Version:  2.6.24 2.6.25 2.6.26 2.6.27 2.6.28 2.6.29 2.6.30 2.6.31 2.6.32 2.6.33 2.6.34-rc2

Architecture:  x86 arm avr32 blackfin m68k m68knommu microblaze mips powerpc sh

   /*
    *
    *              Linux MegaRAID driver for SAS based RAID controllers
    *
    * Copyright (c) 2003-2005  LSI Corporation.
    *
    *         This program is free software; you can redistribute it and/or
    *         modify it under the terms of the GNU General Public License
    *         as published by the Free Software Foundation; either version
   *         2 of the License, or (at your option) any later version.
   *
   * FILE         : megaraid_sas.c
   * Version     : v00.00.04.12-rc1
   *
   * Authors:
   *      (email-id : megaraidlinux@lsi.com)
   *      Sreenivas Bagalkote
   *      Sumant Patro
   *      Bo Yang
   *
   * List of supported controllers
   *
   * OEM  Product Name                    VID     DID     SSVID   SSID
   * ---  ------------                    ---     ---     ----    ----
   */
  
  #include <linux/kernel.h>
  #include <linux/types.h>
  #include <linux/pci.h>
  #include <linux/list.h>
  #include <linux/moduleparam.h>
  #include <linux/module.h>
  #include <linux/spinlock.h>
  #include <linux/interrupt.h>
  #include <linux/delay.h>
  #include <linux/smp_lock.h>
  #include <linux/uio.h>
  #include <asm/uaccess.h>
  #include <linux/fs.h>
  #include <linux/compat.h>
  #include <linux/blkdev.h>
  #include <linux/mutex.h>
  #include <linux/poll.h>
  
  #include <scsi/scsi.h>
  #include <scsi/scsi_cmnd.h>
  #include <scsi/scsi_device.h>
  #include <scsi/scsi_host.h>
  #include "megaraid_sas.h"
  
  /*
   * poll_mode_io:1- schedule complete completion from q cmd
   */
  static unsigned int poll_mode_io;
  module_param_named(poll_mode_io, poll_mode_io, int, 0);
  MODULE_PARM_DESC(poll_mode_io,
          "Complete cmds from IO path, (default=0)");
  
  MODULE_LICENSE("GPL");
  MODULE_VERSION(MEGASAS_VERSION);
  MODULE_AUTHOR("megaraidlinux@lsi.com");
  MODULE_DESCRIPTION("LSI MegaRAID SAS Driver");
  
  /*
   * PCI ID table for all supported controllers
   */
  static struct pci_device_id megasas_pci_table[] = {
  
          {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_SAS1064R)},
          /* xscale IOP */
          {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_SAS1078R)},
          /* ppc IOP */
          {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_SAS1078DE)},
          /* ppc IOP */
          {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_SAS1078GEN2)},
          /* gen2*/
          {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_SAS0079GEN2)},
          /* gen2*/
          {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_SAS0073SKINNY)},
          /* skinny*/
          {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_SAS0071SKINNY)},
          /* skinny*/
          {PCI_DEVICE(PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_VERDE_ZCR)},
          /* xscale IOP, vega */
          {PCI_DEVICE(PCI_VENDOR_ID_DELL, PCI_DEVICE_ID_DELL_PERC5)},
          /* xscale IOP */
          {}
  };
  
  MODULE_DEVICE_TABLE(pci, megasas_pci_table);
  
  static int megasas_mgmt_majorno;
  static struct megasas_mgmt_info megasas_mgmt_info;
  static struct fasync_struct *megasas_async_queue;
  static DEFINE_MUTEX(megasas_async_queue_mutex);
  
  static int megasas_poll_wait_aen;
  static DECLARE_WAIT_QUEUE_HEAD(megasas_poll_wait);
  static u32 support_poll_for_event;
 static u32 megasas_dbg_lvl;
 
 /* define lock for aen poll */
 spinlock_t poll_aen_lock;
 
 static void
 megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
                      u8 alt_status);
 
 /**
  * megasas_get_cmd -    Get a command from the free pool
  * @instance:           Adapter soft state
  *
  * Returns a free command from the pool
  */
 static struct megasas_cmd *megasas_get_cmd(struct megasas_instance
                                                   *instance)
 {
         unsigned long flags;
         struct megasas_cmd *cmd = NULL;
 
         spin_lock_irqsave(&instance->cmd_pool_lock, flags);
 
         if (!list_empty(&instance->cmd_pool)) {
                 cmd = list_entry((&instance->cmd_pool)->next,
                                  struct megasas_cmd, list);
                 list_del_init(&cmd->list);
         } else {
                 printk(KERN_ERR "megasas: Command pool empty!\n");
         }
 
         spin_unlock_irqrestore(&instance->cmd_pool_lock, flags);
         return cmd;
 }
 
 /**
  * megasas_return_cmd - Return a cmd to free command pool
  * @instance:           Adapter soft state
  * @cmd:                Command packet to be returned to free command pool
  */
 static inline void
 megasas_return_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd)
 {
         unsigned long flags;
 
         spin_lock_irqsave(&instance->cmd_pool_lock, flags);
 
         cmd->scmd = NULL;
         list_add_tail(&cmd->list, &instance->cmd_pool);
 
         spin_unlock_irqrestore(&instance->cmd_pool_lock, flags);
 }
 
 
 /**
 *       The following functions are defined for xscale 
 *       (deviceid : 1064R, PERC5) controllers
 */
 
 /**
  * megasas_enable_intr_xscale - Enables interrupts
  * @regs:                       MFI register set
  */
 static inline void
 megasas_enable_intr_xscale(struct megasas_register_set __iomem * regs)
 {
         writel(1, &(regs)->outbound_intr_mask);
 
         /* Dummy readl to force pci flush */
         readl(&regs->outbound_intr_mask);
 }
 
 /**
  * megasas_disable_intr_xscale -Disables interrupt
  * @regs:                       MFI register set
  */
 static inline void
 megasas_disable_intr_xscale(struct megasas_register_set __iomem * regs)
 {
         u32 mask = 0x1f;
         writel(mask, &regs->outbound_intr_mask);
         /* Dummy readl to force pci flush */
         readl(&regs->outbound_intr_mask);
 }
 
 /**
  * megasas_read_fw_status_reg_xscale - returns the current FW status value
  * @regs:                       MFI register set
  */
 static u32
 megasas_read_fw_status_reg_xscale(struct megasas_register_set __iomem * regs)
 {
         return readl(&(regs)->outbound_msg_0);
 }
 /**
  * megasas_clear_interrupt_xscale -     Check & clear interrupt
  * @regs:                               MFI register set
  */
 static int 
 megasas_clear_intr_xscale(struct megasas_register_set __iomem * regs)
 {
         u32 status;
         /*
          * Check if it is our interrupt
          */
         status = readl(&regs->outbound_intr_status);
 
         if (!(status & MFI_OB_INTR_STATUS_MASK)) {
                 return 1;
         }
 
         /*
          * Clear the interrupt by writing back the same value
          */
         writel(status, &regs->outbound_intr_status);
 
         /* Dummy readl to force pci flush */
         readl(&regs->outbound_intr_status);
 
         return 0;
 }
 
 /**
  * megasas_fire_cmd_xscale -    Sends command to the FW
  * @frame_phys_addr :           Physical address of cmd
  * @frame_count :               Number of frames for the command
  * @regs :                      MFI register set
  */
 static inline void 
 megasas_fire_cmd_xscale(struct megasas_instance *instance,
                 dma_addr_t frame_phys_addr,
                 u32 frame_count,
                 struct megasas_register_set __iomem *regs)
 {
         writel((frame_phys_addr >> 3)|(frame_count),
                &(regs)->inbound_queue_port);
 }
 
 static struct megasas_instance_template megasas_instance_template_xscale = {
 
         .fire_cmd = megasas_fire_cmd_xscale,
         .enable_intr = megasas_enable_intr_xscale,
         .disable_intr = megasas_disable_intr_xscale,
         .clear_intr = megasas_clear_intr_xscale,
         .read_fw_status_reg = megasas_read_fw_status_reg_xscale,
 };
 
 /**
 *       This is the end of set of functions & definitions specific 
 *       to xscale (deviceid : 1064R, PERC5) controllers
 */
 
 /**
 *       The following functions are defined for ppc (deviceid : 0x60) 
 *       controllers
 */
 
 /**
  * megasas_enable_intr_ppc -    Enables interrupts
  * @regs:                       MFI register set
  */
 static inline void
 megasas_enable_intr_ppc(struct megasas_register_set __iomem * regs)
 {
         writel(0xFFFFFFFF, &(regs)->outbound_doorbell_clear);
     
         writel(~0x80000004, &(regs)->outbound_intr_mask);
 
         /* Dummy readl to force pci flush */
         readl(&regs->outbound_intr_mask);
 }
 
 /**
  * megasas_disable_intr_ppc -   Disable interrupt
  * @regs:                       MFI register set
  */
 static inline void
 megasas_disable_intr_ppc(struct megasas_register_set __iomem * regs)
 {
         u32 mask = 0xFFFFFFFF;
         writel(mask, &regs->outbound_intr_mask);
         /* Dummy readl to force pci flush */
         readl(&regs->outbound_intr_mask);
 }
 
 /**
  * megasas_read_fw_status_reg_ppc - returns the current FW status value
  * @regs:                       MFI register set
  */
 static u32
 megasas_read_fw_status_reg_ppc(struct megasas_register_set __iomem * regs)
 {
         return readl(&(regs)->outbound_scratch_pad);
 }
 
 /**
  * megasas_clear_interrupt_ppc -        Check & clear interrupt
  * @regs:                               MFI register set
  */
 static int 
 megasas_clear_intr_ppc(struct megasas_register_set __iomem * regs)
 {
         u32 status;
         /*
          * Check if it is our interrupt
          */
         status = readl(&regs->outbound_intr_status);
 
         if (!(status & MFI_REPLY_1078_MESSAGE_INTERRUPT)) {
                 return 1;
         }
 
         /*
          * Clear the interrupt by writing back the same value
          */
         writel(status, &regs->outbound_doorbell_clear);
 
         /* Dummy readl to force pci flush */
         readl(&regs->outbound_doorbell_clear);
 
         return 0;
 }
 /**
  * megasas_fire_cmd_ppc -       Sends command to the FW
  * @frame_phys_addr :           Physical address of cmd
  * @frame_count :               Number of frames for the command
  * @regs :                      MFI register set
  */
 static inline void 
 megasas_fire_cmd_ppc(struct megasas_instance *instance,
                 dma_addr_t frame_phys_addr,
                 u32 frame_count,
                 struct megasas_register_set __iomem *regs)
 {
         writel((frame_phys_addr | (frame_count<<1))|1, 
                         &(regs)->inbound_queue_port);
 }
 
 static struct megasas_instance_template megasas_instance_template_ppc = {
         
         .fire_cmd = megasas_fire_cmd_ppc,
         .enable_intr = megasas_enable_intr_ppc,
         .disable_intr = megasas_disable_intr_ppc,
         .clear_intr = megasas_clear_intr_ppc,
         .read_fw_status_reg = megasas_read_fw_status_reg_ppc,
 };
 
 /**
  * megasas_enable_intr_skinny - Enables interrupts
  * @regs:                       MFI register set
  */
 static inline void
 megasas_enable_intr_skinny(struct megasas_register_set __iomem *regs)
 {
         writel(0xFFFFFFFF, &(regs)->outbound_intr_mask);
 
         writel(~MFI_SKINNY_ENABLE_INTERRUPT_MASK, &(regs)->outbound_intr_mask);
 
         /* Dummy readl to force pci flush */
         readl(&regs->outbound_intr_mask);
 }
 
 /**
  * megasas_disable_intr_skinny -        Disables interrupt
  * @regs:                       MFI register set
  */
 static inline void
 megasas_disable_intr_skinny(struct megasas_register_set __iomem *regs)
 {
         u32 mask = 0xFFFFFFFF;
         writel(mask, &regs->outbound_intr_mask);
         /* Dummy readl to force pci flush */
         readl(&regs->outbound_intr_mask);
 }
 
 /**
  * megasas_read_fw_status_reg_skinny - returns the current FW status value
  * @regs:                       MFI register set
  */
 static u32
 megasas_read_fw_status_reg_skinny(struct megasas_register_set __iomem *regs)
 {
         return readl(&(regs)->outbound_scratch_pad);
 }
 
 /**
  * megasas_clear_interrupt_skinny -     Check & clear interrupt
  * @regs:                               MFI register set
  */
 static int
 megasas_clear_intr_skinny(struct megasas_register_set __iomem *regs)
 {
         u32 status;
         /*
          * Check if it is our interrupt
          */
         status = readl(&regs->outbound_intr_status);
 
         if (!(status & MFI_SKINNY_ENABLE_INTERRUPT_MASK)) {
                 return 1;
         }
 
         /*
          * Clear the interrupt by writing back the same value
          */
         writel(status, &regs->outbound_intr_status);
 
         /*
         * dummy read to flush PCI
         */
         readl(&regs->outbound_intr_status);
 
         return 0;
 }
 
 /**
  * megasas_fire_cmd_skinny -    Sends command to the FW
  * @frame_phys_addr :           Physical address of cmd
  * @frame_count :               Number of frames for the command
  * @regs :                      MFI register set
  */
 static inline void
 megasas_fire_cmd_skinny(struct megasas_instance *instance,
                         dma_addr_t frame_phys_addr,
                         u32 frame_count,
                         struct megasas_register_set __iomem *regs)
 {
         unsigned long flags;
         spin_lock_irqsave(&instance->fire_lock, flags);
         writel(0, &(regs)->inbound_high_queue_port);
         writel((frame_phys_addr | (frame_count<<1))|1,
                 &(regs)->inbound_low_queue_port);
         spin_unlock_irqrestore(&instance->fire_lock, flags);
 }
 
 static struct megasas_instance_template megasas_instance_template_skinny = {
 
         .fire_cmd = megasas_fire_cmd_skinny,
         .enable_intr = megasas_enable_intr_skinny,
         .disable_intr = megasas_disable_intr_skinny,
         .clear_intr = megasas_clear_intr_skinny,
         .read_fw_status_reg = megasas_read_fw_status_reg_skinny,
 };
 
 
 /**
 *       The following functions are defined for gen2 (deviceid : 0x78 0x79)
 *       controllers
 */
 
 /**
  * megasas_enable_intr_gen2 -  Enables interrupts
  * @regs:                      MFI register set
  */
 static inline void
 megasas_enable_intr_gen2(struct megasas_register_set __iomem *regs)
 {
         writel(0xFFFFFFFF, &(regs)->outbound_doorbell_clear);
 
         /* write ~0x00000005 (4 & 1) to the intr mask*/
         writel(~MFI_GEN2_ENABLE_INTERRUPT_MASK, &(regs)->outbound_intr_mask);
 
         /* Dummy readl to force pci flush */
         readl(&regs->outbound_intr_mask);
 }
 
 /**
  * megasas_disable_intr_gen2 - Disables interrupt
  * @regs:                      MFI register set
  */
 static inline void
 megasas_disable_intr_gen2(struct megasas_register_set __iomem *regs)
 {
         u32 mask = 0xFFFFFFFF;
         writel(mask, &regs->outbound_intr_mask);
         /* Dummy readl to force pci flush */
         readl(&regs->outbound_intr_mask);
 }
 
 /**
  * megasas_read_fw_status_reg_gen2 - returns the current FW status value
  * @regs:                      MFI register set
  */
 static u32
 megasas_read_fw_status_reg_gen2(struct megasas_register_set __iomem *regs)
 {
         return readl(&(regs)->outbound_scratch_pad);
 }
 
 /**
  * megasas_clear_interrupt_gen2 -      Check & clear interrupt
  * @regs:                              MFI register set
  */
 static int
 megasas_clear_intr_gen2(struct megasas_register_set __iomem *regs)
 {
         u32 status;
         /*
          * Check if it is our interrupt
          */
         status = readl(&regs->outbound_intr_status);
 
         if (!(status & MFI_GEN2_ENABLE_INTERRUPT_MASK))
                 return 1;
 
         /*
          * Clear the interrupt by writing back the same value
          */
         writel(status, &regs->outbound_doorbell_clear);
 
         /* Dummy readl to force pci flush */
         readl(&regs->outbound_intr_status);
 
         return 0;
 }
 /**
  * megasas_fire_cmd_gen2 -     Sends command to the FW
  * @frame_phys_addr :          Physical address of cmd
  * @frame_count :              Number of frames for the command
  * @regs :                     MFI register set
  */
 static inline void
 megasas_fire_cmd_gen2(struct megasas_instance *instance,
                         dma_addr_t frame_phys_addr,
                         u32 frame_count,
                         struct megasas_register_set __iomem *regs)
 {
         writel((frame_phys_addr | (frame_count<<1))|1,
                         &(regs)->inbound_queue_port);
 }
 
 static struct megasas_instance_template megasas_instance_template_gen2 = {
 
         .fire_cmd = megasas_fire_cmd_gen2,
         .enable_intr = megasas_enable_intr_gen2,
         .disable_intr = megasas_disable_intr_gen2,
         .clear_intr = megasas_clear_intr_gen2,
         .read_fw_status_reg = megasas_read_fw_status_reg_gen2,
 };
 
 /**
 *       This is the end of set of functions & definitions
 *       specific to ppc (deviceid : 0x60) controllers
 */
 
 /**
  * megasas_issue_polled -       Issues a polling command
  * @instance:                   Adapter soft state
  * @cmd:                        Command packet to be issued 
  *
  * For polling, MFI requires the cmd_status to be set to 0xFF before posting.
  */
 static int
 megasas_issue_polled(struct megasas_instance *instance, struct megasas_cmd *cmd)
 {
         int i;
         u32 msecs = MFI_POLL_TIMEOUT_SECS * 1000;
 
         struct megasas_header *frame_hdr = &cmd->frame->hdr;
 
         frame_hdr->cmd_status = 0xFF;
         frame_hdr->flags |= MFI_FRAME_DONT_POST_IN_REPLY_QUEUE;
 
         /*
          * Issue the frame using inbound queue port
          */
         instance->instancet->fire_cmd(instance,
                         cmd->frame_phys_addr, 0, instance->reg_set);
 
         /*
          * Wait for cmd_status to change
          */
         for (i = 0; (i < msecs) && (frame_hdr->cmd_status == 0xff); i++) {
                 rmb();
                 msleep(1);
         }
 
         if (frame_hdr->cmd_status == 0xff)
                 return -ETIME;
 
         return 0;
 }
 
 /**
  * megasas_issue_blocked_cmd -  Synchronous wrapper around regular FW cmds
  * @instance:                   Adapter soft state
  * @cmd:                        Command to be issued
  *
  * This function waits on an event for the command to be returned from ISR.
  * Max wait time is MEGASAS_INTERNAL_CMD_WAIT_TIME secs
  * Used to issue ioctl commands.
  */
 static int
 megasas_issue_blocked_cmd(struct megasas_instance *instance,
                           struct megasas_cmd *cmd)
 {
         cmd->cmd_status = ENODATA;
 
         instance->instancet->fire_cmd(instance,
                         cmd->frame_phys_addr, 0, instance->reg_set);
 
         wait_event_timeout(instance->int_cmd_wait_q, (cmd->cmd_status != ENODATA),
                 MEGASAS_INTERNAL_CMD_WAIT_TIME*HZ);
 
         return 0;
 }
 
 /**
  * megasas_issue_blocked_abort_cmd -    Aborts previously issued cmd
  * @instance:                           Adapter soft state
  * @cmd_to_abort:                       Previously issued cmd to be aborted
  *
  * MFI firmware can abort previously issued AEN comamnd (automatic event
  * notification). The megasas_issue_blocked_abort_cmd() issues such abort
  * cmd and waits for return status.
  * Max wait time is MEGASAS_INTERNAL_CMD_WAIT_TIME secs
  */
 static int
 megasas_issue_blocked_abort_cmd(struct megasas_instance *instance,
                                 struct megasas_cmd *cmd_to_abort)
 {
         struct megasas_cmd *cmd;
         struct megasas_abort_frame *abort_fr;
 
         cmd = megasas_get_cmd(instance);
 
         if (!cmd)
                 return -1;
 
         abort_fr = &cmd->frame->abort;
 
         /*
          * Prepare and issue the abort frame
          */
         abort_fr->cmd = MFI_CMD_ABORT;
         abort_fr->cmd_status = 0xFF;
         abort_fr->flags = 0;
         abort_fr->abort_context = cmd_to_abort->index;
         abort_fr->abort_mfi_phys_addr_lo = cmd_to_abort->frame_phys_addr;
         abort_fr->abort_mfi_phys_addr_hi = 0;
 
         cmd->sync_cmd = 1;
         cmd->cmd_status = 0xFF;
 
         instance->instancet->fire_cmd(instance,
                         cmd->frame_phys_addr, 0, instance->reg_set);
 
         /*
          * Wait for this cmd to complete
          */
         wait_event_timeout(instance->abort_cmd_wait_q, (cmd->cmd_status != 0xFF),
                 MEGASAS_INTERNAL_CMD_WAIT_TIME*HZ);
 
         megasas_return_cmd(instance, cmd);
         return 0;
 }
 
 /**
  * megasas_make_sgl32 - Prepares 32-bit SGL
  * @instance:           Adapter soft state
  * @scp:                SCSI command from the mid-layer
  * @mfi_sgl:            SGL to be filled in
  *
  * If successful, this function returns the number of SG elements. Otherwise,
  * it returnes -1.
  */
 static int
 megasas_make_sgl32(struct megasas_instance *instance, struct scsi_cmnd *scp,
                    union megasas_sgl *mfi_sgl)
 {
         int i;
         int sge_count;
         struct scatterlist *os_sgl;
 
         sge_count = scsi_dma_map(scp);
         BUG_ON(sge_count < 0);
 
         if (sge_count) {
                 scsi_for_each_sg(scp, os_sgl, sge_count, i) {
                         mfi_sgl->sge32[i].length = sg_dma_len(os_sgl);
                         mfi_sgl->sge32[i].phys_addr = sg_dma_address(os_sgl);
                 }
         }
         return sge_count;
 }
 
 /**
  * megasas_make_sgl64 - Prepares 64-bit SGL
  * @instance:           Adapter soft state
  * @scp:                SCSI command from the mid-layer
  * @mfi_sgl:            SGL to be filled in
  *
  * If successful, this function returns the number of SG elements. Otherwise,
  * it returnes -1.
  */
 static int
 megasas_make_sgl64(struct megasas_instance *instance, struct scsi_cmnd *scp,
                    union megasas_sgl *mfi_sgl)
 {
         int i;
         int sge_count;
         struct scatterlist *os_sgl;
 
         sge_count = scsi_dma_map(scp);
         BUG_ON(sge_count < 0);
 
         if (sge_count) {
                 scsi_for_each_sg(scp, os_sgl, sge_count, i) {
                         mfi_sgl->sge64[i].length = sg_dma_len(os_sgl);
                         mfi_sgl->sge64[i].phys_addr = sg_dma_address(os_sgl);
                 }
         }
         return sge_count;
 }
 
 /**
  * megasas_make_sgl_skinny - Prepares IEEE SGL
  * @instance:           Adapter soft state
  * @scp:                SCSI command from the mid-layer
  * @mfi_sgl:            SGL to be filled in
  *
  * If successful, this function returns the number of SG elements. Otherwise,
  * it returnes -1.
  */
 static int
 megasas_make_sgl_skinny(struct megasas_instance *instance,
                 struct scsi_cmnd *scp, union megasas_sgl *mfi_sgl)
 {
         int i;
         int sge_count;
         struct scatterlist *os_sgl;
 
         sge_count = scsi_dma_map(scp);
 
         if (sge_count) {
                 scsi_for_each_sg(scp, os_sgl, sge_count, i) {
                         mfi_sgl->sge_skinny[i].length = sg_dma_len(os_sgl);
                         mfi_sgl->sge_skinny[i].phys_addr =
                                                 sg_dma_address(os_sgl);
                 }
         }
         return sge_count;
 }
 
  /**
  * megasas_get_frame_count - Computes the number of frames
  * @frame_type          : type of frame- io or pthru frame
  * @sge_count           : number of sg elements
  *
  * Returns the number of frames required for numnber of sge's (sge_count)
  */
 
 static u32 megasas_get_frame_count(struct megasas_instance *instance,
                         u8 sge_count, u8 frame_type)
 {
         int num_cnt;
         int sge_bytes;
         u32 sge_sz;
         u32 frame_count=0;
 
         sge_sz = (IS_DMA64) ? sizeof(struct megasas_sge64) :
             sizeof(struct megasas_sge32);
 
         if (instance->flag_ieee) {
                 sge_sz = sizeof(struct megasas_sge_skinny);
         }
 
         /*
          * Main frame can contain 2 SGEs for 64-bit SGLs and
          * 3 SGEs for 32-bit SGLs for ldio &
          * 1 SGEs for 64-bit SGLs and
          * 2 SGEs for 32-bit SGLs for pthru frame
          */
         if (unlikely(frame_type == PTHRU_FRAME)) {
                 if (instance->flag_ieee == 1) {
                         num_cnt = sge_count - 1;
                 } else if (IS_DMA64)
                         num_cnt = sge_count - 1;
                 else
                         num_cnt = sge_count - 2;
         } else {
                 if (instance->flag_ieee == 1) {
                         num_cnt = sge_count - 1;
                 } else if (IS_DMA64)
                         num_cnt = sge_count - 2;
                 else
                         num_cnt = sge_count - 3;
         }
 
         if(num_cnt>0){
                 sge_bytes = sge_sz * num_cnt;
 
                 frame_count = (sge_bytes / MEGAMFI_FRAME_SIZE) +
                     ((sge_bytes % MEGAMFI_FRAME_SIZE) ? 1 : 0) ;
         }
         /* Main frame */
         frame_count +=1;
 
         if (frame_count > 7)
                 frame_count = 8;
         return frame_count;
 }
 
 /**
  * megasas_build_dcdb - Prepares a direct cdb (DCDB) command
  * @instance:           Adapter soft state
  * @scp:                SCSI command
  * @cmd:                Command to be prepared in
  *
  * This function prepares CDB commands. These are typcially pass-through
  * commands to the devices.
  */
 static int
 megasas_build_dcdb(struct megasas_instance *instance, struct scsi_cmnd *scp,
                    struct megasas_cmd *cmd)
 {
         u32 is_logical;
         u32 device_id;
         u16 flags = 0;
         struct megasas_pthru_frame *pthru;
 
         is_logical = MEGASAS_IS_LOGICAL(scp);
         device_id = MEGASAS_DEV_INDEX(instance, scp);
         pthru = (struct megasas_pthru_frame *)cmd->frame;
 
         if (scp->sc_data_direction == PCI_DMA_TODEVICE)
                 flags = MFI_FRAME_DIR_WRITE;
         else if (scp->sc_data_direction == PCI_DMA_FROMDEVICE)
                 flags = MFI_FRAME_DIR_READ;
         else if (scp->sc_data_direction == PCI_DMA_NONE)
                 flags = MFI_FRAME_DIR_NONE;
 
         if (instance->flag_ieee == 1) {
                 flags |= MFI_FRAME_IEEE;
         }
 
         /*
          * Prepare the DCDB frame
          */
         pthru->cmd = (is_logical) ? MFI_CMD_LD_SCSI_IO : MFI_CMD_PD_SCSI_IO;
         pthru->cmd_status = 0x0;
         pthru->scsi_status = 0x0;
         pthru->target_id = device_id;
         pthru->lun = scp->device->lun;
         pthru->cdb_len = scp->cmd_len;
         pthru->timeout = 0;
         pthru->flags = flags;
         pthru->data_xfer_len = scsi_bufflen(scp);
 
         memcpy(pthru->cdb, scp->cmnd, scp->cmd_len);
 
         /*
         * If the command is for the tape device, set the
         * pthru timeout to the os layer timeout value.
         */
         if (scp->device->type == TYPE_TAPE) {
                 if ((scp->request->timeout / HZ) > 0xFFFF)
                         pthru->timeout = 0xFFFF;
                 else
                         pthru->timeout = scp->request->timeout / HZ;
         }
 
         /*
          * Construct SGL
          */
         if (instance->flag_ieee == 1) {
                 pthru->flags |= MFI_FRAME_SGL64;
                 pthru->sge_count = megasas_make_sgl_skinny(instance, scp,
                                                       &pthru->sgl);
         } else if (IS_DMA64) {
                 pthru->flags |= MFI_FRAME_SGL64;
                 pthru->sge_count = megasas_make_sgl64(instance, scp,
                                                       &pthru->sgl);
         } else
                 pthru->sge_count = megasas_make_sgl32(instance, scp,
                                                       &pthru->sgl);
 
         /*
          * Sense info specific
          */
         pthru->sense_len = SCSI_SENSE_BUFFERSIZE;
         pthru->sense_buf_phys_addr_hi = 0;
         pthru->sense_buf_phys_addr_lo = cmd->sense_phys_addr;
 
         /*
          * Compute the total number of frames this command consumes. FW uses
          * this number to pull sufficient number of frames from host memory.
          */
         cmd->frame_count = megasas_get_frame_count(instance, pthru->sge_count,
                                                         PTHRU_FRAME);
 
         return cmd->frame_count;
 }
 
 /**
  * megasas_build_ldio - Prepares IOs to logical devices
  * @instance:           Adapter soft state
  * @scp:                SCSI command
  * @cmd:                Command to be prepared
  *
  * Frames (and accompanying SGLs) for regular SCSI IOs use this function.
  */
 static int
 megasas_build_ldio(struct megasas_instance *instance, struct scsi_cmnd *scp,
                    struct megasas_cmd *cmd)
 {
         u32 device_id;
         u8 sc = scp->cmnd[0];
         u16 flags = 0;
         struct megasas_io_frame *ldio;
 
         device_id = MEGASAS_DEV_INDEX(instance, scp);
         ldio = (struct megasas_io_frame *)cmd->frame;
 
         if (scp->sc_data_direction == PCI_DMA_TODEVICE)
                 flags = MFI_FRAME_DIR_WRITE;
         else if (scp->sc_data_direction == PCI_DMA_FROMDEVICE)
                 flags = MFI_FRAME_DIR_READ;
 
         if (instance->flag_ieee == 1) {
                 flags |= MFI_FRAME_IEEE;
         }
 
         /*
          * Prepare the Logical IO frame: 2nd bit is zero for all read cmds
          */
         ldio->cmd = (sc & 0x02) ? MFI_CMD_LD_WRITE : MFI_CMD_LD_READ;
         ldio->cmd_status = 0x0;
         ldio->scsi_status = 0x0;
         ldio->target_id = device_id;
         ldio->timeout = 0;
         ldio->reserved_0 = 0;
         ldio->pad_0 = 0;
         ldio->flags = flags;
         ldio->start_lba_hi = 0;
         ldio->access_byte = (scp->cmd_len != 6) ? scp->cmnd[1] : 0;
 
         /*
          * 6-byte READ(0x08) or WRITE(0x0A) cdb
          */
         if (scp->cmd_len == 6) {
                 ldio->lba_count = (u32) scp->cmnd[4];
                 ldio->start_lba_lo = ((u32) scp->cmnd[1] << 16) |
                     ((u32) scp->cmnd[2] << 8) | (u32) scp->cmnd[3];
 
                 ldio->start_lba_lo &= 0x1FFFFF;
         }
 
         /*
          * 10-byte READ(0x28) or WRITE(0x2A) cdb
          */
         else if (scp->cmd_len == 10) {
                 ldio->lba_count = (u32) scp->cmnd[8] |
                     ((u32) scp->cmnd[7] << 8);
                 ldio->start_lba_lo = ((u32) scp->cmnd[2] << 24) |
                     ((u32) scp->cmnd[3] << 16) |
                     ((u32) scp->cmnd[4] << 8) | (u32) scp->cmnd[5];
         }
 
         /*
          * 12-byte READ(0xA8) or WRITE(0xAA) cdb
          */
         else if (scp->cmd_len == 12) {
                 ldio->lba_count = ((u32) scp->cmnd[6] << 24) |
                     ((u32) scp->cmnd[7] << 16) |
                     ((u32) scp->cmnd[8] << 8) | (u32) scp->cmnd[9];
 
                 ldio->start_lba_lo = ((u32) scp->cmnd[2] << 24) |
                     ((u32) scp->cmnd[3] << 16) |
                     ((u32) scp->cmnd[4] << 8) | (u32) scp->cmnd[5];
         }
 
         /*
          * 16-byte READ(0x88) or WRITE(0x8A) cdb
          */
         else if (scp->cmd_len == 16) {
                 ldio->lba_count = ((u32) scp->cmnd[10] << 24) |
                     ((u32) scp->cmnd[11] << 16) |
                     ((u32) scp->cmnd[12] << 8) | (u32) scp->cmnd[13];
 
                 ldio->start_lba_lo = ((u32) scp->cmnd[6] << 24) |
                     ((u32) scp->cmnd[7] << 16) |
                     ((u32) scp->cmnd[8] << 8) | (u32) scp->cmnd[9];
 
                 ldio->start_lba_hi = ((u32) scp->cmnd[2] << 24) |
                     ((u32) scp->cmnd[3] << 16) |
                     ((u32) scp->cmnd[4] << 8) | (u32) scp->cmnd[5];
 
         }
 
         /*
          * Construct SGL
          */
         if (instance->flag_ieee) {
                 ldio->flags |= MFI_FRAME_SGL64;
                 ldio->sge_count = megasas_make_sgl_skinny(instance, scp,
                                               &ldio->sgl);
         } else if (IS_DMA64) {
                 ldio->flags |= MFI_FRAME_SGL64;
                 ldio->sge_count = megasas_make_sgl64(instance, scp, &ldio->sgl);
         } else
                 ldio->sge_count = megasas_make_sgl32(instance, scp, &ldio->sgl);
 
         /*
          * Sense info specific
          */
         ldio->sense_len = SCSI_SENSE_BUFFERSIZE;
         ldio->sense_buf_phys_addr_hi = 0;
         ldio->sense_buf_phys_addr_lo = cmd->sense_phys_addr;
 
         /*
          * Compute the total number of frames this command consumes. FW uses
          * this number to pull sufficient number of frames from host memory.
          */
         cmd->frame_count = megasas_get_frame_count(instance,
                         ldio->sge_count, IO_FRAME);
 
         return cmd->frame_count;
 }
 
 /**
  * megasas_is_ldio -            Checks if the cmd is for logical drive
  * @scmd:                       SCSI command
  *      
  * Called by megasas_queue_command to find out if the command to be queued
  * is a logical drive command   
  */
 static inline int megasas_is_ldio(struct scsi_cmnd *cmd)
 {
         if (!MEGASAS_IS_LOGICAL(cmd))
                 return 0;
         switch (cmd->cmnd[0]) {
         case READ_10:
         case WRITE_10:
         case READ_12:
         case WRITE_12:
         case READ_6:
         case WRITE_6:
         case READ_16:
         case WRITE_16:
                 return 1;
         default:
                 return 0;
         }
 }
 
  /**
  * megasas_dump_pending_frames -        Dumps the frame address of all pending cmds
  *                                      in FW
  * @instance:                           Adapter soft state
  */
 static inline void
 megasas_dump_pending_frames(struct megasas_instance *instance)
 {
         struct megasas_cmd *cmd;
         int i,n;
         union megasas_sgl *mfi_sgl;
         struct megasas_io_frame *ldio;
         struct megasas_pthru_frame *pthru;
         u32 sgcount;
         u32 max_cmd = instance->max_fw_cmds;
 
         printk(KERN_ERR "\nmegasas[%d]: Dumping Frame Phys Address of all pending cmds in FW\n",instance->host->host_no);
         printk(KERN_ERR "megasas[%d]: Total OS Pending cmds : %d\n",instance->host->host_no,atomic_read(&instance->fw_outstanding));
         if (IS_DMA64)
                 printk(KERN_ERR "\nmegasas[%d]: 64 bit SGLs were sent to FW\n",instance->host->host_no);
         else
                 printk(KERN_ERR "\nmegasas[%d]: 32 bit SGLs were sent to FW\n",instance->host->host_no);
 
         printk(KERN_ERR "megasas[%d]: Pending OS cmds in FW : \n",instance->host->host_no);
         for (i = 0; i < max_cmd; i++) {
                 cmd = instance->cmd_list[i];
                 if(!cmd->scmd)
                         continue;
                 printk(KERN_ERR "megasas[%d]: Frame addr :0x%08lx : ",instance->host->host_no,(unsigned long)cmd->frame_phys_addr);
                 if (megasas_is_ldio(cmd->scmd)){
                         ldio = (struct megasas_io_frame *)cmd->frame;
                         mfi_sgl = &ldio->sgl;
                         sgcount = ldio->sge_count;
                         printk(KERN_ERR "megasas[%d]: frame count : 0x%x, Cmd : 0x%x, Tgt id : 0x%x, lba lo : 0x%x, lba_hi : 0x%x, sense_buf addr : 0x%x,sge count : 0x%x\n",instance->host->host_no, cmd->frame_count,ldio->cmd,ldio->target_id, ldio->start_lba_lo,ldio->start_lba_hi,ldio->sense_buf_phys_addr_lo,sgcount);
                 }
                 else {
                         pthru = (struct megasas_pthru_frame *) cmd->frame;
                         mfi_sgl = &pthru->sgl;
                         sgcount = pthru->sge_count;
                         printk(KERN_ERR "megasas[%d]: frame count : 0x%x, Cmd : 0x%x, Tgt id : 0x%x, lun : 0x%x, cdb_len : 0x%x, data xfer len : 0x%x, sense_buf addr : 0x%x,sge count : 0x%x\n",instance->host->host_no,cmd->frame_count,pthru->cmd,pthru->target_id,pthru->lun,pthru->cdb_len , pthru->data_xfer_len,pthru->sense_buf_phys_addr_lo,sgcount);
                 }
         if(megasas_dbg_lvl & MEGASAS_DBG_LVL){
                 for (n = 0; n < sgcount; n++){
                         if (IS_DMA64)
                                 printk(KERN_ERR "megasas: sgl len : 0x%x, sgl addr : 0x%08lx ",mfi_sgl->sge64[n].length , (unsigned long)mfi_sgl->sge64[n].phys_addr) ;
                         else
                                 printk(KERN_ERR "megasas: sgl len : 0x%x, sgl addr : 0x%x ",mfi_sgl->sge32[n].length , mfi_sgl->sge32[n].phys_addr) ;
                         }
                 }
                 printk(KERN_ERR "\n");
         } /*for max_cmd*/
         printk(KERN_ERR "\nmegasas[%d]: Pending Internal cmds in FW : \n",instance->host->host_no);
         for (i = 0; i < max_cmd; i++) {
 
                 cmd = instance->cmd_list[i];
 
                 if(cmd->sync_cmd == 1){
                         printk(KERN_ERR "0x%08lx : ", (unsigned long)cmd->frame_phys_addr);
                 }
         }
         printk(KERN_ERR "megasas[%d]: Dumping Done.\n\n",instance->host->host_no);
 }
 
 /**
  * megasas_queue_command -      Queue entry point
  * @scmd:                       SCSI command to be queued
  * @done:                       Callback entry point
  */
 static int
 megasas_queue_command(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd *))
 {
         u32 frame_count;
         struct megasas_cmd *cmd;
         struct megasas_instance *instance;
 
         instance = (struct megasas_instance *)
             scmd->device->host->hostdata;
 
         /* Don't process if we have already declared adapter dead */
         if (instance->hw_crit_error)
                 return SCSI_MLQUEUE_HOST_BUSY;
 
         scmd->scsi_done = done;
         scmd->result = 0;
 
         if (MEGASAS_IS_LOGICAL(scmd) &&
             (scmd->device->id >= MEGASAS_MAX_LD || scmd->device->lun)) {
                 scmd->result = DID_BAD_TARGET << 16;
                 goto out_done;
         }
 
         switch (scmd->cmnd[0]) {
         case SYNCHRONIZE_CACHE:
                 /*
                  * FW takes care of flush cache on its own
                  * No need to send it down
                  */
                 scmd->result = DID_OK << 16;
                 goto out_done;
         default:
                 break;
         }
 
         cmd = megasas_get_cmd(instance);
         if (!cmd)
                 return SCSI_MLQUEUE_HOST_BUSY;
 
         /*
          * Logical drive command
          */
         if (megasas_is_ldio(scmd))
                 frame_count = megasas_build_ldio(instance, scmd, cmd);
         else
                 frame_count = megasas_build_dcdb(instance, scmd, cmd);
 
         if (!frame_count)
                 goto out_return_cmd;
 
         cmd->scmd = scmd;
         scmd->SCp.ptr = (char *)cmd;
 
         /*
          * Issue the command to the FW
          */
         atomic_inc(&instance->fw_outstanding);
 
         instance->instancet->fire_cmd(instance, cmd->frame_phys_addr,
                                 cmd->frame_count-1, instance->reg_set);
         /*
          * Check if we have pend cmds to be completed
          */
         if (poll_mode_io && atomic_read(&instance->fw_outstanding))
                 tasklet_schedule(&instance->isr_tasklet);
 
 
         return 0;
 
  out_return_cmd:
         megasas_return_cmd(instance, cmd);
  out_done:
         done(scmd);
         return 0;
 }
 
 static struct megasas_instance *megasas_lookup_instance(u16 host_no)
 {
         int i;
 
         for (i = 0; i < megasas_mgmt_info.max_index; i++) {
 
                 if ((megasas_mgmt_info.instance[i]) &&
                     (megasas_mgmt_info.instance[i]->host->host_no == host_no))
                         return megasas_mgmt_info.instance[i];
         }
 
         return NULL;
 }
 
 static int megasas_slave_configure(struct scsi_device *sdev)
 {
         u16             pd_index = 0;
         struct  megasas_instance *instance ;
 
         instance = megasas_lookup_instance(sdev->host->host_no);
 
         /*
         * Don't export physical disk devices to the disk driver.
         *
         * FIXME: Currently we don't export them to the midlayer at all.
         *        That will be fixed once LSI engineers have audited the
         *        firmware for possible issues.
         */
         if (sdev->channel < MEGASAS_MAX_PD_CHANNELS &&
                                 sdev->type == TYPE_DISK) {
                 pd_index = (sdev->channel * MEGASAS_MAX_DEV_PER_CHANNEL) +
                                                                 sdev->id;
                 if (instance->pd_list[pd_index].driveState ==
                                                 MR_PD_STATE_SYSTEM) {
                         blk_queue_rq_timeout(sdev->request_queue,
                                 MEGASAS_DEFAULT_CMD_TIMEOUT * HZ);
                         return 0;
                 }
                 return -ENXIO;
         }
 
         /*
         * The RAID firmware may require extended timeouts.
         */
         blk_queue_rq_timeout(sdev->request_queue,
                 MEGASAS_DEFAULT_CMD_TIMEOUT * HZ);
         return 0;
 }
 
 static int megasas_slave_alloc(struct scsi_device *sdev)
 {
         u16             pd_index = 0;
         struct megasas_instance *instance ;
         instance = megasas_lookup_instance(sdev->host->host_no);
         if ((sdev->channel < MEGASAS_MAX_PD_CHANNELS) &&
                                 (sdev->type == TYPE_DISK)) {
                 /*
                  * Open the OS scan to the SYSTEM PD
                  */
                 pd_index =
                         (sdev->channel * MEGASAS_MAX_DEV_PER_CHANNEL) +
                         sdev->id;
                 if ((instance->pd_list[pd_index].driveState ==
                                         MR_PD_STATE_SYSTEM) &&
                         (instance->pd_list[pd_index].driveType ==
                                                 TYPE_DISK)) {
                         return 0;
                 }
                 return -ENXIO;
         }
         return 0;
 }
 
 /**
  * megasas_complete_cmd_dpc      -      Returns FW's controller structure
  * @instance_addr:                      Address of adapter soft state
  *
  * Tasklet to complete cmds
  */
 static void megasas_complete_cmd_dpc(unsigned long instance_addr)
 {
         u32 producer;
         u32 consumer;
         u32 context;
         struct megasas_cmd *cmd;
         struct megasas_instance *instance =
                                 (struct megasas_instance *)instance_addr;
         unsigned long flags;
 
         /* If we have already declared adapter dead, donot complete cmds */
         if (instance->hw_crit_error)
                 return;
 
         spin_lock_irqsave(&instance->completion_lock, flags);
 
         producer = *instance->producer;
         consumer = *instance->consumer;
 
         while (consumer != producer) {
                 context = instance->reply_queue[consumer];
 
                 cmd = instance->cmd_list[context];
 
                 megasas_complete_cmd(instance, cmd, DID_OK);
 
                 consumer++;
                 if (consumer == (instance->max_fw_cmds + 1)) {
                         consumer = 0;
                 }
         }
 
         *instance->consumer = producer;
 
         spin_unlock_irqrestore(&instance->completion_lock, flags);
 
         /*
          * Check if we can restore can_queue
          */
         if (instance->flag & MEGASAS_FW_BUSY
                 && time_after(jiffies, instance->last_time + 5 * HZ)
                 && atomic_read(&instance->fw_outstanding) < 17) {
 
                 spin_lock_irqsave(instance->host->host_lock, flags);
                 instance->flag &= ~MEGASAS_FW_BUSY;
                 if ((instance->pdev->device ==
                         PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
                         (instance->pdev->device ==
                         PCI_DEVICE_ID_LSI_SAS0071SKINNY)) {
                         instance->host->can_queue =
                                 instance->max_fw_cmds - MEGASAS_SKINNY_INT_CMDS;
                 } else
                         instance->host->can_queue =
                                 instance->max_fw_cmds - MEGASAS_INT_CMDS;
 
                 spin_unlock_irqrestore(instance->host->host_lock, flags);
         }
 }
 
 /**
  * megasas_wait_for_outstanding -       Wait for all outstanding cmds
  * @instance:                           Adapter soft state
  *
  * This function waits for upto MEGASAS_RESET_WAIT_TIME seconds for FW to
  * complete all its outstanding commands. Returns error if one or more IOs
  * are pending after this time period. It also marks the controller dead.
  */
 static int megasas_wait_for_outstanding(struct megasas_instance *instance)
 {
         int i;
         u32 wait_time = MEGASAS_RESET_WAIT_TIME;
 
         for (i = 0; i < wait_time; i++) {
 
                 int outstanding = atomic_read(&instance->fw_outstanding);
 
                 if (!outstanding)
                         break;
 
                 if (!(i % MEGASAS_RESET_NOTICE_INTERVAL)) {
                         printk(KERN_NOTICE "megasas: [%2d]waiting for %d "
                                "commands to complete\n",i,outstanding);
                         /*
                          * Call cmd completion routine. Cmd to be
                          * be completed directly without depending on isr.
                          */
                         megasas_complete_cmd_dpc((unsigned long)instance);
                 }
 
                 msleep(1000);
         }
 
         if (atomic_read(&instance->fw_outstanding)) {
                 /*
                 * Send signal to FW to stop processing any pending cmds.
                 * The controller will be taken offline by the OS now.
                 */
                 if ((instance->pdev->device ==
                         PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
                         (instance->pdev->device ==
                         PCI_DEVICE_ID_LSI_SAS0071SKINNY)) {
                         writel(MFI_STOP_ADP,
                                 &instance->reg_set->reserved_0[0]);
                 } else {
                         writel(MFI_STOP_ADP,
                                 &instance->reg_set->inbound_doorbell);
                 }
                 megasas_dump_pending_frames(instance);
                 instance->hw_crit_error = 1;
                 return FAILED;
         }
 
         return SUCCESS;
 }
 
 /**
  * megasas_generic_reset -      Generic reset routine
  * @scmd:                       Mid-layer SCSI command
  *
  * This routine implements a generic reset handler for device, bus and host
  * reset requests. Device, bus and host specific reset handlers can use this
  * function after they do their specific tasks.
  */
 static int megasas_generic_reset(struct scsi_cmnd *scmd)
 {
         int ret_val;
         struct megasas_instance *instance;
 
         instance = (struct megasas_instance *)scmd->device->host->hostdata;
 
         scmd_printk(KERN_NOTICE, scmd, "megasas: RESET -%ld cmd=%x retries=%x\n",
                  scmd->serial_number, scmd->cmnd[0], scmd->retries);
 
         if (instance->hw_crit_error) {
                 printk(KERN_ERR "megasas: cannot recover from previous reset "
                        "failures\n");
                 return FAILED;
         }
 
         ret_val = megasas_wait_for_outstanding(instance);
         if (ret_val == SUCCESS)
                 printk(KERN_NOTICE "megasas: reset successful \n");
         else
                 printk(KERN_ERR "megasas: failed to do reset\n");
 
         return ret_val;
 }
 
 /**
  * megasas_reset_timer - quiesce the adapter if required
  * @scmd:               scsi cmnd
  *
  * Sets the FW busy flag and reduces the host->can_queue if the
  * cmd has not been completed within the timeout period.
  */
 static enum
 blk_eh_timer_return megasas_reset_timer(struct scsi_cmnd *scmd)
 {
         struct megasas_cmd *cmd = (struct megasas_cmd *)scmd->SCp.ptr;
         struct megasas_instance *instance;
         unsigned long flags;
 
         if (time_after(jiffies, scmd->jiffies_at_alloc +
                                 (MEGASAS_DEFAULT_CMD_TIMEOUT * 2) * HZ)) {
                 return BLK_EH_NOT_HANDLED;
         }
 
         instance = cmd->instance;
         if (!(instance->flag & MEGASAS_FW_BUSY)) {
                 /* FW is busy, throttle IO */
                 spin_lock_irqsave(instance->host->host_lock, flags);
 
                 instance->host->can_queue = 16;
                 instance->last_time = jiffies;
                 instance->flag |= MEGASAS_FW_BUSY;
 
                 spin_unlock_irqrestore(instance->host->host_lock, flags);
         }
         return BLK_EH_RESET_TIMER;
 }
 
 /**
  * megasas_reset_device -       Device reset handler entry point
  */
 static int megasas_reset_device(struct scsi_cmnd *scmd)
 {
         int ret;
 
         /*
          * First wait for all commands to complete
          */
         ret = megasas_generic_reset(scmd);
 
         return ret;
 }
 
 /**
  * megasas_reset_bus_host -     Bus & host reset handler entry point
  */
 static int megasas_reset_bus_host(struct scsi_cmnd *scmd)
 {
         int ret;
 
         /*
          * First wait for all commands to complete
          */
         ret = megasas_generic_reset(scmd);
 
         return ret;
 }
 
 /**
  * megasas_bios_param - Returns disk geometry for a disk
  * @sdev:               device handle
  * @bdev:               block device
  * @capacity:           drive capacity
  * @geom:               geometry parameters
  */
 static int
 megasas_bios_param(struct scsi_device *sdev, struct block_device *bdev,
                  sector_t capacity, int geom[])
 {
         int heads;
         int sectors;
         sector_t cylinders;
         unsigned long tmp;
         /* Default heads (64) & sectors (32) */
         heads = 64;
         sectors = 32;
 
         tmp = heads * sectors;
         cylinders = capacity;
 
         sector_div(cylinders, tmp);
 
         /*
          * Handle extended translation size for logical drives > 1Gb
          */
 
         if (capacity >= 0x200000) {
                 heads = 255;
                 sectors = 63;
                 tmp = heads*sectors;
                 cylinders = capacity;
                 sector_div(cylinders, tmp);
         }
 
         geom[0] = heads;
         geom[1] = sectors;
         geom[2] = cylinders;
 
         return 0;
 }
 
 static void megasas_aen_polling(struct work_struct *work);
 
 /**
  * megasas_service_aen -        Processes an event notification
  * @instance:                   Adapter soft state
  * @cmd:                        AEN command completed by the ISR
  *
  * For AEN, driver sends a command down to FW that is held by the FW till an
  * event occurs. When an event of interest occurs, FW completes the command
  * that it was previously holding.
  *
  * This routines sends SIGIO signal to processes that have registered with the
  * driver for AEN.
  */
 static void
 megasas_service_aen(struct megasas_instance *instance, struct megasas_cmd *cmd)
 {
         unsigned long flags;
         /*
          * Don't signal app if it is just an aborted previously registered aen
          */
         if ((!cmd->abort_aen) && (instance->unload == 0)) {
                 spin_lock_irqsave(&poll_aen_lock, flags);
                 megasas_poll_wait_aen = 1;
                 spin_unlock_irqrestore(&poll_aen_lock, flags);
                 wake_up(&megasas_poll_wait);
                 kill_fasync(&megasas_async_queue, SIGIO, POLL_IN);
         }
         else
                 cmd->abort_aen = 0;
 
         instance->aen_cmd = NULL;
         megasas_return_cmd(instance, cmd);
 
         if (instance->unload == 0) {
                 struct megasas_aen_event *ev;
                 ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
                 if (!ev) {
                         printk(KERN_ERR "megasas_service_aen: out of memory\n");
                 } else {
                         ev->instance = instance;
                         instance->ev = ev;
                         INIT_WORK(&ev->hotplug_work, megasas_aen_polling);
                         schedule_delayed_work(
                                 (struct delayed_work *)&ev->hotplug_work, 0);
                 }
         }
 }
 
 /*
  * Scsi host template for megaraid_sas driver
  */
 static struct scsi_host_template megasas_template = {
 
         .module = THIS_MODULE,
         .name = "LSI SAS based MegaRAID driver",
         .proc_name = "megaraid_sas",
         .slave_configure = megasas_slave_configure,
         .slave_alloc = megasas_slave_alloc,
         .queuecommand = megasas_queue_command,
         .eh_device_reset_handler = megasas_reset_device,
         .eh_bus_reset_handler = megasas_reset_bus_host,
         .eh_host_reset_handler = megasas_reset_bus_host,
         .eh_timed_out = megasas_reset_timer,
         .bios_param = megasas_bios_param,
         .use_clustering = ENABLE_CLUSTERING,
 };
 
 /**
  * megasas_complete_int_cmd -   Completes an internal command
  * @instance:                   Adapter soft state
  * @cmd:                        Command to be completed
  *
  * The megasas_issue_blocked_cmd() function waits for a command to complete
  * after it issues a command. This function wakes up that waiting routine by
  * calling wake_up() on the wait queue.
  */
 static void
 megasas_complete_int_cmd(struct megasas_instance *instance,
                          struct megasas_cmd *cmd)
 {
         cmd->cmd_status = cmd->frame->io.cmd_status;
 
         if (cmd->cmd_status == ENODATA) {
                 cmd->cmd_status = 0;
         }
         wake_up(&instance->int_cmd_wait_q);
 }
 
 /**
  * megasas_complete_abort -     Completes aborting a command
  * @instance:                   Adapter soft state
  * @cmd:                        Cmd that was issued to abort another cmd
  *
  * The megasas_issue_blocked_abort_cmd() function waits on abort_cmd_wait_q 
  * after it issues an abort on a previously issued command. This function 
  * wakes up all functions waiting on the same wait queue.
  */
 static void
 megasas_complete_abort(struct megasas_instance *instance,
                        struct megasas_cmd *cmd)
 {
         if (cmd->sync_cmd) {
                 cmd->sync_cmd = 0;
                 cmd->cmd_status = 0;
                 wake_up(&instance->abort_cmd_wait_q);
         }
 
         return;
 }
 
 /**
  * megasas_complete_cmd -       Completes a command
  * @instance:                   Adapter soft state
  * @cmd:                        Command to be completed
  * @alt_status:                 If non-zero, use this value as status to 
  *                              SCSI mid-layer instead of the value returned
  *                              by the FW. This should be used if caller wants
  *                              an alternate status (as in the case of aborted
  *                              commands)
  */
 static void
 megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
                      u8 alt_status)
 {
         int exception = 0;
         struct megasas_header *hdr = &cmd->frame->hdr;
         unsigned long flags;
 
         if (cmd->scmd)
                 cmd->scmd->SCp.ptr = NULL;
 
         switch (hdr->cmd) {
 
         case MFI_CMD_PD_SCSI_IO:
         case MFI_CMD_LD_SCSI_IO:
 
                 /*
                  * MFI_CMD_PD_SCSI_IO and MFI_CMD_LD_SCSI_IO could have been
                  * issued either through an IO path or an IOCTL path. If it
                  * was via IOCTL, we will send it to internal completion.
                  */
                 if (cmd->sync_cmd) {
                         cmd->sync_cmd = 0;
                         megasas_complete_int_cmd(instance, cmd);
                         break;
                 }
 
         case MFI_CMD_LD_READ:
         case MFI_CMD_LD_WRITE:
 
                 if (alt_status) {
                         cmd->scmd->result = alt_status << 16;
                         exception = 1;
                 }
 
                 if (exception) {
 
                         atomic_dec(&instance->fw_outstanding);
 
                         scsi_dma_unmap(cmd->scmd);
                         cmd->scmd->scsi_done(cmd->scmd);
                         megasas_return_cmd(instance, cmd);
 
                         break;
                 }
 
                 switch (hdr->cmd_status) {
 
                 case MFI_STAT_OK:
                         cmd->scmd->result = DID_OK << 16;
                         break;
 
                 case MFI_STAT_SCSI_IO_FAILED:
                 case MFI_STAT_LD_INIT_IN_PROGRESS:
                         cmd->scmd->result =
                             (DID_ERROR << 16) | hdr->scsi_status;
                         break;
 
                 case MFI_STAT_SCSI_DONE_WITH_ERROR:
 
                         cmd->scmd->result = (DID_OK << 16) | hdr->scsi_status;
 
                         if (hdr->scsi_status == SAM_STAT_CHECK_CONDITION) {
                                 memset(cmd->scmd->sense_buffer, 0,
                                        SCSI_SENSE_BUFFERSIZE);
                                 memcpy(cmd->scmd->sense_buffer, cmd->sense,
                                        hdr->sense_len);
 
                                 cmd->scmd->result |= DRIVER_SENSE << 24;
                         }
 
                         break;
 
                 case MFI_STAT_LD_OFFLINE:
                 case MFI_STAT_DEVICE_NOT_FOUND:
                         cmd->scmd->result = DID_BAD_TARGET << 16;
                         break;
 
                 default:
                         printk(KERN_DEBUG "megasas: MFI FW status %#x\n",
                                hdr->cmd_status);
                         cmd->scmd->result = DID_ERROR << 16;
                         break;
                 }
 
                 atomic_dec(&instance->fw_outstanding);
 
                 scsi_dma_unmap(cmd->scmd);
                 cmd->scmd->scsi_done(cmd->scmd);
                 megasas_return_cmd(instance, cmd);
 
                 break;
 
         case MFI_CMD_SMP:
         case MFI_CMD_STP:
         case MFI_CMD_DCMD:
                 if (cmd->frame->dcmd.opcode == MR_DCMD_CTRL_EVENT_GET_INFO ||
                         cmd->frame->dcmd.opcode == MR_DCMD_CTRL_EVENT_GET) {
                         spin_lock_irqsave(&poll_aen_lock, flags);
                         megasas_poll_wait_aen = 0;
                         spin_unlock_irqrestore(&poll_aen_lock, flags);
                 }
 
                 /*
                  * See if got an event notification
                  */
                 if (cmd->frame->dcmd.opcode == MR_DCMD_CTRL_EVENT_WAIT)
                         megasas_service_aen(instance, cmd);
                 else
                         megasas_complete_int_cmd(instance, cmd);
 
                 break;
 
         case MFI_CMD_ABORT:
                 /*
                  * Cmd issued to abort another cmd returned
                  */
                 megasas_complete_abort(instance, cmd);
                 break;
 
         default:
                 printk("megasas: Unknown command completed! [0x%X]\n",
                        hdr->cmd);
                 break;
         }
 }
 
 /**
  * megasas_deplete_reply_queue -        Processes all completed commands
  * @instance:                           Adapter soft state
  * @alt_status:                         Alternate status to be returned to
  *                                      SCSI mid-layer instead of the status
  *                                      returned by the FW
  */
 static int
 megasas_deplete_reply_queue(struct megasas_instance *instance, u8 alt_status)
 {
         /*
          * Check if it is our interrupt
          * Clear the interrupt 
          */
         if(instance->instancet->clear_intr(instance->reg_set))
                 return IRQ_NONE;
 
         if (instance->hw_crit_error)
                 goto out_done;
         /*
          * Schedule the tasklet for cmd completion
          */
         tasklet_schedule(&instance->isr_tasklet);
 out_done:
         return IRQ_HANDLED;
 }
 
 /**
  * megasas_isr - isr entry point
  */
 static irqreturn_t megasas_isr(int irq, void *devp)
 {
         return megasas_deplete_reply_queue((struct megasas_instance *)devp,
                                            DID_OK);
 }
 
 /**
  * megasas_transition_to_ready -        Move the FW to READY state
  * @instance:                           Adapter soft state
  *
  * During the initialization, FW passes can potentially be in any one of
  * several possible states. If the FW in operational, waiting-for-handshake
  * states, driver must take steps to bring it to ready state. Otherwise, it
  * has to wait for the ready state.
  */
 static int
 megasas_transition_to_ready(struct megasas_instance* instance)
 {
         int i;
         u8 max_wait;
         u32 fw_state;
         u32 cur_state;
         u32 abs_state, curr_abs_state;
 
         fw_state = instance->instancet->read_fw_status_reg(instance->reg_set) & MFI_STATE_MASK;
 
         if (fw_state != MFI_STATE_READY)
                 printk(KERN_INFO "megasas: Waiting for FW to come to ready"
                        " state\n");
 
         while (fw_state != MFI_STATE_READY) {
 
                 abs_state =
                 instance->instancet->read_fw_status_reg(instance->reg_set);
 
                 switch (fw_state) {
 
                 case MFI_STATE_FAULT:
 
                         printk(KERN_DEBUG "megasas: FW in FAULT state!!\n");
                         return -ENODEV;
 
                 case MFI_STATE_WAIT_HANDSHAKE:
                         /*
                          * Set the CLR bit in inbound doorbell
                          */
                         if ((instance->pdev->device ==
                                 PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
                                 (instance->pdev->device ==
                                 PCI_DEVICE_ID_LSI_SAS0071SKINNY)) {
 
                                 writel(
                                   MFI_INIT_CLEAR_HANDSHAKE|MFI_INIT_HOTPLUG,
                                   &instance->reg_set->reserved_0[0]);
                         } else {
                                 writel(
                                     MFI_INIT_CLEAR_HANDSHAKE|MFI_INIT_HOTPLUG,
                                         &instance->reg_set->inbound_doorbell);
                         }
 
                         max_wait = MEGASAS_RESET_WAIT_TIME;
                         cur_state = MFI_STATE_WAIT_HANDSHAKE;
                         break;
 
                 case MFI_STATE_BOOT_MESSAGE_PENDING:
                         if ((instance->pdev->device ==
                                 PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
                         (instance->pdev->device ==
                                 PCI_DEVICE_ID_LSI_SAS0071SKINNY)) {
                                 writel(MFI_INIT_HOTPLUG,
                                 &instance->reg_set->reserved_0[0]);
                         } else
                                 writel(MFI_INIT_HOTPLUG,
                                         &instance->reg_set->inbound_doorbell);
 
                         max_wait = MEGASAS_RESET_WAIT_TIME;
                         cur_state = MFI_STATE_BOOT_MESSAGE_PENDING;
                         break;
 
                 case MFI_STATE_OPERATIONAL:
                         /*
                          * Bring it to READY state; assuming max wait 10 secs
                          */
                         instance->instancet->disable_intr(instance->reg_set);
                         if ((instance->pdev->device ==
                                 PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
                                 (instance->pdev->device ==
                                 PCI_DEVICE_ID_LSI_SAS0071SKINNY)) {
                                 writel(MFI_RESET_FLAGS,
                                         &instance->reg_set->reserved_0[0]);
                         } else
                                 writel(MFI_RESET_FLAGS,
                                         &instance->reg_set->inbound_doorbell);
 
                         max_wait = MEGASAS_RESET_WAIT_TIME;
                         cur_state = MFI_STATE_OPERATIONAL;
                         break;
 
                 case MFI_STATE_UNDEFINED:
                         /*
                          * This state should not last for more than 2 seconds
                          */
                         max_wait = MEGASAS_RESET_WAIT_TIME;
                         cur_state = MFI_STATE_UNDEFINED;
                         break;
 
                 case MFI_STATE_BB_INIT:
                         max_wait = MEGASAS_RESET_WAIT_TIME;
                         cur_state = MFI_STATE_BB_INIT;
                         break;
 
                 case MFI_STATE_FW_INIT:
                         max_wait = MEGASAS_RESET_WAIT_TIME;
                         cur_state = MFI_STATE_FW_INIT;
                         break;
 
                 case MFI_STATE_FW_INIT_2:
                         max_wait = MEGASAS_RESET_WAIT_TIME;
                         cur_state = MFI_STATE_FW_INIT_2;
                         break;
 
                 case MFI_STATE_DEVICE_SCAN:
                         max_wait = MEGASAS_RESET_WAIT_TIME;
                         cur_state = MFI_STATE_DEVICE_SCAN;
                         break;
 
                 case MFI_STATE_FLUSH_CACHE:
                         max_wait = MEGASAS_RESET_WAIT_TIME;
                         cur_state = MFI_STATE_FLUSH_CACHE;
                         break;
 
                 default:
                         printk(KERN_DEBUG "megasas: Unknown state 0x%x\n",
                                fw_state);
                         return -ENODEV;
                 }
 
                 /*
                  * The cur_state should not last for more than max_wait secs
                  */
                 for (i = 0; i < (max_wait * 1000); i++) {
                         fw_state = instance->instancet->read_fw_status_reg(instance->reg_set) &  
                                         MFI_STATE_MASK ;
                 curr_abs_state =
                 instance->instancet->read_fw_status_reg(instance->reg_set);
 
                         if (abs_state == curr_abs_state) {
                                 msleep(1);
                         } else
                                 break;
                 }
 
                 /*
                  * Return error if fw_state hasn't changed after max_wait
                  */
                 if (curr_abs_state == abs_state) {
                         printk(KERN_DEBUG "FW state [%d] hasn't changed "
                                "in %d secs\n", fw_state, max_wait);
                         return -ENODEV;
                 }
         };
         printk(KERN_INFO "megasas: FW now in Ready state\n");
 
         return 0;
 }
 
 /**
  * megasas_teardown_frame_pool -        Destroy the cmd frame DMA pool
  * @instance:                           Adapter soft state
  */
 static void megasas_teardown_frame_pool(struct megasas_instance *instance)
 {
         int i;
         u32 max_cmd = instance->max_fw_cmds;
         struct megasas_cmd *cmd;
 
         if (!instance->frame_dma_pool)
                 return;
 
         /*
          * Return all frames to pool
          */
         for (i = 0; i < max_cmd; i++) {
 
                 cmd = instance->cmd_list[i];
 
                 if (cmd->frame)
                         pci_pool_free(instance->frame_dma_pool, cmd->frame,
                                       cmd->frame_phys_addr);
 
                 if (cmd->sense)
                         pci_pool_free(instance->sense_dma_pool, cmd->sense,
                                       cmd->sense_phys_addr);
         }
 
         /*
          * Now destroy the pool itself
          */
         pci_pool_destroy(instance->frame_dma_pool);
         pci_pool_destroy(instance->sense_dma_pool);
 
         instance->frame_dma_pool = NULL;
         instance->sense_dma_pool = NULL;
 }
 
 /**
  * megasas_create_frame_pool -  Creates DMA pool for cmd frames
  * @instance:                   Adapter soft state
  *
  * Each command packet has an embedded DMA memory buffer that is used for
  * filling MFI frame and the SG list that immediately follows the frame. This
  * function creates those DMA memory buffers for each command packet by using
  * PCI pool facility.
  */
 static int megasas_create_frame_pool(struct megasas_instance *instance)
 {
         int i;
         u32 max_cmd;
         u32 sge_sz;
         u32 sgl_sz;
         u32 total_sz;
         u32 frame_count;
         struct megasas_cmd *cmd;
 
         max_cmd = instance->max_fw_cmds;
 
         /*
          * Size of our frame is 64 bytes for MFI frame, followed by max SG
          * elements and finally SCSI_SENSE_BUFFERSIZE bytes for sense buffer
          */
         sge_sz = (IS_DMA64) ? sizeof(struct megasas_sge64) :
             sizeof(struct megasas_sge32);
 
         if (instance->flag_ieee) {
                 sge_sz = sizeof(struct megasas_sge_skinny);
         }
 
         /*
          * Calculated the number of 64byte frames required for SGL
          */
         sgl_sz = sge_sz * instance->max_num_sge;
         frame_count = (sgl_sz + MEGAMFI_FRAME_SIZE - 1) / MEGAMFI_FRAME_SIZE;
 
         /*
          * We need one extra frame for the MFI command
          */
         frame_count++;
 
         total_sz = MEGAMFI_FRAME_SIZE * frame_count;
         /*
          * Use DMA pool facility provided by PCI layer
          */
         instance->frame_dma_pool = pci_pool_create("megasas frame pool",
                                                    instance->pdev, total_sz, 64,
                                                    0);
 
         if (!instance->frame_dma_pool) {
                 printk(KERN_DEBUG "megasas: failed to setup frame pool\n");
                 return -ENOMEM;
         }
 
         instance->sense_dma_pool = pci_pool_create("megasas sense pool",
                                                    instance->pdev, 128, 4, 0);
 
         if (!instance->sense_dma_pool) {
                 printk(KERN_DEBUG "megasas: failed to setup sense pool\n");
 
                 pci_pool_destroy(instance->frame_dma_pool);
                 instance->frame_dma_pool = NULL;
 
                 return -ENOMEM;
         }
 
         /*
          * Allocate and attach a frame to each of the commands in cmd_list.
          * By making cmd->index as the context instead of the &cmd, we can
          * always use 32bit context regardless of the architecture
          */
         for (i = 0; i < max_cmd; i++) {
 
                 cmd = instance->cmd_list[i];
 
                 cmd->frame = pci_pool_alloc(instance->frame_dma_pool,
                                             GFP_KERNEL, &cmd->frame_phys_addr);
 
                 cmd->sense = pci_pool_alloc(instance->sense_dma_pool,
                                             GFP_KERNEL, &cmd->sense_phys_addr);
 
                 /*
                  * megasas_teardown_frame_pool() takes care of freeing
                  * whatever has been allocated
                  */
                 if (!cmd->frame || !cmd->sense) {
                         printk(KERN_DEBUG "megasas: pci_pool_alloc failed \n");
                         megasas_teardown_frame_pool(instance);
                         return -ENOMEM;
                 }
 
                 cmd->frame->io.context = cmd->index;
                 cmd->frame->io.pad_0 = 0;
         }
 
         return 0;
 }
 
 /**
  * megasas_free_cmds -  Free all the cmds in the free cmd pool
  * @instance:           Adapter soft state
  */
 static void megasas_free_cmds(struct megasas_instance *instance)
 {
         int i;
         /* First free the MFI frame pool */
         megasas_teardown_frame_pool(instance);
 
         /* Free all the commands in the cmd_list */
         for (i = 0; i < instance->max_fw_cmds; i++)
                 kfree(instance->cmd_list[i]);
 
         /* Free the cmd_list buffer itself */
         kfree(instance->cmd_list);
         instance->cmd_list = NULL;
 
         INIT_LIST_HEAD(&instance->cmd_pool);
 }
 
 /**
  * megasas_alloc_cmds - Allocates the command packets
  * @instance:           Adapter soft state
  *
  * Each command that is issued to the FW, whether IO commands from the OS or
  * internal commands like IOCTLs, are wrapped in local data structure called
  * megasas_cmd. The frame embedded in this megasas_cmd is actually issued to
  * the FW.
  *
  * Each frame has a 32-bit field called context (tag). This context is used
  * to get back the megasas_cmd from the frame when a frame gets completed in
  * the ISR. Typically the address of the megasas_cmd itself would be used as
  * the context. But we wanted to keep the differences between 32 and 64 bit
  * systems to the mininum. We always use 32 bit integers for the context. In
  * this driver, the 32 bit values are the indices into an array cmd_list.
  * This array is used only to look up the megasas_cmd given the context. The
  * free commands themselves are maintained in a linked list called cmd_pool.
  */
 static int megasas_alloc_cmds(struct megasas_instance *instance)
 {
         int i;
         int j;
         u32 max_cmd;
         struct megasas_cmd *cmd;
 
         max_cmd = instance->max_fw_cmds;
 
         /*
          * instance->cmd_list is an array of struct megasas_cmd pointers.
          * Allocate the dynamic array first and then allocate individual
          * commands.
          */
         instance->cmd_list = kcalloc(max_cmd, sizeof(struct megasas_cmd*), GFP_KERNEL);
 
         if (!instance->cmd_list) {
                 printk(KERN_DEBUG "megasas: out of memory\n");
                 return -ENOMEM;
         }
 
 
         for (i = 0; i < max_cmd; i++) {
                 instance->cmd_list[i] = kmalloc(sizeof(struct megasas_cmd),
                                                 GFP_KERNEL);
 
                 if (!instance->cmd_list[i]) {
 
                         for (j = 0; j < i; j++)
                                 kfree(instance->cmd_list[j]);
 
                         kfree(instance->cmd_list);
                         instance->cmd_list = NULL;
 
                         return -ENOMEM;
                 }
         }
 
         /*
          * Add all the commands to command pool (instance->cmd_pool)
          */
         for (i = 0; i < max_cmd; i++) {
                 cmd = instance->cmd_list[i];
                 memset(cmd, 0, sizeof(struct megasas_cmd));
                 cmd->index = i;
                 cmd->instance = instance;
 
                 list_add_tail(&cmd->list, &instance->cmd_pool);
         }
 
         /*
          * Create a frame pool and assign one frame to each cmd
          */
         if (megasas_create_frame_pool(instance)) {
                 printk(KERN_DEBUG "megasas: Error creating frame DMA pool\n");
                 megasas_free_cmds(instance);
         }
 
         return 0;
 }
 
 /*
  * megasas_get_pd_list_info -   Returns FW's pd_list structure
  * @instance:                           Adapter soft state
  * @pd_list:                            pd_list structure
  *
  * Issues an internal command (DCMD) to get the FW's controller PD
  * list structure.  This information is mainly used to find out SYSTEM
  * supported by the FW.
  */
 static int
 megasas_get_pd_list(struct megasas_instance *instance)
 {
         int ret = 0, pd_index = 0;
         struct megasas_cmd *cmd;
         struct megasas_dcmd_frame *dcmd;
         struct MR_PD_LIST *ci;
         struct MR_PD_ADDRESS *pd_addr;
         dma_addr_t ci_h = 0;
 
         cmd = megasas_get_cmd(instance);
 
         if (!cmd) {
                 printk(KERN_DEBUG "megasas (get_pd_list): Failed to get cmd\n");
                 return -ENOMEM;
         }
 
         dcmd = &cmd->frame->dcmd;
 
         ci = pci_alloc_consistent(instance->pdev,
                   MEGASAS_MAX_PD * sizeof(struct MR_PD_LIST), &ci_h);
 
         if (!ci) {
                 printk(KERN_DEBUG "Failed to alloc mem for pd_list\n");
                 megasas_return_cmd(instance, cmd);
                 return -ENOMEM;
         }
 
         memset(ci, 0, sizeof(*ci));
         memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
 
         dcmd->mbox.b[0] = MR_PD_QUERY_TYPE_EXPOSED_TO_HOST;
         dcmd->mbox.b[1] = 0;
         dcmd->cmd = MFI_CMD_DCMD;
         dcmd->cmd_status = 0xFF;
         dcmd->sge_count = 1;
         dcmd->flags = MFI_FRAME_DIR_READ;
         dcmd->timeout = 0;
         dcmd->data_xfer_len = MEGASAS_MAX_PD * sizeof(struct MR_PD_LIST);
         dcmd->opcode = MR_DCMD_PD_LIST_QUERY;
         dcmd->sgl.sge32[0].phys_addr = ci_h;
         dcmd->sgl.sge32[0].length = MEGASAS_MAX_PD * sizeof(struct MR_PD_LIST);
 
         if (!megasas_issue_polled(instance, cmd)) {
                 ret = 0;
         } else {
                 ret = -1;
         }
 
         /*
         * the following function will get the instance PD LIST.
         */
 
         pd_addr = ci->addr;
 
         if ( ret == 0 &&
                 (ci->count <
                   (MEGASAS_MAX_PD_CHANNELS * MEGASAS_MAX_DEV_PER_CHANNEL))) {
 
                 memset(instance->pd_list, 0,
                         MEGASAS_MAX_PD * sizeof(struct megasas_pd_list));
 
                 for (pd_index = 0; pd_index < ci->count; pd_index++) {
 
                         instance->pd_list[pd_addr->deviceId].tid        =
                                                         pd_addr->deviceId;
                         instance->pd_list[pd_addr->deviceId].driveType  =
                                                         pd_addr->scsiDevType;
                         instance->pd_list[pd_addr->deviceId].driveState =
                                                         MR_PD_STATE_SYSTEM;
                         pd_addr++;
                 }
         }
 
         pci_free_consistent(instance->pdev,
                                 MEGASAS_MAX_PD * sizeof(struct MR_PD_LIST),
                                 ci, ci_h);
         megasas_return_cmd(instance, cmd);
 
         return ret;
 }
 
 /**
  * megasas_get_controller_info -        Returns FW's controller structure
  * @instance:                           Adapter soft state
  * @ctrl_info:                          Controller information structure
  *
  * Issues an internal command (DCMD) to get the FW's controller structure.
  * This information is mainly used to find out the maximum IO transfer per
  * command supported by the FW.
  */
 static int
 megasas_get_ctrl_info(struct megasas_instance *instance,
                       struct megasas_ctrl_info *ctrl_info)
 {
         int ret = 0;
         struct megasas_cmd *cmd;
         struct megasas_dcmd_frame *dcmd;
         struct megasas_ctrl_info *ci;
         dma_addr_t ci_h = 0;
 
         cmd = megasas_get_cmd(instance);
 
         if (!cmd) {
                 printk(KERN_DEBUG "megasas: Failed to get a free cmd\n");
                 return -ENOMEM;
         }
 
         dcmd = &cmd->frame->dcmd;
 
         ci = pci_alloc_consistent(instance->pdev,
                                   sizeof(struct megasas_ctrl_info), &ci_h);
 
         if (!ci) {
                 printk(KERN_DEBUG "Failed to alloc mem for ctrl info\n");
                 megasas_return_cmd(instance, cmd);
                 return -ENOMEM;
         }
 
         memset(ci, 0, sizeof(*ci));
         memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
 
         dcmd->cmd = MFI_CMD_DCMD;
         dcmd->cmd_status = 0xFF;
         dcmd->sge_count = 1;
         dcmd->flags = MFI_FRAME_DIR_READ;
         dcmd->timeout = 0;
         dcmd->data_xfer_len = sizeof(struct megasas_ctrl_info);
         dcmd->opcode = MR_DCMD_CTRL_GET_INFO;
         dcmd->sgl.sge32[0].phys_addr = ci_h;
         dcmd->sgl.sge32[0].length = sizeof(struct megasas_ctrl_info);
 
         if (!megasas_issue_polled(instance, cmd)) {
                 ret = 0;
                 memcpy(ctrl_info, ci, sizeof(struct megasas_ctrl_info));
         } else {
                 ret = -1;
         }
 
         pci_free_consistent(instance->pdev, sizeof(struct megasas_ctrl_info),
                             ci, ci_h);
 
         megasas_return_cmd(instance, cmd);
         return ret;
 }
 
 /**
  * megasas_issue_init_mfi -     Initializes the FW
  * @instance:           Adapter soft state
  *
  * Issues the INIT MFI cmd
  */
 static int
 megasas_issue_init_mfi(struct megasas_instance *instance)
 {
         u32 context;
 
         struct megasas_cmd *cmd;
 
         struct megasas_init_frame *init_frame;
         struct megasas_init_queue_info *initq_info;
         dma_addr_t init_frame_h;
         dma_addr_t initq_info_h;
 
         /*
          * Prepare a init frame. Note the init frame points to queue info
          * structure. Each frame has SGL allocated after first 64 bytes. For
          * this frame - since we don't need any SGL - we use SGL's space as
          * queue info structure
          *
          * We will not get a NULL command below. We just created the pool.
          */
         cmd = megasas_get_cmd(instance);
 
         init_frame = (struct megasas_init_frame *)cmd->frame;
         initq_info = (struct megasas_init_queue_info *)
                 ((unsigned long)init_frame + 64);
 
         init_frame_h = cmd->frame_phys_addr;
         initq_info_h = init_frame_h + 64;
 
         context = init_frame->context;
         memset(init_frame, 0, MEGAMFI_FRAME_SIZE);
         memset(initq_info, 0, sizeof(struct megasas_init_queue_info));
         init_frame->context = context;
 
         initq_info->reply_queue_entries = instance->max_fw_cmds + 1;
         initq_info->reply_queue_start_phys_addr_lo = instance->reply_queue_h;
 
         initq_info->producer_index_phys_addr_lo = instance->producer_h;
         initq_info->consumer_index_phys_addr_lo = instance->consumer_h;
 
         init_frame->cmd = MFI_CMD_INIT;
         init_frame->cmd_status = 0xFF;
         init_frame->queue_info_new_phys_addr_lo = initq_info_h;
 
         init_frame->data_xfer_len = sizeof(struct megasas_init_queue_info);
 
         /*
          * disable the intr before firing the init frame to FW
          */
         instance->instancet->disable_intr(instance->reg_set);
 
         /*
          * Issue the init frame in polled mode
          */
 
         if (megasas_issue_polled(instance, cmd)) {
                 printk(KERN_ERR "megasas: Failed to init firmware\n");
                 megasas_return_cmd(instance, cmd);
                 goto fail_fw_init;
         }
 
         megasas_return_cmd(instance, cmd);
 
         return 0;
 
 fail_fw_init:
         return -EINVAL;
 }
 
 /**
  * megasas_start_timer - Initializes a timer object
  * @instance:           Adapter soft state
  * @timer:              timer object to be initialized
  * @fn:                 timer function
  * @interval:           time interval between timer function call
  */
 static inline void
 megasas_start_timer(struct megasas_instance *instance,
                         struct timer_list *timer,
                         void *fn, unsigned long interval)
 {
         init_timer(timer);
         timer->expires = jiffies + interval;
         timer->data = (unsigned long)instance;
         timer->function = fn;
         add_timer(timer);
 }
 
 /**
  * megasas_io_completion_timer - Timer fn
  * @instance_addr:      Address of adapter soft state
  *
  * Schedules tasklet for cmd completion
  * if poll_mode_io is set
  */
 static void
 megasas_io_completion_timer(unsigned long instance_addr)
 {
         struct megasas_instance *instance =
                         (struct megasas_instance *)instance_addr;
 
         if (atomic_read(&instance->fw_outstanding))
                 tasklet_schedule(&instance->isr_tasklet);
 
         /* Restart timer */
         if (poll_mode_io)
                 mod_timer(&instance->io_completion_timer,
                         jiffies + MEGASAS_COMPLETION_TIMER_INTERVAL);
 }
 
 /**
  * megasas_init_mfi -   Initializes the FW
  * @instance:           Adapter soft state
  *
  * This is the main function for initializing MFI firmware.
  */
 static int megasas_init_mfi(struct megasas_instance *instance)
 {
         u32 context_sz;
         u32 reply_q_sz;
         u32 max_sectors_1;
         u32 max_sectors_2;
         u32 tmp_sectors;
         struct megasas_register_set __iomem *reg_set;
         struct megasas_ctrl_info *ctrl_info;
         /*
          * Map the message registers
          */
         if ((instance->pdev->device == PCI_DEVICE_ID_LSI_SAS1078GEN2) ||
                 (instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0071SKINNY) ||
                 (instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
                 (instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0079GEN2)) {
                 instance->base_addr = pci_resource_start(instance->pdev, 1);
         } else {
                 instance->base_addr = pci_resource_start(instance->pdev, 0);
         }
 
         if (pci_request_selected_regions(instance->pdev,
                 pci_select_bars(instance->pdev, IORESOURCE_MEM),
                 "megasas: LSI")) {
                 printk(KERN_DEBUG "megasas: IO memory region busy!\n");
                 return -EBUSY;
         }
 
         instance->reg_set = ioremap_nocache(instance->base_addr, 8192);
 
         if (!instance->reg_set) {
                 printk(KERN_DEBUG "megasas: Failed to map IO mem\n");
                 goto fail_ioremap;
         }
 
         reg_set = instance->reg_set;
 
         switch(instance->pdev->device)
         {
                 case PCI_DEVICE_ID_LSI_SAS1078R:
                 case PCI_DEVICE_ID_LSI_SAS1078DE:
                         instance->instancet = &megasas_instance_template_ppc;
                         break;
                 case PCI_DEVICE_ID_LSI_SAS1078GEN2:
                 case PCI_DEVICE_ID_LSI_SAS0079GEN2:
                         instance->instancet = &megasas_instance_template_gen2;
                         break;
                 case PCI_DEVICE_ID_LSI_SAS0073SKINNY:
                 case PCI_DEVICE_ID_LSI_SAS0071SKINNY:
                         instance->instancet = &megasas_instance_template_skinny;
                         break;
                 case PCI_DEVICE_ID_LSI_SAS1064R:
                 case PCI_DEVICE_ID_DELL_PERC5:
                 default:
                         instance->instancet = &megasas_instance_template_xscale;
                         break;
         }
 
         /*
          * We expect the FW state to be READY
          */
         if (megasas_transition_to_ready(instance))
                 goto fail_ready_state;
 
         /*
          * Get various operational parameters from status register
          */
         instance->max_fw_cmds = instance->instancet->read_fw_status_reg(reg_set) & 0x00FFFF;
         /*
          * Reduce the max supported cmds by 1. This is to ensure that the
          * reply_q_sz (1 more than the max cmd that driver may send)
          * does not exceed max cmds that the FW can support
          */
         instance->max_fw_cmds = instance->max_fw_cmds-1;
         instance->max_num_sge = (instance->instancet->read_fw_status_reg(reg_set) & 0xFF0000) >> 
                                         0x10;
         /*
          * Create a pool of commands
          */
         if (megasas_alloc_cmds(instance))
                 goto fail_alloc_cmds;
 
         /*
          * Allocate memory for reply queue. Length of reply queue should
          * be _one_ more than the maximum commands handled by the firmware.
          *
          * Note: When FW completes commands, it places corresponding contex
          * values in this circular reply queue. This circular queue is a fairly
          * typical producer-consumer queue. FW is the producer (of completed
          * commands) and the driver is the consumer.
          */
         context_sz = sizeof(u32);
         reply_q_sz = context_sz * (instance->max_fw_cmds + 1);
 
         instance->reply_queue = pci_alloc_consistent(instance->pdev,
                                                      reply_q_sz,
                                                      &instance->reply_queue_h);
 
         if (!instance->reply_queue) {
                 printk(KERN_DEBUG "megasas: Out of DMA mem for reply queue\n");
                 goto fail_reply_queue;
         }
 
         if (megasas_issue_init_mfi(instance))
                 goto fail_fw_init;
 
         memset(instance->pd_list, 0 ,
                 (MEGASAS_MAX_PD * sizeof(struct megasas_pd_list)));
         megasas_get_pd_list(instance);
 
         ctrl_info = kmalloc(sizeof(struct megasas_ctrl_info), GFP_KERNEL);
 
         /*
          * Compute the max allowed sectors per IO: The controller info has two
          * limits on max sectors. Driver should use the minimum of these two.
          *
          * 1 << stripe_sz_ops.min = max sectors per strip
          *
          * Note that older firmwares ( < FW ver 30) didn't report information
          * to calculate max_sectors_1. So the number ended up as zero always.
          */
         tmp_sectors = 0;
         if (ctrl_info && !megasas_get_ctrl_info(instance, ctrl_info)) {
 
                 max_sectors_1 = (1 << ctrl_info->stripe_sz_ops.min) *
                     ctrl_info->max_strips_per_io;
                 max_sectors_2 = ctrl_info->max_request_size;
 
                 tmp_sectors = min_t(u32, max_sectors_1 , max_sectors_2);
         }
 
         instance->max_sectors_per_req = instance->max_num_sge *
                                                 PAGE_SIZE / 512;
         if (tmp_sectors && (instance->max_sectors_per_req > tmp_sectors))
                 instance->max_sectors_per_req = tmp_sectors;
 
         kfree(ctrl_info);
 
         /*
         * Setup tasklet for cmd completion
         */
 
         tasklet_init(&instance->isr_tasklet, megasas_complete_cmd_dpc,
                 (unsigned long)instance);
 
         /* Initialize the cmd completion timer */
         if (poll_mode_io)
                 megasas_start_timer(instance, &instance->io_completion_timer,
                                 megasas_io_completion_timer,
                                 MEGASAS_COMPLETION_TIMER_INTERVAL);
         return 0;
 
       fail_fw_init:
 
         pci_free_consistent(instance->pdev, reply_q_sz,
                             instance->reply_queue, instance->reply_queue_h);
       fail_reply_queue:
         megasas_free_cmds(instance);
 
       fail_alloc_cmds:
       fail_ready_state:
         iounmap(instance->reg_set);
 
       fail_ioremap:
         pci_release_selected_regions(instance->pdev,
                 pci_select_bars(instance->pdev, IORESOURCE_MEM));
 
         return -EINVAL;
 }
 
 /**
  * megasas_release_mfi -        Reverses the FW initialization
  * @intance:                    Adapter soft state
  */
 static void megasas_release_mfi(struct megasas_instance *instance)
 {
         u32 reply_q_sz = sizeof(u32) * (instance->max_fw_cmds + 1);
 
         pci_free_consistent(instance->pdev, reply_q_sz,
                             instance->reply_queue, instance->reply_queue_h);
 
         megasas_free_cmds(instance);
 
         iounmap(instance->reg_set);
 
         pci_release_selected_regions(instance->pdev,
                 pci_select_bars(instance->pdev, IORESOURCE_MEM));
 }
 
 /**
  * megasas_get_seq_num -        Gets latest event sequence numbers
  * @instance:                   Adapter soft state
  * @eli:                        FW event log sequence numbers information
  *
  * FW maintains a log of all events in a non-volatile area. Upper layers would
  * usually find out the latest sequence number of the events, the seq number at
  * the boot etc. They would "read" all the events below the latest seq number
  * by issuing a direct fw cmd (DCMD). For the future events (beyond latest seq
  * number), they would subsribe to AEN (asynchronous event notification) and
  * wait for the events to happen.
  */
 static int
 megasas_get_seq_num(struct megasas_instance *instance,
                     struct megasas_evt_log_info *eli)
 {
         struct megasas_cmd *cmd;
         struct megasas_dcmd_frame *dcmd;
         struct megasas_evt_log_info *el_info;
         dma_addr_t el_info_h = 0;
 
         cmd = megasas_get_cmd(instance);
 
         if (!cmd) {
                 return -ENOMEM;
         }
 
         dcmd = &cmd->frame->dcmd;
         el_info = pci_alloc_consistent(instance->pdev,
                                        sizeof(struct megasas_evt_log_info),
                                        &el_info_h);
 
         if (!el_info) {
                 megasas_return_cmd(instance, cmd);
                 return -ENOMEM;
         }
 
         memset(el_info, 0, sizeof(*el_info));
         memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
 
         dcmd->cmd = MFI_CMD_DCMD;
         dcmd->cmd_status = 0x0;
         dcmd->sge_count = 1;
         dcmd->flags = MFI_FRAME_DIR_READ;
         dcmd->timeout = 0;
         dcmd->data_xfer_len = sizeof(struct megasas_evt_log_info);
         dcmd->opcode = MR_DCMD_CTRL_EVENT_GET_INFO;
         dcmd->sgl.sge32[0].phys_addr = el_info_h;
         dcmd->sgl.sge32[0].length = sizeof(struct megasas_evt_log_info);
 
         megasas_issue_blocked_cmd(instance, cmd);
 
         /*
          * Copy the data back into callers buffer
          */
         memcpy(eli, el_info, sizeof(struct megasas_evt_log_info));
 
         pci_free_consistent(instance->pdev, sizeof(struct megasas_evt_log_info),
                             el_info, el_info_h);
 
         megasas_return_cmd(instance, cmd);
 
         return 0;
 }
 
 /**
  * megasas_register_aen -       Registers for asynchronous event notification
  * @instance:                   Adapter soft state
  * @seq_num:                    The starting sequence number
  * @class_locale:               Class of the event
  *
  * This function subscribes for AEN for events beyond the @seq_num. It requests
  * to be notified if and only if the event is of type @class_locale
  */
 static int
 megasas_register_aen(struct megasas_instance *instance, u32 seq_num,
                      u32 class_locale_word)
 {
         int ret_val;
         struct megasas_cmd *cmd;
         struct megasas_dcmd_frame *dcmd;
         union megasas_evt_class_locale curr_aen;
         union megasas_evt_class_locale prev_aen;
 
         /*
          * If there an AEN pending already (aen_cmd), check if the
          * class_locale of that pending AEN is inclusive of the new
          * AEN request we currently have. If it is, then we don't have
          * to do anything. In other words, whichever events the current
          * AEN request is subscribing to, have already been subscribed
          * to.
          *
          * If the old_cmd is _not_ inclusive, then we have to abort
          * that command, form a class_locale that is superset of both
          * old and current and re-issue to the FW
          */
 
         curr_aen.word = class_locale_word;
 
         if (instance->aen_cmd) {
 
                 prev_aen.word = instance->aen_cmd->frame->dcmd.mbox.w[1];
 
                 /*
                  * A class whose enum value is smaller is inclusive of all
                  * higher values. If a PROGRESS (= -1) was previously
                  * registered, then a new registration requests for higher
                  * classes need not be sent to FW. They are automatically
                  * included.
                  *
                  * Locale numbers don't have such hierarchy. They are bitmap
                  * values
                  */
                 if ((prev_aen.members.class <= curr_aen.members.class) &&
                     !((prev_aen.members.locale & curr_aen.members.locale) ^
                       curr_aen.members.locale)) {
                         /*
                          * Previously issued event registration includes
                          * current request. Nothing to do.
                          */
                         return 0;
                 } else {
                         curr_aen.members.locale |= prev_aen.members.locale;
 
                         if (prev_aen.members.class < curr_aen.members.class)
                                 curr_aen.members.class = prev_aen.members.class;
 
                         instance->aen_cmd->abort_aen = 1;
                         ret_val = megasas_issue_blocked_abort_cmd(instance,
                                                                   instance->
                                                                   aen_cmd);
 
                         if (ret_val) {
                                 printk(KERN_DEBUG "megasas: Failed to abort "
                                        "previous AEN command\n");
                                 return ret_val;
                         }
                 }
         }
 
         cmd = megasas_get_cmd(instance);
 
         if (!cmd)
                 return -ENOMEM;
 
         dcmd = &cmd->frame->dcmd;
 
         memset(instance->evt_detail, 0, sizeof(struct megasas_evt_detail));
 
         /*
          * Prepare DCMD for aen registration
          */
         memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
 
         dcmd->cmd = MFI_CMD_DCMD;
         dcmd->cmd_status = 0x0;
         dcmd->sge_count = 1;
         dcmd->flags = MFI_FRAME_DIR_READ;
         dcmd->timeout = 0;
         dcmd->data_xfer_len = sizeof(struct megasas_evt_detail);
         dcmd->opcode = MR_DCMD_CTRL_EVENT_WAIT;
         dcmd->mbox.w[0] = seq_num;
         dcmd->mbox.w[1] = curr_aen.word;
         dcmd->sgl.sge32[0].phys_addr = (u32) instance->evt_detail_h;
         dcmd->sgl.sge32[0].length = sizeof(struct megasas_evt_detail);
 
         if (instance->aen_cmd != NULL) {
                 megasas_return_cmd(instance, cmd);
                 return 0;
         }
 
         /*
          * Store reference to the cmd used to register for AEN. When an
          * application wants us to register for AEN, we have to abort this
          * cmd and re-register with a new EVENT LOCALE supplied by that app
          */
         instance->aen_cmd = cmd;
 
         /*
          * Issue the aen registration frame
          */
         instance->instancet->fire_cmd(instance,
                         cmd->frame_phys_addr, 0, instance->reg_set);
 
         return 0;
 }
 
 /**
  * megasas_start_aen -  Subscribes to AEN during driver load time
  * @instance:           Adapter soft state
  */
 static int megasas_start_aen(struct megasas_instance *instance)
 {
         struct megasas_evt_log_info eli;
         union megasas_evt_class_locale class_locale;
 
         /*
          * Get the latest sequence number from FW
          */
         memset(&eli, 0, sizeof(eli));
 
         if (megasas_get_seq_num(instance, &eli))
                 return -1;
 
         /*
          * Register AEN with FW for latest sequence number plus 1
          */
         class_locale.members.reserved = 0;
         class_locale.members.locale = MR_EVT_LOCALE_ALL;
         class_locale.members.class = MR_EVT_CLASS_DEBUG;
 
         return megasas_register_aen(instance, eli.newest_seq_num + 1,
                                     class_locale.word);
 }
 
 /**
  * megasas_io_attach -  Attaches this driver to SCSI mid-layer
  * @instance:           Adapter soft state
  */
 static int megasas_io_attach(struct megasas_instance *instance)
 {
         struct Scsi_Host *host = instance->host;
 
         /*
          * Export parameters required by SCSI mid-layer
          */
         host->irq = instance->pdev->irq;
         host->unique_id = instance->unique_id;
         if ((instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
                 (instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0071SKINNY)) {
                 host->can_queue =
                         instance->max_fw_cmds - MEGASAS_SKINNY_INT_CMDS;
         } else
                 host->can_queue =
                         instance->max_fw_cmds - MEGASAS_INT_CMDS;
         host->this_id = instance->init_id;
         host->sg_tablesize = instance->max_num_sge;
         host->max_sectors = instance->max_sectors_per_req;
         host->cmd_per_lun = 128;
         host->max_channel = MEGASAS_MAX_CHANNELS - 1;
         host->max_id = MEGASAS_MAX_DEV_PER_CHANNEL;
         host->max_lun = MEGASAS_MAX_LUN;
         host->max_cmd_len = 16;
 
         /*
          * Notify the mid-layer about the new controller
          */
         if (scsi_add_host(host, &instance->pdev->dev)) {
                 printk(KERN_DEBUG "megasas: scsi_add_host failed\n");
                 return -ENODEV;
         }
 
         /*
          * Trigger SCSI to scan our drives
          */
         scsi_scan_host(host);
         return 0;
 }
 
 static int
 megasas_set_dma_mask(struct pci_dev *pdev)
 {
         /*
          * All our contollers are capable of performing 64-bit DMA
          */
         if (IS_DMA64) {
                 if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) != 0) {
 
                         if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) != 0)
                                 goto fail_set_dma_mask;
                 }
         } else {
                 if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) != 0)
                         goto fail_set_dma_mask;
         }
         return 0;
 
 fail_set_dma_mask:
         return 1;
 }
 
 /**
  * megasas_probe_one -  PCI hotplug entry point
  * @pdev:               PCI device structure
  * @id:                 PCI ids of supported hotplugged adapter 
  */
 static int __devinit
 megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 {
         int rval;
         struct Scsi_Host *host;
         struct megasas_instance *instance;
 
         /*
          * Announce PCI information
          */
         printk(KERN_INFO "megasas: %#4.04x:%#4.04x:%#4.04x:%#4.04x: ",
                pdev->vendor, pdev->device, pdev->subsystem_vendor,
                pdev->subsystem_device);
 
         printk("bus %d:slot %d:func %d\n",
                pdev->bus->number, PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
 
         /*
          * PCI prepping: enable device set bus mastering and dma mask
          */
         rval = pci_enable_device_mem(pdev);
 
         if (rval) {
                 return rval;
         }
 
         pci_set_master(pdev);
 
         if (megasas_set_dma_mask(pdev))
                 goto fail_set_dma_mask;
 
         host = scsi_host_alloc(&megasas_template,
                                sizeof(struct megasas_instance));
 
         if (!host) {
                 printk(KERN_DEBUG "megasas: scsi_host_alloc failed\n");
                 goto fail_alloc_instance;
         }
 
         instance = (struct megasas_instance *)host->hostdata;
         memset(instance, 0, sizeof(*instance));
 
         instance->producer = pci_alloc_consistent(pdev, sizeof(u32),
                                                   &instance->producer_h);
         instance->consumer = pci_alloc_consistent(pdev, sizeof(u32),
                                                   &instance->consumer_h);
 
         if (!instance->producer || !instance->consumer) {
                 printk(KERN_DEBUG "megasas: Failed to allocate memory for "
                        "producer, consumer\n");
                 goto fail_alloc_dma_buf;
         }
 
         *instance->producer = 0;
         *instance->consumer = 0;
         megasas_poll_wait_aen = 0;
         instance->flag_ieee = 0;
         instance->ev = NULL;
 
         instance->evt_detail = pci_alloc_consistent(pdev,
                                                     sizeof(struct
                                                            megasas_evt_detail),
                                                     &instance->evt_detail_h);
 
         if (!instance->evt_detail) {
                 printk(KERN_DEBUG "megasas: Failed to allocate memory for "
                        "event detail structure\n");
                 goto fail_alloc_dma_buf;
         }
 
         /*
          * Initialize locks and queues
          */
         INIT_LIST_HEAD(&instance->cmd_pool);
 
         atomic_set(&instance->fw_outstanding,0);
 
         init_waitqueue_head(&instance->int_cmd_wait_q);
         init_waitqueue_head(&instance->abort_cmd_wait_q);
 
         spin_lock_init(&instance->cmd_pool_lock);
         spin_lock_init(&instance->fire_lock);
         spin_lock_init(&instance->completion_lock);
         spin_lock_init(&poll_aen_lock);
 
         mutex_init(&instance->aen_mutex);
 
         /*
          * Initialize PCI related and misc parameters
          */
         instance->pdev = pdev;
         instance->host = host;
         instance->unique_id = pdev->bus->number << 8 | pdev->devfn;
         instance->init_id = MEGASAS_DEFAULT_INIT_ID;
 
         if ((instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
                 (instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0071SKINNY)) {
                 instance->flag_ieee = 1;
                 sema_init(&instance->ioctl_sem, MEGASAS_SKINNY_INT_CMDS);
         } else
                 sema_init(&instance->ioctl_sem, MEGASAS_INT_CMDS);
 
         megasas_dbg_lvl = 0;
         instance->flag = 0;
         instance->unload = 1;
         instance->last_time = 0;
 
         /*
          * Initialize MFI Firmware
          */
         if (megasas_init_mfi(instance))
                 goto fail_init_mfi;
 
         /*
          * Register IRQ
          */
         if (request_irq(pdev->irq, megasas_isr, IRQF_SHARED, "megasas", instance)) {
                 printk(KERN_DEBUG "megasas: Failed to register IRQ\n");
                 goto fail_irq;
         }
 
         instance->instancet->enable_intr(instance->reg_set);
 
         /*
          * Store instance in PCI softstate
          */
         pci_set_drvdata(pdev, instance);
 
         /*
          * Add this controller to megasas_mgmt_info structure so that it
          * can be exported to management applications
          */
         megasas_mgmt_info.count++;
         megasas_mgmt_info.instance[megasas_mgmt_info.max_index] = instance;
         megasas_mgmt_info.max_index++;
 
         /*
          * Initiate AEN (Asynchronous Event Notification)
          */
         if (megasas_start_aen(instance)) {
                 printk(KERN_DEBUG "megasas: start aen failed\n");
                 goto fail_start_aen;
         }
 
         /*
          * Register with SCSI mid-layer
          */
         if (megasas_io_attach(instance))
                 goto fail_io_attach;
 
         instance->unload = 0;
         return 0;
 
       fail_start_aen:
       fail_io_attach:
         megasas_mgmt_info.count--;
         megasas_mgmt_info.instance[megasas_mgmt_info.max_index] = NULL;
         megasas_mgmt_info.max_index--;
 
         pci_set_drvdata(pdev, NULL);
         instance->instancet->disable_intr(instance->reg_set);
         free_irq(instance->pdev->irq, instance);
 
         megasas_release_mfi(instance);
 
       fail_irq:
       fail_init_mfi:
       fail_alloc_dma_buf:
         if (instance->evt_detail)
                 pci_free_consistent(pdev, sizeof(struct megasas_evt_detail),
                                     instance->evt_detail,
                                     instance->evt_detail_h);
 
         if (instance->producer)
                 pci_free_consistent(pdev, sizeof(u32), instance->producer,
                                     instance->producer_h);
         if (instance->consumer)
                 pci_free_consistent(pdev, sizeof(u32), instance->consumer,
                                     instance->consumer_h);
         scsi_host_put(host);
 
       fail_alloc_instance:
       fail_set_dma_mask:
         pci_disable_device(pdev);
 
         return -ENODEV;
 }
 
 /**
  * megasas_flush_cache -        Requests FW to flush all its caches
  * @instance:                   Adapter soft state
  */
 static void megasas_flush_cache(struct megasas_instance *instance)
 {
         struct megasas_cmd *cmd;
         struct megasas_dcmd_frame *dcmd;
 
         cmd = megasas_get_cmd(instance);
 
         if (!cmd)
                 return;
 
         dcmd = &cmd->frame->dcmd;
 
         memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
 
         dcmd->cmd = MFI_CMD_DCMD;
         dcmd->cmd_status = 0x0;
         dcmd->sge_count = 0;
         dcmd->flags = MFI_FRAME_DIR_NONE;
         dcmd->timeout = 0;
         dcmd->data_xfer_len = 0;
         dcmd->opcode = MR_DCMD_CTRL_CACHE_FLUSH;
         dcmd->mbox.b[0] = MR_FLUSH_CTRL_CACHE | MR_FLUSH_DISK_CACHE;
 
         megasas_issue_blocked_cmd(instance, cmd);
 
         megasas_return_cmd(instance, cmd);
 
         return;
 }
 
 /**
  * megasas_shutdown_controller -        Instructs FW to shutdown the controller
  * @instance:                           Adapter soft state
  * @opcode:                             Shutdown/Hibernate
  */
 static void megasas_shutdown_controller(struct megasas_instance *instance,
                                         u32 opcode)
 {
         struct megasas_cmd *cmd;
         struct megasas_dcmd_frame *dcmd;
 
         cmd = megasas_get_cmd(instance);
 
         if (!cmd)
                 return;
 
         if (instance->aen_cmd)
                 megasas_issue_blocked_abort_cmd(instance, instance->aen_cmd);
 
         dcmd = &cmd->frame->dcmd;
 
         memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
 
         dcmd->cmd = MFI_CMD_DCMD;
         dcmd->cmd_status = 0x0;
         dcmd->sge_count = 0;
         dcmd->flags = MFI_FRAME_DIR_NONE;
         dcmd->timeout = 0;
         dcmd->data_xfer_len = 0;
         dcmd->opcode = opcode;
 
         megasas_issue_blocked_cmd(instance, cmd);
 
         megasas_return_cmd(instance, cmd);
 
         return;
 }
 
 #ifdef CONFIG_PM
 /**
  * megasas_suspend -    driver suspend entry point
  * @pdev:               PCI device structure
  * @state:              PCI power state to suspend routine
  */
 static int
 megasas_suspend(struct pci_dev *pdev, pm_message_t state)
 {
         struct Scsi_Host *host;
         struct megasas_instance *instance;
 
         instance = pci_get_drvdata(pdev);
         host = instance->host;
         instance->unload = 1;
 
         if (poll_mode_io)
                 del_timer_sync(&instance->io_completion_timer);
 
         megasas_flush_cache(instance);
         megasas_shutdown_controller(instance, MR_DCMD_HIBERNATE_SHUTDOWN);
 
         /* cancel the delayed work if this work still in queue */
         if (instance->ev != NULL) {
                 struct megasas_aen_event *ev = instance->ev;
                 cancel_delayed_work(
                         (struct delayed_work *)&ev->hotplug_work);
                 flush_scheduled_work();
                 instance->ev = NULL;
         }
 
         tasklet_kill(&instance->isr_tasklet);
 
         pci_set_drvdata(instance->pdev, instance);
         instance->instancet->disable_intr(instance->reg_set);
         free_irq(instance->pdev->irq, instance);
 
         pci_save_state(pdev);
         pci_disable_device(pdev);
 
         pci_set_power_state(pdev, pci_choose_state(pdev, state));
 
         return 0;
 }
 
 /**
  * megasas_resume-      driver resume entry point
  * @pdev:               PCI device structure
  */
 static int
 megasas_resume(struct pci_dev *pdev)
 {
         int rval;
         struct Scsi_Host *host;
         struct megasas_instance *instance;
 
         instance = pci_get_drvdata(pdev);
         host = instance->host;
         pci_set_power_state(pdev, PCI_D0);
         pci_enable_wake(pdev, PCI_D0, 0);
         pci_restore_state(pdev);
 
         /*
          * PCI prepping: enable device set bus mastering and dma mask
          */
         rval = pci_enable_device_mem(pdev);
 
         if (rval) {
                 printk(KERN_ERR "megasas: Enable device failed\n");
                 return rval;
         }
 
         pci_set_master(pdev);
 
         if (megasas_set_dma_mask(pdev))
                 goto fail_set_dma_mask;
 
         /*
          * Initialize MFI Firmware
          */
 
         *instance->producer = 0;
         *instance->consumer = 0;
 
         atomic_set(&instance->fw_outstanding, 0);
 
         /*
          * We expect the FW state to be READY
          */
         if (megasas_transition_to_ready(instance))
                 goto fail_ready_state;
 
         if (megasas_issue_init_mfi(instance))
                 goto fail_init_mfi;
 
         tasklet_init(&instance->isr_tasklet, megasas_complete_cmd_dpc,
                         (unsigned long)instance);
 
         /*
          * Register IRQ
          */
         if (request_irq(pdev->irq, megasas_isr, IRQF_SHARED,
                 "megasas", instance)) {
                 printk(KERN_ERR "megasas: Failed to register IRQ\n");
                 goto fail_irq;
         }
 
         instance->instancet->enable_intr(instance->reg_set);
 
         /*
          * Initiate AEN (Asynchronous Event Notification)
          */
         if (megasas_start_aen(instance))
                 printk(KERN_ERR "megasas: Start AEN failed\n");
 
         /* Initialize the cmd completion timer */
         if (poll_mode_io)
                 megasas_start_timer(instance, &instance->io_completion_timer,
                                 megasas_io_completion_timer,
                                 MEGASAS_COMPLETION_TIMER_INTERVAL);
         instance->unload = 0;
 
         return 0;
 
 fail_irq:
 fail_init_mfi:
         if (instance->evt_detail)
                 pci_free_consistent(pdev, sizeof(struct megasas_evt_detail),
                                 instance->evt_detail,
                                 instance->evt_detail_h);
 
         if (instance->producer)
                 pci_free_consistent(pdev, sizeof(u32), instance->producer,
                                 instance->producer_h);
         if (instance->consumer)
                 pci_free_consistent(pdev, sizeof(u32), instance->consumer,
                                 instance->consumer_h);
         scsi_host_put(host);
 
 fail_set_dma_mask:
 fail_ready_state:
 
         pci_disable_device(pdev);
 
         return -ENODEV;
 }
 #else
 #define megasas_suspend NULL
 #define megasas_resume  NULL
 #endif
 
 /**
  * megasas_detach_one - PCI hot"un"plug entry point
  * @pdev:               PCI device structure
  */
 static void __devexit megasas_detach_one(struct pci_dev *pdev)
 {
         int i;
         struct Scsi_Host *host;
         struct megasas_instance *instance;
 
         instance = pci_get_drvdata(pdev);
         instance->unload = 1;
         host = instance->host;
 
         if (poll_mode_io)
                 del_timer_sync(&instance->io_completion_timer);
 
         scsi_remove_host(instance->host);
         megasas_flush_cache(instance);
         megasas_shutdown_controller(instance, MR_DCMD_CTRL_SHUTDOWN);
 
         /* cancel the delayed work if this work still in queue*/
         if (instance->ev != NULL) {
                 struct megasas_aen_event *ev = instance->ev;
                 cancel_delayed_work(
                         (struct delayed_work *)&ev->hotplug_work);
                 flush_scheduled_work();
                 instance->ev = NULL;
         }
 
         tasklet_kill(&instance->isr_tasklet);
 
         /*
          * Take the instance off the instance array. Note that we will not
          * decrement the max_index. We let this array be sparse array
          */
         for (i = 0; i < megasas_mgmt_info.max_index; i++) {
                 if (megasas_mgmt_info.instance[i] == instance) {
                         megasas_mgmt_info.count--;
                         megasas_mgmt_info.instance[i] = NULL;
 
                         break;
                 }
         }
 
         pci_set_drvdata(instance->pdev, NULL);
 
         instance->instancet->disable_intr(instance->reg_set);
 
         free_irq(instance->pdev->irq, instance);
 
         megasas_release_mfi(instance);
 
         pci_free_consistent(pdev, sizeof(struct megasas_evt_detail),
                             instance->evt_detail, instance->evt_detail_h);
 
         pci_free_consistent(pdev, sizeof(u32), instance->producer,
                             instance->producer_h);
 
         pci_free_consistent(pdev, sizeof(u32), instance->consumer,
                             instance->consumer_h);
 
         scsi_host_put(host);
 
         pci_set_drvdata(pdev, NULL);
 
         pci_disable_device(pdev);
 
         return;
 }
 
 /**
  * megasas_shutdown -   Shutdown entry point
  * @device:             Generic device structure
  */
 static void megasas_shutdown(struct pci_dev *pdev)
 {
         struct megasas_instance *instance = pci_get_drvdata(pdev);
         instance->unload = 1;
         megasas_flush_cache(instance);
         megasas_shutdown_controller(instance, MR_DCMD_CTRL_SHUTDOWN);
 }
 
 /**
  * megasas_mgmt_open -  char node "open" entry point
  */
 static int megasas_mgmt_open(struct inode *inode, struct file *filep)
 {
         cycle_kernel_lock();
         /*
          * Allow only those users with admin rights
          */
         if (!capable(CAP_SYS_ADMIN))
                 return -EACCES;
 
         return 0;
 }
 
 /**
  * megasas_mgmt_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 megasas_mgmt_fasync(int fd, struct file *filep, int mode)
 {
         int rc;
 
         mutex_lock(&megasas_async_queue_mutex);
 
         rc = fasync_helper(fd, filep, mode, &megasas_async_queue);
 
         mutex_unlock(&megasas_async_queue_mutex);
 
         if (rc >= 0) {
                 /* For sanity check when we get ioctl */
                 filep->private_data = filep;
                 return 0;
         }
 
         printk(KERN_DEBUG "megasas: fasync_helper failed [%d]\n", rc);
 
         return rc;
 }
 
 /**
  * megasas_mgmt_poll -  char node "poll" entry point
  * */
 static unsigned int megasas_mgmt_poll(struct file *file, poll_table *wait)
 {
         unsigned int mask;
         unsigned long flags;
         poll_wait(file, &megasas_poll_wait, wait);
         spin_lock_irqsave(&poll_aen_lock, flags);
         if (megasas_poll_wait_aen)
                 mask =   (POLLIN | POLLRDNORM);
         else
                 mask = 0;
         spin_unlock_irqrestore(&poll_aen_lock, flags);
         return mask;
 }
 
 /**
  * megasas_mgmt_fw_ioctl -      Issues management ioctls to FW
  * @instance:                   Adapter soft state
  * @argp:                       User's ioctl packet
  */
 static int
 megasas_mgmt_fw_ioctl(struct megasas_instance *instance,
                       struct megasas_iocpacket __user * user_ioc,
                       struct megasas_iocpacket *ioc)
 {
         struct megasas_sge32 *kern_sge32;
         struct megasas_cmd *cmd;
         void *kbuff_arr[MAX_IOCTL_SGE];
         dma_addr_t buf_handle = 0;
         int error = 0, i;
         void *sense = NULL;
         dma_addr_t sense_handle;
         unsigned long *sense_ptr;
 
         memset(kbuff_arr, 0, sizeof(kbuff_arr));
 
         if (ioc->sge_count > MAX_IOCTL_SGE) {
                 printk(KERN_DEBUG "megasas: SGE count [%d] >  max limit [%d]\n",
                        ioc->sge_count, MAX_IOCTL_SGE);
                 return -EINVAL;
         }
 
         cmd = megasas_get_cmd(instance);
         if (!cmd) {
                 printk(KERN_DEBUG "megasas: Failed to get a cmd packet\n");
                 return -ENOMEM;
         }
 
         /*
          * User's IOCTL packet has 2 frames (maximum). Copy those two
          * frames into our cmd's frames. cmd->frame's context will get
          * overwritten when we copy from user's frames. So set that value
          * alone separately
          */
         memcpy(cmd->frame, ioc->frame.raw, 2 * MEGAMFI_FRAME_SIZE);
         cmd->frame->hdr.context = cmd->index;
         cmd->frame->hdr.pad_0 = 0;