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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * pmcraid.c -- driver for PMC Sierra MaxRAID controller adapters
  *
  * Written By: Anil Ravindranath<anil_ravindranath@pmc-sierra.com>
  *             PMC-Sierra Inc
  *
  * Copyright (C) 2008, 2009 PMC Sierra Inc
  */
 #include <linux/fs.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/errno.h>
 #include <linux/kernel.h>
 #include <linux/ioport.h>
 #include <linux/delay.h>
 #include <linux/pci.h>
 #include <linux/wait.h>
 #include <linux/spinlock.h>
 #include <linux/sched.h>
 #include <linux/interrupt.h>
 #include <linux/blkdev.h>
 #include <linux/firmware.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/hdreg.h>
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <asm/irq.h>
 #include <asm/processor.h>
 #include <linux/libata.h>
 #include <linux/mutex.h>
 #include <linux/ktime.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_tcq.h>
 #include <scsi/scsi_eh.h>
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsicam.h>
 
 #include "pmcraid.h"
 
 /*
  *   Module configuration parameters
  */
 static unsigned int pmcraid_debug_log;
 static unsigned int pmcraid_disable_aen;
 static unsigned int pmcraid_log_level = IOASC_LOG_LEVEL_MUST;
 static unsigned int pmcraid_enable_msix;
 
 /*
  * Data structures to support multiple adapters by the LLD.
  * pmcraid_adapter_count - count of configured adapters
  */
 static atomic_t pmcraid_adapter_count = ATOMIC_INIT(0);
 
 /*
  * Supporting user-level control interface through IOCTL commands.
  * pmcraid_major - major number to use
  * pmcraid_minor - minor number(s) to use
  */
 static unsigned int pmcraid_major;
 static struct class *pmcraid_class;
 static DECLARE_BITMAP(pmcraid_minor, PMCRAID_MAX_ADAPTERS);
 
 /*
  * Module parameters
  */
 MODULE_AUTHOR("Anil Ravindranath<anil_ravindranath@pmc-sierra.com>");
 MODULE_DESCRIPTION("PMC Sierra MaxRAID Controller Driver");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(PMCRAID_DRIVER_VERSION);
 
 module_param_named(log_level, pmcraid_log_level, uint, (S_IRUGO | S_IWUSR));
 MODULE_PARM_DESC(log_level,
          "Enables firmware error code logging, default :1 high-severity"
          " errors, 2: all errors including high-severity errors,"
          " 0: disables logging");
 
 module_param_named(debug, pmcraid_debug_log, uint, (S_IRUGO | S_IWUSR));
 MODULE_PARM_DESC(debug,
          "Enable driver verbose message logging. Set 1 to enable."
          "(default: 0)");
 
 module_param_named(disable_aen, pmcraid_disable_aen, uint, (S_IRUGO | S_IWUSR));
 MODULE_PARM_DESC(disable_aen,
          "Disable driver aen notifications to apps. Set 1 to disable."
          "(default: 0)");
 
 /* chip specific constants for PMC MaxRAID controllers (same for
  * 0x5220 and 0x8010
  */
 static struct pmcraid_chip_details pmcraid_chip_cfg[] = {
     {
      .ioastatus = 0x0,
      .ioarrin = 0x00040,
      .mailbox = 0x7FC30,
      .global_intr_mask = 0x00034,
      .ioa_host_intr = 0x0009C,
      .ioa_host_intr_clr = 0x000A0,
      .ioa_host_msix_intr = 0x7FC40,
      .ioa_host_mask = 0x7FC28,
      .ioa_host_mask_clr = 0x7FC28,
      .host_ioa_intr = 0x00020,
      .host_ioa_intr_clr = 0x00020,
      .transop_timeout = 300
      }
 };
 
 /*
  * PCI device ids supported by pmcraid driver
  */
 static struct pci_device_id pmcraid_pci_table[] = {
     { PCI_DEVICE(PCI_VENDOR_ID_PMC, PCI_DEVICE_ID_PMC_MAXRAID),
       0, 0, (kernel_ulong_t)&pmcraid_chip_cfg[0]
     },
     {}
 };
 
 MODULE_DEVICE_TABLE(pci, pmcraid_pci_table);
 
 
 
 /**
  * pmcraid_slave_alloc - Prepare for commands to a device
  * @scsi_dev: scsi device struct
  *
  * This function is called by mid-layer prior to sending any command to the new
  * device. Stores resource entry details of the device in scsi_device struct.
  * Queuecommand uses the resource handle and other details to fill up IOARCB
  * while sending commands to the device.
  *
  * Return value:
  *    0 on success / -ENXIO if device does not exist
  */
 static int pmcraid_slave_alloc(struct scsi_device *scsi_dev)
 {
     struct pmcraid_resource_entry *temp, *res = NULL;
     struct pmcraid_instance *pinstance;
     u8 target, bus, lun;
     unsigned long lock_flags;
     int rc = -ENXIO;
     u16 fw_version;
 
     pinstance = shost_priv(scsi_dev->host);
 
     fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
 
     /* Driver exposes VSET and GSCSI resources only; all other device types
      * are not exposed. Resource list is synchronized using resource lock
      * so any traversal or modifications to the list should be done inside
      * this lock
      */
     spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
     list_for_each_entry(temp, &pinstance->used_res_q, queue) {
 
         /* do not expose VSETs with order-ids > MAX_VSET_TARGETS */
         if (RES_IS_VSET(temp->cfg_entry)) {
             if (fw_version <= PMCRAID_FW_VERSION_1)
                 target = temp->cfg_entry.unique_flags1;
             else
                 target = le16_to_cpu(temp->cfg_entry.array_id) & 0xFF;
 
             if (target > PMCRAID_MAX_VSET_TARGETS)
                 continue;
             bus = PMCRAID_VSET_BUS_ID;
             lun = 0;
         } else if (RES_IS_GSCSI(temp->cfg_entry)) {
             target = RES_TARGET(temp->cfg_entry.resource_address);
             bus = PMCRAID_PHYS_BUS_ID;
             lun = RES_LUN(temp->cfg_entry.resource_address);
         } else {
             continue;
         }
 
         if (bus == scsi_dev->channel &&
             target == scsi_dev->id &&
             lun == scsi_dev->lun) {
             res = temp;
             break;
         }
     }
 
     if (res) {
         res->scsi_dev = scsi_dev;
         scsi_dev->hostdata = res;
         res->change_detected = 0;
         atomic_set(&res->read_failures, 0);
         atomic_set(&res->write_failures, 0);
         rc = 0;
     }
     spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
     return rc;
 }
 
 /**
  * pmcraid_slave_configure - Configures a SCSI device
  * @scsi_dev: scsi device struct
  *
  * This function is executed by SCSI mid layer just after a device is first
  * scanned (i.e. it has responded to an INQUIRY). For VSET resources, the
  * timeout value (default 30s) will be over-written to a higher value (60s)
  * and max_sectors value will be over-written to 512. It also sets queue depth
  * to host->cmd_per_lun value
  *
  * Return value:
  *    0 on success
  */
 static int pmcraid_slave_configure(struct scsi_device *scsi_dev)
 {
     struct pmcraid_resource_entry *res = scsi_dev->hostdata;
 
     if (!res)
         return 0;
 
     /* LLD exposes VSETs and Enclosure devices only */
     if (RES_IS_GSCSI(res->cfg_entry) &&
         scsi_dev->type != TYPE_ENCLOSURE)
         return -ENXIO;
 
     pmcraid_info("configuring %x:%x:%x:%x\n",
              scsi_dev->host->unique_id,
              scsi_dev->channel,
              scsi_dev->id,
              (u8)scsi_dev->lun);
 
     if (RES_IS_GSCSI(res->cfg_entry)) {
         scsi_dev->allow_restart = 1;
     } else if (RES_IS_VSET(res->cfg_entry)) {
         scsi_dev->allow_restart = 1;
         blk_queue_rq_timeout(scsi_dev->request_queue,
                      PMCRAID_VSET_IO_TIMEOUT);
         blk_queue_max_hw_sectors(scsi_dev->request_queue,
                       PMCRAID_VSET_MAX_SECTORS);
     }
 
     /*
      * We never want to report TCQ support for these types of devices.
      */
     if (!RES_IS_GSCSI(res->cfg_entry) && !RES_IS_VSET(res->cfg_entry))
         scsi_dev->tagged_supported = 0;
 
     return 0;
 }
 
 /**
  * pmcraid_slave_destroy - Unconfigure a SCSI device before removing it
  *
  * @scsi_dev: scsi device struct
  *
  * This is called by mid-layer before removing a device. Pointer assignments
  * done in pmcraid_slave_alloc will be reset to NULL here.
  *
  * Return value
  *   none
  */
 static void pmcraid_slave_destroy(struct scsi_device *scsi_dev)
 {
     struct pmcraid_resource_entry *res;
 
     res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
 
     if (res)
         res->scsi_dev = NULL;
 
     scsi_dev->hostdata = NULL;
 }
 
 /**
  * pmcraid_change_queue_depth - Change the device's queue depth
  * @scsi_dev: scsi device struct
  * @depth: depth to set
  *
  * Return value
  *  actual depth set
  */
 static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth)
 {
     if (depth > PMCRAID_MAX_CMD_PER_LUN)
         depth = PMCRAID_MAX_CMD_PER_LUN;
     return scsi_change_queue_depth(scsi_dev, depth);
 }
 
 /**
  * pmcraid_init_cmdblk - initializes a command block
  *
  * @cmd: pointer to struct pmcraid_cmd to be initialized
  * @index: if >=0 first time initialization; otherwise reinitialization
  *
  * Return Value
  *   None
  */
 static void pmcraid_init_cmdblk(struct pmcraid_cmd *cmd, int index)
 {
     struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
     dma_addr_t dma_addr = cmd->ioa_cb_bus_addr;
 
     if (index >= 0) {
         /* first time initialization (called from  probe) */
         u32 ioasa_offset =
             offsetof(struct pmcraid_control_block, ioasa);
 
         cmd->index = index;
         ioarcb->response_handle = cpu_to_le32(index << 2);
         ioarcb->ioarcb_bus_addr = cpu_to_le64(dma_addr);
         ioarcb->ioasa_bus_addr = cpu_to_le64(dma_addr + ioasa_offset);
         ioarcb->ioasa_len = cpu_to_le16(sizeof(struct pmcraid_ioasa));
     } else {
         /* re-initialization of various lengths, called once command is
          * processed by IOA
          */
         memset(&cmd->ioa_cb->ioarcb.cdb, 0, PMCRAID_MAX_CDB_LEN);
         ioarcb->hrrq_id = 0;
         ioarcb->request_flags0 = 0;
         ioarcb->request_flags1 = 0;
         ioarcb->cmd_timeout = 0;
         ioarcb->ioarcb_bus_addr &= cpu_to_le64(~0x1FULL);
         ioarcb->ioadl_bus_addr = 0;
         ioarcb->ioadl_length = 0;
         ioarcb->data_transfer_length = 0;
         ioarcb->add_cmd_param_length = 0;
         ioarcb->add_cmd_param_offset = 0;
         cmd->ioa_cb->ioasa.ioasc = 0;
         cmd->ioa_cb->ioasa.residual_data_length = 0;
         cmd->time_left = 0;
     }
 
     cmd->cmd_done = NULL;
     cmd->scsi_cmd = NULL;
     cmd->release = 0;
     cmd->completion_req = 0;
     cmd->sense_buffer = NULL;
     cmd->sense_buffer_dma = 0;
     cmd->dma_handle = 0;
     timer_setup(&cmd->timer, NULL, 0);
 }
 
 /**
  * pmcraid_reinit_cmdblk - reinitialize a command block
  *
  * @cmd: pointer to struct pmcraid_cmd to be reinitialized
  *
  * Return Value
  *   None
  */
 static void pmcraid_reinit_cmdblk(struct pmcraid_cmd *cmd)
 {
     pmcraid_init_cmdblk(cmd, -1);
 }
 
 /**
  * pmcraid_get_free_cmd - get a free cmd block from command block pool
  * @pinstance: adapter instance structure
  *
  * Return Value:
  *  returns pointer to cmd block or NULL if no blocks are available
  */
 static struct pmcraid_cmd *pmcraid_get_free_cmd(
     struct pmcraid_instance *pinstance
 )
 {
     struct pmcraid_cmd *cmd = NULL;
     unsigned long lock_flags;
 
     /* free cmd block list is protected by free_pool_lock */
     spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
 
     if (!list_empty(&pinstance->free_cmd_pool)) {
         cmd = list_entry(pinstance->free_cmd_pool.next,
                  struct pmcraid_cmd, free_list);
         list_del(&cmd->free_list);
     }
     spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
 
     /* Initialize the command block before giving it the caller */
     if (cmd != NULL)
         pmcraid_reinit_cmdblk(cmd);
     return cmd;
 }
 
 /**
  * pmcraid_return_cmd - return a completed command block back into free pool
  * @cmd: pointer to the command block
  *
  * Return Value:
  *  nothing
  */
 static void pmcraid_return_cmd(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     unsigned long lock_flags;
 
     spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
     list_add_tail(&cmd->free_list, &pinstance->free_cmd_pool);
     spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
 }
 
 /**
  * pmcraid_read_interrupts -  reads IOA interrupts
  *
  * @pinstance: pointer to adapter instance structure
  *
  * Return value
  *   interrupts read from IOA
  */
 static u32 pmcraid_read_interrupts(struct pmcraid_instance *pinstance)
 {
     return (pinstance->interrupt_mode) ?
         ioread32(pinstance->int_regs.ioa_host_msix_interrupt_reg) :
         ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
 }
 
 /**
  * pmcraid_disable_interrupts - Masks and clears all specified interrupts
  *
  * @pinstance: pointer to per adapter instance structure
  * @intrs: interrupts to disable
  *
  * Return Value
  *   None
  */
 static void pmcraid_disable_interrupts(
     struct pmcraid_instance *pinstance,
     u32 intrs
 )
 {
     u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
     u32 nmask = gmask | GLOBAL_INTERRUPT_MASK;
 
     iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_clr_reg);
     iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
     ioread32(pinstance->int_regs.global_interrupt_mask_reg);
 
     if (!pinstance->interrupt_mode) {
         iowrite32(intrs,
             pinstance->int_regs.ioa_host_interrupt_mask_reg);
         ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
     }
 }
 
 /**
  * pmcraid_enable_interrupts - Enables specified interrupts
  *
  * @pinstance: pointer to per adapter instance structure
  * @intrs: interrupts to enable
  *
  * Return Value
  *   None
  */
 static void pmcraid_enable_interrupts(
     struct pmcraid_instance *pinstance,
     u32 intrs)
 {
     u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
     u32 nmask = gmask & (~GLOBAL_INTERRUPT_MASK);
 
     iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
 
     if (!pinstance->interrupt_mode) {
         iowrite32(~intrs,
              pinstance->int_regs.ioa_host_interrupt_mask_reg);
         ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
     }
 
     pmcraid_info("enabled interrupts global mask = %x intr_mask = %x\n",
         ioread32(pinstance->int_regs.global_interrupt_mask_reg),
         ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg));
 }
 
 /**
  * pmcraid_clr_trans_op - clear trans to op interrupt
  *
  * @pinstance: pointer to per adapter instance structure
  *
  * Return Value
  *   None
  */
 static void pmcraid_clr_trans_op(
     struct pmcraid_instance *pinstance
 )
 {
     unsigned long lock_flags;
 
     if (!pinstance->interrupt_mode) {
         iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
             pinstance->int_regs.ioa_host_interrupt_mask_reg);
         ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
         iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
             pinstance->int_regs.ioa_host_interrupt_clr_reg);
         ioread32(pinstance->int_regs.ioa_host_interrupt_clr_reg);
     }
 
     if (pinstance->reset_cmd != NULL) {
         del_timer(&pinstance->reset_cmd->timer);
         spin_lock_irqsave(
             pinstance->host->host_lock, lock_flags);
         pinstance->reset_cmd->cmd_done(pinstance->reset_cmd);
         spin_unlock_irqrestore(
             pinstance->host->host_lock, lock_flags);
     }
 }
 
 /**
  * pmcraid_reset_type - Determine the required reset type
  * @pinstance: pointer to adapter instance structure
  *
  * IOA requires hard reset if any of the following conditions is true.
  * 1. If HRRQ valid interrupt is not masked
  * 2. IOA reset alert doorbell is set
  * 3. If there are any error interrupts
  */
 static void pmcraid_reset_type(struct pmcraid_instance *pinstance)
 {
     u32 mask;
     u32 intrs;
     u32 alerts;
 
     mask = ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
     intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
     alerts = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
 
     if ((mask & INTRS_HRRQ_VALID) == 0 ||
         (alerts & DOORBELL_IOA_RESET_ALERT) ||
         (intrs & PMCRAID_ERROR_INTERRUPTS)) {
         pmcraid_info("IOA requires hard reset\n");
         pinstance->ioa_hard_reset = 1;
     }
 
     /* If unit check is active, trigger the dump */
     if (intrs & INTRS_IOA_UNIT_CHECK)
         pinstance->ioa_unit_check = 1;
 }
 
 static void pmcraid_ioa_reset(struct pmcraid_cmd *);
 /**
  * pmcraid_bist_done - completion function for PCI BIST
  * @t: pointer to reset command
  * Return Value
  *  none
  */
 static void pmcraid_bist_done(struct timer_list *t)
 {
     struct pmcraid_cmd *cmd = from_timer(cmd, t, timer);
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     unsigned long lock_flags;
     int rc;
     u16 pci_reg;
 
     rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
 
     /* If PCI config space can't be accessed wait for another two secs */
     if ((rc != PCIBIOS_SUCCESSFUL || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
         cmd->time_left > 0) {
         pmcraid_info("BIST not complete, waiting another 2 secs\n");
         cmd->timer.expires = jiffies + cmd->time_left;
         cmd->time_left = 0;
         add_timer(&cmd->timer);
     } else {
         cmd->time_left = 0;
         pmcraid_info("BIST is complete, proceeding with reset\n");
         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
         pmcraid_ioa_reset(cmd);
         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
     }
 }
 
 /**
  * pmcraid_start_bist - starts BIST
  * @cmd: pointer to reset cmd
  * Return Value
  *   none
  */
 static void pmcraid_start_bist(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     u32 doorbells, intrs;
 
     /* proceed with bist and wait for 2 seconds */
     iowrite32(DOORBELL_IOA_START_BIST,
         pinstance->int_regs.host_ioa_interrupt_reg);
     doorbells = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
     intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
     pmcraid_info("doorbells after start bist: %x intrs: %x\n",
               doorbells, intrs);
 
     cmd->time_left = msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
     cmd->timer.expires = jiffies + msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
     cmd->timer.function = pmcraid_bist_done;
     add_timer(&cmd->timer);
 }
 
 /**
  * pmcraid_reset_alert_done - completion routine for reset_alert
  * @t: pointer to command block used in reset sequence
  * Return value
  *  None
  */
 static void pmcraid_reset_alert_done(struct timer_list *t)
 {
     struct pmcraid_cmd *cmd = from_timer(cmd, t, timer);
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     u32 status = ioread32(pinstance->ioa_status);
     unsigned long lock_flags;
 
     /* if the critical operation in progress bit is set or the wait times
      * out, invoke reset engine to proceed with hard reset. If there is
      * some more time to wait, restart the timer
      */
     if (((status & INTRS_CRITICAL_OP_IN_PROGRESS) == 0) ||
         cmd->time_left <= 0) {
         pmcraid_info("critical op is reset proceeding with reset\n");
         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
         pmcraid_ioa_reset(cmd);
         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
     } else {
         pmcraid_info("critical op is not yet reset waiting again\n");
         /* restart timer if some more time is available to wait */
         cmd->time_left -= PMCRAID_CHECK_FOR_RESET_TIMEOUT;
         cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
         cmd->timer.function = pmcraid_reset_alert_done;
         add_timer(&cmd->timer);
     }
 }
 
 static void pmcraid_notify_ioastate(struct pmcraid_instance *, u32);
 /**
  * pmcraid_reset_alert - alerts IOA for a possible reset
  * @cmd: command block to be used for reset sequence.
  *
  * Return Value
  *  returns 0 if pci config-space is accessible and RESET_DOORBELL is
  *  successfully written to IOA. Returns non-zero in case pci_config_space
  *  is not accessible
  */
 static void pmcraid_reset_alert(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     u32 doorbells;
     int rc;
     u16 pci_reg;
 
     /* If we are able to access IOA PCI config space, alert IOA that we are
      * going to reset it soon. This enables IOA to preserv persistent error
      * data if any. In case memory space is not accessible, proceed with
      * BIST or slot_reset
      */
     rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
     if ((rc == PCIBIOS_SUCCESSFUL) && (pci_reg & PCI_COMMAND_MEMORY)) {
 
         /* wait for IOA permission i.e until CRITICAL_OPERATION bit is
          * reset IOA doesn't generate any interrupts when CRITICAL
          * OPERATION bit is reset. A timer is started to wait for this
          * bit to be reset.
          */
         cmd->time_left = PMCRAID_RESET_TIMEOUT;
         cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
         cmd->timer.function = pmcraid_reset_alert_done;
         add_timer(&cmd->timer);
 
         iowrite32(DOORBELL_IOA_RESET_ALERT,
             pinstance->int_regs.host_ioa_interrupt_reg);
         doorbells =
             ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
         pmcraid_info("doorbells after reset alert: %x\n", doorbells);
     } else {
         pmcraid_info("PCI config is not accessible starting BIST\n");
         pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
         pmcraid_start_bist(cmd);
     }
 }
 
 /**
  * pmcraid_timeout_handler -  Timeout handler for internally generated ops
  *
  * @t: pointer to command structure, that got timedout
  *
  * This function blocks host requests and initiates an adapter reset.
  *
  * Return value:
  *   None
  */
 static void pmcraid_timeout_handler(struct timer_list *t)
 {
     struct pmcraid_cmd *cmd = from_timer(cmd, t, timer);
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     unsigned long lock_flags;
 
     dev_info(&pinstance->pdev->dev,
         "Adapter being reset due to cmd(CDB[0] = %x) timeout\n",
         cmd->ioa_cb->ioarcb.cdb[0]);
 
     /* Command timeouts result in hard reset sequence. The command that got
      * timed out may be the one used as part of reset sequence. In this
      * case restart reset sequence using the same command block even if
      * reset is in progress. Otherwise fail this command and get a free
      * command block to restart the reset sequence.
      */
     spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
     if (!pinstance->ioa_reset_in_progress) {
         pinstance->ioa_reset_attempts = 0;
         cmd = pmcraid_get_free_cmd(pinstance);
 
         /* If we are out of command blocks, just return here itself.
          * Some other command's timeout handler can do the reset job
          */
         if (cmd == NULL) {
             spin_unlock_irqrestore(pinstance->host->host_lock,
                            lock_flags);
             pmcraid_err("no free cmnd block for timeout handler\n");
             return;
         }
 
         pinstance->reset_cmd = cmd;
         pinstance->ioa_reset_in_progress = 1;
     } else {
         pmcraid_info("reset is already in progress\n");
 
         if (pinstance->reset_cmd != cmd) {
             /* This command should have been given to IOA, this
              * command will be completed by fail_outstanding_cmds
              * anyway
              */
             pmcraid_err("cmd is pending but reset in progress\n");
         }
 
         /* If this command was being used as part of the reset
          * sequence, set cmd_done pointer to pmcraid_ioa_reset. This
          * causes fail_outstanding_commands not to return the command
          * block back to free pool
          */
         if (cmd == pinstance->reset_cmd)
             cmd->cmd_done = pmcraid_ioa_reset;
     }
 
     /* Notify apps of important IOA bringup/bringdown sequences */
     if (pinstance->scn.ioa_state != PMC_DEVICE_EVENT_RESET_START &&
         pinstance->scn.ioa_state != PMC_DEVICE_EVENT_SHUTDOWN_START)
         pmcraid_notify_ioastate(pinstance,
                     PMC_DEVICE_EVENT_RESET_START);
 
     pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
     scsi_block_requests(pinstance->host);
     pmcraid_reset_alert(cmd);
     spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
 }
 
 /**
  * pmcraid_internal_done - completion routine for internally generated cmds
  *
  * @cmd: command that got response from IOA
  *
  * Return Value:
  *   none
  */
 static void pmcraid_internal_done(struct pmcraid_cmd *cmd)
 {
     pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
              cmd->ioa_cb->ioarcb.cdb[0],
              le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
 
     /* Some of the internal commands are sent with callers blocking for the
      * response. Same will be indicated as part of cmd->completion_req
      * field. Response path needs to wake up any waiters waiting for cmd
      * completion if this flag is set.
      */
     if (cmd->completion_req) {
         cmd->completion_req = 0;
         complete(&cmd->wait_for_completion);
     }
 
     /* most of the internal commands are completed by caller itself, so
      * no need to return the command block back to free pool until we are
      * required to do so (e.g once done with initialization).
      */
     if (cmd->release) {
         cmd->release = 0;
         pmcraid_return_cmd(cmd);
     }
 }
 
 /**
  * pmcraid_reinit_cfgtable_done - done function for cfg table reinitialization
  *
  * @cmd: command that got response from IOA
  *
  * This routine is called after driver re-reads configuration table due to a
  * lost CCN. It returns the command block back to free pool and schedules
  * worker thread to add/delete devices into the system.
  *
  * Return Value:
  *   none
  */
 static void pmcraid_reinit_cfgtable_done(struct pmcraid_cmd *cmd)
 {
     pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
              cmd->ioa_cb->ioarcb.cdb[0],
              le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
 
     if (cmd->release) {
         cmd->release = 0;
         pmcraid_return_cmd(cmd);
     }
     pmcraid_info("scheduling worker for config table reinitialization\n");
     schedule_work(&cmd->drv_inst->worker_q);
 }
 
 /**
  * pmcraid_erp_done - Process completion of SCSI error response from device
  * @cmd: pmcraid_command
  *
  * This function copies the sense buffer into the scsi_cmd struct and completes
  * scsi_cmd by calling scsi_done function.
  *
  * Return value:
  *  none
  */
 static void pmcraid_erp_done(struct pmcraid_cmd *cmd)
 {
     struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
 
     if (PMCRAID_IOASC_SENSE_KEY(ioasc) > 0) {
         scsi_cmd->result |= (DID_ERROR << 16);
         scmd_printk(KERN_INFO, scsi_cmd,
                 "command CDB[0] = %x failed with IOASC: 0x%08X\n",
                 cmd->ioa_cb->ioarcb.cdb[0], ioasc);
     }
 
     if (cmd->sense_buffer) {
         dma_unmap_single(&pinstance->pdev->dev, cmd->sense_buffer_dma,
                  SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
         cmd->sense_buffer = NULL;
         cmd->sense_buffer_dma = 0;
     }
 
     scsi_dma_unmap(scsi_cmd);
     pmcraid_return_cmd(cmd);
     scsi_done(scsi_cmd);
 }
 
 /**
  * _pmcraid_fire_command - sends an IOA command to adapter
  *
  * This function adds the given block into pending command list
  * and returns without waiting
  *
  * @cmd : command to be sent to the device
  *
  * Return Value
  *  None
  */
 static void _pmcraid_fire_command(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     unsigned long lock_flags;
 
     /* Add this command block to pending cmd pool. We do this prior to
      * writting IOARCB to ioarrin because IOA might complete the command
      * by the time we are about to add it to the list. Response handler
      * (isr/tasklet) looks for cmd block in the pending pending list.
      */
     spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
     list_add_tail(&cmd->free_list, &pinstance->pending_cmd_pool);
     spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
     atomic_inc(&pinstance->outstanding_cmds);
 
     /* driver writes lower 32-bit value of IOARCB address only */
     mb();
     iowrite32(le64_to_cpu(cmd->ioa_cb->ioarcb.ioarcb_bus_addr), pinstance->ioarrin);
 }
 
 /**
  * pmcraid_send_cmd - fires a command to IOA
  *
  * This function also sets up timeout function, and command completion
  * function
  *
  * @cmd: pointer to the command block to be fired to IOA
  * @cmd_done: command completion function, called once IOA responds
  * @timeout: timeout to wait for this command completion
  * @timeout_func: timeout handler
  *
  * Return value
  *   none
  */
 static void pmcraid_send_cmd(
     struct pmcraid_cmd *cmd,
     void (*cmd_done) (struct pmcraid_cmd *),
     unsigned long timeout,
     void (*timeout_func) (struct timer_list *)
 )
 {
     /* initialize done function */
     cmd->cmd_done = cmd_done;
 
     if (timeout_func) {
         /* setup timeout handler */
         cmd->timer.expires = jiffies + timeout;
         cmd->timer.function = timeout_func;
         add_timer(&cmd->timer);
     }
 
     /* fire the command to IOA */
     _pmcraid_fire_command(cmd);
 }
 
 /**
  * pmcraid_ioa_shutdown_done - completion function for IOA shutdown command
  * @cmd: pointer to the command block used for sending IOA shutdown command
  *
  * Return value
  *  None
  */
 static void pmcraid_ioa_shutdown_done(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     unsigned long lock_flags;
 
     spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
     pmcraid_ioa_reset(cmd);
     spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
 }
 
 /**
  * pmcraid_ioa_shutdown - sends SHUTDOWN command to ioa
  *
  * @cmd: pointer to the command block used as part of reset sequence
  *
  * Return Value
  *  None
  */
 static void pmcraid_ioa_shutdown(struct pmcraid_cmd *cmd)
 {
     pmcraid_info("response for Cancel CCN CDB[0] = %x ioasc = %x\n",
              cmd->ioa_cb->ioarcb.cdb[0],
              le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
 
     /* Note that commands sent during reset require next command to be sent
      * to IOA. Hence reinit the done function as well as timeout function
      */
     pmcraid_reinit_cmdblk(cmd);
     cmd->ioa_cb->ioarcb.request_type = REQ_TYPE_IOACMD;
     cmd->ioa_cb->ioarcb.resource_handle =
         cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
     cmd->ioa_cb->ioarcb.cdb[0] = PMCRAID_IOA_SHUTDOWN;
     cmd->ioa_cb->ioarcb.cdb[1] = PMCRAID_SHUTDOWN_NORMAL;
 
     /* fire shutdown command to hardware. */
     pmcraid_info("firing normal shutdown command (%d) to IOA\n",
              le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle));
 
     pmcraid_notify_ioastate(cmd->drv_inst, PMC_DEVICE_EVENT_SHUTDOWN_START);
 
     pmcraid_send_cmd(cmd, pmcraid_ioa_shutdown_done,
              PMCRAID_SHUTDOWN_TIMEOUT,
              pmcraid_timeout_handler);
 }
 
 static void pmcraid_querycfg(struct pmcraid_cmd *);
 /**
  * pmcraid_get_fwversion_done - completion function for get_fwversion
  *
  * @cmd: pointer to command block used to send INQUIRY command
  *
  * Return Value
  *  none
  */
 static void pmcraid_get_fwversion_done(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
     unsigned long lock_flags;
 
     /* configuration table entry size depends on firmware version. If fw
      * version is not known, it is not possible to interpret IOA config
      * table
      */
     if (ioasc) {
         pmcraid_err("IOA Inquiry failed with %x\n", ioasc);
         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
         pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
         pmcraid_reset_alert(cmd);
         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
     } else  {
         pmcraid_querycfg(cmd);
     }
 }
 
 /**
  * pmcraid_get_fwversion - reads firmware version information
  *
  * @cmd: pointer to command block used to send INQUIRY command
  *
  * Return Value
  *  none
  */
 static void pmcraid_get_fwversion(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
     struct pmcraid_ioadl_desc *ioadl;
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     u16 data_size = sizeof(struct pmcraid_inquiry_data);
 
     pmcraid_reinit_cmdblk(cmd);
     ioarcb->request_type = REQ_TYPE_SCSI;
     ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
     ioarcb->cdb[0] = INQUIRY;
     ioarcb->cdb[1] = 1;
     ioarcb->cdb[2] = 0xD0;
     ioarcb->cdb[3] = (data_size >> 8) & 0xFF;
     ioarcb->cdb[4] = data_size & 0xFF;
 
     /* Since entire inquiry data it can be part of IOARCB itself
      */
     ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
                     offsetof(struct pmcraid_ioarcb,
                         add_data.u.ioadl[0]));
     ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
     ioarcb->ioarcb_bus_addr &= cpu_to_le64(~(0x1FULL));
 
     ioarcb->request_flags0 |= NO_LINK_DESCS;
     ioarcb->data_transfer_length = cpu_to_le32(data_size);
     ioadl = &(ioarcb->add_data.u.ioadl[0]);
     ioadl->flags = IOADL_FLAGS_LAST_DESC;
     ioadl->address = cpu_to_le64(pinstance->inq_data_baddr);
     ioadl->data_len = cpu_to_le32(data_size);
 
     pmcraid_send_cmd(cmd, pmcraid_get_fwversion_done,
              PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
 }
 
 /**
  * pmcraid_identify_hrrq - registers host rrq buffers with IOA
  * @cmd: pointer to command block to be used for identify hrrq
  *
  * Return Value
  *   none
  */
 static void pmcraid_identify_hrrq(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
     int index = cmd->hrrq_index;
     __be64 hrrq_addr = cpu_to_be64(pinstance->hrrq_start_bus_addr[index]);
     __be32 hrrq_size = cpu_to_be32(sizeof(u32) * PMCRAID_MAX_CMD);
     void (*done_function)(struct pmcraid_cmd *);
 
     pmcraid_reinit_cmdblk(cmd);
     cmd->hrrq_index = index + 1;
 
     if (cmd->hrrq_index < pinstance->num_hrrq) {
         done_function = pmcraid_identify_hrrq;
     } else {
         cmd->hrrq_index = 0;
         done_function = pmcraid_get_fwversion;
     }
 
     /* Initialize ioarcb */
     ioarcb->request_type = REQ_TYPE_IOACMD;
     ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
 
     /* initialize the hrrq number where IOA will respond to this command */
     ioarcb->hrrq_id = index;
     ioarcb->cdb[0] = PMCRAID_IDENTIFY_HRRQ;
     ioarcb->cdb[1] = index;
 
     /* IOA expects 64-bit pci address to be written in B.E format
      * (i.e cdb[2]=MSByte..cdb[9]=LSB.
      */
     pmcraid_info("HRRQ_IDENTIFY with hrrq:ioarcb:index => %llx:%llx:%x\n",
              hrrq_addr, ioarcb->ioarcb_bus_addr, index);
 
     memcpy(&(ioarcb->cdb[2]), &hrrq_addr, sizeof(hrrq_addr));
     memcpy(&(ioarcb->cdb[10]), &hrrq_size, sizeof(hrrq_size));
 
     /* Subsequent commands require HRRQ identification to be successful.
      * Note that this gets called even during reset from SCSI mid-layer
      * or tasklet
      */
     pmcraid_send_cmd(cmd, done_function,
              PMCRAID_INTERNAL_TIMEOUT,
              pmcraid_timeout_handler);
 }
 
 static void pmcraid_process_ccn(struct pmcraid_cmd *cmd);
 static void pmcraid_process_ldn(struct pmcraid_cmd *cmd);
 
 /**
  * pmcraid_send_hcam_cmd - send an initialized command block(HCAM) to IOA
  *
  * @cmd: initialized command block pointer
  *
  * Return Value
  *   none
  */
 static void pmcraid_send_hcam_cmd(struct pmcraid_cmd *cmd)
 {
     if (cmd->ioa_cb->ioarcb.cdb[1] == PMCRAID_HCAM_CODE_CONFIG_CHANGE)
         atomic_set(&(cmd->drv_inst->ccn.ignore), 0);
     else
         atomic_set(&(cmd->drv_inst->ldn.ignore), 0);
 
     pmcraid_send_cmd(cmd, cmd->cmd_done, 0, NULL);
 }
 
 /**
  * pmcraid_init_hcam - send an initialized command block(HCAM) to IOA
  *
  * @pinstance: pointer to adapter instance structure
  * @type: HCAM type
  *
  * Return Value
  *   pointer to initialized pmcraid_cmd structure or NULL
  */
 static struct pmcraid_cmd *pmcraid_init_hcam
 (
     struct pmcraid_instance *pinstance,
     u8 type
 )
 {
     struct pmcraid_cmd *cmd;
     struct pmcraid_ioarcb *ioarcb;
     struct pmcraid_ioadl_desc *ioadl;
     struct pmcraid_hostrcb *hcam;
     void (*cmd_done) (struct pmcraid_cmd *);
     dma_addr_t dma;
     int rcb_size;
 
     cmd = pmcraid_get_free_cmd(pinstance);
 
     if (!cmd) {
         pmcraid_err("no free command blocks for hcam\n");
         return cmd;
     }
 
     if (type == PMCRAID_HCAM_CODE_CONFIG_CHANGE) {
         rcb_size = sizeof(struct pmcraid_hcam_ccn_ext);
         cmd_done = pmcraid_process_ccn;
         dma = pinstance->ccn.baddr + PMCRAID_AEN_HDR_SIZE;
         hcam = &pinstance->ccn;
     } else {
         rcb_size = sizeof(struct pmcraid_hcam_ldn);
         cmd_done = pmcraid_process_ldn;
         dma = pinstance->ldn.baddr + PMCRAID_AEN_HDR_SIZE;
         hcam = &pinstance->ldn;
     }
 
     /* initialize command pointer used for HCAM registration */
     hcam->cmd = cmd;
 
     ioarcb = &cmd->ioa_cb->ioarcb;
     ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
                     offsetof(struct pmcraid_ioarcb,
                         add_data.u.ioadl[0]));
     ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
     ioadl = ioarcb->add_data.u.ioadl;
 
     /* Initialize ioarcb */
     ioarcb->request_type = REQ_TYPE_HCAM;
     ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
     ioarcb->cdb[0] = PMCRAID_HOST_CONTROLLED_ASYNC;
     ioarcb->cdb[1] = type;
     ioarcb->cdb[7] = (rcb_size >> 8) & 0xFF;
     ioarcb->cdb[8] = (rcb_size) & 0xFF;
 
     ioarcb->data_transfer_length = cpu_to_le32(rcb_size);
 
     ioadl[0].flags |= IOADL_FLAGS_READ_LAST;
     ioadl[0].data_len = cpu_to_le32(rcb_size);
     ioadl[0].address = cpu_to_le64(dma);
 
     cmd->cmd_done = cmd_done;
     return cmd;
 }
 
 /**
  * pmcraid_send_hcam - Send an HCAM to IOA
  * @pinstance: ioa config struct
  * @type: HCAM type
  *
  * This function will send a Host Controlled Async command to IOA.
  *
  * Return value:
  *  none
  */
 static void pmcraid_send_hcam(struct pmcraid_instance *pinstance, u8 type)
 {
     struct pmcraid_cmd *cmd = pmcraid_init_hcam(pinstance, type);
     pmcraid_send_hcam_cmd(cmd);
 }
 
 
 /**
  * pmcraid_prepare_cancel_cmd - prepares a command block to abort another
  *
  * @cmd: pointer to cmd that is used as cancelling command
  * @cmd_to_cancel: pointer to the command that needs to be cancelled
  */
 static void pmcraid_prepare_cancel_cmd(
     struct pmcraid_cmd *cmd,
     struct pmcraid_cmd *cmd_to_cancel
 )
 {
     struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
     __be64 ioarcb_addr;
 
     /* IOARCB address of the command to be cancelled is given in
      * cdb[2]..cdb[9] is Big-Endian format. Note that length bits in
      * IOARCB address are not masked.
      */
     ioarcb_addr = cpu_to_be64(le64_to_cpu(cmd_to_cancel->ioa_cb->ioarcb.ioarcb_bus_addr));
 
     /* Get the resource handle to where the command to be aborted has been
      * sent.
      */
     ioarcb->resource_handle = cmd_to_cancel->ioa_cb->ioarcb.resource_handle;
     ioarcb->request_type = REQ_TYPE_IOACMD;
     memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
     ioarcb->cdb[0] = PMCRAID_ABORT_CMD;
 
     memcpy(&(ioarcb->cdb[2]), &ioarcb_addr, sizeof(ioarcb_addr));
 }
 
 /**
  * pmcraid_cancel_hcam - sends ABORT task to abort a given HCAM
  *
  * @cmd: command to be used as cancelling command
  * @type: HCAM type
  * @cmd_done: op done function for the cancelling command
  */
 static void pmcraid_cancel_hcam(
     struct pmcraid_cmd *cmd,
     u8 type,
     void (*cmd_done) (struct pmcraid_cmd *)
 )
 {
     struct pmcraid_instance *pinstance;
     struct pmcraid_hostrcb  *hcam;
 
     pinstance = cmd->drv_inst;
     hcam =  (type == PMCRAID_HCAM_CODE_LOG_DATA) ?
         &pinstance->ldn : &pinstance->ccn;
 
     /* prepare for cancelling previous hcam command. If the HCAM is
      * currently not pending with IOA, we would have hcam->cmd as non-null
      */
     if (hcam->cmd == NULL)
         return;
 
     pmcraid_prepare_cancel_cmd(cmd, hcam->cmd);
 
     /* writing to IOARRIN must be protected by host_lock, as mid-layer
      * schedule queuecommand while we are doing this
      */
     pmcraid_send_cmd(cmd, cmd_done,
              PMCRAID_INTERNAL_TIMEOUT,
              pmcraid_timeout_handler);
 }
 
 /**
  * pmcraid_cancel_ccn - cancel CCN HCAM already registered with IOA
  *
  * @cmd: command block to be used for cancelling the HCAM
  */
 static void pmcraid_cancel_ccn(struct pmcraid_cmd *cmd)
 {
     pmcraid_info("response for Cancel LDN CDB[0] = %x ioasc = %x\n",
              cmd->ioa_cb->ioarcb.cdb[0],
              le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
 
     pmcraid_reinit_cmdblk(cmd);
 
     pmcraid_cancel_hcam(cmd,
                 PMCRAID_HCAM_CODE_CONFIG_CHANGE,
                 pmcraid_ioa_shutdown);
 }
 
 /**
  * pmcraid_cancel_ldn - cancel LDN HCAM already registered with IOA
  *
  * @cmd: command block to be used for cancelling the HCAM
  */
 static void pmcraid_cancel_ldn(struct pmcraid_cmd *cmd)
 {
     pmcraid_cancel_hcam(cmd,
                 PMCRAID_HCAM_CODE_LOG_DATA,
                 pmcraid_cancel_ccn);
 }
 
 /**
  * pmcraid_expose_resource - check if the resource can be exposed to OS
  *
  * @fw_version: firmware version code
  * @cfgte: pointer to configuration table entry of the resource
  *
  * Return value:
  *  true if resource can be added to midlayer, false(0) otherwise
  */
 static int pmcraid_expose_resource(u16 fw_version,
                    struct pmcraid_config_table_entry *cfgte)
 {
     int retval = 0;
 
     if (cfgte->resource_type == RES_TYPE_VSET) {
         if (fw_version <= PMCRAID_FW_VERSION_1)
             retval = ((cfgte->unique_flags1 & 0x80) == 0);
         else
             retval = ((cfgte->unique_flags0 & 0x80) == 0 &&
                   (cfgte->unique_flags1 & 0x80) == 0);
 
     } else if (cfgte->resource_type == RES_TYPE_GSCSI)
         retval = (RES_BUS(cfgte->resource_address) !=
                 PMCRAID_VIRTUAL_ENCL_BUS_ID);
     return retval;
 }
 
 /* attributes supported by pmcraid_event_family */
 enum {
     PMCRAID_AEN_ATTR_UNSPEC,
     PMCRAID_AEN_ATTR_EVENT,
     __PMCRAID_AEN_ATTR_MAX,
 };
 #define PMCRAID_AEN_ATTR_MAX (__PMCRAID_AEN_ATTR_MAX - 1)
 
 /* commands supported by pmcraid_event_family */
 enum {
     PMCRAID_AEN_CMD_UNSPEC,
     PMCRAID_AEN_CMD_EVENT,
     __PMCRAID_AEN_CMD_MAX,
 };
 #define PMCRAID_AEN_CMD_MAX (__PMCRAID_AEN_CMD_MAX - 1)
 
 static struct genl_multicast_group pmcraid_mcgrps[] = {
     { .name = "events", /* not really used - see ID discussion below */ },
 };
 
 static struct genl_family pmcraid_event_family __ro_after_init = {
     .module = THIS_MODULE,
     .name = "pmcraid",
     .version = 1,
     .maxattr = PMCRAID_AEN_ATTR_MAX,
     .mcgrps = pmcraid_mcgrps,
     .n_mcgrps = ARRAY_SIZE(pmcraid_mcgrps),
 };
 
 /**
  * pmcraid_netlink_init - registers pmcraid_event_family
  *
  * Return value:
  *  0 if the pmcraid_event_family is successfully registered
  *  with netlink generic, non-zero otherwise
  */
 static int __init pmcraid_netlink_init(void)
 {
     int result;
 
     result = genl_register_family(&pmcraid_event_family);
 
     if (result)
         return result;
 
     pmcraid_info("registered NETLINK GENERIC group: %d\n",
              pmcraid_event_family.id);
 
     return result;
 }
 
 /**
  * pmcraid_netlink_release - unregisters pmcraid_event_family
  *
  * Return value:
  *  none
  */
 static void pmcraid_netlink_release(void)
 {
     genl_unregister_family(&pmcraid_event_family);
 }
 
 /*
  * pmcraid_notify_aen - sends event msg to user space application
  * @pinstance: pointer to adapter instance structure
  *
  * Return value:
  *  0 if success, error value in case of any failure.
  */
 static int pmcraid_notify_aen(
     struct pmcraid_instance *pinstance,
     struct pmcraid_aen_msg  *aen_msg,
     u32    data_size)
 {
     struct sk_buff *skb;
     void *msg_header;
     u32  total_size, nla_genl_hdr_total_size;
     int result;
 
     aen_msg->hostno = (pinstance->host->unique_id << 16 |
                MINOR(pinstance->cdev.dev));
     aen_msg->length = data_size;
 
     data_size += sizeof(*aen_msg);
 
     total_size = nla_total_size(data_size);
     /* Add GENL_HDR to total_size */
     nla_genl_hdr_total_size =
         (total_size + (GENL_HDRLEN +
         ((struct genl_family *)&pmcraid_event_family)->hdrsize)
          + NLMSG_HDRLEN);
     skb = genlmsg_new(nla_genl_hdr_total_size, GFP_ATOMIC);
 
 
     if (!skb) {
         pmcraid_err("Failed to allocate aen data SKB of size: %x\n",
                  total_size);
         return -ENOMEM;
     }
 
     /* add the genetlink message header */
     msg_header = genlmsg_put(skb, 0, 0,
                  &pmcraid_event_family, 0,
                  PMCRAID_AEN_CMD_EVENT);
     if (!msg_header) {
         pmcraid_err("failed to copy command details\n");
         nlmsg_free(skb);
         return -ENOMEM;
     }
 
     result = nla_put(skb, PMCRAID_AEN_ATTR_EVENT, data_size, aen_msg);
 
     if (result) {
         pmcraid_err("failed to copy AEN attribute data\n");
         nlmsg_free(skb);
         return -EINVAL;
     }
 
     /* send genetlink multicast message to notify applications */
     genlmsg_end(skb, msg_header);
 
     result = genlmsg_multicast(&pmcraid_event_family, skb,
                    0, 0, GFP_ATOMIC);
 
     /* If there are no listeners, genlmsg_multicast may return non-zero
      * value.
      */
     if (result)
         pmcraid_info("error (%x) sending aen event message\n", result);
     return result;
 }
 
 /**
  * pmcraid_notify_ccn - notifies about CCN event msg to user space
  * @pinstance: pointer adapter instance structure
  *
  * Return value:
  *  0 if success, error value in case of any failure
  */
 static int pmcraid_notify_ccn(struct pmcraid_instance *pinstance)
 {
     return pmcraid_notify_aen(pinstance,
                 pinstance->ccn.msg,
                 le32_to_cpu(pinstance->ccn.hcam->data_len) +
                 sizeof(struct pmcraid_hcam_hdr));
 }
 
 /**
  * pmcraid_notify_ldn - notifies about CCN event msg to user space
  * @pinstance: pointer adapter instance structure
  *
  * Return value:
  *  0 if success, error value in case of any failure
  */
 static int pmcraid_notify_ldn(struct pmcraid_instance *pinstance)
 {
     return pmcraid_notify_aen(pinstance,
                 pinstance->ldn.msg,
                 le32_to_cpu(pinstance->ldn.hcam->data_len) +
                 sizeof(struct pmcraid_hcam_hdr));
 }
 
 /**
  * pmcraid_notify_ioastate - sends IOA state event msg to user space
  * @pinstance: pointer adapter instance structure
  * @evt: controller state event to be sent
  *
  * Return value:
  *  0 if success, error value in case of any failure
  */
 static void pmcraid_notify_ioastate(struct pmcraid_instance *pinstance, u32 evt)
 {
     pinstance->scn.ioa_state = evt;
     pmcraid_notify_aen(pinstance,
               &pinstance->scn.msg,
               sizeof(u32));
 }
 
 /**
  * pmcraid_handle_config_change - Handle a config change from the adapter
  * @pinstance: pointer to per adapter instance structure
  *
  * Return value:
  *  none
  */
 
 static void pmcraid_handle_config_change(struct pmcraid_instance *pinstance)
 {
     struct pmcraid_config_table_entry *cfg_entry;
     struct pmcraid_hcam_ccn *ccn_hcam;
     struct pmcraid_cmd *cmd;
     struct pmcraid_cmd *cfgcmd;
     struct pmcraid_resource_entry *res = NULL;
     unsigned long lock_flags;
     unsigned long host_lock_flags;
     u32 new_entry = 1;
     u32 hidden_entry = 0;
     u16 fw_version;
     int rc;
 
     ccn_hcam = (struct pmcraid_hcam_ccn *)pinstance->ccn.hcam;
     cfg_entry = &ccn_hcam->cfg_entry;
     fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
 
     pmcraid_info("CCN(%x): %x timestamp: %llx type: %x lost: %x flags: %x \
          res: %x:%x:%x:%x\n",
          le32_to_cpu(pinstance->ccn.hcam->ilid),
          pinstance->ccn.hcam->op_code,
         (le32_to_cpu(pinstance->ccn.hcam->timestamp1) |
         ((le32_to_cpu(pinstance->ccn.hcam->timestamp2) & 0xffffffffLL) << 32)),
          pinstance->ccn.hcam->notification_type,
          pinstance->ccn.hcam->notification_lost,
          pinstance->ccn.hcam->flags,
          pinstance->host->unique_id,
          RES_IS_VSET(*cfg_entry) ? PMCRAID_VSET_BUS_ID :
          (RES_IS_GSCSI(*cfg_entry) ? PMCRAID_PHYS_BUS_ID :
             RES_BUS(cfg_entry->resource_address)),
          RES_IS_VSET(*cfg_entry) ?
             (fw_version <= PMCRAID_FW_VERSION_1 ?
                 cfg_entry->unique_flags1 :
                 le16_to_cpu(cfg_entry->array_id) & 0xFF) :
             RES_TARGET(cfg_entry->resource_address),
          RES_LUN(cfg_entry->resource_address));
 
 
     /* If this HCAM indicates a lost notification, read the config table */
     if (pinstance->ccn.hcam->notification_lost) {
         cfgcmd = pmcraid_get_free_cmd(pinstance);
         if (cfgcmd) {
             pmcraid_info("lost CCN, reading config table\b");
             pinstance->reinit_cfg_table = 1;
             pmcraid_querycfg(cfgcmd);
         } else {
             pmcraid_err("lost CCN, no free cmd for querycfg\n");
         }
         goto out_notify_apps;
     }
 
     /* If this resource is not going to be added to mid-layer, just notify
      * applications and return. If this notification is about hiding a VSET
      * resource, check if it was exposed already.
      */
     if (pinstance->ccn.hcam->notification_type ==
         NOTIFICATION_TYPE_ENTRY_CHANGED &&
         cfg_entry->resource_type == RES_TYPE_VSET) {
         hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
     } else if (!pmcraid_expose_resource(fw_version, cfg_entry)) {
         goto out_notify_apps;
     }
 
     spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
     list_for_each_entry(res, &pinstance->used_res_q, queue) {
         rc = memcmp(&res->cfg_entry.resource_address,
                 &cfg_entry->resource_address,
                 sizeof(cfg_entry->resource_address));
         if (!rc) {
             new_entry = 0;
             break;
         }
     }
 
     if (new_entry) {
 
         if (hidden_entry) {
             spin_unlock_irqrestore(&pinstance->resource_lock,
                         lock_flags);
             goto out_notify_apps;
         }
 
         /* If there are more number of resources than what driver can
          * manage, do not notify the applications about the CCN. Just
          * ignore this notifications and re-register the same HCAM
          */
         if (list_empty(&pinstance->free_res_q)) {
             spin_unlock_irqrestore(&pinstance->resource_lock,
                         lock_flags);
             pmcraid_err("too many resources attached\n");
             spin_lock_irqsave(pinstance->host->host_lock,
                       host_lock_flags);
             pmcraid_send_hcam(pinstance,
                       PMCRAID_HCAM_CODE_CONFIG_CHANGE);
             spin_unlock_irqrestore(pinstance->host->host_lock,
                            host_lock_flags);
             return;
         }
 
         res = list_entry(pinstance->free_res_q.next,
                  struct pmcraid_resource_entry, queue);
 
         list_del(&res->queue);
         res->scsi_dev = NULL;
         res->reset_progress = 0;
         list_add_tail(&res->queue, &pinstance->used_res_q);
     }
 
     memcpy(&res->cfg_entry, cfg_entry, pinstance->config_table_entry_size);
 
     if (pinstance->ccn.hcam->notification_type ==
         NOTIFICATION_TYPE_ENTRY_DELETED || hidden_entry) {
         if (res->scsi_dev) {
             if (fw_version <= PMCRAID_FW_VERSION_1)
                 res->cfg_entry.unique_flags1 &= 0x7F;
             else
                 res->cfg_entry.array_id &= cpu_to_le16(0xFF);
             res->change_detected = RES_CHANGE_DEL;
             res->cfg_entry.resource_handle =
                 PMCRAID_INVALID_RES_HANDLE;
             schedule_work(&pinstance->worker_q);
         } else {
             /* This may be one of the non-exposed resources */
             list_move_tail(&res->queue, &pinstance->free_res_q);
         }
     } else if (!res->scsi_dev) {
         res->change_detected = RES_CHANGE_ADD;
         schedule_work(&pinstance->worker_q);
     }
     spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
 
 out_notify_apps:
 
     /* Notify configuration changes to registered applications.*/
     if (!pmcraid_disable_aen)
         pmcraid_notify_ccn(pinstance);
 
     cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
     if (cmd)
         pmcraid_send_hcam_cmd(cmd);
 }
 
 /**
  * pmcraid_get_error_info - return error string for an ioasc
  * @ioasc: ioasc code
  * Return Value
  *   none
  */
 static struct pmcraid_ioasc_error *pmcraid_get_error_info(u32 ioasc)
 {
     int i;
     for (i = 0; i < ARRAY_SIZE(pmcraid_ioasc_error_table); i++) {
         if (pmcraid_ioasc_error_table[i].ioasc_code == ioasc)
             return &pmcraid_ioasc_error_table[i];
     }
     return NULL;
 }
 
 /**
  * pmcraid_ioasc_logger - log IOASC information based user-settings
  * @ioasc: ioasc code
  * @cmd: pointer to command that resulted in 'ioasc'
  */
 static void pmcraid_ioasc_logger(u32 ioasc, struct pmcraid_cmd *cmd)
 {
     struct pmcraid_ioasc_error *error_info = pmcraid_get_error_info(ioasc);
 
     if (error_info == NULL ||
         cmd->drv_inst->current_log_level < error_info->log_level)
         return;
 
     /* log the error string */
     pmcraid_err("cmd [%x] for resource %x failed with %x(%s)\n",
         cmd->ioa_cb->ioarcb.cdb[0],
         le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
         ioasc, error_info->error_string);
 }
 
 /**
  * pmcraid_handle_error_log - Handle a config change (error log) from the IOA
  *
  * @pinstance: pointer to per adapter instance structure
  *
  * Return value:
  *  none
  */
 static void pmcraid_handle_error_log(struct pmcraid_instance *pinstance)
 {
     struct pmcraid_hcam_ldn *hcam_ldn;
     u32 ioasc;
 
     hcam_ldn = (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
 
     pmcraid_info
         ("LDN(%x): %x type: %x lost: %x flags: %x overlay id: %x\n",
          pinstance->ldn.hcam->ilid,
          pinstance->ldn.hcam->op_code,
          pinstance->ldn.hcam->notification_type,
          pinstance->ldn.hcam->notification_lost,
          pinstance->ldn.hcam->flags,
          pinstance->ldn.hcam->overlay_id);
 
     /* log only the errors, no need to log informational log entries */
     if (pinstance->ldn.hcam->notification_type !=
         NOTIFICATION_TYPE_ERROR_LOG)
         return;
 
     if (pinstance->ldn.hcam->notification_lost ==
         HOSTRCB_NOTIFICATIONS_LOST)
         dev_info(&pinstance->pdev->dev, "Error notifications lost\n");
 
     ioasc = le32_to_cpu(hcam_ldn->error_log.fd_ioasc);
 
     if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
         ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER) {
         dev_info(&pinstance->pdev->dev,
             "UnitAttention due to IOA Bus Reset\n");
         scsi_report_bus_reset(
             pinstance->host,
             RES_BUS(hcam_ldn->error_log.fd_ra));
     }
 
     return;
 }
 
 /**
  * pmcraid_process_ccn - Op done function for a CCN.
  * @cmd: pointer to command struct
  *
  * This function is the op done function for a configuration
  * change notification
  *
  * Return value:
  * none
  */
 static void pmcraid_process_ccn(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
     unsigned long lock_flags;
 
     pinstance->ccn.cmd = NULL;
     pmcraid_return_cmd(cmd);
 
     /* If driver initiated IOA reset happened while this hcam was pending
      * with IOA, or IOA bringdown sequence is in progress, no need to
      * re-register the hcam
      */
     if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
         atomic_read(&pinstance->ccn.ignore) == 1) {
         return;
     } else if (ioasc) {
         dev_info(&pinstance->pdev->dev,
             "Host RCB (CCN) failed with IOASC: 0x%08X\n", ioasc);
         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
         pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
     } else {
         pmcraid_handle_config_change(pinstance);
     }
 }
 
 static void pmcraid_initiate_reset(struct pmcraid_instance *);
 static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd);
 /**
  * pmcraid_process_ldn - op done function for an LDN
  * @cmd: pointer to command block
  *
  * Return value
  *   none
  */
 static void pmcraid_process_ldn(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     struct pmcraid_hcam_ldn *ldn_hcam =
             (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
     u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
     u32 fd_ioasc = le32_to_cpu(ldn_hcam->error_log.fd_ioasc);
     unsigned long lock_flags;
 
     /* return the command block back to freepool */
     pinstance->ldn.cmd = NULL;
     pmcraid_return_cmd(cmd);
 
     /* If driver initiated IOA reset happened while this hcam was pending
      * with IOA, no need to re-register the hcam as reset engine will do it
      * once reset sequence is complete
      */
     if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
         atomic_read(&pinstance->ccn.ignore) == 1) {
         return;
     } else if (!ioasc) {
         pmcraid_handle_error_log(pinstance);
         if (fd_ioasc == PMCRAID_IOASC_NR_IOA_RESET_REQUIRED) {
             spin_lock_irqsave(pinstance->host->host_lock,
                       lock_flags);
             pmcraid_initiate_reset(pinstance);
             spin_unlock_irqrestore(pinstance->host->host_lock,
                            lock_flags);
             return;
         }
         if (fd_ioasc == PMCRAID_IOASC_TIME_STAMP_OUT_OF_SYNC) {
             pinstance->timestamp_error = 1;
             pmcraid_set_timestamp(cmd);
         }
     } else {
         dev_info(&pinstance->pdev->dev,
             "Host RCB(LDN) failed with IOASC: 0x%08X\n", ioasc);
     }
     /* send netlink message for HCAM notification if enabled */
     if (!pmcraid_disable_aen)
         pmcraid_notify_ldn(pinstance);
 
     cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
     if (cmd)
         pmcraid_send_hcam_cmd(cmd);
 }
 
 /**
  * pmcraid_register_hcams - register HCAMs for CCN and LDN
  *
  * @pinstance: pointer per adapter instance structure
  *
  * Return Value
  *   none
  */
 static void pmcraid_register_hcams(struct pmcraid_instance *pinstance)
 {
     pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
     pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
 }
 
 /**
  * pmcraid_unregister_hcams - cancel HCAMs registered already
  * @cmd: pointer to command used as part of reset sequence
  */
 static void pmcraid_unregister_hcams(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_instance *pinstance = cmd->drv_inst;
 
     /* During IOA bringdown, HCAM gets fired and tasklet proceeds with
      * handling hcam response though it is not necessary. In order to
      * prevent this, set 'ignore', so that bring-down sequence doesn't
      * re-send any more hcams
      */
     atomic_set(&pinstance->ccn.ignore, 1);
     atomic_set(&pinstance->ldn.ignore, 1);
 
     /* If adapter reset was forced as part of runtime reset sequence,
      * start the reset sequence. Reset will be triggered even in case
      * IOA unit_check.
      */
     if ((pinstance->force_ioa_reset && !pinstance->ioa_bringdown) ||
          pinstance->ioa_unit_check) {
         pinstance->force_ioa_reset = 0;
         pinstance->ioa_unit_check = 0;
         pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
         pmcraid_reset_alert(cmd);
         return;
     }
 
     /* Driver tries to cancel HCAMs by sending ABORT TASK for each HCAM
      * one after the other. So CCN cancellation will be triggered by
      * pmcraid_cancel_ldn itself.
      */
     pmcraid_cancel_ldn(cmd);
 }
 
 static void pmcraid_reinit_buffers(struct pmcraid_instance *);
 
 /**
  * pmcraid_reset_enable_ioa - re-enable IOA after a hard reset
  * @pinstance: pointer to adapter instance structure
  * Return Value
  *  1 if TRANSITION_TO_OPERATIONAL is active, otherwise 0
  */
 static int pmcraid_reset_enable_ioa(struct pmcraid_instance *pinstance)
 {
     u32 intrs;
 
     pmcraid_reinit_buffers(pinstance);
     intrs = pmcraid_read_interrupts(pinstance);
 
     pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
 
     if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
         if (!pinstance->interrupt_mode) {
             iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
                 pinstance->int_regs.
                 ioa_host_interrupt_mask_reg);
             iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
         }
         return 1;
     } else {
         return 0;
     }
 }
 
 /**
  * pmcraid_soft_reset - performs a soft reset and makes IOA become ready
  * @cmd : pointer to reset command block
  *
  * Return Value
  *  none
  */
 static void pmcraid_soft_reset(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     u32 int_reg;
     u32 doorbell;
 
     /* There will be an interrupt when Transition to Operational bit is
      * set so tasklet would execute next reset task. The timeout handler
      * would re-initiate a reset
      */
     cmd->cmd_done = pmcraid_ioa_reset;
     cmd->timer.expires = jiffies +
                  msecs_to_jiffies(PMCRAID_TRANSOP_TIMEOUT);
     cmd->timer.function = pmcraid_timeout_handler;
 
     if (!timer_pending(&cmd->timer))
         add_timer(&cmd->timer);
 
     /* Enable destructive diagnostics on IOA if it is not yet in
      * operational state
      */
     doorbell = DOORBELL_RUNTIME_RESET |
            DOORBELL_ENABLE_DESTRUCTIVE_DIAGS;
 
     /* Since we do RESET_ALERT and Start BIST we have to again write
      * MSIX Doorbell to indicate the interrupt mode
      */
     if (pinstance->interrupt_mode) {
         iowrite32(DOORBELL_INTR_MODE_MSIX,
               pinstance->int_regs.host_ioa_interrupt_reg);
         ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
     }
 
     iowrite32(doorbell, pinstance->int_regs.host_ioa_interrupt_reg);
     ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
     int_reg = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
 
     pmcraid_info("Waiting for IOA to become operational %x:%x\n",
              ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
              int_reg);
 }
 
 /**
  * pmcraid_get_dump - retrieves IOA dump in case of Unit Check interrupt
  *
  * @pinstance: pointer to adapter instance structure
  *
  * Return Value
  *  none
  */
 static void pmcraid_get_dump(struct pmcraid_instance *pinstance)
 {
     pmcraid_info("%s is not yet implemented\n", __func__);
 }
 
 /**
  * pmcraid_fail_outstanding_cmds - Fails all outstanding ops.
  * @pinstance: pointer to adapter instance structure
  *
  * This function fails all outstanding ops. If they are submitted to IOA
  * already, it sends cancel all messages if IOA is still accepting IOARCBs,
  * otherwise just completes the commands and returns the cmd blocks to free
  * pool.
  *
  * Return value:
  *   none
  */
 static void pmcraid_fail_outstanding_cmds(struct pmcraid_instance *pinstance)
 {
     struct pmcraid_cmd *cmd, *temp;
     unsigned long lock_flags;
 
     /* pending command list is protected by pending_pool_lock. Its
      * traversal must be done as within this lock
      */
     spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
     list_for_each_entry_safe(cmd, temp, &pinstance->pending_cmd_pool,
                  free_list) {
         list_del(&cmd->free_list);
         spin_unlock_irqrestore(&pinstance->pending_pool_lock,
                     lock_flags);
         cmd->ioa_cb->ioasa.ioasc =
             cpu_to_le32(PMCRAID_IOASC_IOA_WAS_RESET);
         cmd->ioa_cb->ioasa.ilid =
             cpu_to_le32(PMCRAID_DRIVER_ILID);
 
         /* In case the command timer is still running */
         del_timer(&cmd->timer);
 
         /* If this is an IO command, complete it by invoking scsi_done
          * function. If this is one of the internal commands other
          * than pmcraid_ioa_reset and HCAM commands invoke cmd_done to
          * complete it
          */
         if (cmd->scsi_cmd) {
 
             struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
             __le32 resp = cmd->ioa_cb->ioarcb.response_handle;
 
             scsi_cmd->result |= DID_ERROR << 16;
 
             scsi_dma_unmap(scsi_cmd);
             pmcraid_return_cmd(cmd);
 
             pmcraid_info("failing(%d) CDB[0] = %x result: %x\n",
                      le32_to_cpu(resp) >> 2,
                      cmd->ioa_cb->ioarcb.cdb[0],
                      scsi_cmd->result);
             scsi_done(scsi_cmd);
         } else if (cmd->cmd_done == pmcraid_internal_done ||
                cmd->cmd_done == pmcraid_erp_done) {
             cmd->cmd_done(cmd);
         } else if (cmd->cmd_done != pmcraid_ioa_reset &&
                cmd->cmd_done != pmcraid_ioa_shutdown_done) {
             pmcraid_return_cmd(cmd);
         }
 
         atomic_dec(&pinstance->outstanding_cmds);
         spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
     }
 
     spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
 }
 
 /**
  * pmcraid_ioa_reset - Implementation of IOA reset logic
  *
  * @cmd: pointer to the cmd block to be used for entire reset process
  *
  * This function executes most of the steps required for IOA reset. This gets
  * called by user threads (modprobe/insmod/rmmod) timer, tasklet and midlayer's
  * 'eh_' thread. Access to variables used for controlling the reset sequence is
  * synchronized using host lock. Various functions called during reset process
  * would make use of a single command block, pointer to which is also stored in
  * adapter instance structure.
  *
  * Return Value
  *   None
  */
 static void pmcraid_ioa_reset(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     u8 reset_complete = 0;
 
     pinstance->ioa_reset_in_progress = 1;
 
     if (pinstance->reset_cmd != cmd) {
         pmcraid_err("reset is called with different command block\n");
         pinstance->reset_cmd = cmd;
     }
 
     pmcraid_info("reset_engine: state = %d, command = %p\n",
               pinstance->ioa_state, cmd);
 
     switch (pinstance->ioa_state) {
 
     case IOA_STATE_DEAD:
         /* If IOA is offline, whatever may be the reset reason, just
          * return. callers might be waiting on the reset wait_q, wake
          * up them
          */
         pmcraid_err("IOA is offline no reset is possible\n");
         reset_complete = 1;
         break;
 
     case IOA_STATE_IN_BRINGDOWN:
         /* we enter here, once ioa shutdown command is processed by IOA
          * Alert IOA for a possible reset. If reset alert fails, IOA
          * goes through hard-reset
          */
         pmcraid_disable_interrupts(pinstance, ~0);
         pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
         pmcraid_reset_alert(cmd);
         break;
 
     case IOA_STATE_UNKNOWN:
         /* We may be called during probe or resume. Some pre-processing
          * is required for prior to reset
          */
         scsi_block_requests(pinstance->host);
 
         /* If asked to reset while IOA was processing responses or
          * there are any error responses then IOA may require
          * hard-reset.
          */
         if (pinstance->ioa_hard_reset == 0) {
             if (ioread32(pinstance->ioa_status) &
                 INTRS_TRANSITION_TO_OPERATIONAL) {
                 pmcraid_info("sticky bit set, bring-up\n");
                 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
                 pmcraid_reinit_cmdblk(cmd);
                 pmcraid_identify_hrrq(cmd);
             } else {
                 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
                 pmcraid_soft_reset(cmd);
             }
         } else {
             /* Alert IOA of a possible reset and wait for critical
              * operation in progress bit to reset
              */
             pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
             pmcraid_reset_alert(cmd);
         }
         break;
 
     case IOA_STATE_IN_RESET_ALERT:
         /* If critical operation in progress bit is reset or wait gets
          * timed out, reset proceeds with starting BIST on the IOA.
          * pmcraid_ioa_hard_reset keeps a count of reset attempts. If
          * they are 3 or more, reset engine marks IOA dead and returns
          */
         pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
         pmcraid_start_bist(cmd);
         break;
 
     case IOA_STATE_IN_HARD_RESET:
         pinstance->ioa_reset_attempts++;
 
         /* retry reset if we haven't reached maximum allowed limit */
         if (pinstance->ioa_reset_attempts > PMCRAID_RESET_ATTEMPTS) {
             pinstance->ioa_reset_attempts = 0;
             pmcraid_err("IOA didn't respond marking it as dead\n");
             pinstance->ioa_state = IOA_STATE_DEAD;
 
             if (pinstance->ioa_bringdown)
                 pmcraid_notify_ioastate(pinstance,
                     PMC_DEVICE_EVENT_SHUTDOWN_FAILED);
             else
                 pmcraid_notify_ioastate(pinstance,
                         PMC_DEVICE_EVENT_RESET_FAILED);
             reset_complete = 1;
             break;
         }
 
         /* Once either bist or pci reset is done, restore PCI config
          * space. If this fails, proceed with hard reset again
          */
         pci_restore_state(pinstance->pdev);
 
         /* fail all pending commands */
         pmcraid_fail_outstanding_cmds(pinstance);
 
         /* check if unit check is active, if so extract dump */
         if (pinstance->ioa_unit_check) {
             pmcraid_info("unit check is active\n");
             pinstance->ioa_unit_check = 0;
             pmcraid_get_dump(pinstance);
             pinstance->ioa_reset_attempts--;
             pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
             pmcraid_reset_alert(cmd);
             break;
         }
 
         /* if the reset reason is to bring-down the ioa, we might be
          * done with the reset restore pci_config_space and complete
          * the reset
          */
         if (pinstance->ioa_bringdown) {
             pmcraid_info("bringing down the adapter\n");
             pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
             pinstance->ioa_bringdown = 0;
             pinstance->ioa_state = IOA_STATE_UNKNOWN;
             pmcraid_notify_ioastate(pinstance,
                     PMC_DEVICE_EVENT_SHUTDOWN_SUCCESS);
             reset_complete = 1;
         } else {
             /* bring-up IOA, so proceed with soft reset
              * Reinitialize hrrq_buffers and their indices also
              * enable interrupts after a pci_restore_state
              */
             if (pmcraid_reset_enable_ioa(pinstance)) {
                 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
                 pmcraid_info("bringing up the adapter\n");
                 pmcraid_reinit_cmdblk(cmd);
                 pmcraid_identify_hrrq(cmd);
             } else {
                 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
                 pmcraid_soft_reset(cmd);
             }
         }
         break;
 
     case IOA_STATE_IN_SOFT_RESET:
         /* TRANSITION TO OPERATIONAL is on so start initialization
          * sequence
          */
         pmcraid_info("In softreset proceeding with bring-up\n");
         pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
 
         /* Initialization commands start with HRRQ identification. From
          * now on tasklet completes most of the commands as IOA is up
          * and intrs are enabled
          */
         pmcraid_identify_hrrq(cmd);
         break;
 
     case IOA_STATE_IN_BRINGUP:
         /* we are done with bringing up of IOA, change the ioa_state to
          * operational and wake up any waiters
          */
         pinstance->ioa_state = IOA_STATE_OPERATIONAL;
         reset_complete = 1;
         break;
 
     case IOA_STATE_OPERATIONAL:
     default:
         /* When IOA is operational and a reset is requested, check for
          * the reset reason. If reset is to bring down IOA, unregister
          * HCAMs and initiate shutdown; if adapter reset is forced then
          * restart reset sequence again
          */
         if (pinstance->ioa_shutdown_type == SHUTDOWN_NONE &&
             pinstance->force_ioa_reset == 0) {
             pmcraid_notify_ioastate(pinstance,
                         PMC_DEVICE_EVENT_RESET_SUCCESS);
             reset_complete = 1;
         } else {
             if (pinstance->ioa_shutdown_type != SHUTDOWN_NONE)
                 pinstance->ioa_state = IOA_STATE_IN_BRINGDOWN;
             pmcraid_reinit_cmdblk(cmd);
             pmcraid_unregister_hcams(cmd);
         }
         break;
     }
 
     /* reset will be completed if ioa_state is either DEAD or UNKNOWN or
      * OPERATIONAL. Reset all control variables used during reset, wake up
      * any waiting threads and let the SCSI mid-layer send commands. Note
      * that host_lock must be held before invoking scsi_report_bus_reset.
      */
     if (reset_complete) {
         pinstance->ioa_reset_in_progress = 0;
         pinstance->ioa_reset_attempts = 0;
         pinstance->reset_cmd = NULL;
         pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
         pinstance->ioa_bringdown = 0;
         pmcraid_return_cmd(cmd);
 
         /* If target state is to bring up the adapter, proceed with
          * hcam registration and resource exposure to mid-layer.
          */
         if (pinstance->ioa_state == IOA_STATE_OPERATIONAL)
             pmcraid_register_hcams(pinstance);
 
         wake_up_all(&pinstance->reset_wait_q);
     }
 
     return;
 }
 
 /**
  * pmcraid_initiate_reset - initiates reset sequence. This is called from
  * ISR/tasklet during error interrupts including IOA unit check. If reset
  * is already in progress, it just returns, otherwise initiates IOA reset
  * to bring IOA up to operational state.
  *
  * @pinstance: pointer to adapter instance structure
  *
  * Return value
  *   none
  */
 static void pmcraid_initiate_reset(struct pmcraid_instance *pinstance)
 {
     struct pmcraid_cmd *cmd;
 
     /* If the reset is already in progress, just return, otherwise start
      * reset sequence and return
      */
     if (!pinstance->ioa_reset_in_progress) {
         scsi_block_requests(pinstance->host);
         cmd = pmcraid_get_free_cmd(pinstance);
 
         if (cmd == NULL) {
             pmcraid_err("no cmnd blocks for initiate_reset\n");
             return;
         }
 
         pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
         pinstance->reset_cmd = cmd;
         pinstance->force_ioa_reset = 1;
         pmcraid_notify_ioastate(pinstance,
                     PMC_DEVICE_EVENT_RESET_START);
         pmcraid_ioa_reset(cmd);
     }
 }
 
 /**
  * pmcraid_reset_reload - utility routine for doing IOA reset either to bringup
  *            or bringdown IOA
  * @pinstance: pointer adapter instance structure
  * @shutdown_type: shutdown type to be used NONE, NORMAL or ABRREV
  * @target_state: expected target state after reset
  *
  * Note: This command initiates reset and waits for its completion. Hence this
  * should not be called from isr/timer/tasklet functions (timeout handlers,
  * error response handlers and interrupt handlers).
  *
  * Return Value
  *   1 in case ioa_state is not target_state, 0 otherwise.
  */
 static int pmcraid_reset_reload(
     struct pmcraid_instance *pinstance,
     u8 shutdown_type,
     u8 target_state
 )
 {
     struct pmcraid_cmd *reset_cmd = NULL;
     unsigned long lock_flags;
     int reset = 1;
 
     spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
 
     if (pinstance->ioa_reset_in_progress) {
         pmcraid_info("reset_reload: reset is already in progress\n");
 
         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
 
         wait_event(pinstance->reset_wait_q,
                !pinstance->ioa_reset_in_progress);
 
         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
 
         if (pinstance->ioa_state == IOA_STATE_DEAD) {
             pmcraid_info("reset_reload: IOA is dead\n");
             goto out_unlock;
         }
 
         if (pinstance->ioa_state == target_state) {
             reset = 0;
             goto out_unlock;
         }
     }
 
     pmcraid_info("reset_reload: proceeding with reset\n");
     scsi_block_requests(pinstance->host);
     reset_cmd = pmcraid_get_free_cmd(pinstance);
     if (reset_cmd == NULL) {
         pmcraid_err("no free cmnd for reset_reload\n");
         goto out_unlock;
     }
 
     if (shutdown_type == SHUTDOWN_NORMAL)
         pinstance->ioa_bringdown = 1;
 
     pinstance->ioa_shutdown_type = shutdown_type;
     pinstance->reset_cmd = reset_cmd;
     pinstance->force_ioa_reset = reset;
     pmcraid_info("reset_reload: initiating reset\n");
     pmcraid_ioa_reset(reset_cmd);
     spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
     pmcraid_info("reset_reload: waiting for reset to complete\n");
     wait_event(pinstance->reset_wait_q,
            !pinstance->ioa_reset_in_progress);
 
     pmcraid_info("reset_reload: reset is complete !!\n");
     scsi_unblock_requests(pinstance->host);
     return pinstance->ioa_state != target_state;
 
 out_unlock:
     spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
     return reset;
 }
 
 /**
  * pmcraid_reset_bringdown - wrapper over pmcraid_reset_reload to bringdown IOA
  *
  * @pinstance: pointer to adapter instance structure
  *
  * Return Value
  *   whatever is returned from pmcraid_reset_reload
  */
 static int pmcraid_reset_bringdown(struct pmcraid_instance *pinstance)
 {
     return pmcraid_reset_reload(pinstance,
                     SHUTDOWN_NORMAL,
                     IOA_STATE_UNKNOWN);
 }
 
 /**
  * pmcraid_reset_bringup - wrapper over pmcraid_reset_reload to bring up IOA
  *
  * @pinstance: pointer to adapter instance structure
  *
  * Return Value
  *   whatever is returned from pmcraid_reset_reload
  */
 static int pmcraid_reset_bringup(struct pmcraid_instance *pinstance)
 {
     pmcraid_notify_ioastate(pinstance, PMC_DEVICE_EVENT_RESET_START);
 
     return pmcraid_reset_reload(pinstance,
                     SHUTDOWN_NONE,
                     IOA_STATE_OPERATIONAL);
 }
 
 /**
  * pmcraid_request_sense - Send request sense to a device
  * @cmd: pmcraid command struct
  *
  * This function sends a request sense to a device as a result of a check
  * condition. This method re-uses the same command block that failed earlier.
  */
 static void pmcraid_request_sense(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
     struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
     struct device *dev = &cmd->drv_inst->pdev->dev;
 
     cmd->sense_buffer = cmd->scsi_cmd->sense_buffer;
     cmd->sense_buffer_dma = dma_map_single(dev, cmd->sense_buffer,
             SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
     if (dma_mapping_error(dev, cmd->sense_buffer_dma)) {
         pmcraid_err
             ("couldn't allocate sense buffer for request sense\n");
         pmcraid_erp_done(cmd);
         return;
     }
 
     /* re-use the command block */
     memset(&cmd->ioa_cb->ioasa, 0, sizeof(struct pmcraid_ioasa));
     memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
     ioarcb->request_flags0 = (SYNC_COMPLETE |
                   NO_LINK_DESCS |
                   INHIBIT_UL_CHECK);
     ioarcb->request_type = REQ_TYPE_SCSI;
     ioarcb->cdb[0] = REQUEST_SENSE;
     ioarcb->cdb[4] = SCSI_SENSE_BUFFERSIZE;
 
     ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
                     offsetof(struct pmcraid_ioarcb,
                         add_data.u.ioadl[0]));
     ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
 
     ioarcb->data_transfer_length = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
 
     ioadl->address = cpu_to_le64(cmd->sense_buffer_dma);
     ioadl->data_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
     ioadl->flags = IOADL_FLAGS_LAST_DESC;
 
     /* request sense might be called as part of error response processing
      * which runs in tasklets context. It is possible that mid-layer might
      * schedule queuecommand during this time, hence, writting to IOARRIN
      * must be protect by host_lock
      */
     pmcraid_send_cmd(cmd, pmcraid_erp_done,
              PMCRAID_REQUEST_SENSE_TIMEOUT,
              pmcraid_timeout_handler);
 }
 
 /**
  * pmcraid_cancel_all - cancel all outstanding IOARCBs as part of error recovery
  * @cmd: command that failed
  * @need_sense: true if request_sense is required after cancel all
  *
  * This function sends a cancel all to a device to clear the queue.
  */
 static void pmcraid_cancel_all(struct pmcraid_cmd *cmd, bool need_sense)
 {
     struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
     struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
     struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
 
     memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
     ioarcb->request_flags0 = SYNC_OVERRIDE;
     ioarcb->request_type = REQ_TYPE_IOACMD;
     ioarcb->cdb[0] = PMCRAID_CANCEL_ALL_REQUESTS;
 
     if (RES_IS_GSCSI(res->cfg_entry))
         ioarcb->cdb[1] = PMCRAID_SYNC_COMPLETE_AFTER_CANCEL;
 
     ioarcb->ioadl_bus_addr = 0;
     ioarcb->ioadl_length = 0;
     ioarcb->data_transfer_length = 0;
     ioarcb->ioarcb_bus_addr &= cpu_to_le64((~0x1FULL));
 
     /* writing to IOARRIN must be protected by host_lock, as mid-layer
      * schedule queuecommand while we are doing this
      */
     pmcraid_send_cmd(cmd, need_sense ?
              pmcraid_erp_done : pmcraid_request_sense,
              PMCRAID_REQUEST_SENSE_TIMEOUT,
              pmcraid_timeout_handler);
 }
 
 /**
  * pmcraid_frame_auto_sense: frame fixed format sense information
  *
  * @cmd: pointer to failing command block
  *
  * Return value
  *  none
  */
 static void pmcraid_frame_auto_sense(struct pmcraid_cmd *cmd)
 {
     u8 *sense_buf = cmd->scsi_cmd->sense_buffer;
     struct pmcraid_resource_entry *res = cmd->scsi_cmd->device->hostdata;
     struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
     u32 ioasc = le32_to_cpu(ioasa->ioasc);
     u32 failing_lba = 0;
 
     memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
     cmd->scsi_cmd->result = SAM_STAT_CHECK_CONDITION;
 
     if (RES_IS_VSET(res->cfg_entry) &&
         ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC &&
         ioasa->u.vset.failing_lba_hi != 0) {
 
         sense_buf[0] = 0x72;
         sense_buf[1] = PMCRAID_IOASC_SENSE_KEY(ioasc);
         sense_buf[2] = PMCRAID_IOASC_SENSE_CODE(ioasc);
         sense_buf[3] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
 
         sense_buf[7] = 12;
         sense_buf[8] = 0;
         sense_buf[9] = 0x0A;
         sense_buf[10] = 0x80;
 
         failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_hi);
 
         sense_buf[12] = (failing_lba & 0xff000000) >> 24;
         sense_buf[13] = (failing_lba & 0x00ff0000) >> 16;
         sense_buf[14] = (failing_lba & 0x0000ff00) >> 8;
         sense_buf[15] = failing_lba & 0x000000ff;
 
         failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_lo);
 
         sense_buf[16] = (failing_lba & 0xff000000) >> 24;
         sense_buf[17] = (failing_lba & 0x00ff0000) >> 16;
         sense_buf[18] = (failing_lba & 0x0000ff00) >> 8;
         sense_buf[19] = failing_lba & 0x000000ff;
     } else {
         sense_buf[0] = 0x70;
         sense_buf[2] = PMCRAID_IOASC_SENSE_KEY(ioasc);
         sense_buf[12] = PMCRAID_IOASC_SENSE_CODE(ioasc);
         sense_buf[13] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
 
         if (ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC) {
             if (RES_IS_VSET(res->cfg_entry))
                 failing_lba =
                     le32_to_cpu(ioasa->u.
                          vset.failing_lba_lo);
             sense_buf[0] |= 0x80;
             sense_buf[3] = (failing_lba >> 24) & 0xff;
             sense_buf[4] = (failing_lba >> 16) & 0xff;
             sense_buf[5] = (failing_lba >> 8) & 0xff;
             sense_buf[6] = failing_lba & 0xff;
         }
 
         sense_buf[7] = 6; /* additional length */
     }
 }
 
 /**
  * pmcraid_error_handler - Error response handlers for a SCSI op
  * @cmd: pointer to pmcraid_cmd that has failed
  *
  * This function determines whether or not to initiate ERP on the affected
  * device. This is called from a tasklet, which doesn't hold any locks.
  *
  * Return value:
  *   0 it caller can complete the request, otherwise 1 where in error
  *   handler itself completes the request and returns the command block
  *   back to free-pool
  */
 static int pmcraid_error_handler(struct pmcraid_cmd *cmd)
 {
     struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
     struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
     u32 ioasc = le32_to_cpu(ioasa->ioasc);
     u32 masked_ioasc = ioasc & PMCRAID_IOASC_SENSE_MASK;
     bool sense_copied = false;
 
     if (!res) {
         pmcraid_info("resource pointer is NULL\n");
         return 0;
     }
 
     /* If this was a SCSI read/write command keep count of errors */
     if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_READ_CMD)
         atomic_inc(&res->read_failures);
     else if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_WRITE_CMD)
         atomic_inc(&res->write_failures);
 
     if (!RES_IS_GSCSI(res->cfg_entry) &&
         masked_ioasc != PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR) {
         pmcraid_frame_auto_sense(cmd);
     }
 
     /* Log IOASC/IOASA information based on user settings */
     pmcraid_ioasc_logger(ioasc, cmd);
 
     switch (masked_ioasc) {
 
     case PMCRAID_IOASC_AC_TERMINATED_BY_HOST:
         scsi_cmd->result |= (DID_ABORT << 16);
         break;
 
     case PMCRAID_IOASC_IR_INVALID_RESOURCE_HANDLE:
     case PMCRAID_IOASC_HW_CANNOT_COMMUNICATE:
         scsi_cmd->result |= (DID_NO_CONNECT << 16);
         break;
 
     case PMCRAID_IOASC_NR_SYNC_REQUIRED:
         res->sync_reqd = 1;
         scsi_cmd->result |= (DID_IMM_RETRY << 16);
         break;
 
     case PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC:
         scsi_cmd->result |= (DID_PASSTHROUGH << 16);
         break;
 
     case PMCRAID_IOASC_UA_BUS_WAS_RESET:
     case PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER:
         if (!res->reset_progress)
             scsi_report_bus_reset(pinstance->host,
                           scsi_cmd->device->channel);
         scsi_cmd->result |= (DID_ERROR << 16);
         break;
 
     case PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR:
         scsi_cmd->result |= PMCRAID_IOASC_SENSE_STATUS(ioasc);
         res->sync_reqd = 1;
 
         /* if check_condition is not active return with error otherwise
          * get/frame the sense buffer
          */
         if (PMCRAID_IOASC_SENSE_STATUS(ioasc) !=
             SAM_STAT_CHECK_CONDITION &&
             PMCRAID_IOASC_SENSE_STATUS(ioasc) != SAM_STAT_ACA_ACTIVE)
             return 0;
 
         /* If we have auto sense data as part of IOASA pass it to
          * mid-layer
          */
         if (ioasa->auto_sense_length != 0) {
             short sense_len = le16_to_cpu(ioasa->auto_sense_length);
             int data_size = min_t(u16, sense_len,
                           SCSI_SENSE_BUFFERSIZE);
 
             memcpy(scsi_cmd->sense_buffer,
                    ioasa->sense_data,
                    data_size);
             sense_copied = true;
         }
 
         if (RES_IS_GSCSI(res->cfg_entry))
             pmcraid_cancel_all(cmd, sense_copied);
         else if (sense_copied)
             pmcraid_erp_done(cmd);
         else
             pmcraid_request_sense(cmd);
 
         return 1;
 
     case PMCRAID_IOASC_NR_INIT_CMD_REQUIRED:
         break;
 
     default:
         if (PMCRAID_IOASC_SENSE_KEY(ioasc) > RECOVERED_ERROR)
             scsi_cmd->result |= (DID_ERROR << 16);
         break;
     }
     return 0;
 }
 
 /**
  * pmcraid_reset_device - device reset handler functions
  *
  * @scsi_cmd: scsi command struct
  * @timeout: command timeout
  * @modifier: reset modifier indicating the reset sequence to be performed
  *
  * This function issues a device reset to the affected device.
  * A LUN reset will be sent to the device first. If that does
  * not work, a target reset will be sent.
  *
  * Return value:
  *  SUCCESS / FAILED
  */
 static int pmcraid_reset_device(
     struct scsi_cmnd *scsi_cmd,
     unsigned long timeout,
     u8 modifier)
 {
     struct pmcraid_cmd *cmd;
     struct pmcraid_instance *pinstance;
     struct pmcraid_resource_entry *res;
     struct pmcraid_ioarcb *ioarcb;
     unsigned long lock_flags;
     u32 ioasc;
 
     pinstance =
         (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
     res = scsi_cmd->device->hostdata;
 
     if (!res) {
         sdev_printk(KERN_ERR, scsi_cmd->device,
                 "reset_device: NULL resource pointer\n");
         return FAILED;
     }
 
     /* If adapter is currently going through reset/reload, return failed.
      * This will force the mid-layer to call _eh_bus/host reset, which
      * will then go to sleep and wait for the reset to complete
      */
     spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
     if (pinstance->ioa_reset_in_progress ||
         pinstance->ioa_state == IOA_STATE_DEAD) {
         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
         return FAILED;
     }
 
     res->reset_progress = 1;
     pmcraid_info("Resetting %s resource with addr %x\n",
              ((modifier & RESET_DEVICE_LUN) ? "LUN" :
              ((modifier & RESET_DEVICE_TARGET) ? "TARGET" : "BUS")),
              le32_to_cpu(res->cfg_entry.resource_address));
 
     /* get a free cmd block */
     cmd = pmcraid_get_free_cmd(pinstance);
 
     if (cmd == NULL) {
         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
         pmcraid_err("%s: no cmd blocks are available\n", __func__);
         return FAILED;
     }
 
     ioarcb = &cmd->ioa_cb->ioarcb;
     ioarcb->resource_handle = res->cfg_entry.resource_handle;
     ioarcb->request_type = REQ_TYPE_IOACMD;
     ioarcb->cdb[0] = PMCRAID_RESET_DEVICE;
 
     /* Initialize reset modifier bits */
     if (modifier)
         modifier = ENABLE_RESET_MODIFIER | modifier;
 
     ioarcb->cdb[1] = modifier;
 
     init_completion(&cmd->wait_for_completion);
     cmd->completion_req = 1;
 
     pmcraid_info("cmd(CDB[0] = %x) for %x with index = %d\n",
              cmd->ioa_cb->ioarcb.cdb[0],
              le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
              le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);
 
     pmcraid_send_cmd(cmd,
              pmcraid_internal_done,
              timeout,
              pmcraid_timeout_handler);
 
     spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
 
     /* RESET_DEVICE command completes after all pending IOARCBs are
      * completed. Once this command is completed, pmcraind_internal_done
      * will wake up the 'completion' queue.
      */
     wait_for_completion(&cmd->wait_for_completion);
 
     /* complete the command here itself and return the command block
      * to free list
      */
     pmcraid_return_cmd(cmd);
     res->reset_progress = 0;
     ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
 
     /* set the return value based on the returned ioasc */
     return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
 }
 
 /**
  * _pmcraid_io_done - helper for pmcraid_io_done function
  *
  * @cmd: pointer to pmcraid command struct
  * @reslen: residual data length to be set in the ioasa
  * @ioasc: ioasc either returned by IOA or set by driver itself.
  *
  * This function is invoked by pmcraid_io_done to complete mid-layer
  * scsi ops.
  *
  * Return value:
  *    0 if caller is required to return it to free_pool. Returns 1 if
  *    caller need not worry about freeing command block as error handler
  *    will take care of that.
  */
 
 static int _pmcraid_io_done(struct pmcraid_cmd *cmd, int reslen, int ioasc)
 {
     struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
     int rc = 0;
 
     scsi_set_resid(scsi_cmd, reslen);
 
     pmcraid_info("response(%d) CDB[0] = %x ioasc:result: %x:%x\n",
         le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
         cmd->ioa_cb->ioarcb.cdb[0],
         ioasc, scsi_cmd->result);
 
     if (PMCRAID_IOASC_SENSE_KEY(ioasc) != 0)
         rc = pmcraid_error_handler(cmd);
 
     if (rc == 0) {
         scsi_dma_unmap(scsi_cmd);
         scsi_done(scsi_cmd);
     }
 
     return rc;
 }
 
 /**
  * pmcraid_io_done - SCSI completion function
  *
  * @cmd: pointer to pmcraid command struct
  *
  * This function is invoked by tasklet/mid-layer error handler to completing
  * the SCSI ops sent from mid-layer.
  *
  * Return value
  *    none
  */
 
 static void pmcraid_io_done(struct pmcraid_cmd *cmd)
 {
     u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
     u32 reslen = le32_to_cpu(cmd->ioa_cb->ioasa.residual_data_length);
 
     if (_pmcraid_io_done(cmd, reslen, ioasc) == 0)
         pmcraid_return_cmd(cmd);
 }
 
 /**
  * pmcraid_abort_cmd - Aborts a single IOARCB already submitted to IOA
  *
  * @cmd: command block of the command to be aborted
  *
  * Return Value:
  *   returns pointer to command structure used as cancelling cmd
  */
 static struct pmcraid_cmd *pmcraid_abort_cmd(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_cmd *cancel_cmd;
     struct pmcraid_instance *pinstance;
 
     pinstance = (struct pmcraid_instance *)cmd->drv_inst;
 
     cancel_cmd = pmcraid_get_free_cmd(pinstance);
 
     if (cancel_cmd == NULL) {
         pmcraid_err("%s: no cmd blocks are available\n", __func__);
         return NULL;
     }
 
     pmcraid_prepare_cancel_cmd(cancel_cmd, cmd);
 
     pmcraid_info("aborting command CDB[0]= %x with index = %d\n",
         cmd->ioa_cb->ioarcb.cdb[0],
         le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);
 
     init_completion(&cancel_cmd->wait_for_completion);
     cancel_cmd->completion_req = 1;
 
     pmcraid_info("command (%d) CDB[0] = %x for %x\n",
         le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.response_handle) >> 2,
         cancel_cmd->ioa_cb->ioarcb.cdb[0],
         le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.resource_handle));
 
     pmcraid_send_cmd(cancel_cmd,
              pmcraid_internal_done,
              PMCRAID_INTERNAL_TIMEOUT,
              pmcraid_timeout_handler);
     return cancel_cmd;
 }
 
 /**
  * pmcraid_abort_complete - Waits for ABORT TASK completion
  *
  * @cancel_cmd: command block use as cancelling command
  *
  * Return Value:
  *   returns SUCCESS if ABORT TASK has good completion
  *   otherwise FAILED
  */
 static int pmcraid_abort_complete(struct pmcraid_cmd *cancel_cmd)
 {
     struct pmcraid_resource_entry *res;
     u32 ioasc;
 
     wait_for_completion(&cancel_cmd->wait_for_completion);
     res = cancel_cmd->res;
     cancel_cmd->res = NULL;
     ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc);
 
     /* If the abort task is not timed out we will get a Good completion
      * as sense_key, otherwise we may get one the following responses
      * due to subsequent bus reset or device reset. In case IOASC is
      * NR_SYNC_REQUIRED, set sync_reqd flag for the corresponding resource
      */
     if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
         ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED) {
         if (ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED)
             res->sync_reqd = 1;
         ioasc = 0;
     }
 
     /* complete the command here itself */
     pmcraid_return_cmd(cancel_cmd);
     return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
 }
 
 /**
  * pmcraid_eh_abort_handler - entry point for aborting a single task on errors
  *
  * @scsi_cmd:   scsi command struct given by mid-layer. When this is called
  *      mid-layer ensures that no other commands are queued. This
  *      never gets called under interrupt, but a separate eh thread.
  *
  * Return value:
  *   SUCCESS / FAILED
  */
 static int pmcraid_eh_abort_handler(struct scsi_cmnd *scsi_cmd)
 {
     struct pmcraid_instance *pinstance;
     struct pmcraid_cmd *cmd;
     struct pmcraid_resource_entry *res;
     unsigned long host_lock_flags;
     unsigned long pending_lock_flags;
     struct pmcraid_cmd *cancel_cmd = NULL;
     int cmd_found = 0;
     int rc = FAILED;
 
     pinstance =
         (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
 
     scmd_printk(KERN_INFO, scsi_cmd,
             "I/O command timed out, aborting it.\n");
 
     res = scsi_cmd->device->hostdata;
 
     if (res == NULL)
         return rc;
 
     /* If we are currently going through reset/reload, return failed.
      * This will force the mid-layer to eventually call
      * pmcraid_eh_host_reset which will then go to sleep and wait for the
      * reset to complete
      */
     spin_lock_irqsave(pinstance->host->host_lock, host_lock_flags);
 
     if (pinstance->ioa_reset_in_progress ||
         pinstance->ioa_state == IOA_STATE_DEAD) {
         spin_unlock_irqrestore(pinstance->host->host_lock,
                        host_lock_flags);
         return rc;
     }
 
     /* loop over pending cmd list to find cmd corresponding to this
      * scsi_cmd. Note that this command might not have been completed
      * already. locking: all pending commands are protected with
      * pending_pool_lock.
      */
     spin_lock_irqsave(&pinstance->pending_pool_lock, pending_lock_flags);
     list_for_each_entry(cmd, &pinstance->pending_cmd_pool, free_list) {
 
         if (cmd->scsi_cmd == scsi_cmd) {
             cmd_found = 1;
             break;
         }
     }
 
     spin_unlock_irqrestore(&pinstance->pending_pool_lock,
                 pending_lock_flags);
 
     /* If the command to be aborted was given to IOA and still pending with
      * it, send ABORT_TASK to abort this and wait for its completion
      */
     if (cmd_found)
         cancel_cmd = pmcraid_abort_cmd(cmd);
 
     spin_unlock_irqrestore(pinstance->host->host_lock,
                    host_lock_flags);
 
     if (cancel_cmd) {
         cancel_cmd->res = cmd->scsi_cmd->device->hostdata;
         rc = pmcraid_abort_complete(cancel_cmd);
     }
 
     return cmd_found ? rc : SUCCESS;
 }
 
 /**
  * pmcraid_eh_device_reset_handler - bus/target/device reset handler callbacks
  *
  * @scmd: pointer to scsi_cmd that was sent to the resource to be reset.
  *
  * All these routines invokve pmcraid_reset_device with appropriate parameters.
  * Since these are called from mid-layer EH thread, no other IO will be queued
  * to the resource being reset. However, control path (IOCTL) may be active so
  * it is necessary to synchronize IOARRIN writes which pmcraid_reset_device
  * takes care by locking/unlocking host_lock.
  *
  * Return value
  *  SUCCESS or FAILED
  */
 static int pmcraid_eh_device_reset_handler(struct scsi_cmnd *scmd)
 {
     scmd_printk(KERN_INFO, scmd,
             "resetting device due to an I/O command timeout.\n");
     return pmcraid_reset_device(scmd,
                     PMCRAID_INTERNAL_TIMEOUT,
                     RESET_DEVICE_LUN);
 }
 
 static int pmcraid_eh_bus_reset_handler(struct scsi_cmnd *scmd)
 {
     scmd_printk(KERN_INFO, scmd,
             "Doing bus reset due to an I/O command timeout.\n");
     return pmcraid_reset_device(scmd,
                     PMCRAID_RESET_BUS_TIMEOUT,
                     RESET_DEVICE_BUS);
 }
 
 static int pmcraid_eh_target_reset_handler(struct scsi_cmnd *scmd)
 {
     scmd_printk(KERN_INFO, scmd,
             "Doing target reset due to an I/O command timeout.\n");
     return pmcraid_reset_device(scmd,
                     PMCRAID_INTERNAL_TIMEOUT,
                     RESET_DEVICE_TARGET);
 }
 
 /**
  * pmcraid_eh_host_reset_handler - adapter reset handler callback
  *
  * @scmd: pointer to scsi_cmd that was sent to a resource of adapter
  *
  * Initiates adapter reset to bring it up to operational state
  *
  * Return value
  *  SUCCESS or FAILED
  */
 static int pmcraid_eh_host_reset_handler(struct scsi_cmnd *scmd)
 {
     unsigned long interval = 10000; /* 10 seconds interval */
     int waits = jiffies_to_msecs(PMCRAID_RESET_HOST_TIMEOUT) / interval;
     struct pmcraid_instance *pinstance =
         (struct pmcraid_instance *)(scmd->device->host->hostdata);
 
 
     /* wait for an additional 150 seconds just in case firmware could come
      * up and if it could complete all the pending commands excluding the
      * two HCAM (CCN and LDN).
      */
     while (waits--) {
         if (atomic_read(&pinstance->outstanding_cmds) <=
             PMCRAID_MAX_HCAM_CMD)
             return SUCCESS;
         msleep(interval);
     }
 
     dev_err(&pinstance->pdev->dev,
         "Adapter being reset due to an I/O command timeout.\n");
     return pmcraid_reset_bringup(pinstance) == 0 ? SUCCESS : FAILED;
 }
 
 /**
  * pmcraid_init_ioadls - initializes IOADL related fields in IOARCB
  * @cmd: pmcraid command struct
  * @sgcount: count of scatter-gather elements
  *
  * Return value
  *   returns pointer pmcraid_ioadl_desc, initialized to point to internal
  *   or external IOADLs
  */
 static struct pmcraid_ioadl_desc *
 pmcraid_init_ioadls(struct pmcraid_cmd *cmd, int sgcount)
 {
     struct pmcraid_ioadl_desc *ioadl;
     struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
     int ioadl_count = 0;
 
     if (ioarcb->add_cmd_param_length)
         ioadl_count = DIV_ROUND_UP(le16_to_cpu(ioarcb->add_cmd_param_length), 16);
     ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc) * sgcount);
 
     if ((sgcount + ioadl_count) > (ARRAY_SIZE(ioarcb->add_data.u.ioadl))) {
         /* external ioadls start at offset 0x80 from control_block
          * structure, re-using 24 out of 27 ioadls part of IOARCB.
          * It is necessary to indicate to firmware that driver is
          * using ioadls to be treated as external to IOARCB.
          */
         ioarcb->ioarcb_bus_addr &= cpu_to_le64(~(0x1FULL));
         ioarcb->ioadl_bus_addr =
             cpu_to_le64((cmd->ioa_cb_bus_addr) +
                 offsetof(struct pmcraid_ioarcb,
                     add_data.u.ioadl[3]));
         ioadl = &ioarcb->add_data.u.ioadl[3];
     } else {
         ioarcb->ioadl_bus_addr =
             cpu_to_le64((cmd->ioa_cb_bus_addr) +
                 offsetof(struct pmcraid_ioarcb,
                     add_data.u.ioadl[ioadl_count]));
 
         ioadl = &ioarcb->add_data.u.ioadl[ioadl_count];
         ioarcb->ioarcb_bus_addr |=
             cpu_to_le64(DIV_ROUND_CLOSEST(sgcount + ioadl_count, 8));
     }
 
     return ioadl;
 }
 
 /**
  * pmcraid_build_ioadl - Build a scatter/gather list and map the buffer
  * @pinstance: pointer to adapter instance structure
  * @cmd: pmcraid command struct
  *
  * This function is invoked by queuecommand entry point while sending a command
  * to firmware. This builds ioadl descriptors and sets up ioarcb fields.
  *
  * Return value:
  *  0 on success or -1 on failure
  */
 static int pmcraid_build_ioadl(
     struct pmcraid_instance *pinstance,
     struct pmcraid_cmd *cmd
 )
 {
     int i, nseg;
     struct scatterlist *sglist;
 
     struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
     struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
     struct pmcraid_ioadl_desc *ioadl;
 
     u32 length = scsi_bufflen(scsi_cmd);
 
     if (!length)
         return 0;
 
     nseg = scsi_dma_map(scsi_cmd);
 
     if (nseg < 0) {
         scmd_printk(KERN_ERR, scsi_cmd, "scsi_map_dma failed!\n");
         return -1;
     } else if (nseg > PMCRAID_MAX_IOADLS) {
         scsi_dma_unmap(scsi_cmd);
         scmd_printk(KERN_ERR, scsi_cmd,
             "sg count is (%d) more than allowed!\n", nseg);
         return -1;
     }
 
     /* Initialize IOARCB data transfer length fields */
     if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE)
         ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
 
     ioarcb->request_flags0 |= NO_LINK_DESCS;
     ioarcb->data_transfer_length = cpu_to_le32(length);
     ioadl = pmcraid_init_ioadls(cmd, nseg);
 
     /* Initialize IOADL descriptor addresses */
     scsi_for_each_sg(scsi_cmd, sglist, nseg, i) {
         ioadl[i].data_len = cpu_to_le32(sg_dma_len(sglist));
         ioadl[i].address = cpu_to_le64(sg_dma_address(sglist));
         ioadl[i].flags = 0;
     }
     /* setup last descriptor */
     ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
 
     return 0;
 }
 
 /**
  * pmcraid_queuecommand_lck - Queue a mid-layer request
  * @scsi_cmd: scsi command struct
  *
  * This function queues a request generated by the mid-layer. Midlayer calls
  * this routine within host->lock. Some of the functions called by queuecommand
  * would use cmd block queue locks (free_pool_lock and pending_pool_lock)
  *
  * Return value:
  *    0 on success
  *    SCSI_MLQUEUE_DEVICE_BUSY if device is busy
  *    SCSI_MLQUEUE_HOST_BUSY if host is busy
  */
 static int pmcraid_queuecommand_lck(struct scsi_cmnd *scsi_cmd)
 {
     struct pmcraid_instance *pinstance;
     struct pmcraid_resource_entry *res;
     struct pmcraid_ioarcb *ioarcb;
     struct pmcraid_cmd *cmd;
     u32 fw_version;
     int rc = 0;
 
     pinstance =
         (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
     fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
     res = scsi_cmd->device->hostdata;
     scsi_cmd->result = (DID_OK << 16);
 
     /* if adapter is marked as dead, set result to DID_NO_CONNECT complete
      * the command
      */
     if (pinstance->ioa_state == IOA_STATE_DEAD) {
         pmcraid_info("IOA is dead, but queuecommand is scheduled\n");
         scsi_cmd->result = (DID_NO_CONNECT << 16);
         scsi_done(scsi_cmd);
         return 0;
     }
 
     /* If IOA reset is in progress, can't queue the commands */
     if (pinstance->ioa_reset_in_progress)
         return SCSI_MLQUEUE_HOST_BUSY;
 
     /* Firmware doesn't support SYNCHRONIZE_CACHE command (0x35), complete
      * the command here itself with success return
      */
     if (scsi_cmd->cmnd[0] == SYNCHRONIZE_CACHE) {
         pmcraid_info("SYNC_CACHE(0x35), completing in driver itself\n");
         scsi_done(scsi_cmd);
         return 0;
     }
 
     /* initialize the command and IOARCB to be sent to IOA */
     cmd = pmcraid_get_free_cmd(pinstance);
 
     if (cmd == NULL) {
         pmcraid_err("free command block is not available\n");
         return SCSI_MLQUEUE_HOST_BUSY;
     }
 
     cmd->scsi_cmd = scsi_cmd;
     ioarcb = &(cmd->ioa_cb->ioarcb);
     memcpy(ioarcb->cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len);
     ioarcb->resource_handle = res->cfg_entry.resource_handle;
     ioarcb->request_type = REQ_TYPE_SCSI;
 
     /* set hrrq number where the IOA should respond to. Note that all cmds
      * generated internally uses hrrq_id 0, exception to this is the cmd
      * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
      * hrrq_id assigned here in queuecommand
      */
     ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
               pinstance->num_hrrq;
     cmd->cmd_done = pmcraid_io_done;
 
     if (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)) {
         if (scsi_cmd->underflow == 0)
             ioarcb->request_flags0 |= INHIBIT_UL_CHECK;
 
         if (res->sync_reqd) {
             ioarcb->request_flags0 |= SYNC_COMPLETE;
             res->sync_reqd = 0;
         }
 
         ioarcb->request_flags0 |= NO_LINK_DESCS;
 
         if (scsi_cmd->flags & SCMD_TAGGED)
             ioarcb->request_flags1 |= TASK_TAG_SIMPLE;
 
         if (RES_IS_GSCSI(res->cfg_entry))
             ioarcb->request_flags1 |= DELAY_AFTER_RESET;
     }
 
     rc = pmcraid_build_ioadl(pinstance, cmd);
 
     pmcraid_info("command (%d) CDB[0] = %x for %x:%x:%x:%x\n",
              le32_to_cpu(ioarcb->response_handle) >> 2,
              scsi_cmd->cmnd[0], pinstance->host->unique_id,
              RES_IS_VSET(res->cfg_entry) ? PMCRAID_VSET_BUS_ID :
             PMCRAID_PHYS_BUS_ID,
              RES_IS_VSET(res->cfg_entry) ?
             (fw_version <= PMCRAID_FW_VERSION_1 ?
                 res->cfg_entry.unique_flags1 :
                 le16_to_cpu(res->cfg_entry.array_id) & 0xFF) :
             RES_TARGET(res->cfg_entry.resource_address),
              RES_LUN(res->cfg_entry.resource_address));
 
     if (likely(rc == 0)) {
         _pmcraid_fire_command(cmd);
     } else {
         pmcraid_err("queuecommand could not build ioadl\n");
         pmcraid_return_cmd(cmd);
         rc = SCSI_MLQUEUE_HOST_BUSY;
     }
 
     return rc;
 }
 
 static DEF_SCSI_QCMD(pmcraid_queuecommand)
 
 /*
  * pmcraid_open -char node "open" entry, allowed only users with admin access
  */
 static int pmcraid_chr_open(struct inode *inode, struct file *filep)
 {
     struct pmcraid_instance *pinstance;
 
     if (!capable(CAP_SYS_ADMIN))
         return -EACCES;
 
     /* Populate adapter instance * pointer for use by ioctl */
     pinstance = container_of(inode->i_cdev, struct pmcraid_instance, cdev);
     filep->private_data = pinstance;
 
     return 0;
 }
 
 /*
  * pmcraid_fasync - Async notifier registration from applications
  *
  * This function adds the calling process to a driver global queue. When an
  * event occurs, SIGIO will be sent to all processes in this queue.
  */
 static int pmcraid_chr_fasync(int fd, struct file *filep, int mode)
 {
     struct pmcraid_instance *pinstance;
     int rc;
 
     pinstance = filep->private_data;
     mutex_lock(&pinstance->aen_queue_lock);
     rc = fasync_helper(fd, filep, mode, &pinstance->aen_queue);
     mutex_unlock(&pinstance->aen_queue_lock);
 
     return rc;
 }
 
 /**
  * pmcraid_ioctl_driver - ioctl handler for commands handled by driver itself
  *
  * @pinstance: pointer to adapter instance structure
  * @cmd: ioctl command passed in
  * @buflen: length of user_buffer
  * @user_buffer: user buffer pointer
  *
  * Return Value
  *   0 in case of success, otherwise appropriate error code
  */
 static long pmcraid_ioctl_driver(
     struct pmcraid_instance *pinstance,
     unsigned int cmd,
     unsigned int buflen,
     void __user *user_buffer
 )
 {
     int rc = -ENOSYS;
 
     switch (cmd) {
     case PMCRAID_IOCTL_RESET_ADAPTER:
         pmcraid_reset_bringup(pinstance);
         rc = 0;
         break;
 
     default:
         break;
     }
 
     return rc;
 }
 
 /**
  * pmcraid_check_ioctl_buffer - check for proper access to user buffer
  *
  * @cmd: ioctl command
  * @arg: user buffer
  * @hdr: pointer to kernel memory for pmcraid_ioctl_header
  *
  * Return Value
  *  negetive error code if there are access issues, otherwise zero.
  *  Upon success, returns ioctl header copied out of user buffer.
  */
 
 static int pmcraid_check_ioctl_buffer(
     int cmd,
     void __user *arg,
     struct pmcraid_ioctl_header *hdr
 )
 {
     int rc;
 
     if (copy_from_user(hdr, arg, sizeof(struct pmcraid_ioctl_header))) {
         pmcraid_err("couldn't copy ioctl header from user buffer\n");
         return -EFAULT;
     }
 
     /* check for valid driver signature */
     rc = memcmp(hdr->signature,
             PMCRAID_IOCTL_SIGNATURE,
             sizeof(hdr->signature));
     if (rc) {
         pmcraid_err("signature verification failed\n");
         return -EINVAL;
     }
 
     return 0;
 }
 
 /*
  *  pmcraid_ioctl - char node ioctl entry point
  */
 static long pmcraid_chr_ioctl(
     struct file *filep,
     unsigned int cmd,
     unsigned long arg
 )
 {
     struct pmcraid_instance *pinstance = NULL;
     struct pmcraid_ioctl_header *hdr = NULL;
     void __user *argp = (void __user *)arg;
     int retval = -ENOTTY;
 
     hdr = kmalloc(sizeof(struct pmcraid_ioctl_header), GFP_KERNEL);
 
     if (!hdr) {
         pmcraid_err("failed to allocate memory for ioctl header\n");
         return -ENOMEM;
     }
 
     retval = pmcraid_check_ioctl_buffer(cmd, argp, hdr);
 
     if (retval) {
         pmcraid_info("chr_ioctl: header check failed\n");
         kfree(hdr);
         return retval;
     }
 
     pinstance = filep->private_data;
 
     if (!pinstance) {
         pmcraid_info("adapter instance is not found\n");
         kfree(hdr);
         return -ENOTTY;
     }
 
     switch (_IOC_TYPE(cmd)) {
 
     case PMCRAID_DRIVER_IOCTL:
         arg += sizeof(struct pmcraid_ioctl_header);
         retval = pmcraid_ioctl_driver(pinstance, cmd,
                           hdr->buffer_length, argp);
         break;
 
     default:
         retval = -ENOTTY;
         break;
     }
 
     kfree(hdr);
 
     return retval;
 }
 
 /*
  * File operations structure for management interface
  */
 static const struct file_operations pmcraid_fops = {
     .owner = THIS_MODULE,
     .open = pmcraid_chr_open,
     .fasync = pmcraid_chr_fasync,
     .unlocked_ioctl = pmcraid_chr_ioctl,
     .compat_ioctl = compat_ptr_ioctl,
     .llseek = noop_llseek,
 };
 
 
 
 
 /**
  * pmcraid_show_log_level - Display adapter's error logging level
  * @dev: class device struct
  * @attr: unused
  * @buf: buffer
  *
  * Return value:
  *  number of bytes printed to buffer
  */
 static ssize_t pmcraid_show_log_level(
     struct device *dev,
     struct device_attribute *attr,
     char *buf)
 {
     struct Scsi_Host *shost = class_to_shost(dev);
     struct pmcraid_instance *pinstance =
         (struct pmcraid_instance *)shost->hostdata;
     return snprintf(buf, PAGE_SIZE, "%d\n", pinstance->current_log_level);
 }
 
 /**
  * pmcraid_store_log_level - Change the adapter's error logging level
  * @dev: class device struct
  * @attr: unused
  * @buf: buffer
  * @count: not used
  *
  * Return value:
  *  number of bytes printed to buffer
  */
 static ssize_t pmcraid_store_log_level(
     struct device *dev,
     struct device_attribute *attr,
     const char *buf,
     size_t count
 )
 {
     struct Scsi_Host *shost;
     struct pmcraid_instance *pinstance;
     u8 val;
 
     if (kstrtou8(buf, 10, &val))
         return -EINVAL;
     /* log-level should be from 0 to 2 */
     if (val > 2)
         return -EINVAL;
 
     shost = class_to_shost(dev);
     pinstance = (struct pmcraid_instance *)shost->hostdata;
     pinstance->current_log_level = val;
 
     return strlen(buf);
 }
 
 static struct device_attribute pmcraid_log_level_attr = {
     .attr = {
          .name = "log_level",
          .mode = S_IRUGO | S_IWUSR,
          },
     .show = pmcraid_show_log_level,
     .store = pmcraid_store_log_level,
 };
 
 /**
  * pmcraid_show_drv_version - Display driver version
  * @dev: class device struct
  * @attr: unused
  * @buf: buffer
  *
  * Return value:
  *  number of bytes printed to buffer
  */
 static ssize_t pmcraid_show_drv_version(
     struct device *dev,
     struct device_attribute *attr,
     char *buf
 )
 {
     return snprintf(buf, PAGE_SIZE, "version: %s\n",
             PMCRAID_DRIVER_VERSION);
 }
 
 static struct device_attribute pmcraid_driver_version_attr = {
     .attr = {
          .name = "drv_version",
          .mode = S_IRUGO,
          },
     .show = pmcraid_show_drv_version,
 };
 
 /**
  * pmcraid_show_adapter_id - Display driver assigned adapter id
  * @dev: class device struct
  * @attr: unused
  * @buf: buffer
  *
  * Return value:
  *  number of bytes printed to buffer
  */
 static ssize_t pmcraid_show_adapter_id(
     struct device *dev,
     struct device_attribute *attr,
     char *buf
 )
 {
     struct Scsi_Host *shost = class_to_shost(dev);
     struct pmcraid_instance *pinstance =
         (struct pmcraid_instance *)shost->hostdata;
     u32 adapter_id = (pinstance->pdev->bus->number << 8) |
         pinstance->pdev->devfn;
     u32 aen_group = pmcraid_event_family.id;
 
     return snprintf(buf, PAGE_SIZE,
             "adapter id: %d\nminor: %d\naen group: %d\n",
             adapter_id, MINOR(pinstance->cdev.dev), aen_group);
 }
 
 static struct device_attribute pmcraid_adapter_id_attr = {
     .attr = {
          .name = "adapter_id",
          .mode = S_IRUGO,
          },
     .show = pmcraid_show_adapter_id,
 };
 
 static struct attribute *pmcraid_host_attrs[] = {
     &pmcraid_log_level_attr.attr,
     &pmcraid_driver_version_attr.attr,
     &pmcraid_adapter_id_attr.attr,
     NULL,
 };
 
 ATTRIBUTE_GROUPS(pmcraid_host);
 
 /* host template structure for pmcraid driver */
 static struct scsi_host_template pmcraid_host_template = {
     .module = THIS_MODULE,
     .name = PMCRAID_DRIVER_NAME,
     .queuecommand = pmcraid_queuecommand,
     .eh_abort_handler = pmcraid_eh_abort_handler,
     .eh_bus_reset_handler = pmcraid_eh_bus_reset_handler,
     .eh_target_reset_handler = pmcraid_eh_target_reset_handler,
     .eh_device_reset_handler = pmcraid_eh_device_reset_handler,
     .eh_host_reset_handler = pmcraid_eh_host_reset_handler,
 
     .slave_alloc = pmcraid_slave_alloc,
     .slave_configure = pmcraid_slave_configure,
     .slave_destroy = pmcraid_slave_destroy,
     .change_queue_depth = pmcraid_change_queue_depth,
     .can_queue = PMCRAID_MAX_IO_CMD,
     .this_id = -1,
     .sg_tablesize = PMCRAID_MAX_IOADLS,
     .max_sectors = PMCRAID_IOA_MAX_SECTORS,
     .no_write_same = 1,
     .cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN,
     .shost_groups = pmcraid_host_groups,
     .proc_name = PMCRAID_DRIVER_NAME,
 };
 
 /*
  * pmcraid_isr_msix - implements MSI-X interrupt handling routine
  * @irq: interrupt vector number
  * @dev_id: pointer hrrq_vector
  *
  * Return Value
  *   IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
  */
 
 static irqreturn_t pmcraid_isr_msix(int irq, void *dev_id)
 {
     struct pmcraid_isr_param *hrrq_vector;
     struct pmcraid_instance *pinstance;
     unsigned long lock_flags;
     u32 intrs_val;
     int hrrq_id;
 
     hrrq_vector = (struct pmcraid_isr_param *)dev_id;
     hrrq_id = hrrq_vector->hrrq_id;
     pinstance = hrrq_vector->drv_inst;
 
     if (!hrrq_id) {
         /* Read the interrupt */
         intrs_val = pmcraid_read_interrupts(pinstance);
         if (intrs_val &&
             ((ioread32(pinstance->int_regs.host_ioa_interrupt_reg)
             & DOORBELL_INTR_MSIX_CLR) == 0)) {
             /* Any error interrupts including unit_check,
              * initiate IOA reset.In case of unit check indicate
              * to reset_sequence that IOA unit checked and prepare
              * for a dump during reset sequence
              */
             if (intrs_val & PMCRAID_ERROR_INTERRUPTS) {
                 if (intrs_val & INTRS_IOA_UNIT_CHECK)
                     pinstance->ioa_unit_check = 1;
 
                 pmcraid_err("ISR: error interrupts: %x \
                     initiating reset\n", intrs_val);
                 spin_lock_irqsave(pinstance->host->host_lock,
                     lock_flags);
                 pmcraid_initiate_reset(pinstance);
                 spin_unlock_irqrestore(
                     pinstance->host->host_lock,
                     lock_flags);
             }
             /* If interrupt was as part of the ioa initialization,
              * clear it. Delete the timer and wakeup the
              * reset engine to proceed with reset sequence
              */
             if (intrs_val & INTRS_TRANSITION_TO_OPERATIONAL)
                 pmcraid_clr_trans_op(pinstance);
 
             /* Clear the interrupt register by writing
              * to host to ioa doorbell. Once done
              * FW will clear the interrupt.
              */
             iowrite32(DOORBELL_INTR_MSIX_CLR,
                 pinstance->int_regs.host_ioa_interrupt_reg);
             ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
 
 
         }
     }
 
     tasklet_schedule(&(pinstance->isr_tasklet[hrrq_id]));
 
     return IRQ_HANDLED;
 }
 
 /**
  * pmcraid_isr  - implements legacy interrupt handling routine
  *
  * @irq: interrupt vector number
  * @dev_id: pointer hrrq_vector
  *
  * Return Value
  *   IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
  */
 static irqreturn_t pmcraid_isr(int irq, void *dev_id)
 {
     struct pmcraid_isr_param *hrrq_vector;
     struct pmcraid_instance *pinstance;
     u32 intrs;
     unsigned long lock_flags;
     int hrrq_id = 0;
 
     /* In case of legacy interrupt mode where interrupts are shared across
      * isrs, it may be possible that the current interrupt is not from IOA
      */
     if (!dev_id) {
         printk(KERN_INFO "%s(): NULL host pointer\n", __func__);
         return IRQ_NONE;
     }
     hrrq_vector = (struct pmcraid_isr_param *)dev_id;
     pinstance = hrrq_vector->drv_inst;
 
     intrs = pmcraid_read_interrupts(pinstance);
 
     if (unlikely((intrs & PMCRAID_PCI_INTERRUPTS) == 0))
         return IRQ_NONE;
 
     /* Any error interrupts including unit_check, initiate IOA reset.
      * In case of unit check indicate to reset_sequence that IOA unit
      * checked and prepare for a dump during reset sequence
      */
     if (intrs & PMCRAID_ERROR_INTERRUPTS) {
 
         if (intrs & INTRS_IOA_UNIT_CHECK)
             pinstance->ioa_unit_check = 1;
 
         iowrite32(intrs,
               pinstance->int_regs.ioa_host_interrupt_clr_reg);
         pmcraid_err("ISR: error interrupts: %x initiating reset\n",
                 intrs);
         intrs = ioread32(
                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
         pmcraid_initiate_reset(pinstance);
         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
     } else {
         /* If interrupt was as part of the ioa initialization,
          * clear. Delete the timer and wakeup the
          * reset engine to proceed with reset sequence
          */
         if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
             pmcraid_clr_trans_op(pinstance);
         } else {
             iowrite32(intrs,
                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
             ioread32(
                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
 
             tasklet_schedule(
                     &(pinstance->isr_tasklet[hrrq_id]));
         }
     }
 
     return IRQ_HANDLED;
 }
 
 
 /**
  * pmcraid_worker_function -  worker thread function
  *
  * @workp: pointer to struct work queue
  *
  * Return Value
  *   None
  */
 
 static void pmcraid_worker_function(struct work_struct *workp)
 {
     struct pmcraid_instance *pinstance;
     struct pmcraid_resource_entry *res;
     struct pmcraid_resource_entry *temp;
     struct scsi_device *sdev;
     unsigned long lock_flags;
     unsigned long host_lock_flags;
     u16 fw_version;
     u8 bus, target, lun;
 
     pinstance = container_of(workp, struct pmcraid_instance, worker_q);
     /* add resources only after host is added into system */
     if (!atomic_read(&pinstance->expose_resources))
         return;
 
     fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
 
     spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
     list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) {
 
         if (res->change_detected == RES_CHANGE_DEL && res->scsi_dev) {
             sdev = res->scsi_dev;
 
             /* host_lock must be held before calling
              * scsi_device_get
              */
             spin_lock_irqsave(pinstance->host->host_lock,
                       host_lock_flags);
             if (!scsi_device_get(sdev)) {
                 spin_unlock_irqrestore(
                         pinstance->host->host_lock,
                         host_lock_flags);
                 pmcraid_info("deleting %x from midlayer\n",
                          res->cfg_entry.resource_address);
                 list_move_tail(&res->queue,
                         &pinstance->free_res_q);
                 spin_unlock_irqrestore(
                     &pinstance->resource_lock,
                     lock_flags);
                 scsi_remove_device(sdev);
                 scsi_device_put(sdev);
                 spin_lock_irqsave(&pinstance->resource_lock,
                            lock_flags);
                 res->change_detected = 0;
             } else {
                 spin_unlock_irqrestore(
                         pinstance->host->host_lock,
                         host_lock_flags);
             }
         }
     }
 
     list_for_each_entry(res, &pinstance->used_res_q, queue) {
 
         if (res->change_detected == RES_CHANGE_ADD) {
 
             if (!pmcraid_expose_resource(fw_version,
                              &res->cfg_entry))
                 continue;
 
             if (RES_IS_VSET(res->cfg_entry)) {
                 bus = PMCRAID_VSET_BUS_ID;
                 if (fw_version <= PMCRAID_FW_VERSION_1)
                     target = res->cfg_entry.unique_flags1;
                 else
                     target = le16_to_cpu(res->cfg_entry.array_id) & 0xFF;
                 lun = PMCRAID_VSET_LUN_ID;
             } else {
                 bus = PMCRAID_PHYS_BUS_ID;
                 target =
                      RES_TARGET(
                     res->cfg_entry.resource_address);
                 lun = RES_LUN(res->cfg_entry.resource_address);
             }
 
             res->change_detected = 0;
             spin_unlock_irqrestore(&pinstance->resource_lock,
                         lock_flags);
             scsi_add_device(pinstance->host, bus, target, lun);
             spin_lock_irqsave(&pinstance->resource_lock,
                        lock_flags);
         }
     }
 
     spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
 }
 
 /**
  * pmcraid_tasklet_function - Tasklet function
  *
  * @instance: pointer to msix param structure
  *
  * Return Value
  *  None
  */
 static void pmcraid_tasklet_function(unsigned long instance)
 {
     struct pmcraid_isr_param *hrrq_vector;
     struct pmcraid_instance *pinstance;
     unsigned long hrrq_lock_flags;
     unsigned long pending_lock_flags;
     unsigned long host_lock_flags;
     spinlock_t *lockp; /* hrrq buffer lock */
     int id;
     u32 resp;
 
     hrrq_vector = (struct pmcraid_isr_param *)instance;
     pinstance = hrrq_vector->drv_inst;
     id = hrrq_vector->hrrq_id;
     lockp = &(pinstance->hrrq_lock[id]);
 
     /* loop through each of the commands responded by IOA. Each HRRQ buf is
      * protected by its own lock. Traversals must be done within this lock
      * as there may be multiple tasklets running on multiple CPUs. Note
      * that the lock is held just for picking up the response handle and
      * manipulating hrrq_curr/toggle_bit values.
      */
     spin_lock_irqsave(lockp, hrrq_lock_flags);
 
     resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
 
     while ((resp & HRRQ_TOGGLE_BIT) ==
         pinstance->host_toggle_bit[id]) {
 
         int cmd_index = resp >> 2;
         struct pmcraid_cmd *cmd = NULL;
 
         if (pinstance->hrrq_curr[id] < pinstance->hrrq_end[id]) {
             pinstance->hrrq_curr[id]++;
         } else {
             pinstance->hrrq_curr[id] = pinstance->hrrq_start[id];
             pinstance->host_toggle_bit[id] ^= 1u;
         }
 
         if (cmd_index >= PMCRAID_MAX_CMD) {
             /* In case of invalid response handle, log message */
             pmcraid_err("Invalid response handle %d\n", cmd_index);
             resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
             continue;
         }
 
         cmd = pinstance->cmd_list[cmd_index];
         spin_unlock_irqrestore(lockp, hrrq_lock_flags);
 
         spin_lock_irqsave(&pinstance->pending_pool_lock,
                    pending_lock_flags);
         list_del(&cmd->free_list);
         spin_unlock_irqrestore(&pinstance->pending_pool_lock,
                     pending_lock_flags);
         del_timer(&cmd->timer);
         atomic_dec(&pinstance->outstanding_cmds);
 
         if (cmd->cmd_done == pmcraid_ioa_reset) {
             spin_lock_irqsave(pinstance->host->host_lock,
                       host_lock_flags);
             cmd->cmd_done(cmd);
             spin_unlock_irqrestore(pinstance->host->host_lock,
                            host_lock_flags);
         } else if (cmd->cmd_done != NULL) {
             cmd->cmd_done(cmd);
         }
         /* loop over until we are done with all responses */
         spin_lock_irqsave(lockp, hrrq_lock_flags);
         resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
     }
 
     spin_unlock_irqrestore(lockp, hrrq_lock_flags);
 }
 
 /**
  * pmcraid_unregister_interrupt_handler - de-register interrupts handlers
  * @pinstance: pointer to adapter instance structure
  *
  * This routine un-registers registered interrupt handler and
  * also frees irqs/vectors.
  *
  * Retun Value
  *  None
  */
 static
 void pmcraid_unregister_interrupt_handler(struct pmcraid_instance *pinstance)
 {
     struct pci_dev *pdev = pinstance->pdev;
     int i;
 
     for (i = 0; i < pinstance->num_hrrq; i++)
         free_irq(pci_irq_vector(pdev, i), &pinstance->hrrq_vector[i]);
 
     pinstance->interrupt_mode = 0;
     pci_free_irq_vectors(pdev);
 }
 
 /**
  * pmcraid_register_interrupt_handler - registers interrupt handler
  * @pinstance: pointer to per-adapter instance structure
  *
  * Return Value
  *  0 on success, non-zero error code otherwise.
  */
 static int
 pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance)
 {
     struct pci_dev *pdev = pinstance->pdev;
     unsigned int irq_flag = PCI_IRQ_LEGACY, flag;
     int num_hrrq, rc, i;
     irq_handler_t isr;
 
     if (pmcraid_enable_msix)
         irq_flag |= PCI_IRQ_MSIX;
 
     num_hrrq = pci_alloc_irq_vectors(pdev, 1, PMCRAID_NUM_MSIX_VECTORS,
             irq_flag);
     if (num_hrrq < 0)
         return num_hrrq;
 
     if (pdev->msix_enabled) {
         flag = 0;
         isr = pmcraid_isr_msix;
     } else {
         flag = IRQF_SHARED;
         isr = pmcraid_isr;
     }
 
     for (i = 0; i < num_hrrq; i++) {
         struct pmcraid_isr_param *vec = &pinstance->hrrq_vector[i];
 
         vec->hrrq_id = i;
         vec->drv_inst = pinstance;
         rc = request_irq(pci_irq_vector(pdev, i), isr, flag,
                 PMCRAID_DRIVER_NAME, vec);
         if (rc)
             goto out_unwind;
     }
 
     pinstance->num_hrrq = num_hrrq;
     if (pdev->msix_enabled) {
         pinstance->interrupt_mode = 1;
         iowrite32(DOORBELL_INTR_MODE_MSIX,
               pinstance->int_regs.host_ioa_interrupt_reg);
         ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
     }
 
     return 0;
 
 out_unwind:
     while (--i >= 0)
         free_irq(pci_irq_vector(pdev, i), &pinstance->hrrq_vector[i]);
     pci_free_irq_vectors(pdev);
     return rc;
 }
 
 /**
  * pmcraid_release_cmd_blocks - release buufers allocated for command blocks
  * @pinstance: per adapter instance structure pointer
  * @max_index: number of buffer blocks to release
  *
  * Return Value
  *  None
  */
 static void
 pmcraid_release_cmd_blocks(struct pmcraid_instance *pinstance, int max_index)
 {
     int i;
     for (i = 0; i < max_index; i++) {
         kmem_cache_free(pinstance->cmd_cachep, pinstance->cmd_list[i]);
         pinstance->cmd_list[i] = NULL;
     }
     kmem_cache_destroy(pinstance->cmd_cachep);
     pinstance->cmd_cachep = NULL;
 }
 
 /**
  * pmcraid_release_control_blocks - releases buffers alloced for control blocks
  * @pinstance: pointer to per adapter instance structure
  * @max_index: number of buffers (from 0 onwards) to release
  *
  * This function assumes that the command blocks for which control blocks are
  * linked are not released.
  *
  * Return Value
  *   None
  */
 static void
 pmcraid_release_control_blocks(
     struct pmcraid_instance *pinstance,
     int max_index
 )
 {
     int i;
 
     if (pinstance->control_pool == NULL)
         return;
 
     for (i = 0; i < max_index; i++) {
         dma_pool_free(pinstance->control_pool,
                   pinstance->cmd_list[i]->ioa_cb,
                   pinstance->cmd_list[i]->ioa_cb_bus_addr);
         pinstance->cmd_list[i]->ioa_cb = NULL;
         pinstance->cmd_list[i]->ioa_cb_bus_addr = 0;
     }
     dma_pool_destroy(pinstance->control_pool);
     pinstance->control_pool = NULL;
 }
 
 /**
  * pmcraid_allocate_cmd_blocks - allocate memory for cmd block structures
  * @pinstance: pointer to per adapter instance structure
  *
  * Allocates memory for command blocks using kernel slab allocator.
  *
  * Return Value
  *  0 in case of success; -ENOMEM in case of failure
  */
 static int pmcraid_allocate_cmd_blocks(struct pmcraid_instance *pinstance)
 {
     int i;
 
     sprintf(pinstance->cmd_pool_name, "pmcraid_cmd_pool_%d",
         pinstance->host->unique_id);
 
 
     pinstance->cmd_cachep = kmem_cache_create(
                     pinstance->cmd_pool_name,
                     sizeof(struct pmcraid_cmd), 0,
                     SLAB_HWCACHE_ALIGN, NULL);
     if (!pinstance->cmd_cachep)
         return -ENOMEM;
 
     for (i = 0; i < PMCRAID_MAX_CMD; i++) {
         pinstance->cmd_list[i] =
             kmem_cache_alloc(pinstance->cmd_cachep, GFP_KERNEL);
         if (!pinstance->cmd_list[i]) {
             pmcraid_release_cmd_blocks(pinstance, i);
             return -ENOMEM;
         }
     }
     return 0;
 }
 
 /**
  * pmcraid_allocate_control_blocks - allocates memory control blocks
  * @pinstance : pointer to per adapter instance structure
  *
  * This function allocates PCI memory for DMAable buffers like IOARCB, IOADLs
  * and IOASAs. This is called after command blocks are already allocated.
  *
  * Return Value
  *  0 in case it can allocate all control blocks, otherwise -ENOMEM
  */
 static int pmcraid_allocate_control_blocks(struct pmcraid_instance *pinstance)
 {
     int i;
 
     sprintf(pinstance->ctl_pool_name, "pmcraid_control_pool_%d",
         pinstance->host->unique_id);
 
     pinstance->control_pool =
         dma_pool_create(pinstance->ctl_pool_name,
                 &pinstance->pdev->dev,
                 sizeof(struct pmcraid_control_block),
                 PMCRAID_IOARCB_ALIGNMENT, 0);
 
     if (!pinstance->control_pool)
         return -ENOMEM;
 
     for (i = 0; i < PMCRAID_MAX_CMD; i++) {
         pinstance->cmd_list[i]->ioa_cb =
             dma_pool_zalloc(
                 pinstance->control_pool,
                 GFP_KERNEL,
                 &(pinstance->cmd_list[i]->ioa_cb_bus_addr));
 
         if (!pinstance->cmd_list[i]->ioa_cb) {
             pmcraid_release_control_blocks(pinstance, i);
             return -ENOMEM;
         }
     }
     return 0;
 }
 
 /**
  * pmcraid_release_host_rrqs - release memory allocated for hrrq buffer(s)
  * @pinstance: pointer to per adapter instance structure
  * @maxindex: size of hrrq buffer pointer array
  *
  * Return Value
  *  None
  */
 static void
 pmcraid_release_host_rrqs(struct pmcraid_instance *pinstance, int maxindex)
 {
     int i;
 
     for (i = 0; i < maxindex; i++) {
         dma_free_coherent(&pinstance->pdev->dev,
                     HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD,
                     pinstance->hrrq_start[i],
                     pinstance->hrrq_start_bus_addr[i]);
 
         /* reset pointers and toggle bit to zeros */
         pinstance->hrrq_start[i] = NULL;
         pinstance->hrrq_start_bus_addr[i] = 0;
         pinstance->host_toggle_bit[i] = 0;
     }
 }
 
 /**
  * pmcraid_allocate_host_rrqs - Allocate and initialize host RRQ buffers
  * @pinstance: pointer to per adapter instance structure
  *
  * Return value
  *  0 hrrq buffers are allocated, -ENOMEM otherwise.
  */
 static int pmcraid_allocate_host_rrqs(struct pmcraid_instance *pinstance)
 {
     int i, buffer_size;
 
     buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
 
     for (i = 0; i < pinstance->num_hrrq; i++) {
         pinstance->hrrq_start[i] =
             dma_alloc_coherent(&pinstance->pdev->dev, buffer_size,
                        &pinstance->hrrq_start_bus_addr[i],
                        GFP_KERNEL);
         if (!pinstance->hrrq_start[i]) {
             pmcraid_err("pci_alloc failed for hrrq vector : %d\n",
                     i);
             pmcraid_release_host_rrqs(pinstance, i);
             return -ENOMEM;
         }
 
         pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
         pinstance->hrrq_end[i] =
             pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
         pinstance->host_toggle_bit[i] = 1;
         spin_lock_init(&pinstance->hrrq_lock[i]);
     }
     return 0;
 }
 
 /**
  * pmcraid_release_hcams - release HCAM buffers
  *
  * @pinstance: pointer to per adapter instance structure
  *
  * Return value
  *  none
  */
 static void pmcraid_release_hcams(struct pmcraid_instance *pinstance)
 {
     if (pinstance->ccn.msg != NULL) {
         dma_free_coherent(&pinstance->pdev->dev,
                     PMCRAID_AEN_HDR_SIZE +
                     sizeof(struct pmcraid_hcam_ccn_ext),
                     pinstance->ccn.msg,
                     pinstance->ccn.baddr);
 
         pinstance->ccn.msg = NULL;
         pinstance->ccn.hcam = NULL;
         pinstance->ccn.baddr = 0;
     }
 
     if (pinstance->ldn.msg != NULL) {
         dma_free_coherent(&pinstance->pdev->dev,
                     PMCRAID_AEN_HDR_SIZE +
                     sizeof(struct pmcraid_hcam_ldn),
                     pinstance->ldn.msg,
                     pinstance->ldn.baddr);
 
         pinstance->ldn.msg = NULL;
         pinstance->ldn.hcam = NULL;
         pinstance->ldn.baddr = 0;
     }
 }
 
 /**
  * pmcraid_allocate_hcams - allocates HCAM buffers
  * @pinstance : pointer to per adapter instance structure
  *
  * Return Value:
  *   0 in case of successful allocation, non-zero otherwise
  */
 static int pmcraid_allocate_hcams(struct pmcraid_instance *pinstance)
 {
     pinstance->ccn.msg = dma_alloc_coherent(&pinstance->pdev->dev,
                     PMCRAID_AEN_HDR_SIZE +
                     sizeof(struct pmcraid_hcam_ccn_ext),
                     &pinstance->ccn.baddr, GFP_KERNEL);
 
     pinstance->ldn.msg = dma_alloc_coherent(&pinstance->pdev->dev,
                     PMCRAID_AEN_HDR_SIZE +
                     sizeof(struct pmcraid_hcam_ldn),
                     &pinstance->ldn.baddr, GFP_KERNEL);
 
     if (pinstance->ldn.msg == NULL || pinstance->ccn.msg == NULL) {
         pmcraid_release_hcams(pinstance);
     } else {
         pinstance->ccn.hcam =
             (void *)pinstance->ccn.msg + PMCRAID_AEN_HDR_SIZE;
         pinstance->ldn.hcam =
             (void *)pinstance->ldn.msg + PMCRAID_AEN_HDR_SIZE;
 
         atomic_set(&pinstance->ccn.ignore, 0);
         atomic_set(&pinstance->ldn.ignore, 0);
     }
 
     return (pinstance->ldn.msg == NULL) ? -ENOMEM : 0;
 }
 
 /**
  * pmcraid_release_config_buffers - release config.table buffers
  * @pinstance: pointer to per adapter instance structure
  *
  * Return Value
  *   none
  */
 static void pmcraid_release_config_buffers(struct pmcraid_instance *pinstance)
 {
     if (pinstance->cfg_table != NULL &&
         pinstance->cfg_table_bus_addr != 0) {
         dma_free_coherent(&pinstance->pdev->dev,
                     sizeof(struct pmcraid_config_table),
                     pinstance->cfg_table,
                     pinstance->cfg_table_bus_addr);
         pinstance->cfg_table = NULL;
         pinstance->cfg_table_bus_addr = 0;
     }
 
     if (pinstance->res_entries != NULL) {
         int i;
 
         for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
             list_del(&pinstance->res_entries[i].queue);
         kfree(pinstance->res_entries);
         pinstance->res_entries = NULL;
     }
 
     pmcraid_release_hcams(pinstance);
 }
 
 /**
  * pmcraid_allocate_config_buffers - allocates DMAable memory for config table
  * @pinstance : pointer to per adapter instance structure
  *
  * Return Value
  *  0 for successful allocation, -ENOMEM for any failure
  */
 static int pmcraid_allocate_config_buffers(struct pmcraid_instance *pinstance)
 {
     int i;
 
     pinstance->res_entries =
             kcalloc(PMCRAID_MAX_RESOURCES,
                 sizeof(struct pmcraid_resource_entry),
                 GFP_KERNEL);
 
     if (NULL == pinstance->res_entries) {
         pmcraid_err("failed to allocate memory for resource table\n");
         return -ENOMEM;
     }
 
     for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
         list_add_tail(&pinstance->res_entries[i].queue,
                   &pinstance->free_res_q);
 
     pinstance->cfg_table = dma_alloc_coherent(&pinstance->pdev->dev,
                      sizeof(struct pmcraid_config_table),
                      &pinstance->cfg_table_bus_addr,
                      GFP_KERNEL);
 
     if (NULL == pinstance->cfg_table) {
         pmcraid_err("couldn't alloc DMA memory for config table\n");
         pmcraid_release_config_buffers(pinstance);
         return -ENOMEM;
     }
 
     if (pmcraid_allocate_hcams(pinstance)) {
         pmcraid_err("could not alloc DMA memory for HCAMS\n");
         pmcraid_release_config_buffers(pinstance);
         return -ENOMEM;
     }
 
     return 0;
 }
 
 /**
  * pmcraid_init_tasklets - registers tasklets for response handling
  *
  * @pinstance: pointer adapter instance structure
  *
  * Return value
  *  none
  */
 static void pmcraid_init_tasklets(struct pmcraid_instance *pinstance)
 {
     int i;
     for (i = 0; i < pinstance->num_hrrq; i++)
         tasklet_init(&pinstance->isr_tasklet[i],
                  pmcraid_tasklet_function,
                  (unsigned long)&pinstance->hrrq_vector[i]);
 }
 
 /**
  * pmcraid_kill_tasklets - destroys tasklets registered for response handling
  *
  * @pinstance: pointer to adapter instance structure
  *
  * Return value
  *  none
  */
 static void pmcraid_kill_tasklets(struct pmcraid_instance *pinstance)
 {
     int i;
     for (i = 0; i < pinstance->num_hrrq; i++)
         tasklet_kill(&pinstance->isr_tasklet[i]);
 }
 
 /**
  * pmcraid_release_buffers - release per-adapter buffers allocated
  *
  * @pinstance: pointer to adapter soft state
  *
  * Return Value
  *  none
  */
 static void pmcraid_release_buffers(struct pmcraid_instance *pinstance)
 {
     pmcraid_release_config_buffers(pinstance);
     pmcraid_release_control_blocks(pinstance, PMCRAID_MAX_CMD);
     pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
     pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
 
     if (pinstance->inq_data != NULL) {
         dma_free_coherent(&pinstance->pdev->dev,
                     sizeof(struct pmcraid_inquiry_data),
                     pinstance->inq_data,
                     pinstance->inq_data_baddr);
 
         pinstance->inq_data = NULL;
         pinstance->inq_data_baddr = 0;
     }
 
     if (pinstance->timestamp_data != NULL) {
         dma_free_coherent(&pinstance->pdev->dev,
                     sizeof(struct pmcraid_timestamp_data),
                     pinstance->timestamp_data,
                     pinstance->timestamp_data_baddr);
 
         pinstance->timestamp_data = NULL;
         pinstance->timestamp_data_baddr = 0;
     }
 }
 
 /**
  * pmcraid_init_buffers - allocates memory and initializes various structures
  * @pinstance: pointer to per adapter instance structure
  *
  * This routine pre-allocates memory based on the type of block as below:
  * cmdblocks(PMCRAID_MAX_CMD): kernel memory using kernel's slab_allocator,
  * IOARCBs(PMCRAID_MAX_CMD)  : DMAable memory, using pci pool allocator
  * config-table entries      : DMAable memory using dma_alloc_coherent
  * HostRRQs                  : DMAable memory, using dma_alloc_coherent
  *
  * Return Value
  *   0 in case all of the blocks are allocated, -ENOMEM otherwise.
  */
 static int pmcraid_init_buffers(struct pmcraid_instance *pinstance)
 {
     int i;
 
     if (pmcraid_allocate_host_rrqs(pinstance)) {
         pmcraid_err("couldn't allocate memory for %d host rrqs\n",
                  pinstance->num_hrrq);
         return -ENOMEM;
     }
 
     if (pmcraid_allocate_config_buffers(pinstance)) {
         pmcraid_err("couldn't allocate memory for config buffers\n");
         pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
         return -ENOMEM;
     }
 
     if (pmcraid_allocate_cmd_blocks(pinstance)) {
         pmcraid_err("couldn't allocate memory for cmd blocks\n");
         pmcraid_release_config_buffers(pinstance);
         pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
         return -ENOMEM;
     }
 
     if (pmcraid_allocate_control_blocks(pinstance)) {
         pmcraid_err("couldn't allocate memory control blocks\n");
         pmcraid_release_config_buffers(pinstance);
         pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
         pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
         return -ENOMEM;
     }
 
     /* allocate DMAable memory for page D0 INQUIRY buffer */
     pinstance->inq_data = dma_alloc_coherent(&pinstance->pdev->dev,
                     sizeof(struct pmcraid_inquiry_data),
                     &pinstance->inq_data_baddr, GFP_KERNEL);
     if (pinstance->inq_data == NULL) {
         pmcraid_err("couldn't allocate DMA memory for INQUIRY\n");
         pmcraid_release_buffers(pinstance);
         return -ENOMEM;
     }
 
     /* allocate DMAable memory for set timestamp data buffer */
     pinstance->timestamp_data = dma_alloc_coherent(&pinstance->pdev->dev,
                     sizeof(struct pmcraid_timestamp_data),
                     &pinstance->timestamp_data_baddr,
                     GFP_KERNEL);
     if (pinstance->timestamp_data == NULL) {
         pmcraid_err("couldn't allocate DMA memory for \
                 set time_stamp \n");
         pmcraid_release_buffers(pinstance);
         return -ENOMEM;
     }
 
 
     /* Initialize all the command blocks and add them to free pool. No
      * need to lock (free_pool_lock) as this is done in initialization
      * itself
      */
     for (i = 0; i < PMCRAID_MAX_CMD; i++) {
         struct pmcraid_cmd *cmdp = pinstance->cmd_list[i];
         pmcraid_init_cmdblk(cmdp, i);
         cmdp->drv_inst = pinstance;
         list_add_tail(&cmdp->free_list, &pinstance->free_cmd_pool);
     }
 
     return 0;
 }
 
 /**
  * pmcraid_reinit_buffers - resets various buffer pointers
  * @pinstance: pointer to adapter instance
  * Return value
  *  none
  */
 static void pmcraid_reinit_buffers(struct pmcraid_instance *pinstance)
 {
     int i;
     int buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
 
     for (i = 0; i < pinstance->num_hrrq; i++) {
         memset(pinstance->hrrq_start[i], 0, buffer_size);
         pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
         pinstance->hrrq_end[i] =
             pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
         pinstance->host_toggle_bit[i] = 1;
     }
 }
 
 /**
  * pmcraid_init_instance - initialize per instance data structure
  * @pdev: pointer to pci device structure
  * @host: pointer to Scsi_Host structure
  * @mapped_pci_addr: memory mapped IOA configuration registers
  *
  * Return Value
  *   0 on success, non-zero in case of any failure
  */
 static int pmcraid_init_instance(struct pci_dev *pdev, struct Scsi_Host *host,
                  void __iomem *mapped_pci_addr)
 {
     struct pmcraid_instance *pinstance =
         (struct pmcraid_instance *)host->hostdata;
 
     pinstance->host = host;
     pinstance->pdev = pdev;
 
     /* Initialize register addresses */
     pinstance->mapped_dma_addr = mapped_pci_addr;
 
     /* Initialize chip-specific details */
     {
         struct pmcraid_chip_details *chip_cfg = pinstance->chip_cfg;
         struct pmcraid_interrupts *pint_regs = &pinstance->int_regs;
 
         pinstance->ioarrin = mapped_pci_addr + chip_cfg->ioarrin;
 
         pint_regs->ioa_host_interrupt_reg =
             mapped_pci_addr + chip_cfg->ioa_host_intr;
         pint_regs->ioa_host_interrupt_clr_reg =
             mapped_pci_addr + chip_cfg->ioa_host_intr_clr;
         pint_regs->ioa_host_msix_interrupt_reg =
             mapped_pci_addr + chip_cfg->ioa_host_msix_intr;
         pint_regs->host_ioa_interrupt_reg =
             mapped_pci_addr + chip_cfg->host_ioa_intr;
         pint_regs->host_ioa_interrupt_clr_reg =
             mapped_pci_addr + chip_cfg->host_ioa_intr_clr;
 
         /* Current version of firmware exposes interrupt mask set
          * and mask clr registers through memory mapped bar0.
          */
         pinstance->mailbox = mapped_pci_addr + chip_cfg->mailbox;
         pinstance->ioa_status = mapped_pci_addr + chip_cfg->ioastatus;
         pint_regs->ioa_host_interrupt_mask_reg =
             mapped_pci_addr + chip_cfg->ioa_host_mask;
         pint_regs->ioa_host_interrupt_mask_clr_reg =
             mapped_pci_addr + chip_cfg->ioa_host_mask_clr;
         pint_regs->global_interrupt_mask_reg =
             mapped_pci_addr + chip_cfg->global_intr_mask;
     }
 
     pinstance->ioa_reset_attempts = 0;
     init_waitqueue_head(&pinstance->reset_wait_q);
 
     atomic_set(&pinstance->outstanding_cmds, 0);
     atomic_set(&pinstance->last_message_id, 0);
     atomic_set(&pinstance->expose_resources, 0);
 
     INIT_LIST_HEAD(&pinstance->free_res_q);
     INIT_LIST_HEAD(&pinstance->used_res_q);
     INIT_LIST_HEAD(&pinstance->free_cmd_pool);
     INIT_LIST_HEAD(&pinstance->pending_cmd_pool);
 
     spin_lock_init(&pinstance->free_pool_lock);
     spin_lock_init(&pinstance->pending_pool_lock);
     spin_lock_init(&pinstance->resource_lock);
     mutex_init(&pinstance->aen_queue_lock);
 
     /* Work-queue (Shared) for deferred processing error handling */
     INIT_WORK(&pinstance->worker_q, pmcraid_worker_function);
 
     /* Initialize the default log_level */
     pinstance->current_log_level = pmcraid_log_level;
 
     /* Setup variables required for reset engine */
     pinstance->ioa_state = IOA_STATE_UNKNOWN;
     pinstance->reset_cmd = NULL;
     return 0;
 }
 
 /**
  * pmcraid_shutdown - shutdown adapter controller.
  * @pdev: pci device struct
  *
  * Issues an adapter shutdown to the card waits for its completion
  *
  * Return value
  *    none
  */
 static void pmcraid_shutdown(struct pci_dev *pdev)
 {
     struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
     pmcraid_reset_bringdown(pinstance);
 }
 
 
 /*
  * pmcraid_get_minor - returns unused minor number from minor number bitmap
  */
 static unsigned short pmcraid_get_minor(void)
 {
     int minor;
 
     minor = find_first_zero_bit(pmcraid_minor, PMCRAID_MAX_ADAPTERS);
     __set_bit(minor, pmcraid_minor);
     return minor;
 }
 
 /*
  * pmcraid_release_minor - releases given minor back to minor number bitmap
  */
 static void pmcraid_release_minor(unsigned short minor)
 {
     __clear_bit(minor, pmcraid_minor);
 }
 
 /**
  * pmcraid_setup_chrdev - allocates a minor number and registers a char device
  *
  * @pinstance: pointer to adapter instance for which to register device
  *
  * Return value
  *  0 in case of success, otherwise non-zero
  */
 static int pmcraid_setup_chrdev(struct pmcraid_instance *pinstance)
 {
     int minor;
     int error;
 
     minor = pmcraid_get_minor();
     cdev_init(&pinstance->cdev, &pmcraid_fops);
     pinstance->cdev.owner = THIS_MODULE;
 
     error = cdev_add(&pinstance->cdev, MKDEV(pmcraid_major, minor), 1);
 
     if (error)
         pmcraid_release_minor(minor);
     else
         device_create(pmcraid_class, NULL, MKDEV(pmcraid_major, minor),
                   NULL, "%s%u", PMCRAID_DEVFILE, minor);
     return error;
 }
 
 /**
  * pmcraid_release_chrdev - unregisters per-adapter management interface
  *
  * @pinstance: pointer to adapter instance structure
  *
  * Return value
  *  none
  */
 static void pmcraid_release_chrdev(struct pmcraid_instance *pinstance)
 {
     pmcraid_release_minor(MINOR(pinstance->cdev.dev));
     device_destroy(pmcraid_class,
                MKDEV(pmcraid_major, MINOR(pinstance->cdev.dev)));
     cdev_del(&pinstance->cdev);
 }
 
 /**
  * pmcraid_remove - IOA hot plug remove entry point
  * @pdev: pci device struct
  *
  * Return value
  *    none
  */
 static void pmcraid_remove(struct pci_dev *pdev)
 {
     struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
 
     /* remove the management interface (/dev file) for this device */
     pmcraid_release_chrdev(pinstance);
 
     /* remove host template from scsi midlayer */
     scsi_remove_host(pinstance->host);
 
     /* block requests from mid-layer */
     scsi_block_requests(pinstance->host);
 
     /* initiate shutdown adapter */
     pmcraid_shutdown(pdev);
 
     pmcraid_disable_interrupts(pinstance, ~0);
     flush_work(&pinstance->worker_q);
 
     pmcraid_kill_tasklets(pinstance);
     pmcraid_unregister_interrupt_handler(pinstance);
     pmcraid_release_buffers(pinstance);
     iounmap(pinstance->mapped_dma_addr);
     pci_release_regions(pdev);
     scsi_host_put(pinstance->host);
     pci_disable_device(pdev);
 
     return;
 }
 
 /**
  * pmcraid_suspend - driver suspend entry point for power management
  * @dev:   Device structure
  *
  * Return Value - 0 always
  */
 static int __maybe_unused pmcraid_suspend(struct device *dev)
 {
     struct pci_dev *pdev = to_pci_dev(dev);
     struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
 
     pmcraid_shutdown(pdev);
     pmcraid_disable_interrupts(pinstance, ~0);
     pmcraid_kill_tasklets(pinstance);
     pmcraid_unregister_interrupt_handler(pinstance);
 
     return 0;
 }
 
 /**
  * pmcraid_resume - driver resume entry point PCI power management
  * @dev: Device structure
  *
  * Return Value - 0 in case of success. Error code in case of any failure
  */
 static int __maybe_unused pmcraid_resume(struct device *dev)
 {
     struct pci_dev *pdev = to_pci_dev(dev);
     struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
     struct Scsi_Host *host = pinstance->host;
     int rc = 0;
 
     if (sizeof(dma_addr_t) == 4 ||
         dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)))
         rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 
     if (rc == 0)
         rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 
     if (rc != 0) {
         dev_err(&pdev->dev, "resume: Failed to set PCI DMA mask\n");
         goto disable_device;
     }
 
     pmcraid_disable_interrupts(pinstance, ~0);
     atomic_set(&pinstance->outstanding_cmds, 0);
     rc = pmcraid_register_interrupt_handler(pinstance);
 
     if (rc) {
         dev_err(&pdev->dev,
             "resume: couldn't register interrupt handlers\n");
         rc = -ENODEV;
         goto release_host;
     }
 
     pmcraid_init_tasklets(pinstance);
     pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
 
     /* Start with hard reset sequence which brings up IOA to operational
      * state as well as completes the reset sequence.
      */
     pinstance->ioa_hard_reset = 1;
 
     /* Start IOA firmware initialization and bring card to Operational
      * state.
      */
     if (pmcraid_reset_bringup(pinstance)) {
         dev_err(&pdev->dev, "couldn't initialize IOA\n");
         rc = -ENODEV;
         goto release_tasklets;
     }
 
     return 0;
 
 release_tasklets:
     pmcraid_disable_interrupts(pinstance, ~0);
     pmcraid_kill_tasklets(pinstance);
     pmcraid_unregister_interrupt_handler(pinstance);
 
 release_host:
     scsi_host_put(host);
 
 disable_device:
 
     return rc;
 }
 
 /**
  * pmcraid_complete_ioa_reset - Called by either timer or tasklet during
  *              completion of the ioa reset
  * @cmd: pointer to reset command block
  */
 static void pmcraid_complete_ioa_reset(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     unsigned long flags;
 
     spin_lock_irqsave(pinstance->host->host_lock, flags);
     pmcraid_ioa_reset(cmd);
     spin_unlock_irqrestore(pinstance->host->host_lock, flags);
     scsi_unblock_requests(pinstance->host);
     schedule_work(&pinstance->worker_q);
 }
 
 /**
  * pmcraid_set_supported_devs - sends SET SUPPORTED DEVICES to IOAFP
  *
  * @cmd: pointer to pmcraid_cmd structure
  *
  * Return Value
  *  0 for success or non-zero for failure cases
  */
 static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
     void (*cmd_done) (struct pmcraid_cmd *) = pmcraid_complete_ioa_reset;
 
     pmcraid_reinit_cmdblk(cmd);
 
     ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
     ioarcb->request_type = REQ_TYPE_IOACMD;
     ioarcb->cdb[0] = PMCRAID_SET_SUPPORTED_DEVICES;
     ioarcb->cdb[1] = ALL_DEVICES_SUPPORTED;
 
     /* If this was called as part of resource table reinitialization due to
      * lost CCN, it is enough to return the command block back to free pool
      * as part of set_supported_devs completion function.
      */
     if (cmd->drv_inst->reinit_cfg_table) {
         cmd->drv_inst->reinit_cfg_table = 0;
         cmd->release = 1;
         cmd_done = pmcraid_reinit_cfgtable_done;
     }
 
     /* we will be done with the reset sequence after set supported devices,
      * setup the done function to return the command block back to free
      * pool
      */
     pmcraid_send_cmd(cmd,
              cmd_done,
              PMCRAID_SET_SUP_DEV_TIMEOUT,
              pmcraid_timeout_handler);
     return;
 }
 
 /**
  * pmcraid_set_timestamp - set the timestamp to IOAFP
  *
  * @cmd: pointer to pmcraid_cmd structure
  *
  * Return Value
  *  0 for success or non-zero for failure cases
  */
 static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
     __be32 time_stamp_len = cpu_to_be32(PMCRAID_TIMESTAMP_LEN);
     struct pmcraid_ioadl_desc *ioadl;
     u64 timestamp;
 
     timestamp = ktime_get_real_seconds() * 1000;
 
     pinstance->timestamp_data->timestamp[0] = (__u8)(timestamp);
     pinstance->timestamp_data->timestamp[1] = (__u8)((timestamp) >> 8);
     pinstance->timestamp_data->timestamp[2] = (__u8)((timestamp) >> 16);
     pinstance->timestamp_data->timestamp[3] = (__u8)((timestamp) >> 24);
     pinstance->timestamp_data->timestamp[4] = (__u8)((timestamp) >> 32);
     pinstance->timestamp_data->timestamp[5] = (__u8)((timestamp)  >> 40);
 
     pmcraid_reinit_cmdblk(cmd);
     ioarcb->request_type = REQ_TYPE_SCSI;
     ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
     ioarcb->cdb[0] = PMCRAID_SCSI_SET_TIMESTAMP;
     ioarcb->cdb[1] = PMCRAID_SCSI_SERVICE_ACTION;
     memcpy(&(ioarcb->cdb[6]), &time_stamp_len, sizeof(time_stamp_len));
 
     ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
                     offsetof(struct pmcraid_ioarcb,
                         add_data.u.ioadl[0]));
     ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
     ioarcb->ioarcb_bus_addr &= cpu_to_le64(~(0x1FULL));
 
     ioarcb->request_flags0 |= NO_LINK_DESCS;
     ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
     ioarcb->data_transfer_length =
         cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
     ioadl = &(ioarcb->add_data.u.ioadl[0]);
     ioadl->flags = IOADL_FLAGS_LAST_DESC;
     ioadl->address = cpu_to_le64(pinstance->timestamp_data_baddr);
     ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
 
     if (!pinstance->timestamp_error) {
         pinstance->timestamp_error = 0;
         pmcraid_send_cmd(cmd, pmcraid_set_supported_devs,
              PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
     } else {
         pmcraid_send_cmd(cmd, pmcraid_return_cmd,
              PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
         return;
     }
 }
 
 
 /**
  * pmcraid_init_res_table - Initialize the resource table
  * @cmd:  pointer to pmcraid command struct
  *
  * This function looks through the existing resource table, comparing
  * it with the config table. This function will take care of old/new
  * devices and schedule adding/removing them from the mid-layer
  * as appropriate.
  *
  * Return value
  *   None
  */
 static void pmcraid_init_res_table(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     struct pmcraid_resource_entry *res, *temp;
     struct pmcraid_config_table_entry *cfgte;
     unsigned long lock_flags;
     int found, rc, i;
     u16 fw_version;
     LIST_HEAD(old_res);
 
     if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED)
         pmcraid_err("IOA requires microcode download\n");
 
     fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
 
     /* resource list is protected by pinstance->resource_lock.
      * init_res_table can be called from probe (user-thread) or runtime
      * reset (timer/tasklet)
      */
     spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
 
     list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue)
         list_move_tail(&res->queue, &old_res);
 
     for (i = 0; i < le16_to_cpu(pinstance->cfg_table->num_entries); i++) {
         if (be16_to_cpu(pinstance->inq_data->fw_version) <=
                         PMCRAID_FW_VERSION_1)
             cfgte = &pinstance->cfg_table->entries[i];
         else
             cfgte = (struct pmcraid_config_table_entry *)
                     &pinstance->cfg_table->entries_ext[i];
 
         if (!pmcraid_expose_resource(fw_version, cfgte))
             continue;
 
         found = 0;
 
         /* If this entry was already detected and initialized */
         list_for_each_entry_safe(res, temp, &old_res, queue) {
 
             rc = memcmp(&res->cfg_entry.resource_address,
                     &cfgte->resource_address,
                     sizeof(cfgte->resource_address));
             if (!rc) {
                 list_move_tail(&res->queue,
                         &pinstance->used_res_q);
                 found = 1;
                 break;
             }
         }
 
         /* If this is new entry, initialize it and add it the queue */
         if (!found) {
 
             if (list_empty(&pinstance->free_res_q)) {
                 pmcraid_err("Too many devices attached\n");
                 break;
             }
 
             found = 1;
             res = list_entry(pinstance->free_res_q.next,
                      struct pmcraid_resource_entry, queue);
 
             res->scsi_dev = NULL;
             res->change_detected = RES_CHANGE_ADD;
             res->reset_progress = 0;
             list_move_tail(&res->queue, &pinstance->used_res_q);
         }
 
         /* copy new configuration table entry details into driver
          * maintained resource entry
          */
         if (found) {
             memcpy(&res->cfg_entry, cfgte,
                     pinstance->config_table_entry_size);
             pmcraid_info("New res type:%x, vset:%x, addr:%x:\n",
                  res->cfg_entry.resource_type,
                  (fw_version <= PMCRAID_FW_VERSION_1 ?
                     res->cfg_entry.unique_flags1 :
                     le16_to_cpu(res->cfg_entry.array_id) & 0xFF),
                  le32_to_cpu(res->cfg_entry.resource_address));
         }
     }
 
     /* Detect any deleted entries, mark them for deletion from mid-layer */
     list_for_each_entry_safe(res, temp, &old_res, queue) {
 
         if (res->scsi_dev) {
             res->change_detected = RES_CHANGE_DEL;
             res->cfg_entry.resource_handle =
                 PMCRAID_INVALID_RES_HANDLE;
             list_move_tail(&res->queue, &pinstance->used_res_q);
         } else {
             list_move_tail(&res->queue, &pinstance->free_res_q);
         }
     }
 
     /* release the resource list lock */
     spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
     pmcraid_set_timestamp(cmd);
 }
 
 /**
  * pmcraid_querycfg - Send a Query IOA Config to the adapter.
  * @cmd: pointer pmcraid_cmd struct
  *
  * This function sends a Query IOA Configuration command to the adapter to
  * retrieve the IOA configuration table.
  *
  * Return value:
  *  none
  */
 static void pmcraid_querycfg(struct pmcraid_cmd *cmd)
 {
     struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
     struct pmcraid_ioadl_desc *ioadl;
     struct pmcraid_instance *pinstance = cmd->drv_inst;
     __be32 cfg_table_size = cpu_to_be32(sizeof(struct pmcraid_config_table));
 
     if (be16_to_cpu(pinstance->inq_data->fw_version) <=
                     PMCRAID_FW_VERSION_1)
         pinstance->config_table_entry_size =
             sizeof(struct pmcraid_config_table_entry);
     else
         pinstance->config_table_entry_size =
             sizeof(struct pmcraid_config_table_entry_ext);
 
     ioarcb->request_type = REQ_TYPE_IOACMD;
     ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
 
     ioarcb->cdb[0] = PMCRAID_QUERY_IOA_CONFIG;
 
     /* firmware requires 4-byte length field, specified in B.E format */
     memcpy(&(ioarcb->cdb[10]), &cfg_table_size, sizeof(cfg_table_size));
 
     /* Since entire config table can be described by single IOADL, it can
      * be part of IOARCB itself
      */
     ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
                     offsetof(struct pmcraid_ioarcb,
                         add_data.u.ioadl[0]));
     ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
     ioarcb->ioarcb_bus_addr &= cpu_to_le64(~0x1FULL);
 
     ioarcb->request_flags0 |= NO_LINK_DESCS;
     ioarcb->data_transfer_length =
         cpu_to_le32(sizeof(struct pmcraid_config_table));
 
     ioadl = &(ioarcb->add_data.u.ioadl[0]);
     ioadl->flags = IOADL_FLAGS_LAST_DESC;
     ioadl->address = cpu_to_le64(pinstance->cfg_table_bus_addr);
     ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_config_table));
 
     pmcraid_send_cmd(cmd, pmcraid_init_res_table,
              PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
 }
 
 
 /**
  * pmcraid_probe - PCI probe entry pointer for PMC MaxRAID controller driver
  * @pdev: pointer to pci device structure
  * @dev_id: pointer to device ids structure
  *
  * Return Value
  *  returns 0 if the device is claimed and successfully configured.
  *  returns non-zero error code in case of any failure
  */
 static int pmcraid_probe(struct pci_dev *pdev,
              const struct pci_device_id *dev_id)
 {
     struct pmcraid_instance *pinstance;
     struct Scsi_Host *host;
     void __iomem *mapped_pci_addr;
     int rc = PCIBIOS_SUCCESSFUL;
 
     if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) {
         pmcraid_err
             ("maximum number(%d) of supported adapters reached\n",
              atomic_read(&pmcraid_adapter_count));
         return -ENOMEM;
     }
 
     atomic_inc(&pmcraid_adapter_count);
     rc = pci_enable_device(pdev);
 
     if (rc) {
         dev_err(&pdev->dev, "Cannot enable adapter\n");
         atomic_dec(&pmcraid_adapter_count);
         return rc;
     }
 
     dev_info(&pdev->dev,
         "Found new IOA(%x:%x), Total IOA count: %d\n",
          pdev->vendor, pdev->device,
          atomic_read(&pmcraid_adapter_count));
 
     rc = pci_request_regions(pdev, PMCRAID_DRIVER_NAME);
 
     if (rc < 0) {
         dev_err(&pdev->dev,
             "Couldn't register memory range of registers\n");
         goto out_disable_device;
     }
 
     mapped_pci_addr = pci_iomap(pdev, 0, 0);
 
     if (!mapped_pci_addr) {
         dev_err(&pdev->dev, "Couldn't map PCI registers memory\n");
         rc = -ENOMEM;
         goto out_release_regions;
     }
 
     pci_set_master(pdev);
 
     /* Firmware requires the system bus address of IOARCB to be within
      * 32-bit addressable range though it has 64-bit IOARRIN register.
      * However, firmware supports 64-bit streaming DMA buffers, whereas
      * coherent buffers are to be 32-bit. Since dma_alloc_coherent always
      * returns memory within 4GB (if not, change this logic), coherent
      * buffers are within firmware acceptable address ranges.
      */
     if (sizeof(dma_addr_t) == 4 ||
         dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)))
         rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 
     /* firmware expects 32-bit DMA addresses for IOARRIN register; set 32
      * bit mask for dma_alloc_coherent to return addresses within 4GB
      */
     if (rc == 0)
         rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 
     if (rc != 0) {
         dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
         goto cleanup_nomem;
     }
 
     host = scsi_host_alloc(&pmcraid_host_template,
                 sizeof(struct pmcraid_instance));
 
     if (!host) {
         dev_err(&pdev->dev, "scsi_host_alloc failed!\n");
         rc = -ENOMEM;
         goto cleanup_nomem;
     }
 
     host->max_id = PMCRAID_MAX_NUM_TARGETS_PER_BUS;
     host->max_lun = PMCRAID_MAX_NUM_LUNS_PER_TARGET;
     host->unique_id = host->host_no;
     host->max_channel = PMCRAID_MAX_BUS_TO_SCAN;
     host->max_cmd_len = PMCRAID_MAX_CDB_LEN;
 
     /* zero out entire instance structure */
     pinstance = (struct pmcraid_instance *)host->hostdata;
     memset(pinstance, 0, sizeof(*pinstance));
 
     pinstance->chip_cfg =
         (struct pmcraid_chip_details *)(dev_id->driver_data);
 
     rc = pmcraid_init_instance(pdev, host, mapped_pci_addr);
 
     if (rc < 0) {
         dev_err(&pdev->dev, "failed to initialize adapter instance\n");
         goto out_scsi_host_put;
     }
 
     pci_set_drvdata(pdev, pinstance);
 
     /* Save PCI config-space for use following the reset */
     rc = pci_save_state(pinstance->pdev);
 
     if (rc != 0) {
         dev_err(&pdev->dev, "Failed to save PCI config space\n");
         goto out_scsi_host_put;
     }
 
     pmcraid_disable_interrupts(pinstance, ~0);
 
     rc = pmcraid_register_interrupt_handler(pinstance);
 
     if (rc) {
         dev_err(&pdev->dev, "couldn't register interrupt handler\n");
         goto out_scsi_host_put;
     }
 
     pmcraid_init_tasklets(pinstance);
 
     /* allocate verious buffers used by LLD.*/
     rc = pmcraid_init_buffers(pinstance);
 
     if (rc) {
         pmcraid_err("couldn't allocate memory blocks\n");
         goto out_unregister_isr;
     }
 
     /* check the reset type required */
     pmcraid_reset_type(pinstance);
 
     pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
 
     /* Start IOA firmware initialization and bring card to Operational
      * state.
      */
     pmcraid_info("starting IOA initialization sequence\n");
     if (pmcraid_reset_bringup(pinstance)) {
         dev_err(&pdev->dev, "couldn't initialize IOA\n");
         rc = 1;
         goto out_release_bufs;
     }
 
     /* Add adapter instance into mid-layer list */
     rc = scsi_add_host(pinstance->host, &pdev->dev);
     if (rc != 0) {
         pmcraid_err("couldn't add host into mid-layer: %d\n", rc);
         goto out_release_bufs;
     }
 
     scsi_scan_host(pinstance->host);
 
     rc = pmcraid_setup_chrdev(pinstance);
 
     if (rc != 0) {
         pmcraid_err("couldn't create mgmt interface, error: %x\n",
                  rc);
         goto out_remove_host;
     }
 
     /* Schedule worker thread to handle CCN and take care of adding and
      * removing devices to OS
      */
     atomic_set(&pinstance->expose_resources, 1);
     schedule_work(&pinstance->worker_q);
     return rc;
 
 out_remove_host:
     scsi_remove_host(host);
 
 out_release_bufs:
     pmcraid_release_buffers(pinstance);
 
 out_unregister_isr:
     pmcraid_kill_tasklets(pinstance);
     pmcraid_unregister_interrupt_handler(pinstance);
 
 out_scsi_host_put:
     scsi_host_put(host);
 
 cleanup_nomem:
     iounmap(mapped_pci_addr);
 
 out_release_regions:
     pci_release_regions(pdev);
 
 out_disable_device:
     atomic_dec(&pmcraid_adapter_count);
     pci_disable_device(pdev);
     return -ENODEV;
 }
 
 static SIMPLE_DEV_PM_OPS(pmcraid_pm_ops, pmcraid_suspend, pmcraid_resume);
 
 /*
  * PCI driver structure of pmcraid driver
  */
 static struct pci_driver pmcraid_driver = {
     .name = PMCRAID_DRIVER_NAME,
     .id_table = pmcraid_pci_table,
     .probe = pmcraid_probe,
     .remove = pmcraid_remove,
     .driver.pm = &pmcraid_pm_ops,
     .shutdown = pmcraid_shutdown
 };
 
 /**
  * pmcraid_init - module load entry point
  */
 static int __init pmcraid_init(void)
 {
     dev_t dev;
     int error;
 
     pmcraid_info("%s Device Driver version: %s\n",
              PMCRAID_DRIVER_NAME, PMCRAID_DRIVER_VERSION);
 
     error = alloc_chrdev_region(&dev, 0,
                     PMCRAID_MAX_ADAPTERS,
                     PMCRAID_DEVFILE);
 
     if (error) {
         pmcraid_err("failed to get a major number for adapters\n");
         goto out_init;
     }
 
     pmcraid_major = MAJOR(dev);
     pmcraid_class = class_create(THIS_MODULE, PMCRAID_DEVFILE);
 
     if (IS_ERR(pmcraid_class)) {
         error = PTR_ERR(pmcraid_class);
         pmcraid_err("failed to register with sysfs, error = %x\n",
                 error);
         goto out_unreg_chrdev;
     }
 
     error = pmcraid_netlink_init();
 
     if (error) {
         class_destroy(pmcraid_class);
         goto out_unreg_chrdev;
     }
 
     error = pci_register_driver(&pmcraid_driver);
 
     if (error == 0)
         goto out_init;
 
     pmcraid_err("failed to register pmcraid driver, error = %x\n",
              error);
     class_destroy(pmcraid_class);
     pmcraid_netlink_release();
 
 out_unreg_chrdev:
     unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS);
 
 out_init:
     return error;
 }
 
 /**
  * pmcraid_exit - module unload entry point
  */
 static void __exit pmcraid_exit(void)
 {
     pmcraid_netlink_release();
     unregister_chrdev_region(MKDEV(pmcraid_major, 0),
                  PMCRAID_MAX_ADAPTERS);
     pci_unregister_driver(&pmcraid_driver);
     class_destroy(pmcraid_class);
 }
 
 module_init(pmcraid_init);
 module_exit(pmcraid_exit);