1432                                       struct scsi_cmnd *cmd)
1433 {
1434         int done = 0;
1435         struct srb *rp;
1436         uint32_t max_wait_time = EH_WAIT_CMD_TOV;
1437
1438         do {
1439                 /* Checking to see if its returned to OS */
1440                 rp = (struct srb *) cmd->SCp.ptr;
1441                 if (rp == NULL) {
1442                         done++;
1443                         break;
1444                 }
1445
1446                 msleep(2000);
1447         } while (max_wait_time--);
1448
1449         return done;
1450 }
1451
1452 /**
1453  * qla4xxx_wait_for_hba_online - waits for HBA to come online
1454  * @ha: Pointer to host adapter structure
1455  **/
1456 static int qla4xxx_wait_for_hba_online(struct scsi_qla_host *ha)
1457 {
1458         unsigned long wait_online;
1459
1460         wait_online = jiffies + (30 * HZ);
1461         while (time_before(jiffies, wait_online)) {
1462
1463                 if (adapter_up(ha))
1464                         return QLA_SUCCESS;
1465                 else if (ha->retry_reset_ha_cnt == 0)
1466                         return QLA_ERROR;
1467
1468                 msleep(2000);
1469         }
1470
1471         return QLA_ERROR;
1472 }
1473
1474 /**
1475  * qla4xxx_eh_wait_for_active_target_commands - wait for active cmds to finish.
1476  * @ha: pointer to to HBA
1477  * @t: target id
1478  * @l: lun id
1479  *
1480  * This function waits for all outstanding commands to a lun to complete. It
1481  * returns 0 if all pending commands are returned and 1 otherwise.
1482  **/
1483 static int qla4xxx_eh_wait_for_active_target_commands(struct scsi_qla_host *ha,
1484                                                  int t, int l)
1485 {
1486         int cnt;
1487         int status = 0;
1488         struct scsi_cmnd *cmd;
1489
1490         /*
1491          * Waiting for all commands for the designated target in the active
1492          * array
1493          */
1494         for (cnt = 0; cnt < ha->host->can_queue; cnt++) {
1495                 cmd = scsi_host_find_tag(ha->host, cnt);
1496                 if (cmd && cmd->device->id == t && cmd->device->lun == l) {
1497                         if (!qla4xxx_eh_wait_on_command(ha, cmd)) {
1498                                 status++;
1499                                 break;
1500                         }
1501                 }
1502         }
1503         return status;
1504 }
1505
1506 /**
1507  * qla4xxx_eh_device_reset - callback for target reset.
1508  * @cmd: Pointer to Linux's SCSI command structure
1509  *
1510  * This routine is called by the Linux OS to reset all luns on the
1511  * specified target.
1512  **/
1513 static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd)
1514 {
1515         struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
1516         struct ddb_entry *ddb_entry = cmd->device->hostdata;
1517         struct srb *sp;
1518         int ret = FAILED, stat;
1519
1520         sp = (struct srb *) cmd->SCp.ptr;
1521         if (!sp || !ddb_entry)
1522                 return ret;
1523
1524         dev_info(&ha->pdev->dev,
1525                    "scsi%ld:%d:%d:%d: DEVICE RESET ISSUED.\n", ha->host_no,
1526                    cmd->device->channel, cmd->device->id, cmd->device->lun);
1527
1528         DEBUG2(printk(KERN_INFO
1529                       "scsi%ld: DEVICE_RESET cmd=%p jiffies = 0x%lx, to=%x,"
1530                       "dpc_flags=%lx, status=%x allowed=%d\n", ha->host_no,
1531                       cmd, jiffies, cmd->timeout_per_command / HZ,
1532                       ha->dpc_flags, cmd->result, cmd->allowed));
1533
1534         /* FIXME: wait for hba to go online */
1535         stat = qla4xxx_reset_lun(ha, ddb_entry, cmd->device->lun);
1536         if (stat != QLA_SUCCESS) {
1537                 dev_info(&ha->pdev->dev, "DEVICE RESET FAILED. %d\n", stat);
1538                 goto eh_dev_reset_done;
1539         }
1540
1541         /* Send marker. */
1542         ha->marker_needed = 1;
1543
1544         /*
1545          * If we are coming down the EH path, wait for all commands to complete
1546          * for the device.
1547          */
1548         if (cmd->device->host->shost_state == SHOST_RECOVERY) {
1549                 if (qla4xxx_eh_wait_for_active_target_commands(ha,
1550                                                           cmd->device->id,
1551                                                           cmd->device->lun)){
1552                         dev_info(&ha->pdev->dev,
1553                                    "DEVICE RESET FAILED - waiting for "
1554                                    "commands.\n");
1555                         goto eh_dev_reset_done;
1556                 }
1557         }
1558
1559         dev_info(&ha->pdev->dev,
1560                    "scsi(%ld:%d:%d:%d): DEVICE RESET SUCCEEDED.\n",
1561                    ha->host_no, cmd->device->channel, cmd->device->id,
1562                    cmd->device->lun);
1563
1564         ret = SUCCESS;
1565
1566 eh_dev_reset_done:
1567
1568         return ret;
1569 }
1570
1571 /**
1572  * qla4xxx_eh_host_reset - kernel callback
1573  * @cmd: Pointer to Linux's SCSI command structure
1574  *
1575  * This routine is invoked by the Linux kernel to perform fatal error
1576  * recovery on the specified adapter.
1577  **/
1578 static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd)
1579 {
1580         int return_status = FAILED;
1581         struct scsi_qla_host *ha;
1582
1583         ha = (struct scsi_qla_host *) cmd->device->host->hostdata;
1584
1585         dev_info(&ha->pdev->dev,
1586                    "scsi(%ld:%d:%d:%d): ADAPTER RESET ISSUED.\n", ha->host_no,
1587                    cmd->device->channel, cmd->device->id, cmd->device->lun);
1588
1589         if (qla4xxx_wait_for_hba_online(ha) != QLA_SUCCESS) {
1590                 DEBUG2(printk("scsi%ld:%d: %s: Unable to reset host.  Adapter "
1591                               "DEAD.\n", ha->host_no, cmd->device->channel,
1592                               __func__));
1593
1594                 return FAILED;
1595         }
1596
1597         if (qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST) == QLA_SUCCESS) {
1598                 return_status = SUCCESS;
1599         }
1600
1601         dev_info(&ha->pdev->dev, "HOST RESET %s.\n",
1602                    return_status == FAILED ? "FAILED" : "SUCCEDED");
1603
1604         return return_status;
1605 }
1606
1607
1608 static struct pci_device_id qla4xxx_pci_tbl[] = {
1609         {
1610                 .vendor         = PCI_VENDOR_ID_QLOGIC,
1611                 .device         = PCI_DEVICE_ID_QLOGIC_ISP4010,
1612                 .subvendor      = PCI_ANY_ID,
1613                 .subdevice      = PCI_ANY_ID,
1614         },
1615         {
1616                 .vendor         = PCI_VENDOR_ID_QLOGIC,
1617                 .device         = PCI_DEVICE_ID_QLOGIC_ISP4022,
1618                 .subvendor      = PCI_ANY_ID,
1619                 .subdevice      = PCI_ANY_ID,
1620         },
1621         {
1622                 .vendor         = PCI_VENDOR_ID_QLOGIC,
1623                 .device         = PCI_DEVICE_ID_QLOGIC_ISP4032,
1624                 .subvendor      = PCI_ANY_ID,
1625                 .subdevice      = PCI_ANY_ID,
1626         },
1627         {0, 0},
1628 };
1629 MODULE_DEVICE_TABLE(pci, qla4xxx_pci_tbl);
1630
1631 static struct pci_driver qla4xxx_pci_driver = {
1632         .name           = DRIVER_NAME,
1633         .id_table       = qla4xxx_pci_tbl,
1634         .probe          = qla4xxx_probe_adapter,
1635         .remove         = qla4xxx_remove_adapter,
1636 };
1637
1638 static int __init qla4xxx_module_init(void)
1639 {
1640         int ret;
1641
1642         /* Allocate cache for SRBs. */
1643         srb_cachep = kmem_cache_create("qla4xxx_srbs", sizeof(struct srb), 0,
1644                                        SLAB_HWCACHE_ALIGN, NULL, NULL);
1645         if (srb_cachep == NULL) {
1646                 printk(KERN_ERR
1647                        "%s: Unable to allocate SRB cache..."
1648                        "Failing load!\n", DRIVER_NAME);
1649                 ret = -ENOMEM;
1650                 goto no_srp_cache;
1651         }
1652
1653         /* Derive version string. */
1654         strcpy(qla4xxx_version_str, QLA4XXX_DRIVER_VERSION);
1655         if (ql4xextended_error_logging)
1656                 strcat(qla4xxx_version_str, "-debug");
1657
1658         qla4xxx_scsi_transport =
1659                 iscsi_register_transport(&qla4xxx_iscsi_transport);
1660         if (!qla4xxx_scsi_transport){
1661                 ret = -ENODEV;
1662                 goto release_srb_cache;
1663         }
1664
1665         ret = pci_register_driver(&qla4xxx_pci_driver);
1666         if (ret)
1667                 goto unregister_transport;
1668
1669         printk(KERN_INFO "QLogic iSCSI HBA Driver\n");
1670         return 0;
1671
1672 unregister_transport:
1673         iscsi_unregister_transport(&qla4xxx_iscsi_transport);
1674 release_srb_cache:
1675         kmem_cache_destroy(srb_cachep);
1676 no_srp_cache:
1677         return ret;
1678 }
1679
1680 static void __exit qla4xxx_module_exit(void)
1681 {
1682         ql4_mod_unload = 1;
1683         pci_unregister_driver(&qla4xxx_pci_driver);
1684         iscsi_unregister_transport(&qla4xxx_iscsi_transport);
1685         kmem_cache_destroy(srb_cachep);
1686 }
1687
1688 module_init(qla4xxx_module_init);
1689 module_exit(qla4xxx_module_exit);
1690
1691 MODULE_AUTHOR("QLogic Corporation");
1692 MODULE_DESCRIPTION("QLogic iSCSI HBA Driver");
1693 MODULE_LICENSE("GPL");
1694 MODULE_VERSION(QLA4XXX_DRIVER_VERSION);