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(struct Scsi_Host *shost,
  58                              enum iscsi_tgt_dscvr type, uint32_t enable,
  59                              struct sockaddr *dst_addr);
  60 static int qla4xxx_conn_get_param(struct iscsi_cls_conn *conn,
  61                                   enum iscsi_param param, char *buf);
  62 static int qla4xxx_sess_get_param(struct iscsi_cls_session *sess,
  63                                   enum iscsi_param param, char *buf);
  64 static int qla4xxx_host_get_param(struct Scsi_Host *shost,
  65                                   enum iscsi_host_param param, char *buf);
  66 static void qla4xxx_recovery_timedout(struct iscsi_cls_session *session);
  67
  68 /*
  69  * SCSI host template entry points
  70  */
  71 static int qla4xxx_queuecommand(struct scsi_cmnd *cmd,
  72                                 void (*done) (struct scsi_cmnd *));
  73 static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd);
  74 static int qla4xxx_eh_target_reset(struct scsi_cmnd *cmd);
  75 static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd);
  76 static int qla4xxx_slave_alloc(struct scsi_device *device);
  77 static int qla4xxx_slave_configure(struct scsi_device *device);
  78 static void qla4xxx_slave_destroy(struct scsi_device *sdev);
  79 static void qla4xxx_scan_start(struct Scsi_Host *shost);
  80
  81 static struct scsi_host_template qla4xxx_driver_template = {
  82         .module                 = THIS_MODULE,
  83         .name                   = DRIVER_NAME,
  84         .proc_name              = DRIVER_NAME,
  85         .queuecommand           = qla4xxx_queuecommand,
  86
  87         .eh_device_reset_handler = qla4xxx_eh_device_reset,
  88         .eh_target_reset_handler = qla4xxx_eh_target_reset,
  89         .eh_host_reset_handler  = qla4xxx_eh_host_reset,
  90
  91         .slave_configure        = qla4xxx_slave_configure,
  92         .slave_alloc            = qla4xxx_slave_alloc,
  93         .slave_destroy          = qla4xxx_slave_destroy,
  94
  95         .scan_finished          = iscsi_scan_finished,
  96         .scan_start             = qla4xxx_scan_start,
  97
  98         .this_id                = -1,
  99         .cmd_per_lun            = 3,
 100         .use_clustering         = ENABLE_CLUSTERING,
 101         .sg_tablesize           = SG_ALL,
 102
 103         .max_sectors            = 0xFFFF,
 104 };
 105
 106 static struct iscsi_transport qla4xxx_iscsi_transport = {
 107         .owner                  = THIS_MODULE,
 108         .name                   = DRIVER_NAME,
 109         .caps                   = CAP_FW_DB | CAP_SENDTARGETS_OFFLOAD |
 110                                   CAP_DATA_PATH_OFFLOAD,
 111         .param_mask             = ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS |
 112                                   ISCSI_TARGET_NAME | ISCSI_TPGT,
 113         .host_param_mask        = ISCSI_HOST_HWADDRESS |
 114                                   ISCSI_HOST_IPADDRESS |
 115                                   ISCSI_HOST_INITIATOR_NAME,
 116         .tgt_dscvr              = qla4xxx_tgt_dscvr,
 117         .get_conn_param         = qla4xxx_conn_get_param,
 118         .get_session_param      = qla4xxx_sess_get_param,
 119         .get_host_param         = qla4xxx_host_get_param,
 120         .session_recovery_timedout = qla4xxx_recovery_timedout,
 121 };
 122
 123 static struct scsi_transport_template *qla4xxx_scsi_transport;
 124
 125 static void qla4xxx_recovery_timedout(struct iscsi_cls_session *session)
 126 {
 127         struct ddb_entry *ddb_entry = session->dd_data;
 128         struct scsi_qla_host *ha = ddb_entry->ha;
 129
 130         if (atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
 131                 atomic_set(&ddb_entry->state, DDB_STATE_DEAD);
 132
 133                 DEBUG2(printk("scsi%ld: %s: index [%d] port down retry count "
 134                               "of (%d) secs exhausted, marking device DEAD.\n",
 135                               ha->host_no, __func__, ddb_entry->fw_ddb_index,
 136                               ha->port_down_retry_count));
 137
 138                 DEBUG2(printk("scsi%ld: %s: scheduling dpc routine - dpc "
 139                               "flags = 0x%lx\n",
 140                               ha->host_no, __func__, ha->dpc_flags));
 141                 queue_work(ha->dpc_thread, &ha->dpc_work);
 142         }
 143 }
 144
 145 static int qla4xxx_host_get_param(struct Scsi_Host *shost,
 146                                   enum iscsi_host_param param, char *buf)
 147 {
 148         struct scsi_qla_host *ha = to_qla_host(shost);
 149         int len;
 150
 151         switch (param) {
 152         case ISCSI_HOST_PARAM_HWADDRESS:
 153                 len = sysfs_format_mac(buf, ha->my_mac, MAC_ADDR_LEN);
 154                 break;
 155         case ISCSI_HOST_PARAM_IPADDRESS:
 156                 len = sprintf(buf, "%d.%d.%d.%d\n", ha->ip_address[0],
 157                               ha->ip_address[1], ha->ip_address[2],
 158                               ha->ip_address[3]);
 159                 break;
 160         case ISCSI_HOST_PARAM_INITIATOR_NAME:
 161                 len = sprintf(buf, "%s\n", ha->name_string);
 162                 break;
 163         default:
 164                 return -ENOSYS;
 165         }
 166
 167         return len;
 168 }
 169
 170 static int qla4xxx_sess_get_param(struct iscsi_cls_session *sess,
 171                                   enum iscsi_param param, char *buf)
 172 {
 173         struct ddb_entry *ddb_entry = sess->dd_data;
 174         int len;
 175
 176         switch (param) {
 177         case ISCSI_PARAM_TARGET_NAME:
 178                 len = snprintf(buf, PAGE_SIZE - 1, "%s\n",
 179                                ddb_entry->iscsi_name);
 180                 break;
 181         case ISCSI_PARAM_TPGT:
 182                 len = sprintf(buf, "%u\n", ddb_entry->tpgt);
 183                 break;
 184         default:
 185                 return -ENOSYS;
 186         }
 187
 188         return len;
 189 }
 190
 191 static int qla4xxx_conn_get_param(struct iscsi_cls_conn *conn,
 192                                   enum iscsi_param param, char *buf)
 193 {
 194         struct iscsi_cls_session *session;
 195         struct ddb_entry *ddb_entry;
 196         int len;
 197
 198         session = iscsi_dev_to_session(conn->dev.parent);
 199         ddb_entry = session->dd_data;
 200
 201         switch (param) {
 202         case ISCSI_PARAM_CONN_PORT:
 203                 len = sprintf(buf, "%hu\n", ddb_entry->port);
 204                 break;
 205         case ISCSI_PARAM_CONN_ADDRESS:
 206                 /* TODO: what are the ipv6 bits */
 207                 len = sprintf(buf, "%u.%u.%u.%u\n",
 208                               NIPQUAD(ddb_entry->ip_addr));
 209                 break;
 210         default:
 211                 return -ENOSYS;
 212         }
 213
 214         return len;
 215 }
 216
 217 static int qla4xxx_tgt_dscvr(struct Scsi_Host *shost,
 218                              enum iscsi_tgt_dscvr type, uint32_t enable,
 219                              struct sockaddr *dst_addr)
 220 {
 221         struct scsi_qla_host *ha;
 222         struct sockaddr_in *addr;
 223         struct sockaddr_in6 *addr6;
 224         int ret = 0;
 225
 226         ha = (struct scsi_qla_host *) shost->hostdata;
 227
 228         switch (type) {
 229         case ISCSI_TGT_DSCVR_SEND_TARGETS:
 230                 if (dst_addr->sa_family == AF_INET) {
 231                         addr = (struct sockaddr_in *)dst_addr;
 232                         if (qla4xxx_send_tgts(ha, (char *)&addr->sin_addr,
 233                                               addr->sin_port) != QLA_SUCCESS)
 234                                 ret = -EIO;
 235                 } else if (dst_addr->sa_family == AF_INET6) {
 236                         /*
 237                          * TODO: fix qla4xxx_send_tgts
 238                          */
 239                         addr6 = (struct sockaddr_in6 *)dst_addr;
 240                         if (qla4xxx_send_tgts(ha, (char *)&addr6->sin6_addr,
 241                                               addr6->sin6_port) != QLA_SUCCESS)
 242                                 ret = -EIO;
 243                 } else
 244                         ret = -ENOSYS;
 245                 break;
 246         default:
 247                 ret = -ENOSYS;
 248         }
 249         return ret;
 250 }
 251
 252 void qla4xxx_destroy_sess(struct ddb_entry *ddb_entry)
 253 {
 254         if (!ddb_entry->sess)
 255                 return;
 256
 257         if (ddb_entry->conn) {
 258                 atomic_set(&ddb_entry->state, DDB_STATE_DEAD);
 259                 iscsi_remove_session(ddb_entry->sess);
 260         }
 261         iscsi_free_session(ddb_entry->sess);
 262 }
 263
 264 int qla4xxx_add_sess(struct ddb_entry *ddb_entry)
 265 {
 266         int err;
 267
 268         ddb_entry->sess->recovery_tmo = ddb_entry->ha->port_down_retry_count;
 269         err = iscsi_add_session(ddb_entry->sess, ddb_entry->fw_ddb_index);
 270         if (err) {
 271                 DEBUG2(printk(KERN_ERR "Could not add session.\n"));
 272                 return err;
 273         }
 274
 275         ddb_entry->conn = iscsi_create_conn(ddb_entry->sess, 0, 0);
 276         if (!ddb_entry->conn) {
 277                 iscsi_remove_session(ddb_entry->sess);
 278                 DEBUG2(printk(KERN_ERR "Could not add connection.\n"));
 279                 return -ENOMEM;
 280         }
 281
 282         /* finally ready to go */
 283         iscsi_unblock_session(ddb_entry->sess);
 284         return 0;
 285 }
 286
 287 struct ddb_entry *qla4xxx_alloc_sess(struct scsi_qla_host *ha)
 288 {
 289         struct ddb_entry *ddb_entry;
 290         struct iscsi_cls_session *sess;
 291
 292         sess = iscsi_alloc_session(ha->host, &qla4xxx_iscsi_transport,
 293                                    sizeof(struct ddb_entry));
 294         if (!sess)
 295                 return NULL;
 296
 297         ddb_entry = sess->dd_data;
 298         memset(ddb_entry, 0, sizeof(*ddb_entry));
 299         ddb_entry->ha = ha;
 300         ddb_entry->sess = sess;
 301         return ddb_entry;
 302 }
 303
 304 static void qla4xxx_scan_start(struct Scsi_Host *shost)
 305 {
 306         struct scsi_qla_host *ha = shost_priv(shost);
 307         struct ddb_entry *ddb_entry, *ddbtemp;
 308
 309         /* finish setup of sessions that were already setup in firmware */
 310         list_for_each_entry_safe(ddb_entry, ddbtemp, &ha->ddb_list, list) {
 311                 if (ddb_entry->fw_ddb_device_state == DDB_DS_SESSION_ACTIVE)
 312                         qla4xxx_add_sess(ddb_entry);
 313         }
 314 }
 315
 316 /*
 317  * Timer routines
 318  */
 319
 320 static void qla4xxx_start_timer(struct scsi_qla_host *ha, void *func,
 321                                 unsigned long interval)
 322 {
 323         DEBUG(printk("scsi: %s: Starting timer thread for adapter %d\n",
 324                      __func__, ha->host->host_no));
 325         init_timer(&ha->timer);
 326         ha->timer.expires = jiffies + interval * HZ;
 327         ha->timer.data = (unsigned long)ha;
 328         ha->timer.function = (void (*)(unsigned long))func;
 329         add_timer(&ha->timer);
 330         ha->timer_active = 1;
 331 }
 332
 333 static void qla4xxx_stop_timer(struct scsi_qla_host *ha)
 334 {
 335         del_timer_sync(&ha->timer);
 336         ha->timer_active = 0;
 337 }
 338
 339 /***
 340  * qla4xxx_mark_device_missing - mark a device as missing.
 341  * @ha: Pointer to host adapter structure.
 342  * @ddb_entry: Pointer to device database entry
 343  *
 344  * This routine marks a device missing and resets the relogin retry count.
 345  **/
 346 void qla4xxx_mark_device_missing(struct scsi_qla_host *ha,
 347                                  struct ddb_entry *ddb_entry)
 348 {
 349         atomic_set(&ddb_entry->state, DDB_STATE_MISSING);
 350         DEBUG3(printk("scsi%d:%d:%d: index [%d] marked MISSING\n",
 351                       ha->host_no, ddb_entry->bus, ddb_entry->target,
 352                       ddb_entry->fw_ddb_index));
 353         iscsi_block_session(ddb_entry->sess);
 354         iscsi_conn_error(ddb_entry->conn, ISCSI_ERR_CONN_FAILED);
 355 }
 356
 357 static struct srb* qla4xxx_get_new_srb(struct scsi_qla_host *ha,
 358                                        struct ddb_entry *ddb_entry,
 359                                        struct scsi_cmnd *cmd,
 360                                        void (*done)(struct scsi_cmnd *))
 361 {
 362         struct srb *srb;
 363
 364         srb = mempool_alloc(ha->srb_mempool, GFP_ATOMIC);
 365         if (!srb)
 366                 return srb;
 367
 368         atomic_set(&srb->ref_count, 1);
 369         srb->ha = ha;
 370         srb->ddb = ddb_entry;
 371         srb->cmd = cmd;
 372         srb->flags = 0;
 373         cmd->SCp.ptr = (void *)srb;
 374         cmd->scsi_done = done;
 375
 376         return srb;
 377 }
 378
 379 static void qla4xxx_srb_free_dma(struct scsi_qla_host *ha, struct srb *srb)
 380 {
 381         struct scsi_cmnd *cmd = srb->cmd;
 382
 383         if (srb->flags & SRB_DMA_VALID) {
 384                 scsi_dma_unmap(cmd);
 385                 srb->flags &= ~SRB_DMA_VALID;
 386         }
 387         cmd->SCp.ptr = NULL;
 388 }
 389
 390 void qla4xxx_srb_compl(struct scsi_qla_host *ha, struct srb *srb)
 391 {
 392         struct scsi_cmnd *cmd = srb->cmd;
 393
 394         qla4xxx_srb_free_dma(ha, srb);
 395
 396         mempool_free(srb, ha->srb_mempool);
 397
 398         cmd->scsi_done(cmd);
 399 }
 400
 401 /**
 402  * qla4xxx_queuecommand - scsi layer issues scsi command to driver.
 403  * @cmd: Pointer to Linux's SCSI command structure
 404  * @done_fn: Function that the driver calls to notify the SCSI mid-layer
 405  *      that the command has been processed.
 406  *
 407  * Remarks:
 408  * This routine is invoked by Linux to send a SCSI command to the driver.
 409  * The mid-level driver tries to ensure that queuecommand never gets
 410  * invoked concurrently with itself or the interrupt handler (although
 411  * the interrupt handler may call this routine as part of request-
 412  * completion handling).   Unfortunely, it sometimes calls the scheduler
 413  * in interrupt context which is a big NO! NO!.
 414  **/
 415 static int qla4xxx_queuecommand(struct scsi_cmnd *cmd,
 416                                 void (*done)(struct scsi_cmnd *))
 417 {
 418         struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
 419         struct ddb_entry *ddb_entry = cmd->device->hostdata;
 420         struct iscsi_cls_session *sess = ddb_entry->sess;
 421         struct srb *srb;
 422         int rval;
 423
 424         if (!sess) {
 425                 cmd->result = DID_IMM_RETRY << 16;
 426                 goto qc_fail_command;
 427         }
 428
 429         rval = iscsi_session_chkready(sess);
 430         if (rval) {
 431                 cmd->result = rval;
 432                 goto qc_fail_command;
 433         }
 434
 435         if (atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
 436                 if (atomic_read(&ddb_entry->state) == DDB_STATE_DEAD) {
 437                         cmd->result = DID_NO_CONNECT << 16;
 438                         goto qc_fail_command;
 439                 }
 440                 goto qc_host_busy;
 441         }
 442
 443         if (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags))
 444                 goto qc_host_busy;
 445
 446         spin_unlock_irq(ha->host->host_lock);
 447
 448         srb = qla4xxx_get_new_srb(ha, ddb_entry, cmd, done);
 449         if (!srb)
 450                 goto qc_host_busy_lock;
 451
 452         rval = qla4xxx_send_command_to_isp(ha, srb);
 453         if (rval != QLA_SUCCESS)
 454                 goto qc_host_busy_free_sp;
 455
 456         spin_lock_irq(ha->host->host_lock);
 457         return 0;
 458
 459 qc_host_busy_free_sp:
 460         qla4xxx_srb_free_dma(ha, srb);
 461         mempool_free(srb, ha->srb_mempool);
 462
 463 qc_host_busy_lock:
 464         spin_lock_irq(ha->host->host_lock);
 465
 466 qc_host_busy:
 467         return SCSI_MLQUEUE_HOST_BUSY;
 468
 469 qc_fail_command:
 470         done(cmd);
 471
 472         return 0;
 473 }
 474
 475 /**
 476  * qla4xxx_mem_free - frees memory allocated to adapter
 477  * @ha: Pointer to host adapter structure.
 478  *
 479  * Frees memory previously allocated by qla4xxx_mem_alloc
 480  **/
 481 static void qla4xxx_mem_free(struct scsi_qla_host *ha)
 482 {
 483         if (ha->queues)
 484                 dma_free_coherent(&ha->pdev->dev, ha->queues_len, ha->queues,
 485                                   ha->queues_dma);
 486
 487         ha->queues_len = 0;
 488         ha->queues = NULL;
 489         ha->queues_dma = 0;
 490         ha->request_ring = NULL;
 491         ha->request_dma = 0;
 492         ha->response_ring = NULL;
 493         ha->response_dma = 0;
 494         ha->shadow_regs = NULL;
 495         ha->shadow_regs_dma = 0;
 496
 497         /* Free srb pool. */
 498         if (ha->srb_mempool)
 499                 mempool_destroy(ha->srb_mempool);
 500
 501         ha->srb_mempool = NULL;
 502
 503         /* release io space registers  */
 504         if (ha->reg)
 505                 iounmap(ha->reg);
 506         pci_release_regions(ha->pdev);
 507 }
 508
 509 /**
 510  * qla4xxx_mem_alloc - allocates memory for use by adapter.
 511  * @ha: Pointer to host adapter structure
 512  *
 513  * Allocates DMA memory for request and response queues. Also allocates memory
 514  * for srbs.
 515  **/
 516 static int qla4xxx_mem_alloc(struct scsi_qla_host *ha)
 517 {
 518         unsigned long align;
 519
 520         /* Allocate contiguous block of DMA memory for queues. */
 521         ha->queues_len = ((REQUEST_QUEUE_DEPTH * QUEUE_SIZE) +
 522                           (RESPONSE_QUEUE_DEPTH * QUEUE_SIZE) +
 523                           sizeof(struct shadow_regs) +
 524                           MEM_ALIGN_VALUE +
 525                           (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
 526         ha->queues = dma_alloc_coherent(&ha->pdev->dev, ha->queues_len,
 527                                         &ha->queues_dma, GFP_KERNEL);
 528         if (ha->queues == NULL) {
 529                 dev_warn(&ha->pdev->dev,
 530                         "Memory Allocation failed - queues.\n");
 531
 532                 goto mem_alloc_error_exit;
 533         }
 534         memset(ha->queues, 0, ha->queues_len);
 535
 536         /*
 537          * As per RISC alignment requirements -- the bus-address must be a
 538          * multiple of the request-ring size (in bytes).
 539          */
 540         align = 0;
 541         if ((unsigned long)ha->queues_dma & (MEM_ALIGN_VALUE - 1))
 542                 align = MEM_ALIGN_VALUE - ((unsigned long)ha->queues_dma &
 543                                            (MEM_ALIGN_VALUE - 1));
 544
 545         /* Update request and response queue pointers. */
 546         ha->request_dma = ha->queues_dma + align;
 547         ha->request_ring = (struct queue_entry *) (ha->queues + align);
 548         ha->response_dma = ha->queues_dma + align +
 549                 (REQUEST_QUEUE_DEPTH * QUEUE_SIZE);
 550         ha->response_ring = (struct queue_entry *) (ha->queues + align +
 551                                                     (REQUEST_QUEUE_DEPTH *
 552                                                      QUEUE_SIZE));
 553         ha->shadow_regs_dma = ha->queues_dma + align +
 554                 (REQUEST_QUEUE_DEPTH * QUEUE_SIZE) +
 555                 (RESPONSE_QUEUE_DEPTH * QUEUE_SIZE);
 556         ha->shadow_regs = (struct shadow_regs *) (ha->queues + align +
 557                                                   (REQUEST_QUEUE_DEPTH *
 558                                                    QUEUE_SIZE) +
 559                                                   (RESPONSE_QUEUE_DEPTH *
 560                                                    QUEUE_SIZE));
 561
 562         /* Allocate memory for srb pool. */
 563         ha->srb_mempool = mempool_create(SRB_MIN_REQ, mempool_alloc_slab,
 564                                          mempool_free_slab, srb_cachep);
 565         if (ha->srb_mempool == NULL) {
 566                 dev_warn(&ha->pdev->dev,
 567                         "Memory Allocation failed - SRB Pool.\n");
 568
 569                 goto mem_alloc_error_exit;
 570         }
 571
 572         return QLA_SUCCESS;
 573
 574 mem_alloc_error_exit:
 575         qla4xxx_mem_free(ha);
 576         return QLA_ERROR;
 577 }
 578
 579 /**
 580  * qla4xxx_timer - checks every second for work to do.
 581  * @ha: Pointer to host adapter structure.
 582  **/
 583 static void qla4xxx_timer(struct scsi_qla_host *ha)
 584 {
 585         struct ddb_entry *ddb_entry, *dtemp;
 586         int start_dpc = 0;
 587
 588         /* Search for relogin's to time-out and port down retry. */
 589         list_for_each_entry_safe(ddb_entry, dtemp, &ha->ddb_list, list) {
 590                 /* Count down time between sending relogins */
 591                 if (adapter_up(ha) &&
 592                     !test_bit(DF_RELOGIN, &ddb_entry->flags) &&
 593                     atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
 594                         if (atomic_read(&ddb_entry->retry_relogin_timer) !=
 595                             INVALID_ENTRY) {
 596                                 if (atomic_read(&ddb_entry->retry_relogin_timer)
 597                                                 == 0) {
 598                                         atomic_set(&ddb_entry->
 599                                                 retry_relogin_timer,
 600                                                 INVALID_ENTRY);
 601                                         set_bit(DPC_RELOGIN_DEVICE,
 602                                                 &ha->dpc_flags);
 603                                         set_bit(DF_RELOGIN, &ddb_entry->flags);
 604                                         DEBUG2(printk("scsi%ld: %s: index [%d]"
 605                                                       " login device\n",
 606                                                       ha->host_no, __func__,
 607                                                       ddb_entry->fw_ddb_index));
 608                                 } else
 609                                         atomic_dec(&ddb_entry->
 610                                                         retry_relogin_timer);
 611                         }
 612                 }
 613
 614                 /* Wait for relogin to timeout */
 615                 if (atomic_read(&ddb_entry->relogin_timer) &&
 616                     (atomic_dec_and_test(&ddb_entry->relogin_timer) != 0)) {
 617                         /*
 618                          * If the relogin times out and the device is
 619                          * still NOT ONLINE then try and relogin again.
 620                          */
 621                         if (atomic_read(&ddb_entry->state) !=
 622                             DDB_STATE_ONLINE &&
 623                             ddb_entry->fw_ddb_device_state ==
 624                             DDB_DS_SESSION_FAILED) {
 625                                 /* Reset retry relogin timer */
 626                                 atomic_inc(&ddb_entry->relogin_retry_count);
 627                                 DEBUG2(printk("scsi%ld: index[%d] relogin"
 628                                               " timed out-retrying"
 629                                               " relogin (%d)\n",
 630                                               ha->host_no,
 631                                               ddb_entry->fw_ddb_index,
 632                                               atomic_read(&ddb_entry->
 633                                                           relogin_retry_count))
 634                                         );
 635                                 start_dpc++;
 636                                 DEBUG(printk("scsi%ld:%d:%d: index [%d] "
 637                                              "initate relogin after"
 638                                              " %d seconds\n",
 639                                              ha->host_no, ddb_entry->bus,
 640                                              ddb_entry->target,
 641                                              ddb_entry->fw_ddb_index,
 642                                              ddb_entry->default_time2wait + 4)
 643                                         );
 644
 645                                 atomic_set(&ddb_entry->retry_relogin_timer,
 646                                            ddb_entry->default_time2wait + 4);
 647                         }
 648                 }
 649         }
 650
 651         /* Check for heartbeat interval. */
 652         if (ha->firmware_options & FWOPT_HEARTBEAT_ENABLE &&
 653             ha->heartbeat_interval != 0) {
 654                 ha->seconds_since_last_heartbeat++;
 655                 if (ha->seconds_since_last_heartbeat >
 656                     ha->heartbeat_interval + 2)
 657                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 658         }
 659
 660
 661         /* Wakeup the dpc routine for this adapter, if needed. */
 662         if ((start_dpc ||
 663              test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
 664              test_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags) ||
 665              test_bit(DPC_RELOGIN_DEVICE, &ha->dpc_flags) ||
 666              test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags) ||
 667              test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags) ||
 668              test_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags) ||
 669              test_bit(DPC_AEN, &ha->dpc_flags)) &&
 670              ha->dpc_thread) {
 671                 DEBUG2(printk("scsi%ld: %s: scheduling dpc routine"
 672                               " - dpc flags = 0x%lx\n",
 673                               ha->host_no, __func__, ha->dpc_flags));
 674                 queue_work(ha->dpc_thread, &ha->dpc_work);
 675         }
 676
 677         /* Reschedule timer thread to call us back in one second */
 678         mod_timer(&ha->timer, jiffies + HZ);
 679
 680         DEBUG2(ha->seconds_since_last_intr++);
 681 }
 682
 683 /**
 684  * qla4xxx_cmd_wait - waits for all outstanding commands to complete
 685  * @ha: Pointer to host adapter structure.
 686  *
 687  * This routine stalls the driver until all outstanding commands are returned.
 688  * Caller must release the Hardware Lock prior to calling this routine.
 689  **/
 690 static int qla4xxx_cmd_wait(struct scsi_qla_host *ha)
 691 {
 692         uint32_t index = 0;
 693         int stat = QLA_SUCCESS;
 694         unsigned long flags;
 695         struct scsi_cmnd *cmd;
 696         int wait_cnt = WAIT_CMD_TOV;    /*
 697                                          * Initialized for 30 seconds as we
 698                                          * expect all commands to retuned
 699                                          * ASAP.
 700                                          */
 701
 702         while (wait_cnt) {
 703                 spin_lock_irqsave(&ha->hardware_lock, flags);
 704                 /* Find a command that hasn't completed. */
 705                 for (index = 0; index < ha->host->can_queue; index++) {
 706                         cmd = scsi_host_find_tag(ha->host, index);
 707                         if (cmd != NULL)
 708                                 break;
 709                 }
 710                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 711
 712                 /* If No Commands are pending, wait is complete */
 713                 if (index == ha->host->can_queue) {
 714                         break;
 715                 }
 716
 717                 /* If we timed out on waiting for commands to come back
 718                  * return ERROR.
 719                  */
 720                 wait_cnt--;
 721                 if (wait_cnt == 0)
 722                         stat = QLA_ERROR;
 723                 else {
 724                         msleep(1000);
 725                 }
 726         }                       /* End of While (wait_cnt) */
 727
 728         return stat;
 729 }
 730
 731 void qla4xxx_hw_reset(struct scsi_qla_host *ha)
 732 {
 733         uint32_t ctrl_status;
 734         unsigned long flags = 0;
 735
 736         DEBUG2(printk(KERN_ERR "scsi%ld: %s\n", ha->host_no, __func__));
 737
 738         spin_lock_irqsave(&ha->hardware_lock, flags);
 739
 740         /*
 741          * If the SCSI Reset Interrupt bit is set, clear it.
 742          * Otherwise, the Soft Reset won't work.
 743          */
 744         ctrl_status = readw(&ha->reg->ctrl_status);
 745         if ((ctrl_status & CSR_SCSI_RESET_INTR) != 0)
 746                 writel(set_rmask(CSR_SCSI_RESET_INTR), &ha->reg->ctrl_status);
 747
 748         /* Issue Soft Reset */
 749         writel(set_rmask(CSR_SOFT_RESET), &ha->reg->ctrl_status);
 750         readl(&ha->reg->ctrl_status);
 751
 752         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 753 }
 754
 755 /**
 756  * qla4xxx_soft_reset - performs soft reset.
 757  * @ha: Pointer to host adapter structure.
 758  **/
 759 int qla4xxx_soft_reset(struct scsi_qla_host *ha)
 760 {
 761         uint32_t max_wait_time;
 762         unsigned long flags = 0;
 763         int status = QLA_ERROR;
 764         uint32_t ctrl_status;
 765
 766         qla4xxx_hw_reset(ha);
 767
 768         /* Wait until the Network Reset Intr bit is cleared */
 769         max_wait_time = RESET_INTR_TOV;
 770         do {
 771                 spin_lock_irqsave(&ha->hardware_lock, flags);
 772                 ctrl_status = readw(&ha->reg->ctrl_status);
 773                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 774
 775                 if ((ctrl_status & CSR_NET_RESET_INTR) == 0)
 776                         break;
 777
 778                 msleep(1000);
 779         } while ((--max_wait_time));
 780
 781         if ((ctrl_status & CSR_NET_RESET_INTR) != 0) {
 782                 DEBUG2(printk(KERN_WARNING
 783                               "scsi%ld: Network Reset Intr not cleared by "
 784                               "Network function, clearing it now!\n",
 785                               ha->host_no));
 786                 spin_lock_irqsave(&ha->hardware_lock, flags);
 787                 writel(set_rmask(CSR_NET_RESET_INTR), &ha->reg->ctrl_status);
 788                 readl(&ha->reg->ctrl_status);
 789                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 790         }
 791
 792         /* Wait until the firmware tells us the Soft Reset is done */
 793         max_wait_time = SOFT_RESET_TOV;
 794         do {
 795                 spin_lock_irqsave(&ha->hardware_lock, flags);
 796                 ctrl_status = readw(&ha->reg->ctrl_status);
 797                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 798
 799                 if ((ctrl_status & CSR_SOFT_RESET) == 0) {
 800                         status = QLA_SUCCESS;
 801                         break;
 802                 }
 803
 804                 msleep(1000);
 805         } while ((--max_wait_time));
 806
 807         /*
 808          * Also, make sure that the SCSI Reset Interrupt bit has been cleared
 809          * after the soft reset has taken place.
 810          */
 811         spin_lock_irqsave(&ha->hardware_lock, flags);
 812         ctrl_status = readw(&ha->reg->ctrl_status);
 813         if ((ctrl_status & CSR_SCSI_RESET_INTR) != 0) {
 814                 writel(set_rmask(CSR_SCSI_RESET_INTR), &ha->reg->ctrl_status);
 815                 readl(&ha->reg->ctrl_status);
 816         }
 817         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 818
 819         /* If soft reset fails then most probably the bios on other
 820          * function is also enabled.
 821          * Since the initialization is sequential the other fn
 822          * wont be able to acknowledge the soft reset.
 823          * Issue a force soft reset to workaround this scenario.
 824          */
 825         if (max_wait_time == 0) {
 826                 /* Issue Force Soft Reset */
 827                 spin_lock_irqsave(&ha->hardware_lock, flags);
 828                 writel(set_rmask(CSR_FORCE_SOFT_RESET), &ha->reg->ctrl_status);
 829                 readl(&ha->reg->ctrl_status);
 830                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 831                 /* Wait until the firmware tells us the Soft Reset is done */
 832                 max_wait_time = SOFT_RESET_TOV;
 833                 do {
 834                         spin_lock_irqsave(&ha->hardware_lock, flags);
 835                         ctrl_status = readw(&ha->reg->ctrl_status);
 836                         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 837
 838                         if ((ctrl_status & CSR_FORCE_SOFT_RESET) == 0) {
 839                                 status = QLA_SUCCESS;
 840                                 break;
 841                         }
 842
 843                         msleep(1000);
 844                 } while ((--max_wait_time));
 845         }
 846
 847         return status;
 848 }
 849
 850 /**
 851  * qla4xxx_flush_active_srbs - returns all outstanding i/o requests to O.S.
 852  * @ha: Pointer to host adapter structure.
 853  *
 854  * This routine is called just prior to a HARD RESET to return all
 855  * outstanding commands back to the Operating System.
 856  * Caller should make sure that the following locks are released
 857  * before this calling routine: Hardware lock, and io_request_lock.
 858  **/
 859 static void qla4xxx_flush_active_srbs(struct scsi_qla_host *ha)
 860 {
 861         struct srb *srb;
 862         int i;
 863         unsigned long flags;
 864
 865         spin_lock_irqsave(&ha->hardware_lock, flags);
 866         for (i = 0; i < ha->host->can_queue; i++) {
 867                 srb = qla4xxx_del_from_active_array(ha, i);
 868                 if (srb != NULL) {
 869                         srb->cmd->result = DID_RESET << 16;
 870                         qla4xxx_srb_compl(ha, srb);
 871                 }
 872         }
 873         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 874
 875 }
 876
 877 /**
 878  * qla4xxx_recover_adapter - recovers adapter after a fatal error
 879  * @ha: Pointer to host adapter structure.
 880  * @renew_ddb_list: Indicates what to do with the adapter's ddb list
 881  *
 882  * renew_ddb_list value can be 0=preserve ddb list, 1=destroy and rebuild
 883  * ddb list.
 884  **/
 885 static int qla4xxx_recover_adapter(struct scsi_qla_host *ha,
 886                                 uint8_t renew_ddb_list)
 887 {
 888         int status;
 889
 890         /* Stall incoming I/O until we are done */
 891         clear_bit(AF_ONLINE, &ha->flags);
 892
 893         DEBUG2(printk("scsi%ld: %s calling qla4xxx_cmd_wait\n", ha->host_no,
 894                       __func__));
 895
 896         /* Wait for outstanding commands to complete.
 897          * Stalls the driver for max 30 secs
 898          */
 899         status = qla4xxx_cmd_wait(ha);
 900
 901         qla4xxx_disable_intrs(ha);
 902
 903         /* Flush any pending ddb changed AENs */
 904         qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
 905
 906         /* Reset the firmware.  If successful, function
 907          * returns with ISP interrupts enabled.
 908          */
 909         if (status == QLA_SUCCESS) {
 910                 DEBUG2(printk("scsi%ld: %s - Performing soft reset..\n",
 911                               ha->host_no, __func__));
 912                 qla4xxx_flush_active_srbs(ha);
 913                 if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS)
 914                         status = qla4xxx_soft_reset(ha);
 915                 else
 916                         status = QLA_ERROR;
 917         }
 918
 919         /* Flush any pending ddb changed AENs */
 920         qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
 921
 922         /* Re-initialize firmware. If successful, function returns
 923          * with ISP interrupts enabled */
 924         if (status == QLA_SUCCESS) {
 925                 DEBUG2(printk("scsi%ld: %s - Initializing adapter..\n",
 926                               ha->host_no, __func__));
 927
 928                 /* If successful, AF_ONLINE flag set in
 929                  * qla4xxx_initialize_adapter */
 930                 status = qla4xxx_initialize_adapter(ha, renew_ddb_list);
 931         }
 932
 933         /* Failed adapter initialization?
 934          * Retry reset_ha only if invoked via DPC (DPC_RESET_HA) */
 935         if ((test_bit(AF_ONLINE, &ha->flags) == 0) &&
 936             (test_bit(DPC_RESET_HA, &ha->dpc_flags))) {
 937                 /* Adapter initialization failed, see if we can retry
 938                  * resetting the ha */
 939                 if (!test_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags)) {
 940                         ha->retry_reset_ha_cnt = MAX_RESET_HA_RETRIES;
 941                         DEBUG2(printk("scsi%ld: recover adapter - retrying "
 942                                       "(%d) more times\n", ha->host_no,
 943                                       ha->retry_reset_ha_cnt));
 944                         set_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
 945                         status = QLA_ERROR;
 946                 } else {
 947                         if (ha->retry_reset_ha_cnt > 0) {
 948                                 /* Schedule another Reset HA--DPC will retry */
 949                                 ha->retry_reset_ha_cnt--;
 950                                 DEBUG2(printk("scsi%ld: recover adapter - "
 951                                               "retry remaining %d\n",
 952                                               ha->host_no,
 953                                               ha->retry_reset_ha_cnt));
 954                                 status = QLA_ERROR;
 955                         }
 956
 957                         if (ha->retry_reset_ha_cnt == 0) {
 958                                 /* Recover adapter retries have been exhausted.
 959                                  * Adapter DEAD */
 960                                 DEBUG2(printk("scsi%ld: recover adapter "
 961                                               "failed - board disabled\n",
 962                                               ha->host_no));
 963                                 qla4xxx_flush_active_srbs(ha);
 964                                 clear_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
 965                                 clear_bit(DPC_RESET_HA, &ha->dpc_flags);
 966                                 clear_bit(DPC_RESET_HA_DESTROY_DDB_LIST,
 967                                           &ha->dpc_flags);
 968                                 status = QLA_ERROR;
 969                         }
 970                 }
 971         } else {
 972                 clear_bit(DPC_RESET_HA, &ha->dpc_flags);
 973                 clear_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags);
 974                 clear_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
 975         }
 976
 977         ha->adapter_error_count++;
 978
 979         if (status == QLA_SUCCESS)
 980                 qla4xxx_enable_intrs(ha);
 981
 982         DEBUG2(printk("scsi%ld: recover adapter .. DONE\n", ha->host_no));
 983         return status;
 984 }
 985
 986 /**
 987  * qla4xxx_do_dpc - dpc routine
 988  * @data: in our case pointer to adapter structure
 989  *
 990  * This routine is a task that is schedule by the interrupt handler
 991  * to perform the background processing for interrupts.  We put it
 992  * on a task queue that is consumed whenever the scheduler runs; that's
 993  * so you can do anything (i.e. put the process to sleep etc).  In fact,
 994  * the mid-level tries to sleep when it reaches the driver threshold
 995  * "host->can_queue". This can cause a panic if we were in our interrupt code.
 996  **/
 997 static void qla4xxx_do_dpc(struct work_struct *work)
 998 {
 999         struct scsi_qla_host *ha =
1000                 container_of(work, struct scsi_qla_host, dpc_work);
1001         struct ddb_entry *ddb_entry, *dtemp;
1002         int status = QLA_ERROR;
1003
1004         DEBUG2(printk("scsi%ld: %s: DPC handler waking up."
1005                 "flags = 0x%08lx, dpc_flags = 0x%08lx ctrl_stat = 0x%08x\n",
1006                 ha->host_no, __func__, ha->flags, ha->dpc_flags,
1007                 readw(&ha->reg->ctrl_status)));
1008
1009         /* Initialization not yet finished. Don't do anything yet. */
1010         if (!test_bit(AF_INIT_DONE, &ha->flags))
1011                 return;
1012
1013         if (adapter_up(ha) ||
1014             test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
1015             test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags) ||
1016             test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags)) {
1017                 if (test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags) ||
1018                         test_bit(DPC_RESET_HA, &ha->dpc_flags))
1019                         qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST);
1020
1021                 if (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags)) {
1022                         uint8_t wait_time = RESET_INTR_TOV;
1023
1024                         while ((readw(&ha->reg->ctrl_status) &
1025                                 (CSR_SOFT_RESET | CSR_FORCE_SOFT_RESET)) != 0) {
1026                                 if (--wait_time == 0)
1027                                         break;
1028                                 msleep(1000);
1029                         }
1030                         if (wait_time == 0)
1031                                 DEBUG2(printk("scsi%ld: %s: SR|FSR "
1032                                               "bit not cleared-- resetting\n",
1033                                               ha->host_no, __func__));
1034                         qla4xxx_flush_active_srbs(ha);
1035                         if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS) {
1036                                 qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
1037                                 status = qla4xxx_initialize_adapter(ha,
1038                                                 PRESERVE_DDB_LIST);
1039                         }
1040                         clear_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
1041                         if (status == QLA_SUCCESS)
1042                                 qla4xxx_enable_intrs(ha);
1043                 }
1044         }
1045
1046         /* ---- process AEN? --- */
1047         if (test_and_clear_bit(DPC_AEN, &ha->dpc_flags))
1048                 qla4xxx_process_aen(ha, PROCESS_ALL_AENS);
1049
1050         /* ---- Get DHCP IP Address? --- */
1051         if (test_and_clear_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags))
1052                 qla4xxx_get_dhcp_ip_address(ha);
1053
1054         /* ---- relogin device? --- */
1055         if (adapter_up(ha) &&
1056             test_and_clear_bit(DPC_RELOGIN_DEVICE, &ha->dpc_flags)) {
1057                 list_for_each_entry_safe(ddb_entry, dtemp,
1058                                          &ha->ddb_list, list) {
1059                         if (test_and_clear_bit(DF_RELOGIN, &ddb_entry->flags) &&
1060                             atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE)
1061                                 qla4xxx_relogin_device(ha, ddb_entry);
1062
1063                         /*
1064                          * If mbx cmd times out there is no point
1065                          * in continuing further.
1066                          * With large no of targets this can hang
1067                          * the system.
1068                          */
1069                         if (test_bit(DPC_RESET_HA, &ha->dpc_flags)) {
1070                                 printk(KERN_WARNING "scsi%ld: %s: "
1071                                        "need to reset hba\n",
1072                                        ha->host_no, __func__);
1073                                 break;
1074                         }
1075                 }
1076         }
1077 }
1078
1079 /**
1080  * qla4xxx_free_adapter - release the adapter
1081  * @ha: pointer to adapter structure
1082  **/
1083 static void qla4xxx_free_adapter(struct scsi_qla_host *ha)
1084 {
1085
1086         if (test_bit(AF_INTERRUPTS_ON, &ha->flags)) {
1087                 /* Turn-off interrupts on the card. */
1088                 qla4xxx_disable_intrs(ha);
1089         }
1090
1091         /* Kill the kernel thread for this host */
1092         if (ha->dpc_thread)
1093                 destroy_workqueue(ha->dpc_thread);
1094
1095         /* Issue Soft Reset to put firmware in unknown state */
1096         if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS)
1097                 qla4xxx_hw_reset(ha);
1098
1099         /* Remove timer thread, if present */
1100         if (ha->timer_active)
1101                 qla4xxx_stop_timer(ha);
1102
1103         /* Detach interrupts */
1104         if (test_and_clear_bit(AF_IRQ_ATTACHED, &ha->flags))
1105                 free_irq(ha->pdev->irq, ha);
1106
1107         /* free extra memory */
1108         qla4xxx_mem_free(ha);
1109
1110         pci_disable_device(ha->pdev);
1111
1112 }
1113
1114 /***
1115  * qla4xxx_iospace_config - maps registers
1116  * @ha: pointer to adapter structure
1117  *
1118  * This routines maps HBA's registers from the pci address space
1119  * into the kernel virtual address space for memory mapped i/o.
1120  **/
1121 static int qla4xxx_iospace_config(struct scsi_qla_host *ha)
1122 {
1123         unsigned long pio, pio_len, pio_flags;
1124         unsigned long mmio, mmio_len, mmio_flags;
1125
1126         pio = pci_resource_start(ha->pdev, 0);
1127         pio_len = pci_resource_len(ha->pdev, 0);
1128         pio_flags = pci_resource_flags(ha->pdev, 0);
1129         if (pio_flags & IORESOURCE_IO) {
1130                 if (pio_len < MIN_IOBASE_LEN) {
1131                         dev_warn(&ha->pdev->dev,
1132                                 "Invalid PCI I/O region size\n");
1133                         pio = 0;
1134                 }
1135         } else {
1136                 dev_warn(&ha->pdev->dev, "region #0 not a PIO resource\n");
1137                 pio = 0;
1138         }
1139
1140         /* Use MMIO operations for all accesses. */
1141         mmio = pci_resource_start(ha->pdev, 1);
1142         mmio_len = pci_resource_len(ha->pdev, 1);
1143         mmio_flags = pci_resource_flags(ha->pdev, 1);
1144
1145         if (!(mmio_flags & IORESOURCE_MEM)) {
1146                 dev_err(&ha->pdev->dev,
1147                         "region #0 not an MMIO resource, aborting\n");
1148
1149                 goto iospace_error_exit;
1150         }
1151         if (mmio_len < MIN_IOBASE_LEN) {
1152                 dev_err(&ha->pdev->dev,
1153                         "Invalid PCI mem region size, aborting\n");
1154                 goto iospace_error_exit;
1155         }
1156
1157         if (pci_request_regions(ha->pdev, DRIVER_NAME)) {
1158                 dev_warn(&ha->pdev->dev,
1159                         "Failed to reserve PIO/MMIO regions\n");
1160
1161                 goto iospace_error_exit;
1162         }
1163
1164         ha->pio_address = pio;
1165         ha->pio_length = pio_len;
1166         ha->reg = ioremap(mmio, MIN_IOBASE_LEN);
1167         if (!ha->reg) {
1168                 dev_err(&ha->pdev->dev,
1169                         "cannot remap MMIO, aborting\n");
1170
1171                 goto iospace_error_exit;
1172         }
1173
1174         return 0;
1175
1176 iospace_error_exit:
1177         return -ENOMEM;
1178 }
1179
1180 /**
1181  * qla4xxx_probe_adapter - callback function to probe HBA
1182  * @pdev: pointer to pci_dev structure
1183  * @pci_device_id: pointer to pci_device entry
1184  *
1185  * This routine will probe for Qlogic 4xxx iSCSI host adapters.
1186  * It returns zero if successful. It also initializes all data necessary for
1187  * the driver.
1188  **/
1189 static int __devinit qla4xxx_probe_adapter(struct pci_dev *pdev,
1190                                            const struct pci_device_id *ent)
1191 {
1192         int ret = -ENODEV, status;
1193         struct Scsi_Host *host;
1194         struct scsi_qla_host *ha;
1195         uint8_t init_retry_count = 0;
1196         char buf[34];
1197
1198         if (pci_enable_device(pdev))
1199                 return -1;
1200
1201         host = scsi_host_alloc(&qla4xxx_driver_template, sizeof(*ha));
1202         if (host == NULL) {
1203                 printk(KERN_WARNING
1204                        "qla4xxx: Couldn't allocate host from scsi layer!\n");
1205                 goto probe_disable_device;
1206         }
1207
1208         /* Clear our data area */
1209         ha = (struct scsi_qla_host *) host->hostdata;
1210         memset(ha, 0, sizeof(*ha));
1211
1212         /* Save the information from PCI BIOS.  */
1213         ha->pdev = pdev;
1214         ha->host = host;
1215         ha->host_no = host->host_no;
1216
1217         /* Configure PCI I/O space. */
1218         ret = qla4xxx_iospace_config(ha);
1219         if (ret)
1220                 goto probe_failed;
1221
1222         dev_info(&ha->pdev->dev, "Found an ISP%04x, irq %d, iobase 0x%p\n",
1223                    pdev->device, pdev->irq, ha->reg);
1224
1225         qla4xxx_config_dma_addressing(ha);
1226
1227         /* Initialize lists and spinlocks. */
1228         INIT_LIST_HEAD(&ha->ddb_list);
1229         INIT_LIST_HEAD(&ha->free_srb_q);
1230
1231         mutex_init(&ha->mbox_sem);
1232
1233         spin_lock_init(&ha->hardware_lock);
1234
1235         /* Allocate dma buffers */
1236         if (qla4xxx_mem_alloc(ha)) {
1237                 dev_warn(&ha->pdev->dev,
1238                            "[ERROR] Failed to allocate memory for adapter\n");
1239
1240                 ret = -ENOMEM;
1241                 goto probe_failed;
1242         }
1243
1244         /*
1245          * Initialize the Host adapter request/response queues and
1246          * firmware
1247          * NOTE: interrupts enabled upon successful completion
1248          */
1249         status = qla4xxx_initialize_adapter(ha, REBUILD_DDB_LIST);
1250         while (status == QLA_ERROR && init_retry_count++ < MAX_INIT_RETRIES) {
1251                 DEBUG2(printk("scsi: %s: retrying adapter initialization "
1252                               "(%d)\n", __func__, init_retry_count));
1253                 qla4xxx_soft_reset(ha);
1254                 status = qla4xxx_initialize_adapter(ha, REBUILD_DDB_LIST);
1255         }
1256         if (status == QLA_ERROR) {
1257                 dev_warn(&ha->pdev->dev, "Failed to initialize adapter\n");
1258
1259                 ret = -ENODEV;
1260                 goto probe_failed;
1261         }
1262
1263         host->cmd_per_lun = 3;
1264         host->max_channel = 0;
1265         host->max_lun = MAX_LUNS - 1;
1266         host->max_id = MAX_TARGETS;
1267         host->max_cmd_len = IOCB_MAX_CDB_LEN;
1268         host->can_queue = MAX_SRBS ;
1269         host->transportt = qla4xxx_scsi_transport;
1270
1271         ret = scsi_init_shared_tag_map(host, MAX_SRBS);
1272         if (ret) {
1273                 dev_warn(&ha->pdev->dev, "scsi_init_shared_tag_map failed\n");
1274                 goto probe_failed;
1275         }
1276
1277         /* Startup the kernel thread for this host adapter. */
1278         DEBUG2(printk("scsi: %s: Starting kernel thread for "
1279                       "qla4xxx_dpc\n", __func__));
1280         sprintf(buf, "qla4xxx_%lu_dpc", ha->host_no);
1281         ha->dpc_thread = create_singlethread_workqueue(buf);
1282         if (!ha->dpc_thread) {
1283                 dev_warn(&ha->pdev->dev, "Unable to start DPC thread!\n");
1284                 ret = -ENODEV;
1285                 goto probe_failed;
1286         }
1287         INIT_WORK(&ha->dpc_work, qla4xxx_do_dpc);
1288
1289         ret = request_irq(pdev->irq, qla4xxx_intr_handler,
1290                           IRQF_DISABLED | IRQF_SHARED, "qla4xxx", ha);
1291         if (ret) {
1292                 dev_warn(&ha->pdev->dev, "Failed to reserve interrupt %d"
1293                         " already in use.\n", pdev->irq);
1294                 goto probe_failed;
1295         }
1296         set_bit(AF_IRQ_ATTACHED, &ha->flags);
1297         host->irq = pdev->irq;
1298         DEBUG(printk("scsi%d: irq %d attached\n", ha->host_no, ha->pdev->irq));
1299
1300         qla4xxx_enable_intrs(ha);
1301
1302         /* Start timer thread. */
1303         qla4xxx_start_timer(ha, qla4xxx_timer, 1);
1304
1305         set_bit(AF_INIT_DONE, &ha->flags);
1306
1307         pci_set_drvdata(pdev, ha);
1308
1309         ret = scsi_add_host(host, &pdev->dev);
1310         if (ret)
1311                 goto probe_failed;
1312
1313         printk(KERN_INFO
1314                " QLogic iSCSI HBA Driver version: %s\n"
1315                "  QLogic ISP%04x @ %s, host#=%ld, fw=%02d.%02d.%02d.%02d\n",
1316                qla4xxx_version_str, ha->pdev->device, pci_name(ha->pdev),
1317                ha->host_no, ha->firmware_version[0], ha->firmware_version[1],
1318                ha->patch_number, ha->build_number);
1319         scsi_scan_host(host);
1320         return 0;
1321
1322 probe_failed:
1323         qla4xxx_free_adapter(ha);
1324         scsi_host_put(ha->host);
1325
1326 probe_disable_device:
1327         pci_disable_device(pdev);
1328
1329         return ret;
1330 }
1331
1332 /**
1333  * qla4xxx_remove_adapter - calback function to remove adapter.
1334  * @pci_dev: PCI device pointer
1335  **/
1336 static void __devexit qla4xxx_remove_adapter(struct pci_dev *pdev)
1337 {
1338         struct scsi_qla_host *ha;
1339
1340         ha = pci_get_drvdata(pdev);
1341
1342         qla4xxx_disable_intrs(ha);
1343
1344         while (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags))
1345                 ssleep(1);
1346
1347         /* remove devs from iscsi_sessions to scsi_devices */
1348         qla4xxx_free_ddb_list(ha);
1349
1350         scsi_remove_host(ha->host);
1351
1352         qla4xxx_free_adapter(ha);
1353
1354         scsi_host_put(ha->host);
1355
1356         pci_set_drvdata(pdev, NULL);
1357 }
1358
1359 /**
1360  * qla4xxx_config_dma_addressing() - Configure OS DMA addressing method.
1361  * @ha: HA context
1362  *
1363  * At exit, the @ha's flags.enable_64bit_addressing set to indicated
1364  * supported addressing method.
1365  */
1366 static void qla4xxx_config_dma_addressing(struct scsi_qla_host *ha)
1367 {
1368         int retval;
1369
1370         /* Update our PCI device dma_mask for full 64 bit mask */
1371         if (pci_set_dma_mask(ha->pdev, DMA_64BIT_MASK) == 0) {
1372                 if (pci_set_consistent_dma_mask(ha->pdev, DMA_64BIT_MASK)) {
1373                         dev_dbg(&ha->pdev->dev,
1374                                   "Failed to set 64 bit PCI consistent mask; "
1375                                    "using 32 bit.\n");
1376                         retval = pci_set_consistent_dma_mask(ha->pdev,
1377                                                              DMA_32BIT_MASK);
1378                 }
1379         } else
1380                 retval = pci_set_dma_mask(ha->pdev, DMA_32BIT_MASK);
1381 }
1382
1383 static int qla4xxx_slave_alloc(struct scsi_device *sdev)
1384 {
1385         struct iscsi_cls_session *sess = starget_to_session(sdev->sdev_target);
1386         struct ddb_entry *ddb = sess->dd_data;
1387
1388         sdev->hostdata = ddb;
1389         sdev->tagged_supported = 1;
1390         scsi_activate_tcq(sdev, sdev->host->can_queue);
1391         return 0;
1392 }
1393
1394 static int qla4xxx_slave_configure(struct scsi_device *sdev)
1395 {
1396         sdev->tagged_supported = 1;
1397         return 0;
1398 }
1399
1400 static void qla4xxx_slave_destroy(struct scsi_device *sdev)
1401 {
1402         scsi_deactivate_tcq(sdev, 1);
1403 }
1404
1405 /**
1406  * qla4xxx_del_from_active_array - returns an active srb
1407  * @ha: Pointer to host adapter structure.
1408  * @index: index into to the active_array
1409  *
1410  * This routine removes and returns the srb at the specified index
1411  **/
1412 struct srb * qla4xxx_del_from_active_array(struct scsi_qla_host *ha, uint32_t index)
1413 {
1414         struct srb *srb = NULL;
1415         struct scsi_cmnd *cmd;
1416
1417         if (!(cmd = scsi_host_find_tag(ha->host, index)))
1418                 return srb;
1419
1420         if (!(srb = (struct srb *)cmd->host_scribble))
1421                 return srb;
1422
1423         /* update counters */
1424         if (srb->flags & SRB_DMA_VALID) {
1425                 ha->req_q_count += srb->iocb_cnt;
1426                 ha->iocb_cnt -= srb->iocb_cnt;
1427                 if (srb->cmd)
1428                         srb->cmd->host_scribble = NULL;
1429         }
1430         return srb;
1431 }
1432
1433 /**
1434  * qla4xxx_eh_wait_on_command - waits for command to be returned by firmware
1435  * @ha: actual ha whose done queue will contain the comd returned by firmware.
1436  * @cmd: Scsi Command to wait on.
1437  *
1438  * This routine waits for the command to be returned by the Firmware
1439  * for some max time.
1440  **/
1441 static int qla4xxx_eh_wait_on_command(struct scsi_qla_host *ha,
1442                                       struct scsi_cmnd *cmd)
1443 {
1444         int done = 0;
1445         struct srb *rp;
1446         uint32_t max_wait_time = EH_WAIT_CMD_TOV;
1447
1448         do {
1449                 /* Checking to see if its returned to OS */
1450                 rp = (struct srb *) cmd->SCp.ptr;
1451                 if (rp == NULL) {
1452                         done++;
1453                         break;
1454                 }
1455
1456                 msleep(2000);
1457         } while (max_wait_time--);
1458
1459         return done;
1460 }
1461
1462 /**
1463  * qla4xxx_wait_for_hba_online - waits for HBA to come online
1464  * @ha: Pointer to host adapter structure
1465  **/
1466 static int qla4xxx_wait_for_hba_online(struct scsi_qla_host *ha)
1467 {
1468         unsigned long wait_online;
1469
1470         wait_online = jiffies + (30 * HZ);
1471         while (time_before(jiffies, wait_online)) {
1472
1473                 if (adapter_up(ha))
1474                         return QLA_SUCCESS;
1475                 else if (ha->retry_reset_ha_cnt == 0)
1476                         return QLA_ERROR;
1477
1478                 msleep(2000);
1479         }
1480
1481         return QLA_ERROR;
1482 }
1483
1484 /**
1485  * qla4xxx_eh_wait_for_commands - wait for active cmds to finish.
1486  * @ha: pointer to to HBA
1487  * @t: target id
1488  * @l: lun id
1489  *
1490  * This function waits for all outstanding commands to a lun to complete. It
1491  * returns 0 if all pending commands are returned and 1 otherwise.
1492  **/
1493 static int qla4xxx_eh_wait_for_commands(struct scsi_qla_host *ha,
1494                                         struct scsi_target *stgt,
1495                                         struct scsi_device *sdev)
1496 {
1497         int cnt;
1498         int status = 0;
1499         struct scsi_cmnd *cmd;
1500
1501         /*
1502          * Waiting for all commands for the designated target or dev
1503          * in the active array
1504          */
1505         for (cnt = 0; cnt < ha->host->can_queue; cnt++) {
1506                 cmd = scsi_host_find_tag(ha->host, cnt);
1507                 if (cmd && stgt == scsi_target(cmd->device) &&
1508                     (!sdev || sdev == cmd->device)) {
1509                         if (!qla4xxx_eh_wait_on_command(ha, cmd)) {
1510                                 status++;
1511                                 break;
1512                         }
1513                 }
1514         }
1515         return status;
1516 }
1517
1518 /**
1519  * qla4xxx_eh_device_reset - callback for target reset.
1520  * @cmd: Pointer to Linux's SCSI command structure
1521  *
1522  * This routine is called by the Linux OS to reset all luns on the
1523  * specified target.
1524  **/
1525 static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd)
1526 {
1527         struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
1528         struct ddb_entry *ddb_entry = cmd->device->hostdata;
1529         struct srb *sp;
1530         int ret = FAILED, stat;
1531
1532         sp = (struct srb *) cmd->SCp.ptr;
1533         if (!sp || !ddb_entry)
1534                 return ret;
1535
1536         dev_info(&ha->pdev->dev,
1537                    "scsi%ld:%d:%d:%d: DEVICE RESET ISSUED.\n", ha->host_no,
1538                    cmd->device->channel, cmd->device->id, cmd->device->lun);
1539
1540         DEBUG2(printk(KERN_INFO
1541                       "scsi%ld: DEVICE_RESET cmd=%p jiffies = 0x%lx, to=%x,"
1542                       "dpc_flags=%lx, status=%x allowed=%d\n", ha->host_no,
1543                       cmd, jiffies, cmd->timeout_per_command / HZ,
1544                       ha->dpc_flags, cmd->result, cmd->allowed));
1545
1546         /* FIXME: wait for hba to go online */
1547         stat = qla4xxx_reset_lun(ha, ddb_entry, cmd->device->lun);
1548         if (stat != QLA_SUCCESS) {
1549                 dev_info(&ha->pdev->dev, "DEVICE RESET FAILED. %d\n", stat);
1550                 goto eh_dev_reset_done;
1551         }
1552
1553         if (qla4xxx_eh_wait_for_commands(ha, scsi_target(cmd->device),
1554                                          cmd->device)) {
1555                 dev_info(&ha->pdev->dev,
1556                            "DEVICE RESET FAILED - waiting for "
1557                            "commands.\n");
1558                 goto eh_dev_reset_done;
1559         }
1560
1561         /* Send marker. */
1562         if (qla4xxx_send_marker_iocb(ha, ddb_entry, cmd->device->lun,
1563                 MM_LUN_RESET) != QLA_SUCCESS)
1564                 goto eh_dev_reset_done;
1565
1566         dev_info(&ha->pdev->dev,
1567                    "scsi(%ld:%d:%d:%d): DEVICE RESET SUCCEEDED.\n",
1568                    ha->host_no, cmd->device->channel, cmd->device->id,
1569                    cmd->device->lun);
1570
1571         ret = SUCCESS;
1572
1573 eh_dev_reset_done:
1574
1575         return ret;
1576 }
1577
1578 /**
1579  * qla4xxx_eh_target_reset - callback for target reset.
1580  * @cmd: Pointer to Linux's SCSI command structure
1581  *
1582  * This routine is called by the Linux OS to reset the target.
1583  **/
1584 static int qla4xxx_eh_target_reset(struct scsi_cmnd *cmd)
1585 {
1586         struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
1587         struct ddb_entry *ddb_entry = cmd->device->hostdata;
1588         int stat;
1589
1590         if (!ddb_entry)
1591                 return FAILED;
1592
1593         starget_printk(KERN_INFO, scsi_target(cmd->device),
1594                        "WARM TARGET RESET ISSUED.\n");
1595
1596         DEBUG2(printk(KERN_INFO
1597                       "scsi%ld: TARGET_DEVICE_RESET cmd=%p jiffies = 0x%lx, "
1598                       "to=%x,dpc_flags=%lx, status=%x allowed=%d\n",
1599                       ha->host_no, cmd, jiffies, cmd->timeout_per_command / HZ,
1600                       ha->dpc_flags, cmd->result, cmd->allowed));
1601
1602         stat = qla4xxx_reset_target(ha, ddb_entry);
1603         if (stat != QLA_SUCCESS) {
1604                 starget_printk(KERN_INFO, scsi_target(cmd->device),
1605                                "WARM TARGET RESET FAILED.\n");
1606                 return FAILED;
1607         }
1608
1609         if (qla4xxx_eh_wait_for_commands(ha, scsi_target(cmd->device),
1610                                          NULL)) {
1611                 starget_printk(KERN_INFO, scsi_target(cmd->device),
1612                                "WARM TARGET DEVICE RESET FAILED - "
1613                                "waiting for commands.\n");
1614                 return FAILED;
1615         }
1616
1617         /* Send marker. */
1618         if (qla4xxx_send_marker_iocb(ha, ddb_entry, cmd->device->lun,
1619                 MM_TGT_WARM_RESET) != QLA_SUCCESS) {
1620                 starget_printk(KERN_INFO, scsi_target(cmd->device),
1621                                "WARM TARGET DEVICE RESET FAILED - "
1622                                "marker iocb failed.\n");
1623                 return FAILED;
1624         }
1625
1626         starget_printk(KERN_INFO, scsi_target(cmd->device),
1627                        "WARM TARGET RESET SUCCEEDED.\n");
1628         return SUCCESS;
1629 }
1630
1631 /**
1632  * qla4xxx_eh_host_reset - kernel callback
1633  * @cmd: Pointer to Linux's SCSI command structure
1634  *
1635  * This routine is invoked by the Linux kernel to perform fatal error
1636  * recovery on the specified adapter.
1637  **/
1638 static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd)
1639 {
1640         int return_status = FAILED;
1641         struct scsi_qla_host *ha;
1642
1643         ha = (struct scsi_qla_host *) cmd->device->host->hostdata;
1644
1645         dev_info(&ha->pdev->dev,
1646                    "scsi(%ld:%d:%d:%d): ADAPTER RESET ISSUED.\n", ha->host_no,
1647                    cmd->device->channel, cmd->device->id, cmd->device->lun);
1648
1649         if (qla4xxx_wait_for_hba_online(ha) != QLA_SUCCESS) {
1650                 DEBUG2(printk("scsi%ld:%d: %s: Unable to reset host.  Adapter "
1651                               "DEAD.\n", ha->host_no, cmd->device->channel,
1652                               __func__));
1653
1654                 return FAILED;
1655         }
1656
1657         /* make sure the dpc thread is stopped while we reset the hba */
1658         clear_bit(AF_ONLINE, &ha->flags);
1659         flush_workqueue(ha->dpc_thread);
1660
1661         if (qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST) == QLA_SUCCESS)
1662                 return_status = SUCCESS;
1663
1664         dev_info(&ha->pdev->dev, "HOST RESET %s.\n",
1665                    return_status == FAILED ? "FAILED" : "SUCCEDED");
1666
1667         return return_status;
1668 }
1669
1670
1671 static struct pci_device_id qla4xxx_pci_tbl[] = {
1672         {
1673                 .vendor         = PCI_VENDOR_ID_QLOGIC,
1674                 .device         = PCI_DEVICE_ID_QLOGIC_ISP4010,
1675                 .subvendor      = PCI_ANY_ID,
1676                 .subdevice      = PCI_ANY_ID,
1677         },
1678         {
1679                 .vendor         = PCI_VENDOR_ID_QLOGIC,
1680                 .device         = PCI_DEVICE_ID_QLOGIC_ISP4022,
1681                 .subvendor      = PCI_ANY_ID,
1682                 .subdevice      = PCI_ANY_ID,
1683         },
1684         {
1685                 .vendor         = PCI_VENDOR_ID_QLOGIC,
1686                 .device         = PCI_DEVICE_ID_QLOGIC_ISP4032,
1687                 .subvendor      = PCI_ANY_ID,
1688                 .subdevice      = PCI_ANY_ID,
1689         },
1690         {0, 0},
1691 };
1692 MODULE_DEVICE_TABLE(pci, qla4xxx_pci_tbl);
1693
1694 static struct pci_driver qla4xxx_pci_driver = {
1695         .name           = DRIVER_NAME,
1696         .id_table       = qla4xxx_pci_tbl,
1697         .probe          = qla4xxx_probe_adapter,
1698         .remove         = qla4xxx_remove_adapter,
1699 };
1700
1701 static int __init qla4xxx_module_init(void)
1702 {
1703         int ret;
1704
1705         /* Allocate cache for SRBs. */
1706         srb_cachep = kmem_cache_create("qla4xxx_srbs", sizeof(struct srb), 0,
1707                                        SLAB_HWCACHE_ALIGN, NULL);
1708         if (srb_cachep == NULL) {
1709                 printk(KERN_ERR
1710                        "%s: Unable to allocate SRB cache..."
1711                        "Failing load!\n", DRIVER_NAME);
1712                 ret = -ENOMEM;
1713                 goto no_srp_cache;
1714         }
1715
1716         /* Derive version string. */
1717         strcpy(qla4xxx_version_str, QLA4XXX_DRIVER_VERSION);
1718         if (ql4xextended_error_logging)
1719                 strcat(qla4xxx_version_str, "-debug");
1720
1721         qla4xxx_scsi_transport =
1722                 iscsi_register_transport(&qla4xxx_iscsi_transport);
1723         if (!qla4xxx_scsi_transport){
1724                 ret = -ENODEV;
1725                 goto release_srb_cache;
1726         }
1727
1728         ret = pci_register_driver(&qla4xxx_pci_driver);
1729         if (ret)
1730                 goto unregister_transport;
1731
1732         printk(KERN_INFO "QLogic iSCSI HBA Driver\n");
1733         return 0;
1734
1735 unregister_transport:
1736         iscsi_unregister_transport(&qla4xxx_iscsi_transport);
1737 release_srb_cache:
1738         kmem_cache_destroy(srb_cachep);
1739 no_srp_cache:
1740         return ret;
1741 }
1742
1743 static void __exit qla4xxx_module_exit(void)
1744 {
1745         ql4_mod_unload = 1;
1746         pci_unregister_driver(&qla4xxx_pci_driver);
1747         iscsi_unregister_transport(&qla4xxx_iscsi_transport);
1748         kmem_cache_destroy(srb_cachep);
1749 }
1750
1751 module_init(qla4xxx_module_init);
1752 module_exit(qla4xxx_module_exit);
1753
1754 MODULE_AUTHOR("QLogic Corporation");
1755 MODULE_DESCRIPTION("QLogic iSCSI HBA Driver");
1756 MODULE_LICENSE("GPL");
1757 MODULE_VERSION(QLA4XXX_DRIVER_VERSION);