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ql4_os.c

/*
 * QLogic iSCSI HBA Driver
 * Copyright (c)  2003-2006 QLogic Corporation
 *
 * See LICENSE.qla4xxx for copyright and licensing details.
 */
#include <linux/moduleparam.h>

#include <scsi/scsi_tcq.h>
#include <scsi/scsicam.h>

#include "ql4_def.h"
#include "ql4_version.h"
#include "ql4_glbl.h"
#include "ql4_dbg.h"
#include "ql4_inline.h"

/*
 * Driver version
 */
static char qla4xxx_version_str[40];

/*
 * SRB allocation cache
 */
static struct kmem_cache *srb_cachep;

/*
 * Module parameter information and variables
 */
int ql4xdiscoverywait = 60;
module_param(ql4xdiscoverywait, int, S_IRUGO | S_IRUSR);
MODULE_PARM_DESC(ql4xdiscoverywait, "Discovery wait time");
int ql4xdontresethba = 0;
module_param(ql4xdontresethba, int, S_IRUGO | S_IRUSR);
MODULE_PARM_DESC(ql4xdontresethba,
             "Dont reset the HBA when the driver gets 0x8002 AEN "
             " default it will reset hba :0"
             " set to 1 to avoid resetting HBA");

int ql4xextended_error_logging = 0; /* 0 = off, 1 = log errors */
module_param(ql4xextended_error_logging, int, S_IRUGO | S_IRUSR);
MODULE_PARM_DESC(ql4xextended_error_logging,
             "Option to enable extended error logging, "
             "Default is 0 - no logging, 1 - debug logging");

int ql4_mod_unload = 0;

/*
 * SCSI host template entry points
 */
static void qla4xxx_config_dma_addressing(struct scsi_qla_host *ha);

/*
 * iSCSI template entry points
 */
static int qla4xxx_tgt_dscvr(struct Scsi_Host *shost,
                       enum iscsi_tgt_dscvr type, uint32_t enable,
                       struct sockaddr *dst_addr);
static int qla4xxx_conn_get_param(struct iscsi_cls_conn *conn,
                          enum iscsi_param param, char *buf);
static int qla4xxx_sess_get_param(struct iscsi_cls_session *sess,
                          enum iscsi_param param, char *buf);
static int qla4xxx_host_get_param(struct Scsi_Host *shost,
                          enum iscsi_host_param param, char *buf);
static void qla4xxx_conn_stop(struct iscsi_cls_conn *conn, int flag);
static int qla4xxx_conn_start(struct iscsi_cls_conn *conn);
static void qla4xxx_recovery_timedout(struct iscsi_cls_session *session);

/*
 * SCSI host template entry points
 */
static int qla4xxx_queuecommand(struct scsi_cmnd *cmd,
                        void (*done) (struct scsi_cmnd *));
static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd);
static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd);
static int qla4xxx_slave_alloc(struct scsi_device *device);
static int qla4xxx_slave_configure(struct scsi_device *device);
static void qla4xxx_slave_destroy(struct scsi_device *sdev);

static struct scsi_host_template qla4xxx_driver_template = {
      .module                 = THIS_MODULE,
      .name             = DRIVER_NAME,
      .proc_name        = DRIVER_NAME,
      .queuecommand           = qla4xxx_queuecommand,

      .eh_device_reset_handler = qla4xxx_eh_device_reset,
      .eh_host_reset_handler  = qla4xxx_eh_host_reset,

      .slave_configure  = qla4xxx_slave_configure,
      .slave_alloc            = qla4xxx_slave_alloc,
      .slave_destroy          = qla4xxx_slave_destroy,

      .this_id          = -1,
      .cmd_per_lun            = 3,
      .use_clustering         = ENABLE_CLUSTERING,
      .use_sg_chaining  = ENABLE_SG_CHAINING,
      .sg_tablesize           = SG_ALL,

      .max_sectors            = 0xFFFF,
};

static struct iscsi_transport qla4xxx_iscsi_transport = {
      .owner                  = THIS_MODULE,
      .name             = DRIVER_NAME,
      .caps             = CAP_FW_DB | CAP_SENDTARGETS_OFFLOAD |
                          CAP_DATA_PATH_OFFLOAD,
      .param_mask       = ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS |
                          ISCSI_TARGET_NAME | ISCSI_TPGT,
      .host_param_mask  = ISCSI_HOST_HWADDRESS |
                          ISCSI_HOST_IPADDRESS |
                          ISCSI_HOST_INITIATOR_NAME,
      .sessiondata_size = sizeof(struct ddb_entry),
      .host_template          = &qla4xxx_driver_template,

      .tgt_dscvr        = qla4xxx_tgt_dscvr,
      .get_conn_param         = qla4xxx_conn_get_param,
      .get_session_param      = qla4xxx_sess_get_param,
      .get_host_param         = qla4xxx_host_get_param,
      .start_conn       = qla4xxx_conn_start,
      .stop_conn        = qla4xxx_conn_stop,
      .session_recovery_timedout = qla4xxx_recovery_timedout,
};

static struct scsi_transport_template *qla4xxx_scsi_transport;

static void qla4xxx_recovery_timedout(struct iscsi_cls_session *session)
{
      struct ddb_entry *ddb_entry = session->dd_data;
      struct scsi_qla_host *ha = ddb_entry->ha;

      DEBUG2(printk("scsi%ld: %s: index [%d] port down retry count of (%d) "
                  "secs exhausted, marking device DEAD.\n", ha->host_no,
                  __func__, ddb_entry->fw_ddb_index,
                  ha->port_down_retry_count));

      atomic_set(&ddb_entry->state, DDB_STATE_DEAD);

      DEBUG2(printk("scsi%ld: %s: scheduling dpc routine - dpc flags = "
                  "0x%lx\n", ha->host_no, __func__, ha->dpc_flags));
      queue_work(ha->dpc_thread, &ha->dpc_work);
}

static int qla4xxx_conn_start(struct iscsi_cls_conn *conn)
{
      struct iscsi_cls_session *session;
      struct ddb_entry *ddb_entry;

      session = iscsi_dev_to_session(conn->dev.parent);
      ddb_entry = session->dd_data;

      DEBUG2(printk("scsi%ld: %s: index [%d] starting conn\n",
                  ddb_entry->ha->host_no, __func__,
                  ddb_entry->fw_ddb_index));
      iscsi_unblock_session(session);
      return 0;
}

static void qla4xxx_conn_stop(struct iscsi_cls_conn *conn, int flag)
{
      struct iscsi_cls_session *session;
      struct ddb_entry *ddb_entry;

      session = iscsi_dev_to_session(conn->dev.parent);
      ddb_entry = session->dd_data;

      DEBUG2(printk("scsi%ld: %s: index [%d] stopping conn\n",
                  ddb_entry->ha->host_no, __func__,
                  ddb_entry->fw_ddb_index));
      if (flag == STOP_CONN_RECOVER)
            iscsi_block_session(session);
      else
            printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
}

static ssize_t format_addr(char *buf, const unsigned char *addr, int len)
{
      int i;
      char *cp = buf;

      for (i = 0; i < len; i++)
            cp += sprintf(cp, "%02x%c", addr[i],
                        i == (len - 1) ? '\n' : ':');
      return cp - buf;
}


static int qla4xxx_host_get_param(struct Scsi_Host *shost,
                          enum iscsi_host_param param, char *buf)
{
      struct scsi_qla_host *ha = to_qla_host(shost);
      int len;

      switch (param) {
      case ISCSI_HOST_PARAM_HWADDRESS:
            len = format_addr(buf, ha->my_mac, MAC_ADDR_LEN);
            break;
      case ISCSI_HOST_PARAM_IPADDRESS:
            len = sprintf(buf, "%d.%d.%d.%d\n", ha->ip_address[0],
                        ha->ip_address[1], ha->ip_address[2],
                        ha->ip_address[3]);
            break;
      case ISCSI_HOST_PARAM_INITIATOR_NAME:
            len = sprintf(buf, "%s\n", ha->name_string);
            break;
      default:
            return -ENOSYS;
      }

      return len;
}

static int qla4xxx_sess_get_param(struct iscsi_cls_session *sess,
                          enum iscsi_param param, char *buf)
{
      struct ddb_entry *ddb_entry = sess->dd_data;
      int len;

      switch (param) {
      case ISCSI_PARAM_TARGET_NAME:
            len = snprintf(buf, PAGE_SIZE - 1, "%s\n",
                         ddb_entry->iscsi_name);
            break;
      case ISCSI_PARAM_TPGT:
            len = sprintf(buf, "%u\n", ddb_entry->tpgt);
            break;
      default:
            return -ENOSYS;
      }

      return len;
}

static int qla4xxx_conn_get_param(struct iscsi_cls_conn *conn,
                          enum iscsi_param param, char *buf)
{
      struct iscsi_cls_session *session;
      struct ddb_entry *ddb_entry;
      int len;

      session = iscsi_dev_to_session(conn->dev.parent);
      ddb_entry = session->dd_data;

      switch (param) {
      case ISCSI_PARAM_CONN_PORT:
            len = sprintf(buf, "%hu\n", ddb_entry->port);
            break;
      case ISCSI_PARAM_CONN_ADDRESS:
            /* TODO: what are the ipv6 bits */
            len = sprintf(buf, "%u.%u.%u.%u\n",
                        NIPQUAD(ddb_entry->ip_addr));
            break;
      default:
            return -ENOSYS;
      }

      return len;
}

static int qla4xxx_tgt_dscvr(struct Scsi_Host *shost,
                       enum iscsi_tgt_dscvr type, uint32_t enable,
                       struct sockaddr *dst_addr)
{
      struct scsi_qla_host *ha;
      struct sockaddr_in *addr;
      struct sockaddr_in6 *addr6;
      int ret = 0;

      ha = (struct scsi_qla_host *) shost->hostdata;

      switch (type) {
      case ISCSI_TGT_DSCVR_SEND_TARGETS:
            if (dst_addr->sa_family == AF_INET) {
                  addr = (struct sockaddr_in *)dst_addr;
                  if (qla4xxx_send_tgts(ha, (char *)&addr->sin_addr,
                                    addr->sin_port) != QLA_SUCCESS)
                        ret = -EIO;
            } else if (dst_addr->sa_family == AF_INET6) {
                  /*
                   * TODO: fix qla4xxx_send_tgts
                   */
                  addr6 = (struct sockaddr_in6 *)dst_addr;
                  if (qla4xxx_send_tgts(ha, (char *)&addr6->sin6_addr,
                                    addr6->sin6_port) != QLA_SUCCESS)
                        ret = -EIO;
            } else
                  ret = -ENOSYS;
            break;
      default:
            ret = -ENOSYS;
      }
      return ret;
}

void qla4xxx_destroy_sess(struct ddb_entry *ddb_entry)
{
      if (!ddb_entry->sess)
            return;

      if (ddb_entry->conn) {
            iscsi_if_destroy_session_done(ddb_entry->conn);
            iscsi_destroy_conn(ddb_entry->conn);
            iscsi_remove_session(ddb_entry->sess);
      }
      iscsi_free_session(ddb_entry->sess);
}

int qla4xxx_add_sess(struct ddb_entry *ddb_entry)
{
      int err;

      err = iscsi_add_session(ddb_entry->sess, ddb_entry->fw_ddb_index);
      if (err) {
            DEBUG2(printk(KERN_ERR "Could not add session.\n"));
            return err;
      }

      ddb_entry->conn = iscsi_create_conn(ddb_entry->sess, 0);
      if (!ddb_entry->conn) {
            iscsi_remove_session(ddb_entry->sess);
            DEBUG2(printk(KERN_ERR "Could not add connection.\n"));
            return -ENOMEM;
      }

      ddb_entry->sess->recovery_tmo = ddb_entry->ha->port_down_retry_count;
      iscsi_if_create_session_done(ddb_entry->conn);
      return 0;
}

struct ddb_entry *qla4xxx_alloc_sess(struct scsi_qla_host *ha)
{
      struct ddb_entry *ddb_entry;
      struct iscsi_cls_session *sess;

      sess = iscsi_alloc_session(ha->host, &qla4xxx_iscsi_transport);
      if (!sess)
            return NULL;

      ddb_entry = sess->dd_data;
      memset(ddb_entry, 0, sizeof(*ddb_entry));
      ddb_entry->ha = ha;
      ddb_entry->sess = sess;
      return ddb_entry;
}

/*
 * Timer routines
 */

static void qla4xxx_start_timer(struct scsi_qla_host *ha, void *func,
                        unsigned long interval)
{
      DEBUG(printk("scsi: %s: Starting timer thread for adapter %d\n",
                 __func__, ha->host->host_no));
      init_timer(&ha->timer);
      ha->timer.expires = jiffies + interval * HZ;
      ha->timer.data = (unsigned long)ha;
      ha->timer.function = (void (*)(unsigned long))func;
      add_timer(&ha->timer);
      ha->timer_active = 1;
}

static void qla4xxx_stop_timer(struct scsi_qla_host *ha)
{
      del_timer_sync(&ha->timer);
      ha->timer_active = 0;
}

/***
 * qla4xxx_mark_device_missing - mark a device as missing.
 * @ha: Pointer to host adapter structure.
 * @ddb_entry: Pointer to device database entry
 *
 * This routine marks a device missing and resets the relogin retry count.
 **/
void qla4xxx_mark_device_missing(struct scsi_qla_host *ha,
                         struct ddb_entry *ddb_entry)
{
      atomic_set(&ddb_entry->state, DDB_STATE_MISSING);
      DEBUG3(printk("scsi%d:%d:%d: index [%d] marked MISSING\n",
                  ha->host_no, ddb_entry->bus, ddb_entry->target,
                  ddb_entry->fw_ddb_index));
      iscsi_conn_error(ddb_entry->conn, ISCSI_ERR_CONN_FAILED);
}

static struct srb* qla4xxx_get_new_srb(struct scsi_qla_host *ha,
                               struct ddb_entry *ddb_entry,
                               struct scsi_cmnd *cmd,
                               void (*done)(struct scsi_cmnd *))
{
      struct srb *srb;

      srb = mempool_alloc(ha->srb_mempool, GFP_ATOMIC);
      if (!srb)
            return srb;

      atomic_set(&srb->ref_count, 1);
      srb->ha = ha;
      srb->ddb = ddb_entry;
      srb->cmd = cmd;
      srb->flags = 0;
      cmd->SCp.ptr = (void *)srb;
      cmd->scsi_done = done;

      return srb;
}

static void qla4xxx_srb_free_dma(struct scsi_qla_host *ha, struct srb *srb)
{
      struct scsi_cmnd *cmd = srb->cmd;

      if (srb->flags & SRB_DMA_VALID) {
            scsi_dma_unmap(cmd);
            srb->flags &= ~SRB_DMA_VALID;
      }
      cmd->SCp.ptr = NULL;
}

void qla4xxx_srb_compl(struct scsi_qla_host *ha, struct srb *srb)
{
      struct scsi_cmnd *cmd = srb->cmd;

      qla4xxx_srb_free_dma(ha, srb);

      mempool_free(srb, ha->srb_mempool);

      cmd->scsi_done(cmd);
}

/**
 * qla4xxx_queuecommand - scsi layer issues scsi command to driver.
 * @cmd: Pointer to Linux's SCSI command structure
 * @done_fn: Function that the driver calls to notify the SCSI mid-layer
 *    that the command has been processed.
 *
 * Remarks:
 * This routine is invoked by Linux to send a SCSI command to the driver.
 * The mid-level driver tries to ensure that queuecommand never gets
 * invoked concurrently with itself or the interrupt handler (although
 * the interrupt handler may call this routine as part of request-
 * completion handling).   Unfortunely, it sometimes calls the scheduler
 * in interrupt context which is a big NO! NO!.
 **/
static int qla4xxx_queuecommand(struct scsi_cmnd *cmd,
                        void (*done)(struct scsi_cmnd *))
{
      struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
      struct ddb_entry *ddb_entry = cmd->device->hostdata;
      struct srb *srb;
      int rval;

      if (atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
            if (atomic_read(&ddb_entry->state) == DDB_STATE_DEAD) {
                  cmd->result = DID_NO_CONNECT << 16;
                  goto qc_fail_command;
            }
            goto qc_host_busy;
      }

      if (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags))
            goto qc_host_busy;

      spin_unlock_irq(ha->host->host_lock);

      srb = qla4xxx_get_new_srb(ha, ddb_entry, cmd, done);
      if (!srb)
            goto qc_host_busy_lock;

      rval = qla4xxx_send_command_to_isp(ha, srb);
      if (rval != QLA_SUCCESS)
            goto qc_host_busy_free_sp;

      spin_lock_irq(ha->host->host_lock);
      return 0;

qc_host_busy_free_sp:
      qla4xxx_srb_free_dma(ha, srb);
      mempool_free(srb, ha->srb_mempool);

qc_host_busy_lock:
      spin_lock_irq(ha->host->host_lock);

qc_host_busy:
      return SCSI_MLQUEUE_HOST_BUSY;

qc_fail_command:
      done(cmd);

      return 0;
}

/**
 * qla4xxx_mem_free - frees memory allocated to adapter
 * @ha: Pointer to host adapter structure.
 *
 * Frees memory previously allocated by qla4xxx_mem_alloc
 **/
static void qla4xxx_mem_free(struct scsi_qla_host *ha)
{
      if (ha->queues)
            dma_free_coherent(&ha->pdev->dev, ha->queues_len, ha->queues,
                          ha->queues_dma);

      ha->queues_len = 0;
      ha->queues = NULL;
      ha->queues_dma = 0;
      ha->request_ring = NULL;
      ha->request_dma = 0;
      ha->response_ring = NULL;
      ha->response_dma = 0;
      ha->shadow_regs = NULL;
      ha->shadow_regs_dma = 0;

      /* Free srb pool. */
      if (ha->srb_mempool)
            mempool_destroy(ha->srb_mempool);

      ha->srb_mempool = NULL;

      /* release io space registers  */
      if (ha->reg)
            iounmap(ha->reg);
      pci_release_regions(ha->pdev);
}

/**
 * qla4xxx_mem_alloc - allocates memory for use by adapter.
 * @ha: Pointer to host adapter structure
 *
 * Allocates DMA memory for request and response queues. Also allocates memory
 * for srbs.
 **/
static int qla4xxx_mem_alloc(struct scsi_qla_host *ha)
{
      unsigned long align;

      /* Allocate contiguous block of DMA memory for queues. */
      ha->queues_len = ((REQUEST_QUEUE_DEPTH * QUEUE_SIZE) +
                    (RESPONSE_QUEUE_DEPTH * QUEUE_SIZE) +
                    sizeof(struct shadow_regs) +
                    MEM_ALIGN_VALUE +
                    (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
      ha->queues = dma_alloc_coherent(&ha->pdev->dev, ha->queues_len,
                              &ha->queues_dma, GFP_KERNEL);
      if (ha->queues == NULL) {
            dev_warn(&ha->pdev->dev,
                  "Memory Allocation failed - queues.\n");

            goto mem_alloc_error_exit;
      }
      memset(ha->queues, 0, ha->queues_len);

      /*
       * As per RISC alignment requirements -- the bus-address must be a
       * multiple of the request-ring size (in bytes).
       */
      align = 0;
      if ((unsigned long)ha->queues_dma & (MEM_ALIGN_VALUE - 1))
            align = MEM_ALIGN_VALUE - ((unsigned long)ha->queues_dma &
                                 (MEM_ALIGN_VALUE - 1));

      /* Update request and response queue pointers. */
      ha->request_dma = ha->queues_dma + align;
      ha->request_ring = (struct queue_entry *) (ha->queues + align);
      ha->response_dma = ha->queues_dma + align +
            (REQUEST_QUEUE_DEPTH * QUEUE_SIZE);
      ha->response_ring = (struct queue_entry *) (ha->queues + align +
                                        (REQUEST_QUEUE_DEPTH *
                                         QUEUE_SIZE));
      ha->shadow_regs_dma = ha->queues_dma + align +
            (REQUEST_QUEUE_DEPTH * QUEUE_SIZE) +
            (RESPONSE_QUEUE_DEPTH * QUEUE_SIZE);
      ha->shadow_regs = (struct shadow_regs *) (ha->queues + align +
                                      (REQUEST_QUEUE_DEPTH *
                                       QUEUE_SIZE) +
                                      (RESPONSE_QUEUE_DEPTH *
                                       QUEUE_SIZE));

      /* Allocate memory for srb pool. */
      ha->srb_mempool = mempool_create(SRB_MIN_REQ, mempool_alloc_slab,
                               mempool_free_slab, srb_cachep);
      if (ha->srb_mempool == NULL) {
            dev_warn(&ha->pdev->dev,
                  "Memory Allocation failed - SRB Pool.\n");

            goto mem_alloc_error_exit;
      }

      return QLA_SUCCESS;

mem_alloc_error_exit:
      qla4xxx_mem_free(ha);
      return QLA_ERROR;
}

/**
 * qla4xxx_timer - checks every second for work to do.
 * @ha: Pointer to host adapter structure.
 **/
static void qla4xxx_timer(struct scsi_qla_host *ha)
{
      struct ddb_entry *ddb_entry, *dtemp;
      int start_dpc = 0;

      /* Search for relogin's to time-out and port down retry. */
      list_for_each_entry_safe(ddb_entry, dtemp, &ha->ddb_list, list) {
            /* Count down time between sending relogins */
            if (adapter_up(ha) &&
                !test_bit(DF_RELOGIN, &ddb_entry->flags) &&
                atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
                  if (atomic_read(&ddb_entry->retry_relogin_timer) !=
                      INVALID_ENTRY) {
                        if (atomic_read(&ddb_entry->retry_relogin_timer)
                                    == 0) {
                              atomic_set(&ddb_entry->
                                    retry_relogin_timer,
                                    INVALID_ENTRY);
                              set_bit(DPC_RELOGIN_DEVICE,
                                    &ha->dpc_flags);
                              set_bit(DF_RELOGIN, &ddb_entry->flags);
                              DEBUG2(printk("scsi%ld: %s: index [%d]"
                                          " login device\n",
                                          ha->host_no, __func__,
                                          ddb_entry->fw_ddb_index));
                        } else
                              atomic_dec(&ddb_entry->
                                          retry_relogin_timer);
                  }
            }

            /* Wait for relogin to timeout */
            if (atomic_read(&ddb_entry->relogin_timer) &&
                (atomic_dec_and_test(&ddb_entry->relogin_timer) != 0)) {
                  /*
                   * If the relogin times out and the device is
                   * still NOT ONLINE then try and relogin again.
                   */
                  if (atomic_read(&ddb_entry->state) !=
                      DDB_STATE_ONLINE &&
                      ddb_entry->fw_ddb_device_state ==
                      DDB_DS_SESSION_FAILED) {
                        /* Reset retry relogin timer */
                        atomic_inc(&ddb_entry->relogin_retry_count);
                        DEBUG2(printk("scsi%ld: index[%d] relogin"
                                    " timed out-retrying"
                                    " relogin (%d)\n",
                                    ha->host_no,
                                    ddb_entry->fw_ddb_index,
                                    atomic_read(&ddb_entry->
                                            relogin_retry_count))
                              );
                        start_dpc++;
                        DEBUG(printk("scsi%ld:%d:%d: index [%d] "
                                   "initate relogin after"
                                   " %d seconds\n",
                                   ha->host_no, ddb_entry->bus,
                                   ddb_entry->target,
                                   ddb_entry->fw_ddb_index,
                                   ddb_entry->default_time2wait + 4)
                              );

                        atomic_set(&ddb_entry->retry_relogin_timer,
                                 ddb_entry->default_time2wait + 4);
                  }
            }
      }

      /* Check for heartbeat interval. */
      if (ha->firmware_options & FWOPT_HEARTBEAT_ENABLE &&
          ha->heartbeat_interval != 0) {
            ha->seconds_since_last_heartbeat++;
            if (ha->seconds_since_last_heartbeat >
                ha->heartbeat_interval + 2)
                  set_bit(DPC_RESET_HA, &ha->dpc_flags);
      }


      /* Wakeup the dpc routine for this adapter, if needed. */
      if ((start_dpc ||
           test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
           test_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags) ||
           test_bit(DPC_RELOGIN_DEVICE, &ha->dpc_flags) ||
           test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags) ||
           test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags) ||
           test_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags) ||
           test_bit(DPC_AEN, &ha->dpc_flags)) &&
           ha->dpc_thread) {
            DEBUG2(printk("scsi%ld: %s: scheduling dpc routine"
                        " - dpc flags = 0x%lx\n",
                        ha->host_no, __func__, ha->dpc_flags));
            queue_work(ha->dpc_thread, &ha->dpc_work);
      }

      /* Reschedule timer thread to call us back in one second */
      mod_timer(&ha->timer, jiffies + HZ);

      DEBUG2(ha->seconds_since_last_intr++);
}

/**
 * qla4xxx_cmd_wait - waits for all outstanding commands to complete
 * @ha: Pointer to host adapter structure.
 *
 * This routine stalls the driver until all outstanding commands are returned.
 * Caller must release the Hardware Lock prior to calling this routine.
 **/
static int qla4xxx_cmd_wait(struct scsi_qla_host *ha)
{
      uint32_t index = 0;
      int stat = QLA_SUCCESS;
      unsigned long flags;
      struct scsi_cmnd *cmd;
      int wait_cnt = WAIT_CMD_TOV;  /*
                               * Initialized for 30 seconds as we
                               * expect all commands to retuned
                               * ASAP.
                               */

      while (wait_cnt) {
            spin_lock_irqsave(&ha->hardware_lock, flags);
            /* Find a command that hasn't completed. */
            for (index = 0; index < ha->host->can_queue; index++) {
                  cmd = scsi_host_find_tag(ha->host, index);
                  if (cmd != NULL)
                        break;
            }
            spin_unlock_irqrestore(&ha->hardware_lock, flags);

            /* If No Commands are pending, wait is complete */
            if (index == ha->host->can_queue) {
                  break;
            }

            /* If we timed out on waiting for commands to come back
             * return ERROR.
             */
            wait_cnt--;
            if (wait_cnt == 0)
                  stat = QLA_ERROR;
            else {
                  msleep(1000);
            }
      }                 /* End of While (wait_cnt) */

      return stat;
}

void qla4xxx_hw_reset(struct scsi_qla_host *ha)
{
      uint32_t ctrl_status;
      unsigned long flags = 0;

      DEBUG2(printk(KERN_ERR "scsi%ld: %s\n", ha->host_no, __func__));

      spin_lock_irqsave(&ha->hardware_lock, flags);

      /*
       * If the SCSI Reset Interrupt bit is set, clear it.
       * Otherwise, the Soft Reset won't work.
       */
      ctrl_status = readw(&ha->reg->ctrl_status);
      if ((ctrl_status & CSR_SCSI_RESET_INTR) != 0)
            writel(set_rmask(CSR_SCSI_RESET_INTR), &ha->reg->ctrl_status);

      /* Issue Soft Reset */
      writel(set_rmask(CSR_SOFT_RESET), &ha->reg->ctrl_status);
      readl(&ha->reg->ctrl_status);

      spin_unlock_irqrestore(&ha->hardware_lock, flags);
}

/**
 * qla4xxx_soft_reset - performs soft reset.
 * @ha: Pointer to host adapter structure.
 **/
int qla4xxx_soft_reset(struct scsi_qla_host *ha)
{
      uint32_t max_wait_time;
      unsigned long flags = 0;
      int status = QLA_ERROR;
      uint32_t ctrl_status;

      qla4xxx_hw_reset(ha);

      /* Wait until the Network Reset Intr bit is cleared */
      max_wait_time = RESET_INTR_TOV;
      do {
            spin_lock_irqsave(&ha->hardware_lock, flags);
            ctrl_status = readw(&ha->reg->ctrl_status);
            spin_unlock_irqrestore(&ha->hardware_lock, flags);

            if ((ctrl_status & CSR_NET_RESET_INTR) == 0)
                  break;

            msleep(1000);
      } while ((--max_wait_time));

      if ((ctrl_status & CSR_NET_RESET_INTR) != 0) {
            DEBUG2(printk(KERN_WARNING
                        "scsi%ld: Network Reset Intr not cleared by "
                        "Network function, clearing it now!\n",
                        ha->host_no));
            spin_lock_irqsave(&ha->hardware_lock, flags);
            writel(set_rmask(CSR_NET_RESET_INTR), &ha->reg->ctrl_status);
            readl(&ha->reg->ctrl_status);
            spin_unlock_irqrestore(&ha->hardware_lock, flags);
      }

      /* Wait until the firmware tells us the Soft Reset is done */
      max_wait_time = SOFT_RESET_TOV;
      do {
            spin_lock_irqsave(&ha->hardware_lock, flags);
            ctrl_status = readw(&ha->reg->ctrl_status);
            spin_unlock_irqrestore(&ha->hardware_lock, flags);

            if ((ctrl_status & CSR_SOFT_RESET) == 0) {
                  status = QLA_SUCCESS;
                  break;
            }

            msleep(1000);
      } while ((--max_wait_time));

      /*
       * Also, make sure that the SCSI Reset Interrupt bit has been cleared
       * after the soft reset has taken place.
       */
      spin_lock_irqsave(&ha->hardware_lock, flags);
      ctrl_status = readw(&ha->reg->ctrl_status);
      if ((ctrl_status & CSR_SCSI_RESET_INTR) != 0) {
            writel(set_rmask(CSR_SCSI_RESET_INTR), &ha->reg->ctrl_status);
            readl(&ha->reg->ctrl_status);
      }
      spin_unlock_irqrestore(&ha->hardware_lock, flags);

      /* If soft reset fails then most probably the bios on other
       * function is also enabled.
       * Since the initialization is sequential the other fn
       * wont be able to acknowledge the soft reset.
       * Issue a force soft reset to workaround this scenario.
       */
      if (max_wait_time == 0) {
            /* Issue Force Soft Reset */
            spin_lock_irqsave(&ha->hardware_lock, flags);
            writel(set_rmask(CSR_FORCE_SOFT_RESET), &ha->reg->ctrl_status);
            readl(&ha->reg->ctrl_status);
            spin_unlock_irqrestore(&ha->hardware_lock, flags);
            /* Wait until the firmware tells us the Soft Reset is done */
            max_wait_time = SOFT_RESET_TOV;
            do {
                  spin_lock_irqsave(&ha->hardware_lock, flags);
                  ctrl_status = readw(&ha->reg->ctrl_status);
                  spin_unlock_irqrestore(&ha->hardware_lock, flags);

                  if ((ctrl_status & CSR_FORCE_SOFT_RESET) == 0) {
                        status = QLA_SUCCESS;
                        break;
                  }

                  msleep(1000);
            } while ((--max_wait_time));
      }

      return status;
}

/**
 * qla4xxx_flush_active_srbs - returns all outstanding i/o requests to O.S.
 * @ha: Pointer to host adapter structure.
 *
 * This routine is called just prior to a HARD RESET to return all
 * outstanding commands back to the Operating System.
 * Caller should make sure that the following locks are released
 * before this calling routine: Hardware lock, and io_request_lock.
 **/
static void qla4xxx_flush_active_srbs(struct scsi_qla_host *ha)
{
      struct srb *srb;
      int i;
      unsigned long flags;

      spin_lock_irqsave(&ha->hardware_lock, flags);
      for (i = 0; i < ha->host->can_queue; i++) {
            srb = qla4xxx_del_from_active_array(ha, i);
            if (srb != NULL) {
                  srb->cmd->result = DID_RESET << 16;
                  qla4xxx_srb_compl(ha, srb);
            }
      }
      spin_unlock_irqrestore(&ha->hardware_lock, flags);

}

/**
 * qla4xxx_recover_adapter - recovers adapter after a fatal error
 * @ha: Pointer to host adapter structure.
 * @renew_ddb_list: Indicates what to do with the adapter's ddb list
 *    after adapter recovery has completed.
 *    0=preserve ddb list, 1=destroy and rebuild ddb list
 **/
static int qla4xxx_recover_adapter(struct scsi_qla_host *ha,
                        uint8_t renew_ddb_list)
{
      int status;

      /* Stall incoming I/O until we are done */
      clear_bit(AF_ONLINE, &ha->flags);
      DEBUG2(printk("scsi%ld: %s calling qla4xxx_cmd_wait\n", ha->host_no,
                  __func__));

      /* Wait for outstanding commands to complete.
       * Stalls the driver for max 30 secs
       */
      status = qla4xxx_cmd_wait(ha);

      qla4xxx_disable_intrs(ha);

      /* Flush any pending ddb changed AENs */
      qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);

      /* Reset the firmware.  If successful, function
       * returns with ISP interrupts enabled.
       */
      if (status == QLA_SUCCESS) {
            DEBUG2(printk("scsi%ld: %s - Performing soft reset..\n",
                        ha->host_no, __func__));
            qla4xxx_flush_active_srbs(ha);
            if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS)
                  status = qla4xxx_soft_reset(ha);
            else
                  status = QLA_ERROR;
      }

      /* Flush any pending ddb changed AENs */
      qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);

      /* Re-initialize firmware. If successful, function returns
       * with ISP interrupts enabled */
      if (status == QLA_SUCCESS) {
            DEBUG2(printk("scsi%ld: %s - Initializing adapter..\n",
                        ha->host_no, __func__));

            /* If successful, AF_ONLINE flag set in
             * qla4xxx_initialize_adapter */
            status = qla4xxx_initialize_adapter(ha, renew_ddb_list);
      }

      /* Failed adapter initialization?
       * Retry reset_ha only if invoked via DPC (DPC_RESET_HA) */
      if ((test_bit(AF_ONLINE, &ha->flags) == 0) &&
          (test_bit(DPC_RESET_HA, &ha->dpc_flags))) {
            /* Adapter initialization failed, see if we can retry
             * resetting the ha */
            if (!test_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags)) {
                  ha->retry_reset_ha_cnt = MAX_RESET_HA_RETRIES;
                  DEBUG2(printk("scsi%ld: recover adapter - retrying "
                              "(%d) more times\n", ha->host_no,
                              ha->retry_reset_ha_cnt));
                  set_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
                  status = QLA_ERROR;
            } else {
                  if (ha->retry_reset_ha_cnt > 0) {
                        /* Schedule another Reset HA--DPC will retry */
                        ha->retry_reset_ha_cnt--;
                        DEBUG2(printk("scsi%ld: recover adapter - "
                                    "retry remaining %d\n",
                                    ha->host_no,
                                    ha->retry_reset_ha_cnt));
                        status = QLA_ERROR;
                  }

                  if (ha->retry_reset_ha_cnt == 0) {
                        /* Recover adapter retries have been exhausted.
                         * Adapter DEAD */
                        DEBUG2(printk("scsi%ld: recover adapter "
                                    "failed - board disabled\n",
                                    ha->host_no));
                        qla4xxx_flush_active_srbs(ha);
                        clear_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
                        clear_bit(DPC_RESET_HA, &ha->dpc_flags);
                        clear_bit(DPC_RESET_HA_DESTROY_DDB_LIST,
                                &ha->dpc_flags);
                        status = QLA_ERROR;
                  }
            }
      } else {
            clear_bit(DPC_RESET_HA, &ha->dpc_flags);
            clear_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags);
            clear_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
      }

      ha->adapter_error_count++;

      if (status == QLA_SUCCESS)
            qla4xxx_enable_intrs(ha);

      DEBUG2(printk("scsi%ld: recover adapter .. DONE\n", ha->host_no));
      return status;
}

/**
 * qla4xxx_do_dpc - dpc routine
 * @data: in our case pointer to adapter structure
 *
 * This routine is a task that is schedule by the interrupt handler
 * to perform the background processing for interrupts.  We put it
 * on a task queue that is consumed whenever the scheduler runs; that's
 * so you can do anything (i.e. put the process to sleep etc).  In fact,
 * the mid-level tries to sleep when it reaches the driver threshold
 * "host->can_queue". This can cause a panic if we were in our interrupt code.
 **/
static void qla4xxx_do_dpc(struct work_struct *work)
{
      struct scsi_qla_host *ha =
            container_of(work, struct scsi_qla_host, dpc_work);
      struct ddb_entry *ddb_entry, *dtemp;
      int status = QLA_ERROR;

      DEBUG2(printk("scsi%ld: %s: DPC handler waking up."
            "flags = 0x%08lx, dpc_flags = 0x%08lx ctrl_stat = 0x%08x\n",
            ha->host_no, __func__, ha->flags, ha->dpc_flags,
            readw(&ha->reg->ctrl_status)));

      /* Initialization not yet finished. Don't do anything yet. */
      if (!test_bit(AF_INIT_DONE, &ha->flags))
            return;

      if (adapter_up(ha) ||
          test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
          test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags) ||
          test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags)) {
            if (test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags) ||
                  test_bit(DPC_RESET_HA, &ha->dpc_flags))
                  qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST);

            if (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags)) {
                  uint8_t wait_time = RESET_INTR_TOV;

                  while ((readw(&ha->reg->ctrl_status) &
                        (CSR_SOFT_RESET | CSR_FORCE_SOFT_RESET)) != 0) {
                        if (--wait_time == 0)
                              break;
                        msleep(1000);
                  }
                  if (wait_time == 0)
                        DEBUG2(printk("scsi%ld: %s: SR|FSR "
                                    "bit not cleared-- resetting\n",
                                    ha->host_no, __func__));
                  qla4xxx_flush_active_srbs(ha);
                  if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS) {
                        qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
                        status = qla4xxx_initialize_adapter(ha,
                                    PRESERVE_DDB_LIST);
                  }
                  clear_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
                  if (status == QLA_SUCCESS)
                        qla4xxx_enable_intrs(ha);
            }
      }

      /* ---- process AEN? --- */
      if (test_and_clear_bit(DPC_AEN, &ha->dpc_flags))
            qla4xxx_process_aen(ha, PROCESS_ALL_AENS);

      /* ---- Get DHCP IP Address? --- */
      if (test_and_clear_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags))
            qla4xxx_get_dhcp_ip_address(ha);

      /* ---- relogin device? --- */
      if (adapter_up(ha) &&
          test_and_clear_bit(DPC_RELOGIN_DEVICE, &ha->dpc_flags)) {
            list_for_each_entry_safe(ddb_entry, dtemp,
                               &ha->ddb_list, list) {
                  if (test_and_clear_bit(DF_RELOGIN, &ddb_entry->flags) &&
                      atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE)
                        qla4xxx_relogin_device(ha, ddb_entry);

                  /*
                   * If mbx cmd times out there is no point
                   * in continuing further.
                   * With large no of targets this can hang
                   * the system.
                   */
                  if (test_bit(DPC_RESET_HA, &ha->dpc_flags)) {
                        printk(KERN_WARNING "scsi%ld: %s: "
                               "need to reset hba\n",
                               ha->host_no, __func__);
                        break;
                  }
            }
      }
}

/**
 * qla4xxx_free_adapter - release the adapter
 * @ha: pointer to adapter structure
 **/
static void qla4xxx_free_adapter(struct scsi_qla_host *ha)
{

      if (test_bit(AF_INTERRUPTS_ON, &ha->flags)) {
            /* Turn-off interrupts on the card. */
            qla4xxx_disable_intrs(ha);
      }

      /* Kill the kernel thread for this host */
      if (ha->dpc_thread)
            destroy_workqueue(ha->dpc_thread);

      /* Issue Soft Reset to put firmware in unknown state */
      if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS)
            qla4xxx_hw_reset(ha);

      /* Remove timer thread, if present */
      if (ha->timer_active)
            qla4xxx_stop_timer(ha);

      /* Detach interrupts */
      if (test_and_clear_bit(AF_IRQ_ATTACHED, &ha->flags))
            free_irq(ha->pdev->irq, ha);

      /* free extra memory */
      qla4xxx_mem_free(ha);

      pci_disable_device(ha->pdev);

}

/***
 * qla4xxx_iospace_config - maps registers
 * @ha: pointer to adapter structure
 *
 * This routines maps HBA's registers from the pci address space
 * into the kernel virtual address space for memory mapped i/o.
 **/
static int qla4xxx_iospace_config(struct scsi_qla_host *ha)
{
      unsigned long pio, pio_len, pio_flags;
      unsigned long mmio, mmio_len, mmio_flags;

      pio = pci_resource_start(ha->pdev, 0);
      pio_len = pci_resource_len(ha->pdev, 0);
      pio_flags = pci_resource_flags(ha->pdev, 0);
      if (pio_flags & IORESOURCE_IO) {
            if (pio_len < MIN_IOBASE_LEN) {
                  dev_warn(&ha->pdev->dev,
                        "Invalid PCI I/O region size\n");
                  pio = 0;
            }
      } else {
            dev_warn(&ha->pdev->dev, "region #0 not a PIO resource\n");
            pio = 0;
      }

      /* Use MMIO operations for all accesses. */
      mmio = pci_resource_start(ha->pdev, 1);
      mmio_len = pci_resource_len(ha->pdev, 1);
      mmio_flags = pci_resource_flags(ha->pdev, 1);

      if (!(mmio_flags & IORESOURCE_MEM)) {
            dev_err(&ha->pdev->dev,
                  "region #0 not an MMIO resource, aborting\n");

            goto iospace_error_exit;
      }
      if (mmio_len < MIN_IOBASE_LEN) {
            dev_err(&ha->pdev->dev,
                  "Invalid PCI mem region size, aborting\n");
            goto iospace_error_exit;
      }

      if (pci_request_regions(ha->pdev, DRIVER_NAME)) {
            dev_warn(&ha->pdev->dev,
                  "Failed to reserve PIO/MMIO regions\n");

            goto iospace_error_exit;
      }

      ha->pio_address = pio;
      ha->pio_length = pio_len;
      ha->reg = ioremap(mmio, MIN_IOBASE_LEN);
      if (!ha->reg) {
            dev_err(&ha->pdev->dev,
                  "cannot remap MMIO, aborting\n");

            goto iospace_error_exit;
      }

      return 0;

iospace_error_exit:
      return -ENOMEM;
}

/**
 * qla4xxx_probe_adapter - callback function to probe HBA
 * @pdev: pointer to pci_dev structure
 * @pci_device_id: pointer to pci_device entry
 *
 * This routine will probe for Qlogic 4xxx iSCSI host adapters.
 * It returns zero if successful. It also initializes all data necessary for
 * the driver.
 **/
static int __devinit qla4xxx_probe_adapter(struct pci_dev *pdev,
                                 const struct pci_device_id *ent)
{
      int ret = -ENODEV, status;
      struct Scsi_Host *host;
      struct scsi_qla_host *ha;
      struct ddb_entry *ddb_entry, *ddbtemp;
      uint8_t init_retry_count = 0;
      char buf[34];

      if (pci_enable_device(pdev))
            return -1;

      host = scsi_host_alloc(&qla4xxx_driver_template, sizeof(*ha));
      if (host == NULL) {
            printk(KERN_WARNING
                   "qla4xxx: Couldn't allocate host from scsi layer!\n");
            goto probe_disable_device;
      }

      /* Clear our data area */
      ha = (struct scsi_qla_host *) host->hostdata;
      memset(ha, 0, sizeof(*ha));

      /* Save the information from PCI BIOS.    */
      ha->pdev = pdev;
      ha->host = host;
      ha->host_no = host->host_no;

      /* Configure PCI I/O space. */
      ret = qla4xxx_iospace_config(ha);
      if (ret)
            goto probe_failed;

      dev_info(&ha->pdev->dev, "Found an ISP%04x, irq %d, iobase 0x%p\n",
               pdev->device, pdev->irq, ha->reg);

      qla4xxx_config_dma_addressing(ha);

      /* Initialize lists and spinlocks. */
      INIT_LIST_HEAD(&ha->ddb_list);
      INIT_LIST_HEAD(&ha->free_srb_q);

      mutex_init(&ha->mbox_sem);

      spin_lock_init(&ha->hardware_lock);

      /* Allocate dma buffers */
      if (qla4xxx_mem_alloc(ha)) {
            dev_warn(&ha->pdev->dev,
                     "[ERROR] Failed to allocate memory for adapter\n");

            ret = -ENOMEM;
            goto probe_failed;
      }

      /*
       * Initialize the Host adapter request/response queues and
       * firmware
       * NOTE: interrupts enabled upon successful completion
       */
      status = qla4xxx_initialize_adapter(ha, REBUILD_DDB_LIST);
      while (status == QLA_ERROR && init_retry_count++ < MAX_INIT_RETRIES) {
            DEBUG2(printk("scsi: %s: retrying adapter initialization "
                        "(%d)\n", __func__, init_retry_count));
            qla4xxx_soft_reset(ha);
            status = qla4xxx_initialize_adapter(ha, REBUILD_DDB_LIST);
      }
      if (status == QLA_ERROR) {
            dev_warn(&ha->pdev->dev, "Failed to initialize adapter\n");

            ret = -ENODEV;
            goto probe_failed;
      }

      host->cmd_per_lun = 3;
      host->max_channel = 0;
      host->max_lun = MAX_LUNS - 1;
      host->max_id = MAX_TARGETS;
      host->max_cmd_len = IOCB_MAX_CDB_LEN;
      host->can_queue = MAX_SRBS ;
      host->transportt = qla4xxx_scsi_transport;

        ret = scsi_init_shared_tag_map(host, MAX_SRBS);
        if (ret) {
                dev_warn(&ha->pdev->dev, "scsi_init_shared_tag_map failed\n");
                goto probe_failed;
        }

      /* Startup the kernel thread for this host adapter. */
      DEBUG2(printk("scsi: %s: Starting kernel thread for "
                  "qla4xxx_dpc\n", __func__));
      sprintf(buf, "qla4xxx_%lu_dpc", ha->host_no);
      ha->dpc_thread = create_singlethread_workqueue(buf);
      if (!ha->dpc_thread) {
            dev_warn(&ha->pdev->dev, "Unable to start DPC thread!\n");
            ret = -ENODEV;
            goto probe_failed;
      }
      INIT_WORK(&ha->dpc_work, qla4xxx_do_dpc);

      ret = request_irq(pdev->irq, qla4xxx_intr_handler,
                    IRQF_DISABLED | IRQF_SHARED, "qla4xxx", ha);
      if (ret) {
            dev_warn(&ha->pdev->dev, "Failed to reserve interrupt %d"
                  " already in use.\n", pdev->irq);
            goto probe_failed;
      }
      set_bit(AF_IRQ_ATTACHED, &ha->flags);
      host->irq = pdev->irq;
      DEBUG(printk("scsi%d: irq %d attached\n", ha->host_no, ha->pdev->irq));

      qla4xxx_enable_intrs(ha);

      /* Start timer thread. */
      qla4xxx_start_timer(ha, qla4xxx_timer, 1);

      set_bit(AF_INIT_DONE, &ha->flags);

      pci_set_drvdata(pdev, ha);

      ret = scsi_add_host(host, &pdev->dev);
      if (ret)
            goto probe_failed;

      /* Update transport device information for all devices. */
      list_for_each_entry_safe(ddb_entry, ddbtemp, &ha->ddb_list, list) {
            if (ddb_entry->fw_ddb_device_state == DDB_DS_SESSION_ACTIVE)
                  if (qla4xxx_add_sess(ddb_entry))
                        goto remove_host;
      }

      printk(KERN_INFO
             " QLogic iSCSI HBA Driver version: %s\n"
             "  QLogic ISP%04x @ %s, host#=%ld, fw=%02d.%02d.%02d.%02d\n",
             qla4xxx_version_str, ha->pdev->device, pci_name(ha->pdev),
             ha->host_no, ha->firmware_version[0], ha->firmware_version[1],
             ha->patch_number, ha->build_number);

      return 0;

remove_host:
      qla4xxx_free_ddb_list(ha);
      scsi_remove_host(host);

probe_failed:
      qla4xxx_free_adapter(ha);
      scsi_host_put(ha->host);

probe_disable_device:
      pci_disable_device(pdev);

      return ret;
}

/**
 * qla4xxx_remove_adapter - calback function to remove adapter.
 * @pci_dev: PCI device pointer
 **/
static void __devexit qla4xxx_remove_adapter(struct pci_dev *pdev)
{
      struct scsi_qla_host *ha;

      ha = pci_get_drvdata(pdev);

      qla4xxx_disable_intrs(ha);

      while (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags))
            ssleep(1);

      /* remove devs from iscsi_sessions to scsi_devices */
      qla4xxx_free_ddb_list(ha);

      scsi_remove_host(ha->host);

      qla4xxx_free_adapter(ha);

      scsi_host_put(ha->host);

      pci_set_drvdata(pdev, NULL);
}

/**
 * qla4xxx_config_dma_addressing() - Configure OS DMA addressing method.
 * @ha: HA context
 *
 * At exit, the @ha's flags.enable_64bit_addressing set to indicated
 * supported addressing method.
 */
static void qla4xxx_config_dma_addressing(struct scsi_qla_host *ha)
{
      int retval;

      /* Update our PCI device dma_mask for full 64 bit mask */
      if (pci_set_dma_mask(ha->pdev, DMA_64BIT_MASK) == 0) {
            if (pci_set_consistent_dma_mask(ha->pdev, DMA_64BIT_MASK)) {
                  dev_dbg(&ha->pdev->dev,
                          "Failed to set 64 bit PCI consistent mask; "
                           "using 32 bit.\n");
                  retval = pci_set_consistent_dma_mask(ha->pdev,
                                               DMA_32BIT_MASK);
            }
      } else
            retval = pci_set_dma_mask(ha->pdev, DMA_32BIT_MASK);
}

static int qla4xxx_slave_alloc(struct scsi_device *sdev)
{
      struct iscsi_cls_session *sess = starget_to_session(sdev->sdev_target);
      struct ddb_entry *ddb = sess->dd_data;

      sdev->hostdata = ddb;
      sdev->tagged_supported = 1;
      scsi_activate_tcq(sdev, sdev->host->can_queue);
      return 0;
}

static int qla4xxx_slave_configure(struct scsi_device *sdev)
{
      sdev->tagged_supported = 1;
      return 0;
}

static void qla4xxx_slave_destroy(struct scsi_device *sdev)
{
      scsi_deactivate_tcq(sdev, 1);
}

/**
 * qla4xxx_del_from_active_array - returns an active srb
 * @ha: Pointer to host adapter structure.
 * @index: index into to the active_array
 *
 * This routine removes and returns the srb at the specified index
 **/
struct srb * qla4xxx_del_from_active_array(struct scsi_qla_host *ha, uint32_t index)
{
      struct srb *srb = NULL;
      struct scsi_cmnd *cmd;

      if (!(cmd = scsi_host_find_tag(ha->host, index)))
            return srb;

      if (!(srb = (struct srb *)cmd->host_scribble))
            return srb;

      /* update counters */
      if (srb->flags & SRB_DMA_VALID) {
            ha->req_q_count += srb->iocb_cnt;
            ha->iocb_cnt -= srb->iocb_cnt;
            if (srb->cmd)
                  srb->cmd->host_scribble = NULL;
      }
      return srb;
}

/**
 * qla4xxx_eh_wait_on_command - waits for command to be returned by firmware
 * @ha: actual ha whose done queue will contain the comd returned by firmware.
 * @cmd: Scsi Command to wait on.
 *
 * This routine waits for the command to be returned by the Firmware
 * for some max time.
 **/
static int qla4xxx_eh_wait_on_command(struct scsi_qla_host *ha,
                              struct scsi_cmnd *cmd)
{
      int done = 0;
      struct srb *rp;
      uint32_t max_wait_time = EH_WAIT_CMD_TOV;

      do {
            /* Checking to see if its returned to OS */
            rp = (struct srb *) cmd->SCp.ptr;
            if (rp == NULL) {
                  done++;
                  break;
            }

            msleep(2000);
      } while (max_wait_time--);

      return done;
}

/**
 * qla4xxx_wait_for_hba_online - waits for HBA to come online
 * @ha: Pointer to host adapter structure
 **/
static int qla4xxx_wait_for_hba_online(struct scsi_qla_host *ha)
{
      unsigned long wait_online;

      wait_online = jiffies + (30 * HZ);
      while (time_before(jiffies, wait_online)) {

            if (adapter_up(ha))
                  return QLA_SUCCESS;
            else if (ha->retry_reset_ha_cnt == 0)
                  return QLA_ERROR;

            msleep(2000);
      }

      return QLA_ERROR;
}

/**
 * qla4xxx_eh_wait_for_active_target_commands - wait for active cmds to finish.
 * @ha: pointer to to HBA
 * @t: target id
 * @l: lun id
 *
 * This function waits for all outstanding commands to a lun to complete. It
 * returns 0 if all pending commands are returned and 1 otherwise.
 **/
static int qla4xxx_eh_wait_for_active_target_commands(struct scsi_qla_host *ha,
                                     int t, int l)
{
      int cnt;
      int status = 0;
      struct scsi_cmnd *cmd;

      /*
       * Waiting for all commands for the designated target in the active
       * array
       */
      for (cnt = 0; cnt < ha->host->can_queue; cnt++) {
            cmd = scsi_host_find_tag(ha->host, cnt);
            if (cmd && cmd->device->id == t && cmd->device->lun == l) {
                  if (!qla4xxx_eh_wait_on_command(ha, cmd)) {
                        status++;
                        break;
                  }
            }
      }
      return status;
}

/**
 * qla4xxx_eh_device_reset - callback for target reset.
 * @cmd: Pointer to Linux's SCSI command structure
 *
 * This routine is called by the Linux OS to reset all luns on the
 * specified target.
 **/
static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd)
{
      struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
      struct ddb_entry *ddb_entry = cmd->device->hostdata;
      struct srb *sp;
      int ret = FAILED, stat;

      sp = (struct srb *) cmd->SCp.ptr;
      if (!sp || !ddb_entry)
            return ret;

      dev_info(&ha->pdev->dev,
               "scsi%ld:%d:%d:%d: DEVICE RESET ISSUED.\n", ha->host_no,
               cmd->device->channel, cmd->device->id, cmd->device->lun);

      DEBUG2(printk(KERN_INFO
                  "scsi%ld: DEVICE_RESET cmd=%p jiffies = 0x%lx, to=%x,"
                  "dpc_flags=%lx, status=%x allowed=%d\n", ha->host_no,
                  cmd, jiffies, cmd->timeout_per_command / HZ,
                  ha->dpc_flags, cmd->result, cmd->allowed));

      /* FIXME: wait for hba to go online */
      stat = qla4xxx_reset_lun(ha, ddb_entry, cmd->device->lun);
      if (stat != QLA_SUCCESS) {
            dev_info(&ha->pdev->dev, "DEVICE RESET FAILED. %d\n", stat);
            goto eh_dev_reset_done;
      }

      /* Send marker. */
      ha->marker_needed = 1;

      /*
       * If we are coming down the EH path, wait for all commands to complete
       * for the device.
       */
      if (cmd->device->host->shost_state == SHOST_RECOVERY) {
            if (qla4xxx_eh_wait_for_active_target_commands(ha,
                                            cmd->device->id,
                                            cmd->device->lun)){
                  dev_info(&ha->pdev->dev,
                           "DEVICE RESET FAILED - waiting for "
                           "commands.\n");
                  goto eh_dev_reset_done;
            }
      }

      dev_info(&ha->pdev->dev,
               "scsi(%ld:%d:%d:%d): DEVICE RESET SUCCEEDED.\n",
               ha->host_no, cmd->device->channel, cmd->device->id,
               cmd->device->lun);

      ret = SUCCESS;

eh_dev_reset_done:

      return ret;
}

/**
 * qla4xxx_eh_host_reset - kernel callback
 * @cmd: Pointer to Linux's SCSI command structure
 *
 * This routine is invoked by the Linux kernel to perform fatal error
 * recovery on the specified adapter.
 **/
static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd)
{
      int return_status = FAILED;
      struct scsi_qla_host *ha;

      ha = (struct scsi_qla_host *) cmd->device->host->hostdata;

      dev_info(&ha->pdev->dev,
               "scsi(%ld:%d:%d:%d): ADAPTER RESET ISSUED.\n", ha->host_no,
               cmd->device->channel, cmd->device->id, cmd->device->lun);

      if (qla4xxx_wait_for_hba_online(ha) != QLA_SUCCESS) {
            DEBUG2(printk("scsi%ld:%d: %s: Unable to reset host.  Adapter "
                        "DEAD.\n", ha->host_no, cmd->device->channel,
                        __func__));

            return FAILED;
      }

      if (qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST) == QLA_SUCCESS) {
            return_status = SUCCESS;
      }

      dev_info(&ha->pdev->dev, "HOST RESET %s.\n",
               return_status == FAILED ? "FAILED" : "SUCCEDED");

      return return_status;
}


static struct pci_device_id qla4xxx_pci_tbl[] = {
      {
            .vendor           = PCI_VENDOR_ID_QLOGIC,
            .device           = PCI_DEVICE_ID_QLOGIC_ISP4010,
            .subvendor  = PCI_ANY_ID,
            .subdevice  = PCI_ANY_ID,
      },
      {
            .vendor           = PCI_VENDOR_ID_QLOGIC,
            .device           = PCI_DEVICE_ID_QLOGIC_ISP4022,
            .subvendor  = PCI_ANY_ID,
            .subdevice  = PCI_ANY_ID,
      },
      {
            .vendor           = PCI_VENDOR_ID_QLOGIC,
            .device           = PCI_DEVICE_ID_QLOGIC_ISP4032,
            .subvendor  = PCI_ANY_ID,
            .subdevice  = PCI_ANY_ID,
      },
      {0, 0},
};
MODULE_DEVICE_TABLE(pci, qla4xxx_pci_tbl);

static struct pci_driver qla4xxx_pci_driver = {
      .name       = DRIVER_NAME,
      .id_table   = qla4xxx_pci_tbl,
      .probe            = qla4xxx_probe_adapter,
      .remove           = qla4xxx_remove_adapter,
};

static int __init qla4xxx_module_init(void)
{
      int ret;

      /* Allocate cache for SRBs. */
      srb_cachep = kmem_cache_create("qla4xxx_srbs", sizeof(struct srb), 0,
                               SLAB_HWCACHE_ALIGN, NULL);
      if (srb_cachep == NULL) {
            printk(KERN_ERR
                   "%s: Unable to allocate SRB cache..."
                   "Failing load!\n", DRIVER_NAME);
            ret = -ENOMEM;
            goto no_srp_cache;
      }

      /* Derive version string. */
      strcpy(qla4xxx_version_str, QLA4XXX_DRIVER_VERSION);
      if (ql4xextended_error_logging)
            strcat(qla4xxx_version_str, "-debug");

      qla4xxx_scsi_transport =
            iscsi_register_transport(&qla4xxx_iscsi_transport);
      if (!qla4xxx_scsi_transport){
            ret = -ENODEV;
            goto release_srb_cache;
      }

      ret = pci_register_driver(&qla4xxx_pci_driver);
      if (ret)
            goto unregister_transport;

      printk(KERN_INFO "QLogic iSCSI HBA Driver\n");
      return 0;

unregister_transport:
      iscsi_unregister_transport(&qla4xxx_iscsi_transport);
release_srb_cache:
      kmem_cache_destroy(srb_cachep);
no_srp_cache:
      return ret;
}

static void __exit qla4xxx_module_exit(void)
{
      ql4_mod_unload = 1;
      pci_unregister_driver(&qla4xxx_pci_driver);
      iscsi_unregister_transport(&qla4xxx_iscsi_transport);
      kmem_cache_destroy(srb_cachep);
}

module_init(qla4xxx_module_init);
module_exit(qla4xxx_module_exit);

MODULE_AUTHOR("QLogic Corporation");
MODULE_DESCRIPTION("QLogic iSCSI HBA Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(QLA4XXX_DRIVER_VERSION);

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