Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/voyager-2.6

[linux-2.6.git] / drivers / scsi / ipr.c

/*
 * ipr.c -- driver for IBM Power Linux RAID adapters
 *
 * Written By: Brian King <brking@us.ibm.com>, IBM Corporation
 *
 * Copyright (C) 2003, 2004 IBM 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

/*
 * Notes:
 *
 * This driver is used to control the following SCSI adapters:
 *
 * IBM iSeries: 5702, 5703, 2780, 5709, 570A, 570B
 *
 * IBM pSeries: PCI-X Dual Channel Ultra 320 SCSI RAID Adapter
 *              PCI-X Dual Channel Ultra 320 SCSI Adapter
 *              PCI-X Dual Channel Ultra 320 SCSI RAID Enablement Card
 *              Embedded SCSI adapter on p615 and p655 systems
 *
 * Supported Hardware Features:
 *      - Ultra 320 SCSI controller
 *      - PCI-X host interface
 *      - Embedded PowerPC RISC Processor and Hardware XOR DMA Engine
 *      - Non-Volatile Write Cache
 *      - Supports attachment of non-RAID disks, tape, and optical devices
 *      - RAID Levels 0, 5, 10
 *      - Hot spare
 *      - Background Parity Checking
 *      - Background Data Scrubbing
 *      - Ability to increase the capacity of an existing RAID 5 disk array
 *              by adding disks
 *
 * Driver Features:
 *      - Tagged command queuing
 *      - Adapter microcode download
 *      - PCI hot plug
 *      - SCSI device hot plug
 *
 */

#include <linux/fs.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/wait.h>
#include <linux/spinlock.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/libata.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/processor.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_cmnd.h>
#include "ipr.h"

/*
 *   Global Data
 */
static struct list_head ipr_ioa_head = LIST_HEAD_INIT(ipr_ioa_head);
static unsigned int ipr_log_level = IPR_DEFAULT_LOG_LEVEL;
static unsigned int ipr_max_speed = 1;
static int ipr_testmode = 0;
static unsigned int ipr_fastfail = 0;
static unsigned int ipr_transop_timeout = IPR_OPERATIONAL_TIMEOUT;
static unsigned int ipr_enable_cache = 1;
static unsigned int ipr_debug = 0;
static int ipr_auto_create = 1;
static DEFINE_SPINLOCK(ipr_driver_lock);

/* This table describes the differences between DMA controller chips */
static const struct ipr_chip_cfg_t ipr_chip_cfg[] = {
        { /* Gemstone, Citrine, Obsidian, and Obsidian-E */
                .mailbox = 0x0042C,
                .cache_line_size = 0x20,
                {
                        .set_interrupt_mask_reg = 0x0022C,
                        .clr_interrupt_mask_reg = 0x00230,
                        .sense_interrupt_mask_reg = 0x0022C,
                        .clr_interrupt_reg = 0x00228,
                        .sense_interrupt_reg = 0x00224,
                        .ioarrin_reg = 0x00404,
                        .sense_uproc_interrupt_reg = 0x00214,
                        .set_uproc_interrupt_reg = 0x00214,
                        .clr_uproc_interrupt_reg = 0x00218
                }
        },
        { /* Snipe and Scamp */
                .mailbox = 0x0052C,
                .cache_line_size = 0x20,
                {
                        .set_interrupt_mask_reg = 0x00288,
                        .clr_interrupt_mask_reg = 0x0028C,
                        .sense_interrupt_mask_reg = 0x00288,
                        .clr_interrupt_reg = 0x00284,
                        .sense_interrupt_reg = 0x00280,
                        .ioarrin_reg = 0x00504,
                        .sense_uproc_interrupt_reg = 0x00290,
                        .set_uproc_interrupt_reg = 0x00290,
                        .clr_uproc_interrupt_reg = 0x00294
                }
        },
};

static const struct ipr_chip_t ipr_chip[] = {
        { PCI_VENDOR_ID_MYLEX, PCI_DEVICE_ID_IBM_GEMSTONE, &ipr_chip_cfg[0] },
        { PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CITRINE, &ipr_chip_cfg[0] },
        { PCI_VENDOR_ID_ADAPTEC2, PCI_DEVICE_ID_ADAPTEC2_OBSIDIAN, &ipr_chip_cfg[0] },
        { PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_OBSIDIAN, &ipr_chip_cfg[0] },
        { PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_OBSIDIAN_E, &ipr_chip_cfg[0] },
        { PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_SNIPE, &ipr_chip_cfg[1] },
        { PCI_VENDOR_ID_ADAPTEC2, PCI_DEVICE_ID_ADAPTEC2_SCAMP, &ipr_chip_cfg[1] }
};

static int ipr_max_bus_speeds [] = {
        IPR_80MBs_SCSI_RATE, IPR_U160_SCSI_RATE, IPR_U320_SCSI_RATE
};

MODULE_AUTHOR("Brian King <brking@us.ibm.com>");
MODULE_DESCRIPTION("IBM Power RAID SCSI Adapter Driver");
module_param_named(max_speed, ipr_max_speed, uint, 0);
MODULE_PARM_DESC(max_speed, "Maximum bus speed (0-2). Default: 1=U160. Speeds: 0=80 MB/s, 1=U160, 2=U320");
module_param_named(log_level, ipr_log_level, uint, 0);
MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver");
module_param_named(testmode, ipr_testmode, int, 0);
MODULE_PARM_DESC(testmode, "DANGEROUS!!! Allows unsupported configurations");
module_param_named(fastfail, ipr_fastfail, int, 0);
MODULE_PARM_DESC(fastfail, "Reduce timeouts and retries");
module_param_named(transop_timeout, ipr_transop_timeout, int, 0);
MODULE_PARM_DESC(transop_timeout, "Time in seconds to wait for adapter to come operational (default: 300)");
module_param_named(enable_cache, ipr_enable_cache, int, 0);
MODULE_PARM_DESC(enable_cache, "Enable adapter's non-volatile write cache (default: 1)");
module_param_named(debug, ipr_debug, int, 0);
MODULE_PARM_DESC(debug, "Enable device driver debugging logging. Set to 1 to enable. (default: 0)");
module_param_named(auto_create, ipr_auto_create, int, 0);
MODULE_PARM_DESC(auto_create, "Auto-create single device RAID 0 arrays when initialized (default: 1)");
MODULE_LICENSE("GPL");
MODULE_VERSION(IPR_DRIVER_VERSION);

/*  A constant array of IOASCs/URCs/Error Messages */
static const
struct ipr_error_table_t ipr_error_table[] = {
        {0x00000000, 1, 1,
        "8155: An unknown error was received"},
        {0x00330000, 0, 0,
        "Soft underlength error"},
        {0x005A0000, 0, 0,
        "Command to be cancelled not found"},
        {0x00808000, 0, 0,
        "Qualified success"},
        {0x01080000, 1, 1,
        "FFFE: Soft device bus error recovered by the IOA"},
        {0x01088100, 0, 1,
        "4101: Soft device bus fabric error"},
        {0x01170600, 0, 1,
        "FFF9: Device sector reassign successful"},
        {0x01170900, 0, 1,
        "FFF7: Media error recovered by device rewrite procedures"},
        {0x01180200, 0, 1,
        "7001: IOA sector reassignment successful"},
        {0x01180500, 0, 1,
        "FFF9: Soft media error. Sector reassignment recommended"},
        {0x01180600, 0, 1,
        "FFF7: Media error recovered by IOA rewrite procedures"},
        {0x01418000, 0, 1,
        "FF3D: Soft PCI bus error recovered by the IOA"},
        {0x01440000, 1, 1,
        "FFF6: Device hardware error recovered by the IOA"},
        {0x01448100, 0, 1,
        "FFF6: Device hardware error recovered by the device"},
        {0x01448200, 1, 1,
        "FF3D: Soft IOA error recovered by the IOA"},
        {0x01448300, 0, 1,
        "FFFA: Undefined device response recovered by the IOA"},
        {0x014A0000, 1, 1,
        "FFF6: Device bus error, message or command phase"},
        {0x014A8000, 0, 1,
        "FFFE: Task Management Function failed"},
        {0x015D0000, 0, 1,
        "FFF6: Failure prediction threshold exceeded"},
        {0x015D9200, 0, 1,
        "8009: Impending cache battery pack failure"},
        {0x02040400, 0, 0,
        "34FF: Disk device format in progress"},
        {0x023F0000, 0, 0,
        "Synchronization required"},
        {0x024E0000, 0, 0,
        "No ready, IOA shutdown"},
        {0x025A0000, 0, 0,
        "Not ready, IOA has been shutdown"},
        {0x02670100, 0, 1,
        "3020: Storage subsystem configuration error"},
        {0x03110B00, 0, 0,
        "FFF5: Medium error, data unreadable, recommend reassign"},
        {0x03110C00, 0, 0,
        "7000: Medium error, data unreadable, do not reassign"},
        {0x03310000, 0, 1,
        "FFF3: Disk media format bad"},
        {0x04050000, 0, 1,
        "3002: Addressed device failed to respond to selection"},
        {0x04080000, 1, 1,
        "3100: Device bus error"},
        {0x04080100, 0, 1,
        "3109: IOA timed out a device command"},
        {0x04088000, 0, 0,
        "3120: SCSI bus is not operational"},
        {0x04088100, 0, 1,
        "4100: Hard device bus fabric error"},
        {0x04118000, 0, 1,
        "9000: IOA reserved area data check"},
        {0x04118100, 0, 1,
        "9001: IOA reserved area invalid data pattern"},
        {0x04118200, 0, 1,
        "9002: IOA reserved area LRC error"},
        {0x04320000, 0, 1,
        "102E: Out of alternate sectors for disk storage"},
        {0x04330000, 1, 1,
        "FFF4: Data transfer underlength error"},
        {0x04338000, 1, 1,
        "FFF4: Data transfer overlength error"},
        {0x043E0100, 0, 1,
        "3400: Logical unit failure"},
        {0x04408500, 0, 1,
        "FFF4: Device microcode is corrupt"},
        {0x04418000, 1, 1,
        "8150: PCI bus error"},
        {0x04430000, 1, 0,
        "Unsupported device bus message received"},
        {0x04440000, 1, 1,
        "FFF4: Disk device problem"},
        {0x04448200, 1, 1,
        "8150: Permanent IOA failure"},
        {0x04448300, 0, 1,
        "3010: Disk device returned wrong response to IOA"},
        {0x04448400, 0, 1,
        "8151: IOA microcode error"},
        {0x04448500, 0, 0,
        "Device bus status error"},
        {0x04448600, 0, 1,
        "8157: IOA error requiring IOA reset to recover"},
        {0x04448700, 0, 0,
        "ATA device status error"},
        {0x04490000, 0, 0,
        "Message reject received from the device"},
        {0x04449200, 0, 1,
        "8008: A permanent cache battery pack failure occurred"},
        {0x0444A000, 0, 1,
        "9090: Disk unit has been modified after the last known status"},
        {0x0444A200, 0, 1,
        "9081: IOA detected device error"},
        {0x0444A300, 0, 1,
        "9082: IOA detected device error"},
        {0x044A0000, 1, 1,
        "3110: Device bus error, message or command phase"},
        {0x044A8000, 1, 1,
        "3110: SAS Command / Task Management Function failed"},
        {0x04670400, 0, 1,
        "9091: Incorrect hardware configuration change has been detected"},
        {0x04678000, 0, 1,
        "9073: Invalid multi-adapter configuration"},
        {0x04678100, 0, 1,
        "4010: Incorrect connection between cascaded expanders"},
        {0x04678200, 0, 1,
        "4020: Connections exceed IOA design limits"},
        {0x04678300, 0, 1,
        "4030: Incorrect multipath connection"},
        {0x04679000, 0, 1,
        "4110: Unsupported enclosure function"},
        {0x046E0000, 0, 1,
        "FFF4: Command to logical unit failed"},
        {0x05240000, 1, 0,
        "Illegal request, invalid request type or request packet"},
        {0x05250000, 0, 0,
        "Illegal request, invalid resource handle"},
        {0x05258000, 0, 0,
        "Illegal request, commands not allowed to this device"},
        {0x05258100, 0, 0,
        "Illegal request, command not allowed to a secondary adapter"},
        {0x05260000, 0, 0,
        "Illegal request, invalid field in parameter list"},
        {0x05260100, 0, 0,
        "Illegal request, parameter not supported"},
        {0x05260200, 0, 0,
        "Illegal request, parameter value invalid"},
        {0x052C0000, 0, 0,
        "Illegal request, command sequence error"},
        {0x052C8000, 1, 0,
        "Illegal request, dual adapter support not enabled"},
        {0x06040500, 0, 1,
        "9031: Array protection temporarily suspended, protection resuming"},
        {0x06040600, 0, 1,
        "9040: Array protection temporarily suspended, protection resuming"},
        {0x06288000, 0, 1,
        "3140: Device bus not ready to ready transition"},
        {0x06290000, 0, 1,
        "FFFB: SCSI bus was reset"},
        {0x06290500, 0, 0,
        "FFFE: SCSI bus transition to single ended"},
        {0x06290600, 0, 0,
        "FFFE: SCSI bus transition to LVD"},
        {0x06298000, 0, 1,
        "FFFB: SCSI bus was reset by another initiator"},
        {0x063F0300, 0, 1,
        "3029: A device replacement has occurred"},
        {0x064C8000, 0, 1,
        "9051: IOA cache data exists for a missing or failed device"},
        {0x064C8100, 0, 1,
        "9055: Auxiliary cache IOA contains cache data needed by the primary IOA"},
        {0x06670100, 0, 1,
        "9025: Disk unit is not supported at its physical location"},
        {0x06670600, 0, 1,
        "3020: IOA detected a SCSI bus configuration error"},
        {0x06678000, 0, 1,
        "3150: SCSI bus configuration error"},
        {0x06678100, 0, 1,
        "9074: Asymmetric advanced function disk configuration"},
        {0x06678300, 0, 1,
        "4040: Incomplete multipath connection between IOA and enclosure"},
        {0x06678400, 0, 1,
        "4041: Incomplete multipath connection between enclosure and device"},
        {0x06678500, 0, 1,
        "9075: Incomplete multipath connection between IOA and remote IOA"},
        {0x06678600, 0, 1,
        "9076: Configuration error, missing remote IOA"},
        {0x06679100, 0, 1,
        "4050: Enclosure does not support a required multipath function"},
        {0x06690200, 0, 1,
        "9041: Array protection temporarily suspended"},
        {0x06698200, 0, 1,
        "9042: Corrupt array parity detected on specified device"},
        {0x066B0200, 0, 1,
        "9030: Array no longer protected due to missing or failed disk unit"},
        {0x066B8000, 0, 1,
        "9071: Link operational transition"},
        {0x066B8100, 0, 1,
        "9072: Link not operational transition"},
        {0x066B8200, 0, 1,
        "9032: Array exposed but still protected"},
        {0x066B9100, 0, 1,
        "4061: Multipath redundancy level got better"},
        {0x066B9200, 0, 1,
        "4060: Multipath redundancy level got worse"},
        {0x07270000, 0, 0,
        "Failure due to other device"},
        {0x07278000, 0, 1,
        "9008: IOA does not support functions expected by devices"},
        {0x07278100, 0, 1,
        "9010: Cache data associated with attached devices cannot be found"},
        {0x07278200, 0, 1,
        "9011: Cache data belongs to devices other than those attached"},
        {0x07278400, 0, 1,
        "9020: Array missing 2 or more devices with only 1 device present"},
        {0x07278500, 0, 1,
        "9021: Array missing 2 or more devices with 2 or more devices present"},
        {0x07278600, 0, 1,
        "9022: Exposed array is missing a required device"},
        {0x07278700, 0, 1,
        "9023: Array member(s) not at required physical locations"},
        {0x07278800, 0, 1,
        "9024: Array not functional due to present hardware configuration"},
        {0x07278900, 0, 1,
        "9026: Array not functional due to present hardware configuration"},
        {0x07278A00, 0, 1,
        "9027: Array is missing a device and parity is out of sync"},
        {0x07278B00, 0, 1,
        "9028: Maximum number of arrays already exist"},
        {0x07278C00, 0, 1,
        "9050: Required cache data cannot be located for a disk unit"},
        {0x07278D00, 0, 1,
        "9052: Cache data exists for a device that has been modified"},
        {0x07278F00, 0, 1,
        "9054: IOA resources not available due to previous problems"},
        {0x07279100, 0, 1,
        "9092: Disk unit requires initialization before use"},
        {0x07279200, 0, 1,
        "9029: Incorrect hardware configuration change has been detected"},
        {0x07279600, 0, 1,
        "9060: One or more disk pairs are missing from an array"},
        {0x07279700, 0, 1,
        "9061: One or more disks are missing from an array"},
        {0x07279800, 0, 1,
        "9062: One or more disks are missing from an array"},
        {0x07279900, 0, 1,
        "9063: Maximum number of functional arrays has been exceeded"},
        {0x0B260000, 0, 0,
        "Aborted command, invalid descriptor"},
        {0x0B5A0000, 0, 0,
        "Command terminated by host"}
};

static const struct ipr_ses_table_entry ipr_ses_table[] = {
        { "2104-DL1        ", "XXXXXXXXXXXXXXXX", 80 },
        { "2104-TL1        ", "XXXXXXXXXXXXXXXX", 80 },
        { "HSBP07M P U2SCSI", "XXXXXXXXXXXXXXXX", 80 }, /* Hidive 7 slot */
        { "HSBP05M P U2SCSI", "XXXXXXXXXXXXXXXX", 80 }, /* Hidive 5 slot */
        { "HSBP05M S U2SCSI", "XXXXXXXXXXXXXXXX", 80 }, /* Bowtie */
        { "HSBP06E ASU2SCSI", "XXXXXXXXXXXXXXXX", 80 }, /* MartinFenning */
        { "2104-DU3        ", "XXXXXXXXXXXXXXXX", 160 },
        { "2104-TU3        ", "XXXXXXXXXXXXXXXX", 160 },
        { "HSBP04C RSU2SCSI", "XXXXXXX*XXXXXXXX", 160 },
        { "HSBP06E RSU2SCSI", "XXXXXXX*XXXXXXXX", 160 },
        { "St  V1S2        ", "XXXXXXXXXXXXXXXX", 160 },
        { "HSBPD4M  PU3SCSI", "XXXXXXX*XXXXXXXX", 160 },
        { "VSBPD1H   U3SCSI", "XXXXXXX*XXXXXXXX", 160 }
};

/*
 *  Function Prototypes
 */
static int ipr_reset_alert(struct ipr_cmnd *);
static void ipr_process_ccn(struct ipr_cmnd *);
static void ipr_process_error(struct ipr_cmnd *);
static void ipr_reset_ioa_job(struct ipr_cmnd *);
static void ipr_initiate_ioa_reset(struct ipr_ioa_cfg *,
                                   enum ipr_shutdown_type);

#ifdef CONFIG_SCSI_IPR_TRACE
/**
 * ipr_trc_hook - Add a trace entry to the driver trace
 * @ipr_cmd:    ipr command struct
 * @type:               trace type
 * @add_data:   additional data
 *
 * Return value:
 *      none
 **/
static void ipr_trc_hook(struct ipr_cmnd *ipr_cmd,
                         u8 type, u32 add_data)
{
        struct ipr_trace_entry *trace_entry;
        struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;

        trace_entry = &ioa_cfg->trace[ioa_cfg->trace_index++];
        trace_entry->time = jiffies;
        trace_entry->op_code = ipr_cmd->ioarcb.cmd_pkt.cdb[0];
        trace_entry->type = type;
        trace_entry->ata_op_code = ipr_cmd->ioarcb.add_data.u.regs.command;
        trace_entry->cmd_index = ipr_cmd->cmd_index & 0xff;
        trace_entry->res_handle = ipr_cmd->ioarcb.res_handle;
        trace_entry->u.add_data = add_data;
}
#else
#define ipr_trc_hook(ipr_cmd, type, add_data) do { } while(0)
#endif

/**
 * ipr_reinit_ipr_cmnd - Re-initialize an IPR Cmnd block for reuse
 * @ipr_cmd:    ipr command struct
 *
 * Return value:
 *      none
 **/
static void ipr_reinit_ipr_cmnd(struct ipr_cmnd *ipr_cmd)
{
        struct ipr_ioarcb *ioarcb = &ipr_cmd->ioarcb;
        struct ipr_ioasa *ioasa = &ipr_cmd->ioasa;

        memset(&ioarcb->cmd_pkt, 0, sizeof(struct ipr_cmd_pkt));
        ioarcb->write_data_transfer_length = 0;
        ioarcb->read_data_transfer_length = 0;
        ioarcb->write_ioadl_len = 0;
        ioarcb->read_ioadl_len = 0;
        ioasa->ioasc = 0;
        ioasa->residual_data_len = 0;
        ioasa->u.gata.status = 0;

        ipr_cmd->scsi_cmd = NULL;
        ipr_cmd->qc = NULL;
        ipr_cmd->sense_buffer[0] = 0;
        ipr_cmd->dma_use_sg = 0;
}

/**
 * ipr_init_ipr_cmnd - Initialize an IPR Cmnd block
 * @ipr_cmd:    ipr command struct
 *
 * Return value:
 *      none
 **/
static void ipr_init_ipr_cmnd(struct ipr_cmnd *ipr_cmd)
{
        ipr_reinit_ipr_cmnd(ipr_cmd);
        ipr_cmd->u.scratch = 0;
        ipr_cmd->sibling = NULL;
        init_timer(&ipr_cmd->timer);
}

/**
 * ipr_get_free_ipr_cmnd - Get a free IPR Cmnd block
 * @ioa_cfg:    ioa config struct
 *
 * Return value:
 *      pointer to ipr command struct
 **/
static
struct ipr_cmnd *ipr_get_free_ipr_cmnd(struct ipr_ioa_cfg *ioa_cfg)
{
        struct ipr_cmnd *ipr_cmd;

        ipr_cmd = list_entry(ioa_cfg->free_q.next, struct ipr_cmnd, queue);
        list_del(&ipr_cmd->queue);
        ipr_init_ipr_cmnd(ipr_cmd);

        return ipr_cmd;
}

/**
 * ipr_unmap_sglist - Unmap scatterlist if mapped
 * @ioa_cfg:    ioa config struct
 * @ipr_cmd:    ipr command struct
 *
 * Return value:
 *      nothing
 **/
static void ipr_unmap_sglist(struct ipr_ioa_cfg *ioa_cfg,
                             struct ipr_cmnd *ipr_cmd)
{
        struct scsi_cmnd *scsi_cmd = ipr_cmd->scsi_cmd;

        if (ipr_cmd->dma_use_sg) {
                if (scsi_cmd->use_sg > 0) {
                        pci_unmap_sg(ioa_cfg->pdev, scsi_cmd->request_buffer,
                                     scsi_cmd->use_sg,
                                     scsi_cmd->sc_data_direction);
                } else {
                        pci_unmap_single(ioa_cfg->pdev, ipr_cmd->dma_handle,
                                         scsi_cmd->request_bufflen,
                                         scsi_cmd->sc_data_direction);
                }
        }
}

/**
 * ipr_mask_and_clear_interrupts - Mask all and clear specified interrupts
 * @ioa_cfg:    ioa config struct
 * @clr_ints:     interrupts to clear
 *
 * This function masks all interrupts on the adapter, then clears the
 * interrupts specified in the mask
 *
 * Return value:
 *      none
 **/
static void ipr_mask_and_clear_interrupts(struct ipr_ioa_cfg *ioa_cfg,
                                          u32 clr_ints)
{
        volatile u32 int_reg;

        /* Stop new interrupts */
        ioa_cfg->allow_interrupts = 0;

        /* Set interrupt mask to stop all new interrupts */
        writel(~0, ioa_cfg->regs.set_interrupt_mask_reg);

        /* Clear any pending interrupts */
        writel(clr_ints, ioa_cfg->regs.clr_interrupt_reg);
        int_reg = readl(ioa_cfg->regs.sense_interrupt_reg);
}

/**
 * ipr_save_pcix_cmd_reg - Save PCI-X command register
 * @ioa_cfg:    ioa config struct
 *
 * Return value:
 *      0 on success / -EIO on failure
 **/
static int ipr_save_pcix_cmd_reg(struct ipr_ioa_cfg *ioa_cfg)
{
        int pcix_cmd_reg = pci_find_capability(ioa_cfg->pdev, PCI_CAP_ID_PCIX);

        if (pcix_cmd_reg == 0)
                return 0;

        if (pci_read_config_word(ioa_cfg->pdev, pcix_cmd_reg + PCI_X_CMD,
                                 &ioa_cfg->saved_pcix_cmd_reg) != PCIBIOS_SUCCESSFUL) {
                dev_err(&ioa_cfg->pdev->dev, "Failed to save PCI-X command register\n");
                return -EIO;
        }

        ioa_cfg->saved_pcix_cmd_reg |= PCI_X_CMD_DPERR_E | PCI_X_CMD_ERO;
        return 0;
}

/**
 * ipr_set_pcix_cmd_reg - Setup PCI-X command register
 * @ioa_cfg:    ioa config struct
 *
 * Return value:
 *      0 on success / -EIO on failure
 **/
static int ipr_set_pcix_cmd_reg(struct ipr_ioa_cfg *ioa_cfg)
{
        int pcix_cmd_reg = pci_find_capability(ioa_cfg->pdev, PCI_CAP_ID_PCIX);

        if (pcix_cmd_reg) {
                if (pci_write_config_word(ioa_cfg->pdev, pcix_cmd_reg + PCI_X_CMD,
                                          ioa_cfg->saved_pcix_cmd_reg) != PCIBIOS_SUCCESSFUL) {
                        dev_err(&ioa_cfg->pdev->dev, "Failed to setup PCI-X command register\n");
                        return -EIO;
                }
        }

        return 0;
}

/**
 * ipr_sata_eh_done - done function for aborted SATA commands
 * @ipr_cmd:    ipr command struct
 *
 * This function is invoked for ops generated to SATA
 * devices which are being aborted.
 *
 * Return value:
 *      none
 **/
static void ipr_sata_eh_done(struct ipr_cmnd *ipr_cmd)
{
        struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
        struct ata_queued_cmd *qc = ipr_cmd->qc;
        struct ipr_sata_port *sata_port = qc->ap->private_data;

        qc->err_mask |= AC_ERR_OTHER;
        sata_port->ioasa.status |= ATA_BUSY;
        list_add_tail(&ipr_cmd->queue, &ioa_cfg->free_q);
        ata_qc_complete(qc);
}

/**
 * ipr_scsi_eh_done - mid-layer done function for aborted ops
 * @ipr_cmd:    ipr command struct
 *
 * This function is invoked by the interrupt handler for
 * ops generated by the SCSI mid-layer which are being aborted.
 *
 * Return value:
 *      none
 **/
static void ipr_scsi_eh_done(struct ipr_cmnd *ipr_cmd)
{
        struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
        struct scsi_cmnd *scsi_cmd = ipr_cmd->scsi_cmd;

        scsi_cmd->result |= (DID_ERROR << 16);

        ipr_unmap_sglist(ioa_cfg, ipr_cmd);
        scsi_cmd->scsi_done(scsi_cmd);
        list_add_tail(&ipr_cmd->queue, &ioa_cfg->free_q);
}

/**
 * ipr_fail_all_ops - Fails all outstanding ops.
 * @ioa_cfg:    ioa config struct
 *
 * This function fails all outstanding ops.
 *
 * Return value:
 *      none
 **/
static void ipr_fail_all_ops(struct ipr_ioa_cfg *ioa_cfg)
{
        struct ipr_cmnd *ipr_cmd, *temp;

        ENTER;
        list_for_each_entry_safe(ipr_cmd, temp, &ioa_cfg->pending_q, queue) {
                list_del(&ipr_cmd->queue);

                ipr_cmd->ioasa.ioasc = cpu_to_be32(IPR_IOASC_IOA_WAS_RESET);
                ipr_cmd->ioasa.ilid = cpu_to_be32(IPR_DRIVER_ILID);

                if (ipr_cmd->scsi_cmd)
                        ipr_cmd->done = ipr_scsi_eh_done;
                else if (ipr_cmd->qc)
                        ipr_cmd->done = ipr_sata_eh_done;

                ipr_trc_hook(ipr_cmd, IPR_TRACE_FINISH, IPR_IOASC_IOA_WAS_RESET);
                del_timer(&ipr_cmd->timer);
                ipr_cmd->done(ipr_cmd);
        }

        LEAVE;
}

/**
 * ipr_do_req -  Send driver initiated requests.
 * @ipr_cmd:            ipr command struct
 * @done:                       done function
 * @timeout_func:       timeout function
 * @timeout:            timeout value
 *
 * This function sends the specified command to the adapter with the
 * timeout given. The done function is invoked on command completion.
 *
 * Return value:
 *      none
 **/
static void ipr_do_req(struct ipr_cmnd *ipr_cmd,
                       void (*done) (struct ipr_cmnd *),
                       void (*timeout_func) (struct ipr_cmnd *), u32 timeout)
{
        struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;

        list_add_tail(&ipr_cmd->queue, &ioa_cfg->pending_q);

        ipr_cmd->done = done;

        ipr_cmd->timer.data = (unsigned long) ipr_cmd;
        ipr_cmd->timer.expires = jiffies + timeout;
        ipr_cmd->timer.function = (void (*)(unsigned long))timeout_func;

        add_timer(&ipr_cmd->timer);

        ipr_trc_hook(ipr_cmd, IPR_TRACE_START, 0);

        mb();
        writel(be32_to_cpu(ipr_cmd->ioarcb.ioarcb_host_pci_addr),
               ioa_cfg->regs.ioarrin_reg);
}

/**
 * ipr_internal_cmd_done - Op done function for an internally generated op.
 * @ipr_cmd:    ipr command struct
 *
 * This function is the op done function for an internally generated,
 * blocking op. It simply wakes the sleeping thread.
 *
 * Return value:
 *      none
 **/
static void ipr_internal_cmd_done(struct ipr_cmnd *ipr_cmd)
{
        if (ipr_cmd->sibling)
                ipr_cmd->sibling = NULL;
        else
                complete(&ipr_cmd->completion);
}

/**
 * ipr_send_blocking_cmd - Send command and sleep on its completion.
 * @ipr_cmd:    ipr command struct
 * @timeout_func:       function to invoke if command times out
 * @timeout:    timeout
 *
 * Return value:
 *      none
 **/
static void ipr_send_blocking_cmd(struct ipr_cmnd *ipr_cmd,
                                  void (*timeout_func) (struct ipr_cmnd *ipr_cmd),
                                  u32 timeout)
{
        struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;

        init_completion(&ipr_cmd->completion);
        ipr_do_req(ipr_cmd, ipr_internal_cmd_done, timeout_func, timeout);

        spin_unlock_irq(ioa_cfg->host->host_lock);
        wait_for_completion(&ipr_cmd->completion);
        spin_lock_irq(ioa_cfg->host->host_lock);
}

/**
 * ipr_send_hcam - Send an HCAM to the adapter.
 * @ioa_cfg:    ioa config struct
 * @type:               HCAM type
 * @hostrcb:    hostrcb struct
 *
 * This function will send a Host Controlled Async command to the adapter.
 * If HCAMs are currently not allowed to be issued to the adapter, it will
 * place the hostrcb on the free queue.
 *
 * Return value:
 *      none
 **/
static void ipr_send_hcam(struct ipr_ioa_cfg *ioa_cfg, u8 type,
                          struct ipr_hostrcb *hostrcb)
{
        struct ipr_cmnd *ipr_cmd;
        struct ipr_ioarcb *ioarcb;

        if (ioa_cfg->allow_cmds) {
                ipr_cmd = ipr_get_free_ipr_cmnd(ioa_cfg);
                list_add_tail(&ipr_cmd->queue, &ioa_cfg->pending_q);
                list_add_tail(&hostrcb->queue, &ioa_cfg->hostrcb_pending_q);

                ipr_cmd->u.hostrcb = hostrcb;
                ioarcb = &ipr_cmd->ioarcb;

                ioarcb->res_handle = cpu_to_be32(IPR_IOA_RES_HANDLE);
                ioarcb->cmd_pkt.request_type = IPR_RQTYPE_HCAM;
                ioarcb->cmd_pkt.cdb[0] = IPR_HOST_CONTROLLED_ASYNC;
                ioarcb->cmd_pkt.cdb[1] = type;
                ioarcb->cmd_pkt.cdb[7] = (sizeof(hostrcb->hcam) >> 8) & 0xff;
                ioarcb->cmd_pkt.cdb[8] = sizeof(hostrcb->hcam) & 0xff;

                ioarcb->read_data_transfer_length = cpu_to_be32(sizeof(hostrcb->hcam));
                ioarcb->read_ioadl_len = cpu_to_be32(sizeof(struct ipr_ioadl_desc));
                ipr_cmd->ioadl[0].flags_and_data_len =
                        cpu_to_be32(IPR_IOADL_FLAGS_READ_LAST | sizeof(hostrcb->hcam));
                ipr_cmd->ioadl[0].address = cpu_to_be32(hostrcb->hostrcb_dma);

                if (type == IPR_HCAM_CDB_OP_CODE_CONFIG_CHANGE)
                        ipr_cmd->done = ipr_process_ccn;
                else
                        ipr_cmd->done = ipr_process_error;

                ipr_trc_hook(ipr_cmd, IPR_TRACE_START, IPR_IOA_RES_ADDR);

                mb();
                writel(be32_to_cpu(ipr_cmd->ioarcb.ioarcb_host_pci_addr),
                       ioa_cfg->regs.ioarrin_reg);
        } else {
                list_add_tail(&hostrcb->queue, &ioa_cfg->hostrcb_free_q);
        }
}

/**
 * ipr_init_res_entry - Initialize a resource entry struct.
 * @res:        resource entry struct
 *
 * Return value:
 *      none
 **/
static void ipr_init_res_entry(struct ipr_resource_entry *res)
{
        res->needs_sync_complete = 0;
        res->in_erp = 0;
        res->add_to_ml = 0;
        res->del_from_ml = 0;
        res->resetting_device = 0;
        res->sdev = NULL;
        res->sata_port = NULL;
}

/**
 * ipr_handle_config_change - Handle a config change from the adapter
 * @ioa_cfg:    ioa config struct
 * @hostrcb:    hostrcb
 *
 * Return value:
 *      none
 **/
static void ipr_handle_config_change(struct ipr_ioa_cfg *ioa_cfg,
                              struct ipr_hostrcb *hostrcb)
{
        struct ipr_resource_entry *res = NULL;
        struct ipr_config_table_entry *cfgte;
        u32 is_ndn = 1;

        cfgte = &hostrcb->hcam.u.ccn.cfgte;

        list_for_each_entry(res, &ioa_cfg->used_res_q, queue) {
                if (!memcmp(&res->cfgte.res_addr, &cfgte->res_addr,
                            sizeof(cfgte->res_addr))) {
                        is_ndn = 0;
                        break;
                }
        }

        if (is_ndn) {
                if (list_empty(&ioa_cfg->free_res_q)) {
                        ipr_send_hcam(ioa_cfg,
                                      IPR_HCAM_CDB_OP_CODE_CONFIG_CHANGE,
                                      hostrcb);
                        return;
                }

                res = list_entry(ioa_cfg->free_res_q.next,
                                 struct ipr_resource_entry, queue);

                list_del(&res->queue);
                ipr_init_res_entry(res);
                list_add_tail(&res->queue, &ioa_cfg->used_res_q);
        }

        memcpy(&res->cfgte, cfgte, sizeof(struct ipr_config_table_entry));

        if (hostrcb->hcam.notify_type == IPR_HOST_RCB_NOTIF_TYPE_REM_ENTRY) {
                if (res->sdev) {
                        res->del_from_ml = 1;
                        res->cfgte.res_handle = IPR_INVALID_RES_HANDLE;
                        if (ioa_cfg->allow_ml_add_del)
                                schedule_work(&ioa_cfg->work_q);
                } else
                        list_move_tail(&res->queue, &ioa_cfg->free_res_q);
        } else if (!res->sdev) {
                res->add_to_ml = 1;
                if (ioa_cfg->allow_ml_add_del)
                        schedule_work(&ioa_cfg->work_q);
        }

        ipr_send_hcam(ioa_cfg, IPR_HCAM_CDB_OP_CODE_CONFIG_CHANGE, hostrcb);
}

/**
 * ipr_process_ccn - Op done function for a CCN.
 * @ipr_cmd:    ipr command struct
 *
 * This function is the op done function for a configuration
 * change notification host controlled async from the adapter.
 *
 * Return value:
 *      none
 **/
static void ipr_process_ccn(struct ipr_cmnd *ipr_cmd)
{
        struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
        struct ipr_hostrcb *hostrcb = ipr_cmd->u.hostrcb;
        u32 ioasc = be32_to_cpu(ipr_cmd->ioasa.ioasc);

        list_del(&hostrcb->queue);
        list_add_tail(&ipr_cmd->queue, &ioa_cfg->free_q);

        if (ioasc) {
                if (ioasc != IPR_IOASC_IOA_WAS_RESET)
                        dev_err(&ioa_cfg->pdev->dev,
                                "Host RCB failed with IOASC: 0x%08X\n", ioasc);

                ipr_send_hcam(ioa_cfg, IPR_HCAM_CDB_OP_CODE_CONFIG_CHANGE, hostrcb);
        } else {
                ipr_handle_config_change(ioa_cfg, hostrcb);
        }
}

/**
 * ipr_log_vpd - Log the passed VPD to the error log.
 * @vpd:                vendor/product id/sn struct
 *
 * Return value:
 *      none
 **/
static void ipr_log_vpd(struct ipr_vpd *vpd)
{
        char buffer[IPR_VENDOR_ID_LEN + IPR_PROD_ID_LEN
                    + IPR_SERIAL_NUM_LEN];

        memcpy(buffer, vpd->vpids.vendor_id, IPR_VENDOR_ID_LEN);
        memcpy(buffer + IPR_VENDOR_ID_LEN, vpd->vpids.product_id,
               IPR_PROD_ID_LEN);
        buffer[IPR_VENDOR_ID_LEN + IPR_PROD_ID_LEN] = '\0';
        ipr_err("Vendor/Product ID: %s\n", buffer);

        memcpy(buffer, vpd->sn, IPR_SERIAL_NUM_LEN);
        buffer[IPR_SERIAL_NUM_LEN] = '\0';
        ipr_err("    Serial Number: %s\n", buffer);
}

/**
 * ipr_log_ext_vpd - Log the passed extended VPD to the error log.
 * @vpd:                vendor/product id/sn/wwn struct
 *
 * Return value:
 *      none
 **/
static void ipr_log_ext_vpd(struct ipr_ext_vpd *vpd)
{
        ipr_log_vpd(&vpd->vpd);
        ipr_err("    WWN: %08X%08X\n", be32_to_cpu(vpd->wwid[0]),
                be32_to_cpu(vpd->wwid[1]));
}

/**
 * ipr_log_enhanced_cache_error - Log a cache error.
 * @ioa_cfg:    ioa config struct
 * @hostrcb:    hostrcb struct
 *
 * Return value:
 *      none
 **/
static void ipr_log_enhanced_cache_error(struct ipr_ioa_cfg *ioa_cfg,
                                         struct ipr_hostrcb *hostrcb)
{
        struct ipr_hostrcb_type_12_error *error =
                &hostrcb->hcam.u.error.u.type_12_error;

        ipr_err("-----Current Configuration-----\n");
        ipr_err("Cache Directory Card Information:\n");
        ipr_log_ext_vpd(&error->ioa_vpd);
        ipr_err("Adapter Card Information:\n");
        ipr_log_ext_vpd(&error->cfc_vpd);

        ipr_err("-----Expected Configuration-----\n");
        ipr_err("Cache Directory Card Information:\n");
        ipr_log_ext_vpd(&error->ioa_last_attached_to_cfc_vpd);
        ipr_err("Adapter Card Information:\n");
        ipr_log_ext_vpd(&error->cfc_last_attached_to_ioa_vpd);

        ipr_err("Additional IOA Data: %08X %08X %08X\n",
                     be32_to_cpu(error->ioa_data[0]),
                     be32_to_cpu(error->ioa_data[1]),
                     be32_to_cpu(error->ioa_data[2]));
}

/**
 * ipr_log_cache_error - Log a cache error.
 * @ioa_cfg:    ioa config struct
 * @hostrcb:    hostrcb struct
 *
 * Return value:
 *      none
 **/
static void ipr_log_cache_error(struct ipr_ioa_cfg *ioa_cfg,
                                struct ipr_hostrcb *hostrcb)
{
        struct ipr_hostrcb_type_02_error *error =
                &hostrcb->hcam.u.error.u.type_02_error;

        ipr_err("-----Current Configuration-----\n");
        ipr_err("Cache Directory Card Information:\n");
        ipr_log_vpd(&error->ioa_vpd);
        ipr_err("Adapter Card Information:\n");
        ipr_log_vpd(&error->cfc_vpd);

        ipr_err("-----Expected Configuration-----\n");
        ipr_err("Cache Directory Card Information:\n");
        ipr_log_vpd(&error->ioa_last_attached_to_cfc_vpd);
        ipr_err("Adapter Card Information:\n");
        ipr_log_vpd(&error->cfc_last_attached_to_ioa_vpd);

        ipr_err("Additional IOA Data: %08X %08X %08X\n",
                     be32_to_cpu(error->ioa_data[0]),
                     be32_to_cpu(error->ioa_data[1]),
                     be32_to_cpu(error->ioa_data[2]));
}

/**
 * ipr_log_enhanced_config_error - Log a configuration error.
 * @ioa_cfg:    ioa config struct
 * @hostrcb:    hostrcb struct
 *
 * Return value:
 *      none
 **/
static void ipr_log_enhanced_config_error(struct ipr_ioa_cfg *ioa_cfg,
                                          struct ipr_hostrcb *hostrcb)
{
        int errors_logged, i;
        struct ipr_hostrcb_device_data_entry_enhanced *dev_entry;
        struct ipr_hostrcb_type_13_error *error;

        error = &hostrcb->hcam.u.error.u.type_13_error;
        errors_logged = be32_to_cpu(error->errors_logged);

        ipr_err("Device Errors Detected/Logged: %d/%d\n",
                be32_to_cpu(error->errors_detected), errors_logged);

        dev_entry = error->dev;

        for (i = 0; i < errors_logged; i++, dev_entry++) {
                ipr_err_separator;

                ipr_phys_res_err(ioa_cfg, dev_entry->dev_res_addr, "Device %d", i + 1);
                ipr_log_ext_vpd(&dev_entry->vpd);

                ipr_err("-----New Device Information-----\n");
                ipr_log_ext_vpd(&dev_entry->new_vpd);

                ipr_err("Cache Directory Card Information:\n");
                ipr_log_ext_vpd(&dev_entry->ioa_last_with_dev_vpd);

                ipr_err("Adapter Card Information:\n");
                ipr_log_ext_vpd(&dev_entry->cfc_last_with_dev_vpd);
        }
}

/**
 * ipr_log_config_error - Log a configuration error.
 * @ioa_cfg:    ioa config struct
 * @hostrcb:    hostrcb struct
 *
 * Return value:
 *      none
 **/
static void ipr_log_config_error(struct ipr_ioa_cfg *ioa_cfg,
                                 struct ipr_hostrcb *hostrcb)
{
        int errors_logged, i;
        struct ipr_hostrcb_device_data_entry *dev_entry;
        struct ipr_hostrcb_type_03_error *error;

        error = &hostrcb->hcam.u.error.u.type_03_error;
        errors_logged = be32_to_cpu(error->errors_logged);

        ipr_err("Device Errors Detected/Logged: %d/%d\n",
                be32_to_cpu(error->errors_detected), errors_logged);

        dev_entry = error->dev;

        for (i = 0; i < errors_logged; i++, dev_entry++) {
                ipr_err_separator;

                ipr_phys_res_err(ioa_cfg, dev_entry->dev_res_addr, "Device %d", i + 1);
                ipr_log_vpd(&dev_entry->vpd);

                ipr_err("-----New Device Information-----\n");
                ipr_log_vpd(&dev_entry->new_vpd);

                ipr_err("Cache Directory Card Information:\n");
                ipr_log_vpd(&dev_entry->ioa_last_with_dev_vpd);

                ipr_err("Adapter Card Information:\n");
                ipr_log_vpd(&dev_entry->cfc_last_with_dev_vpd);

                ipr_err("Additional IOA Data: %08X %08X %08X %08X %08X\n",
                        be32_to_cpu(dev_entry->ioa_data[0]),
                        be32_to_cpu(dev_entry->ioa_data[1]),
                        be32_to_cpu(dev_entry->ioa_data[2]),
                        be32_to_cpu(dev_entry->ioa_data[3]),
                        be32_to_cpu(dev_entry->ioa_data[4]));
        }
}

/**
 * ipr_log_enhanced_array_error - Log an array configuration error.
 * @ioa_cfg:    ioa config struct
 * @hostrcb:    hostrcb struct
 *
 * Return value:
 *      none
 **/
static void ipr_log_enhanced_array_error(struct ipr_ioa_cfg *ioa_cfg,
                                         struct ipr_hostrcb *hostrcb)
{
        int i, num_entries;
        struct ipr_hostrcb_type_14_error *error;
        struct ipr_hostrcb_array_data_entry_enhanced *array_entry;
        const u8 zero_sn[IPR_SERIAL_NUM_LEN] = { [0 ... IPR_SERIAL_NUM_LEN-1] = '0' };

        error = &hostrcb->hcam.u.error.u.type_14_error;

        ipr_err_separator;

        ipr_err("RAID %s Array Configuration: %d:%d:%d:%d\n",
                error->protection_level,
                ioa_cfg->host->host_no,
                error->last_func_vset_res_addr.bus,
                error->last_func_vset_res_addr.target,
                error->last_func_vset_res_addr.lun);

        ipr_err_separator;

        array_entry = error->array_member;
        num_entries = min_t(u32, be32_to_cpu(error->num_entries),
                            sizeof(error->array_member));

        for (i = 0; i < num_entries; i++, array_entry++) {
                if (!memcmp(array_entry->vpd.vpd.sn, zero_sn, IPR_SERIAL_NUM_LEN))
                        continue;

                if (be32_to_cpu(error->exposed_mode_adn) == i)
                        ipr_err("Exposed Array Member %d:\n", i);
                else
                        ipr_err("Array Member %d:\n", i);

                ipr_log_ext_vpd(&array_entry->vpd);
                ipr_phys_res_err(ioa_cfg, array_entry->dev_res_addr, "Current Location");
                ipr_phys_res_err(ioa_cfg, array_entry->expected_dev_res_addr,
                                 "Expected Location");

                ipr_err_separator;
        }
}

/**
 * ipr_log_array_error - Log an array configuration error.
 * @ioa_cfg:    ioa config struct
 * @hostrcb:    hostrcb struct
 *
 * Return value:
 *      none
 **/
static void ipr_log_array_error(struct ipr_ioa_cfg *ioa_cfg,
                                struct ipr_hostrcb *hostrcb)
{
        int i;
        struct ipr_hostrcb_type_04_error *error;
        struct ipr_hostrcb_array_data_entry *array_entry;
        const u8 zero_sn[IPR_SERIAL_NUM_LEN] = { [0 ... IPR_SERIAL_NUM_LEN-1] = '0' };

        error = &hostrcb->hcam.u.error.u.type_04_error;

        ipr_err_separator;

        ipr_err("RAID %s Array Configuration: %d:%d:%d:%d\n",
                error->protection_level,
                ioa_cfg->host->host_no,
                error->last_func_vset_res_addr.bus,
                error->last_func_vset_res_addr.target,
                error->last_func_vset_res_addr.lun);

        ipr_err_separator;

        array_entry = error->array_member;

        for (i = 0; i < 18; i++) {
                if (!memcmp(array_entry->vpd.sn, zero_sn, IPR_SERIAL_NUM_LEN))
                        continue;

                if (be32_to_cpu(error->exposed_mode_adn) == i)
                        ipr_err("Exposed Array Member %d:\n", i);
                else
                        ipr_err("Array Member %d:\n", i);

                ipr_log_vpd(&array_entry->vpd);

                ipr_phys_res_err(ioa_cfg, array_entry->dev_res_addr, "Current Location");
                ipr_phys_res_err(ioa_cfg, array_entry->expected_dev_res_addr,
                                 "Expected Location");

                ipr_err_separator;

                if (i == 9)
                        array_entry = error->array_member2;
                else
                        array_entry++;
        }
}

/**
 * ipr_log_hex_data - Log additional hex IOA error data.
 * @ioa_cfg:    ioa config struct
 * @data:               IOA error data
 * @len:                data length
 *
 * Return value:
 *      none
 **/
static void ipr_log_hex_data(struct ipr_ioa_cfg *ioa_cfg, u32 *data, int len)
{
        int i;

        if (len == 0)
                return;

        if (ioa_cfg->log_level <= IPR_DEFAULT_LOG_LEVEL)
                len = min_t(int, len, IPR_DEFAULT_MAX_ERROR_DUMP);

        for (i = 0; i < len / 4; i += 4) {
                ipr_err("%08X: %08X %08X %08X %08X\n", i*4,
                        be32_to_cpu(data[i]),
                        be32_to_cpu(data[i+1]),
                        be32_to_cpu(data[i+2]),
                        be32_to_cpu(data[i+3]));
        }
}

/**
 * ipr_log_enhanced_dual_ioa_error - Log an enhanced dual adapter error.
 * @ioa_cfg:    ioa config struct
 * @hostrcb:    hostrcb struct
 *
 * Return value:
 *      none
 **/
static void ipr_log_enhanced_dual_ioa_error(struct ipr_ioa_cfg *ioa_cfg,
                                            struct ipr_hostrcb *hostrcb)
{
        struct ipr_hostrcb_type_17_error *error;

        error = &hostrcb->hcam.u.error.u.type_17_error;
        error->failure_reason[sizeof(error->failure_reason) - 1] = '\0';

        ipr_err("%s\n", error->failure_reason);
        ipr_err("Remote Adapter VPD:\n");
        ipr_log_ext_vpd(&error->vpd);
        ipr_log_hex_data(ioa_cfg, error->data,
                         be32_to_cpu(hostrcb->hcam.length) -
                         (offsetof(struct ipr_hostrcb_error, u) +
                          offsetof(struct ipr_hostrcb_type_17_error, data)));
}

/**
 * ipr_log_dual_ioa_error - Log a dual adapter error.
 * @ioa_cfg:    ioa config struct
 * @hostrcb:    hostrcb struct
 *
 * Return value:
 *      none
 **/
static void ipr_log_dual_ioa_error(struct ipr_ioa_cfg *ioa_cfg,
                                   struct ipr_hostrcb *hostrcb)
{
        struct ipr_hostrcb_type_07_error *error;

        error = &hostrcb->hcam.u.error.u.type_07_error;
        error->failure_reason[sizeof(error->failure_reason) - 1] = '\0';

        ipr_err("%s\n", error->failure_reason);
        ipr_err("Remote Adapter VPD:\n");
        ipr_log_vpd(&error->vpd);
        ipr_log_hex_data(ioa_cfg, error->data,
                         be32_to_cpu(hostrcb->hcam.length) -
                         (offsetof(struct ipr_hostrcb_error, u) +
                          offsetof(struct ipr_hostrcb_type_07_error, data)));
}

static const struct {
        u8 active;
        char *desc;
} path_active_desc[] = {
        { IPR_PATH_NO_INFO, "Path" },
        { IPR_PATH_ACTIVE, "Active path" },
        { IPR_PATH_NOT_ACTIVE, "Inactive path" }
};

static const struct {
        u8 state;
        char *desc;
} path_state_desc[] = {
        { IPR_PATH_STATE_NO_INFO, "has no path state information available" },
        { IPR_PATH_HEALTHY, "is healthy" },
        { IPR_PATH_DEGRADED, "is degraded" },
        { IPR_PATH_FAILED, "is failed" }
};

/**
 * ipr_log_fabric_path - Log a fabric path error
 * @hostrcb:    hostrcb struct
 * @fabric:             fabric descriptor
 *
 * Return value:
 *      none
 **/
static void ipr_log_fabric_path(struct ipr_hostrcb *hostrcb,
                                struct ipr_hostrcb_fabric_desc *fabric)
{
        int i, j;
        u8 path_state = fabric->path_state;
        u8 active = path_state & IPR_PATH_ACTIVE_MASK;
        u8 state = path_state & IPR_PATH_STATE_MASK;

        for (i = 0; i < ARRAY_SIZE(path_active_desc); i++) {
                if (path_active_desc[i].active != active)
                        continue;

                for (j = 0; j < ARRAY_SIZE(path_state_desc); j++) {
                        if (path_state_desc[j].state != state)
                                continue;

                        if (fabric->cascaded_expander == 0xff && fabric->phy == 0xff) {
                                ipr_hcam_err(hostrcb, "%s %s: IOA Port=%d\n",
                                             path_active_desc[i].desc, path_state_desc[j].desc,
                                             fabric->ioa_port);
                        } else if (fabric->cascaded_expander == 0xff) {
                                ipr_hcam_err(hostrcb, "%s %s: IOA Port=%d, Phy=%d\n",
                                             path_active_desc[i].desc, path_state_desc[j].desc,
                                             fabric->ioa_port, fabric->phy);
                        } else if (fabric->phy == 0xff) {
                                ipr_hcam_err(hostrcb, "%s %s: IOA Port=%d, Cascade=%d\n",
                                             path_active_desc[i].desc, path_state_desc[j].desc,
                                             fabric->ioa_port, fabric->cascaded_expander);
                        } else {
                                ipr_hcam_err(hostrcb, "%s %s: IOA Port=%d, Cascade=%d, Phy=%d\n",
                                             path_active_desc[i].desc, path_state_desc[j].desc,
                                             fabric->ioa_port, fabric->cascaded_expander, fabric->phy);
                        }
                        return;
                }
        }

        ipr_err("Path state=%02X IOA Port=%d Cascade=%d Phy=%d\n", path_state,
                fabric->ioa_port, fabric->cascaded_expander, fabric->phy);
}

static const struct {
        u8 type;
        char *desc;
} path_type_desc[] = {
        { IPR_PATH_CFG_IOA_PORT, "IOA port" },
        { IPR_PATH_CFG_EXP_PORT, "Expander port" },
        { IPR_PATH_CFG_DEVICE_PORT, "Device port" },
        { IPR_PATH_CFG_DEVICE_LUN, "Device LUN" }
};

static const struct {
        u8 status;
        char *desc;
} path_status_desc[] = {
        { IPR_PATH_CFG_NO_PROB, "Functional" },
        { IPR_PATH_CFG_DEGRADED, "Degraded" },
        { IPR_PATH_CFG_FAILED, "Failed" },
        { IPR_PATH_CFG_SUSPECT, "Suspect" },
        { IPR_PATH_NOT_DETECTED, "Missing" },
        { IPR_PATH_INCORRECT_CONN, "Incorrectly connected" }
};

static const char *link_rate[] = {
        "unknown",
        "disabled",
        "phy reset problem",
        "spinup hold",
        "port selector",
        "unknown",
        "unknown",
        "unknown",
        "1.5Gbps",
        "3.0Gbps",
        "unknown",
        "unknown",
        "unknown",
        "unknown",
        "unknown",
        "unknown"
};

/**
 * ipr_log_path_elem - Log a fabric path element.
 * @hostrcb:    hostrcb struct
 * @cfg:                fabric path element struct
 *
 * Return value:
 *      none
 **/
static void ipr_log_path_elem(struct ipr_hostrcb *hostrcb,
                              struct ipr_hostrcb_config_element *cfg)
{
        int i, j;
        u8 type = cfg->type_status & IPR_PATH_CFG_TYPE_MASK;
        u8 status = cfg->type_status & IPR_PATH_CFG_STATUS_MASK;

        if (type == IPR_PATH_CFG_NOT_EXIST)
                return;

        for (i = 0; i < ARRAY_SIZE(path_type_desc); i++) {
                if (path_type_desc[i].type != type)
                        continue;

                for (j = 0; j < ARRAY_SIZE(path_status_desc); j++) {
                        if (path_status_desc[j].status != status)
                                continue;

                        if (type == IPR_PATH_CFG_IOA_PORT) {
                                ipr_hcam_err(hostrcb, "%s %s: Phy=%d, Link rate=%s, WWN=%08X%08X\n",
                                             path_status_desc[j].desc, path_type_desc[i].desc,
                                             cfg->phy, link_rate[cfg->link_rate & IPR_PHY_LINK_RATE_MASK],
                                             be32_to_cpu(cfg->wwid[0]), be32_to_cpu(cfg->wwid[1]));
                        } else {
                                if (cfg->cascaded_expander == 0xff && cfg->phy == 0xff) {
                                        ipr_hcam_err(hostrcb, "%s %s: Link rate=%s, WWN=%08X%08X\n",
                                                     path_status_desc[j].desc, path_type_desc[i].desc,
                                                     link_rate[cfg->link_rate & IPR_PHY_LINK_RATE_MASK],
                                                     be32_to_cpu(cfg->wwid[0]), be32_to_cpu(cfg->wwid[1]));
                                } else if (cfg->cascaded_expander == 0xff) {
                                        ipr_hcam_err(hostrcb, "%s %s: Phy=%d, Link rate=%s, "
                                                     "WWN=%08X%08X\n", path_status_desc[j].desc,
                                                     path_type_desc[i].desc, cfg->phy,
                                                     link_rate[cfg->link_rate & IPR_PHY_LINK_RATE_MASK],
                                                     be32_to_cpu(cfg->wwid[0]), be32_to_cpu(cfg->wwid[1]));
                                } else if (cfg->phy == 0xff) {
                                        ipr_hcam_err(hostrcb, "%s %s: Cascade=%d, Link rate=%s, "
                                                     "WWN=%08X%08X\n", path_status_desc[j].desc,
                                                     path_type_desc[i].desc, cfg->cascaded_expander,
                                                     link_rate[cfg->link_rate & IPR_PHY_LINK_RATE_MASK],
                                                     be32_to_cpu(cfg->wwid[0]), be32_to_cpu(cfg->wwid[1]));
                                } else {
                                        ipr_hcam_err(hostrcb, "%s %s: Cascade=%d, Phy=%d, Link rate=%s "
                                                     "WWN=%08X%08X\n", path_status_desc[j].desc,
                                                     path_type_desc[i].desc, cfg->cascaded_expander, cfg->phy,
                                                     link_rate[cfg->link_rate & IPR_PHY_LINK_RATE_MASK],
                                                     be32_to_cpu(cfg->wwid[0]), be32_to_cpu(cfg->wwid[1]));
                                }
                        }
                        return;
                }
        }

        ipr_hcam_err(hostrcb, "Path element=%02X: Cascade=%d Phy=%d Link rate=%s "
                     "WWN=%08X%08X\n", cfg->type_status, cfg->cascaded_expander, cfg->phy,
                     link_rate[cfg->link_rate & IPR_PHY_LINK_RATE_MASK],
                     be32_to_cpu(cfg->wwid[0]), be32_to_cpu(cfg->wwid[1]));
}

/**
 * ipr_log_fabric_error - Log a fabric error.
 * @ioa_cfg:    ioa config struct
 * @hostrcb:    hostrcb struct
 *
 * Return value:
 *      none
 **/
static void ipr_log_fabric_error(struct ipr_ioa_cfg *ioa_cfg,
                                 struct ipr_hostrcb *hostrcb)
{
        struct ipr_hostrcb_type_20_error *error;
        struct ipr_hostrcb_fabric_desc *fabric;
        struct ipr_hostrcb_config_element *cfg;
        int i, add_len;

        error = &hostrcb->hcam.u.error.u.type_20_error;
        error->failure_reason[sizeof(error->failure_reason) - 1] = '\0';
        ipr_hcam_err(hostrcb, "%s\n", error->failure_reason);

        add_len = be32_to_cpu(hostrcb->hcam.length) -
                (offsetof(struct ipr_hostrcb_error, u) +
                 offsetof(struct ipr_hostrcb_type_20_error, desc));

        for (i = 0, fabric = error->desc; i < error->num_entries; i++) {
                ipr_log_fabric_path(hostrcb, fabric);
                for_each_fabric_cfg(fabric, cfg)
                        ipr_log_path_elem(hostrcb, cfg);

                add_len -= be16_to_cpu(fabric->length);
                fabric = (struct ipr_hostrcb_fabric_desc *)
                        ((unsigned long)fabric + be16_to_cpu(fabric->length));
        }

        ipr_log_hex_data(ioa_cfg, (u32 *)fabric, add_len);
}

/**
 * ipr_log_generic_error - Log an adapter error.
 * @ioa_cfg:    ioa config struct
 * @hostrcb:    hostrcb struct
 *
 * Return value:
 *      none
 **/
static void ipr_log_generic_error(struct ipr_ioa_cfg *ioa_cfg,
                                  struct ipr_hostrcb *hostrcb)
{
        ipr_log_hex_data(ioa_cfg, hostrcb->hcam.u.raw.data,
                         be32_to_cpu(hostrcb->hcam.length));
}

/**
 * ipr_get_error - Find the specfied IOASC in the ipr_error_table.
 * @ioasc:      IOASC
 *
 * This function will return the index of into the ipr_error_table
 * for the specified IOASC. If the IOASC is not in the table,
 * 0 will be returned, which points to the entry used for unknown errors.
 *
 * Return value:
 *      index into the ipr_error_table
 **/
static u32 ipr_get_error(u32 ioasc)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(ipr_error_table); i++)
                if (ipr_error_table[i].ioasc == (ioasc & IPR_IOASC_IOASC_MASK))
                        return i;

        return 0;
}

/**
 * ipr_handle_log_data - Log an adapter error.
 * @ioa_cfg:    ioa config struct
 * @hostrcb:    hostrcb struct
 *
 * This function logs an adapter error to the system.
 *
 * Return value:
 *      none
 **/
static void ipr_handle_log_data(struct ipr_ioa_cfg *ioa_cfg,
                                struct ipr_hostrcb *hostrcb)
{
        u32 ioasc;
        int error_index;

        if (hostrcb->hcam.notify_type != IPR_HOST_RCB_NOTIF_TYPE_ERROR_LOG_ENTRY)
                return;

        if (hostrcb->hcam.notifications_lost == IPR_HOST_RCB_NOTIFICATIONS_LOST)
                dev_err(&ioa_cfg->pdev->dev, "Error notifications lost\n");

        ioasc = be32_to_cpu(hostrcb->hcam.u.error.failing_dev_ioasc);

        if (ioasc == IPR_IOASC_BUS_WAS_RESET ||
            ioasc == IPR_IOASC_BUS_WAS_RESET_BY_OTHER) {
                /* Tell the midlayer we had a bus reset so it will handle the UA properly */
                scsi_report_bus_reset(ioa_cfg->host,
                                      hostrcb->hcam.u.error.failing_dev_res_addr.bus);
        }

        error_index = ipr_get_error(ioasc);

        if (!ipr_error_table[error_index].log_hcam)
                return;

        ipr_hcam_err(hostrcb, "%s\n", ipr_error_table[error_index].error);

        /* Set indication we have logged an error */
        ioa_cfg->errors_logged++;

        if (ioa_cfg->log_level < IPR_DEFAULT_LOG_LEVEL)
                return;
        if (be32_to_cpu(hostrcb->hcam.length) > sizeof(hostrcb->hcam.u.raw))
                hostrcb->hcam.length = cpu_to_be32(sizeof(hostrcb->hcam.u.raw));

        switch (hostrcb->hcam.overlay_id) {
        case IPR_HOST_RCB_OVERLAY_ID_2:
                ipr_log_cache_error(ioa_cfg, hostrcb);
                break;
        case IPR_HOST_RCB_OVERLAY_ID_3:
                ipr_log_config_error(ioa_cfg, hostrcb);
                break;
        case IPR_HOST_RCB_OVERLAY_ID_4:
        case IPR_HOST_RCB_OVERLAY_ID_6:
                ipr_log_array_error(ioa_cfg, hostrcb);
                break;
        case IPR_HOST_RCB_OVERLAY_ID_7:
                ipr_log_dual_ioa_error(ioa_cfg, hostrcb);
                break;
        case IPR_HOST_RCB_OVERLAY_ID_12:
                ipr_log_enhanced_cache_error(ioa_cfg, hostrcb);
                break;
        case IPR_HOST_RCB_OVERLAY_ID_13:
                ipr_log_enhanced_config_error(ioa_cfg, hostrcb);
                break;
        case IPR_HOST_RCB_OVERLAY_ID_14:
        case IPR_HOST_RCB_OVERLAY_ID_16:
                ipr_log_enhanced_array_error(ioa_cfg, hostrcb);
                break;
        case IPR_HOST_RCB_OVERLAY_ID_17:
                ipr_log_enhanced_dual_ioa_error(ioa_cfg, hostrcb);
                break;
        case IPR_HOST_RCB_OVERLAY_ID_20:
                ipr_log_fabric_error(ioa_cfg, hostrcb);
                break;
        case IPR_HOST_RCB_OVERLAY_ID_1:
        case IPR_HOST_RCB_OVERLAY_ID_DEFAULT:
        default:
                ipr_log_generic_error(ioa_cfg, hostrcb);
                break;
        }
}

/**
 * ipr_process_error - Op done function for an adapter error log.
 * @ipr_cmd:    ipr command struct
 *
 * This function is the op done function for an error log host
 * controlled async from the adapter. It will log the error and
 * send the HCAM back to the adapter.
 *
 * Return value:
 *      none
 **/
static void ipr_process_error(struct ipr_cmnd *ipr_cmd)
{
        struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
        struct ipr_hostrcb *hostrcb = ipr_cmd->u.hostrcb;
        u32 ioasc = be32_to_cpu(ipr_cmd->ioasa.ioasc);

        list_del(&hostrcb->queue);
        list_add_tail(&ipr_cmd->queue, &ioa_cfg->free_q);

        if (!ioasc) {
                ipr_handle_log_data(ioa_cfg, hostrcb);
        } else if (ioasc != IPR_IOASC_IOA_WAS_RESET) {
                dev_err(&ioa_cfg->pdev->dev,
                        "Host RCB failed with IOASC: 0x%08X\n", ioasc);
        }

        ipr_send_hcam(ioa_cfg, IPR_HCAM_CDB_OP_CODE_LOG_DATA, hostrcb);
}

/**
 * ipr_timeout -  An internally generated op has timed out.
 * @ipr_cmd:    ipr command struct
 *
 * This function blocks host requests and initiates an
 * adapter reset.
 *
 * Return value:
 *      none
 **/
static void ipr_timeout(struct ipr_cmnd *ipr_cmd)
{
        unsigned long lock_flags = 0;
        struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;

        ENTER;
        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);

        ioa_cfg->errors_logged++;
        dev_err(&ioa_cfg->pdev->dev,
                "Adapter being reset due to command timeout.\n");

        if (WAIT_FOR_DUMP == ioa_cfg->sdt_state)
                ioa_cfg->sdt_state = GET_DUMP;

        if (!ioa_cfg->in_reset_reload || ioa_cfg->reset_cmd == ipr_cmd)
                ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NONE);

        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
        LEAVE;
}

/**
 * ipr_oper_timeout -  Adapter timed out transitioning to operational
 * @ipr_cmd:    ipr command struct
 *
 * This function blocks host requests and initiates an
 * adapter reset.
 *
 * Return value:
 *      none
 **/
static void ipr_oper_timeout(struct ipr_cmnd *ipr_cmd)
{
        unsigned long lock_flags = 0;
        struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;

        ENTER;
        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);

        ioa_cfg->errors_logged++;
        dev_err(&ioa_cfg->pdev->dev,
                "Adapter timed out transitioning to operational.\n");

        if (WAIT_FOR_DUMP == ioa_cfg->sdt_state)
                ioa_cfg->sdt_state = GET_DUMP;

        if (!ioa_cfg->in_reset_reload || ioa_cfg->reset_cmd == ipr_cmd) {
                if (ipr_fastfail)
                        ioa_cfg->reset_retries += IPR_NUM_RESET_RELOAD_RETRIES;
                ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NONE);
        }

        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
        LEAVE;
}

/**
 * ipr_reset_reload - Reset/Reload the IOA
 * @ioa_cfg:            ioa config struct
 * @shutdown_type:      shutdown type
 *
 * This function resets the adapter and re-initializes it.
 * This function assumes that all new host commands have been stopped.
 * Return value:
 *      SUCCESS / FAILED
 **/
static int ipr_reset_reload(struct ipr_ioa_cfg *ioa_cfg,
                            enum ipr_shutdown_type shutdown_type)
{
        if (!ioa_cfg->in_reset_reload)
                ipr_initiate_ioa_reset(ioa_cfg, shutdown_type);

        spin_unlock_irq(ioa_cfg->host->host_lock);
        wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload);
        spin_lock_irq(ioa_cfg->host->host_lock);

        /* If we got hit with a host reset while we were already resetting
         the adapter for some reason, and the reset failed. */
        if (ioa_cfg->ioa_is_dead) {
                ipr_trace;
                return FAILED;
        }

        return SUCCESS;
}

/**
 * ipr_find_ses_entry - Find matching SES in SES table
 * @res:        resource entry struct of SES
 *
 * Return value:
 *      pointer to SES table entry / NULL on failure
 **/
static const struct ipr_ses_table_entry *
ipr_find_ses_entry(struct ipr_resource_entry *res)
{
        int i, j, matches;
        const struct ipr_ses_table_entry *ste = ipr_ses_table;

        for (i = 0; i < ARRAY_SIZE(ipr_ses_table); i++, ste++) {
                for (j = 0, matches = 0; j < IPR_PROD_ID_LEN; j++) {
                        if (ste->compare_product_id_byte[j] == 'X') {
                                if (res->cfgte.std_inq_data.vpids.product_id[j] == ste->product_id[j])
                                        matches++;
                                else
                                        break;
                        } else
                                matches++;
                }

                if (matches == IPR_PROD_ID_LEN)
                        return ste;
        }

        return NULL;
}

/**
 * ipr_get_max_scsi_speed - Determine max SCSI speed for a given bus
 * @ioa_cfg:    ioa config struct
 * @bus:                SCSI bus
 * @bus_width:  bus width
 *
 * Return value:
 *      SCSI bus speed in units of 100KHz, 1600 is 160 MHz
 *      For a 2-byte wide SCSI bus, the maximum transfer speed is
 *      twice the maximum transfer rate (e.g. for a wide enabled bus,
 *      max 160MHz = max 320MB/sec).
 **/
static u32 ipr_get_max_scsi_speed(struct ipr_ioa_cfg *ioa_cfg, u8 bus, u8 bus_width)
{
        struct ipr_resource_entry *res;
        const struct ipr_ses_table_entry *ste;
        u32 max_xfer_rate = IPR_MAX_SCSI_RATE(bus_width);

        /* Loop through each config table entry in the config table buffer */
        list_for_each_entry(res, &ioa_cfg->used_res_q, queue) {
                if (!(IPR_IS_SES_DEVICE(res->cfgte.std_inq_data)))
                        continue;

                if (bus != res->cfgte.res_addr.bus)
                        continue;

                if (!(ste = ipr_find_ses_entry(res)))
                        continue;

                max_xfer_rate = (ste->max_bus_speed_limit * 10) / (bus_width / 8);
        }

        return max_xfer_rate;
}

/**
 * ipr_wait_iodbg_ack - Wait for an IODEBUG ACK from the IOA
 * @ioa_cfg:            ioa config struct
 * @max_delay:          max delay in micro-seconds to wait
 *
 * Waits for an IODEBUG ACK from the IOA, doing busy looping.
 *
 * Return value:
 *      0 on success / other on failure
 **/
static int ipr_wait_iodbg_ack(struct ipr_ioa_cfg *ioa_cfg, int max_delay)
{
        volatile u32 pcii_reg;
        int delay = 1;

        /* Read interrupt reg until IOA signals IO Debug Acknowledge */
        while (delay < max_delay) {
                pcii_reg = readl(ioa_cfg->regs.sense_interrupt_reg);

                if (pcii_reg & IPR_PCII_IO_DEBUG_ACKNOWLEDGE)
                        return 0;

                /* udelay cannot be used if delay is more than a few milliseconds */
                if ((delay / 1000) > MAX_UDELAY_MS)
                        mdelay(delay / 1000);
                else
                        udelay(delay);

                delay += delay;
        }
        return -EIO;
}

/**
 * ipr_get_ldump_data_section - Dump IOA memory
 * @ioa_cfg:                    ioa config struct
 * @start_addr:                 adapter address to dump
 * @dest:                               destination kernel buffer
 * @length_in_words:    length to dump in 4 byte words
 *
 * Return value:
 *      0 on success / -EIO on failure
 **/
static int ipr_get_ldump_data_section(struct ipr_ioa_cfg *ioa_cfg,
                                      u32 start_addr,
                                      __be32 *dest, u32 length_in_words)
{
        volatile u32 temp_pcii_reg;
        int i, delay = 0;

        /* Write IOA interrupt reg starting LDUMP state  */
        writel((IPR_UPROCI_RESET_ALERT | IPR_UPROCI_IO_DEBUG_ALERT),
               ioa_cfg->regs.set_uproc_interrupt_reg);

        /* Wait for IO debug acknowledge */
        if (ipr_wait_iodbg_ack(ioa_cfg,
                               IPR_LDUMP_MAX_LONG_ACK_DELAY_IN_USEC)) {
                dev_err(&ioa_cfg->pdev->dev,
                        "IOA dump long data transfer timeout\n");
                return -EIO;
        }

        /* Signal LDUMP interlocked - clear IO debug ack */
        writel(IPR_PCII_IO_DEBUG_ACKNOWLEDGE,
               ioa_cfg->regs.clr_interrupt_reg);

        /* Write Mailbox with starting address */
        writel(start_addr, ioa_cfg->ioa_mailbox);

        /* Signal address valid - clear IOA Reset alert */
        writel(IPR_UPROCI_RESET_ALERT,
               ioa_cfg->regs.clr_uproc_interrupt_reg);

        for (i = 0; i < length_in_words; i++) {
                /* Wait for IO debug acknowledge */
                if (ipr_wait_iodbg_ack(ioa_cfg,
                                       IPR_LDUMP_MAX_SHORT_ACK_DELAY_IN_USEC)) {
                        dev_err(&ioa_cfg->pdev->dev,
                                "IOA dump short data transfer timeout\n");
                        return -EIO;
                }

                /* Read data from mailbox and increment destination pointer */
                *dest = cpu_to_be32(readl(ioa_cfg->ioa_mailbox));
                dest++;

                /* For all but the last word of data, signal data received */
                if (i < (length_in_words - 1)) {
                        /* Signal dump data received - Clear IO debug Ack */
                        writel(IPR_PCII_IO_DEBUG_ACKNOWLEDGE,
                               ioa_cfg->regs.clr_interrupt_reg);
                }
        }

        /* Signal end of block transfer. Set reset alert then clear IO debug ack */
        writel(IPR_UPROCI_RESET_ALERT,
               ioa_cfg->regs.set_uproc_interrupt_reg);

        writel(IPR_UPROCI_IO_DEBUG_ALERT,
               ioa_cfg->regs.clr_uproc_interrupt_reg);

        /* Signal dump data received - Clear IO debug Ack */
        writel(IPR_PCII_IO_DEBUG_ACKNOWLEDGE,
               ioa_cfg->regs.clr_interrupt_reg);

        /* Wait for IOA to signal LDUMP exit - IOA reset alert will be cleared */
        while (delay < IPR_LDUMP_MAX_SHORT_ACK_DELAY_IN_USEC) {
                temp_pcii_reg =
                    readl(ioa_cfg->regs.sense_uproc_interrupt_reg);

                if (!(temp_pcii_reg & IPR_UPROCI_RESET_ALERT))
                        return 0;

                udelay(10);
                delay += 10;
        }

        return 0;
}

#ifdef CONFIG_SCSI_IPR_DUMP
/**
 * ipr_sdt_copy - Copy Smart Dump Table to kernel buffer
 * @ioa_cfg:            ioa config struct
 * @pci_address:        adapter address
 * @length:                     length of data to copy
 *
 * Copy data from PCI adapter to kernel buffer.
 * Note: length MUST be a 4 byte multiple
 * Return value:
 *      0 on success / other on failure
 **/
static int ipr_sdt_copy(struct ipr_ioa_cfg *ioa_cfg,
                        unsigned long pci_address, u32 length)
{
        int bytes_copied = 0;
        int cur_len, rc, rem_len, rem_page_len;
        __be32 *page;
        unsigned long lock_flags = 0;
        struct ipr_ioa_dump *ioa_dump = &ioa_cfg->dump->ioa_dump;

        while (bytes_copied < length &&
               (ioa_dump->hdr.len + bytes_copied) < IPR_MAX_IOA_DUMP_SIZE) {
                if (ioa_dump->page_offset >= PAGE_SIZE ||
                    ioa_dump->page_offset == 0) {
                        page = (__be32 *)__get_free_page(GFP_ATOMIC);

                        if (!page) {
                                ipr_trace;
                                return bytes_copied;
                        }

                        ioa_dump->page_offset = 0;
                        ioa_dump->ioa_data[ioa_dump->next_page_index] = page;
                        ioa_dump->next_page_index++;
                } else
                        page = ioa_dump->ioa_data[ioa_dump->next_page_index - 1];

                rem_len = length - bytes_copied;
                rem_page_len = PAGE_SIZE - ioa_dump->page_offset;
                cur_len = min(rem_len, rem_page_len);

                spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
                if (ioa_cfg->sdt_state == ABORT_DUMP) {
                        rc = -EIO;
                } else {
                        rc = ipr_get_ldump_data_section(ioa_cfg,
                                                        pci_address + bytes_copied,
                                                        &page[ioa_dump->page_offset / 4],
                                                        (cur_len / sizeof(u32)));
                }
                spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);

                if (!rc) {
                        ioa_dump->page_offset += cur_len;
                        bytes_copied += cur_len;
                } else {
                        ipr_trace;
                        break;
                }
                schedule();
        }

        return bytes_copied;
}

/**
 * ipr_init_dump_entry_hdr - Initialize a dump entry header.
 * @hdr:        dump entry header struct
 *
 * Return value:
 *      nothing
 **/
static void ipr_init_dump_entry_hdr(struct ipr_dump_entry_header *hdr)
{
        hdr->eye_catcher = IPR_DUMP_EYE_CATCHER;
        hdr->num_elems = 1;
        hdr->offset = sizeof(*hdr);
        hdr->status = IPR_DUMP_STATUS_SUCCESS;
}

/**
 * ipr_dump_ioa_type_data - Fill in the adapter type in the dump.
 * @ioa_cfg:    ioa config struct
 * @driver_dump:        driver dump struct
 *
 * Return value:
 *      nothing
 **/
static void ipr_dump_ioa_type_data(struct ipr_ioa_cfg *ioa_cfg,
                                   struct ipr_driver_dump *driver_dump)
{
        struct ipr_inquiry_page3 *ucode_vpd = &ioa_cfg->vpd_cbs->page3_data;

        ipr_init_dump_entry_hdr(&driver_dump->ioa_type_entry.hdr);
        driver_dump->ioa_type_entry.hdr.len =
                sizeof(struct ipr_dump_ioa_type_entry) -
                sizeof(struct ipr_dump_entry_header);
        driver_dump->ioa_type_entry.hdr.data_type = IPR_DUMP_DATA_TYPE_BINARY;
        driver_dump->ioa_type_entry.hdr.id = IPR_DUMP_DRIVER_TYPE_ID;
        driver_dump->ioa_type_entry.type = ioa_cfg->type;
        driver_dump->ioa_type_entry.fw_version = (ucode_vpd->major_release << 24) |
                (ucode_vpd->card_type << 16) | (ucode_vpd->minor_release[0] << 8) |
                ucode_vpd->minor_release[1];
        driver_dump->hdr.num_entries++;
}

/**
 * ipr_dump_version_data - Fill in the driver version in the dump.
 * @ioa_cfg:    ioa config struct
 * @driver_dump:        driver dump struct
 *
 * Return value:
 *      nothing
 **/
static void ipr_dump_version_data(struct ipr_ioa_cfg *ioa_cfg,
                                  struct ipr_driver_dump *driver_dump)
{
        ipr_init_dump_entry_hdr(&driver_dump->version_entry.hdr);
        driver_dump->version_entry.hdr.len =
                sizeof(struct ipr_dump_version_entry) -
                sizeof(struct ipr_dump_entry_header);
        driver_dump->version_entry.hdr.data_type = IPR_DUMP_DATA_TYPE_ASCII;
        driver_dump->version_entry.hdr.id = IPR_DUMP_DRIVER_VERSION_ID;
        strcpy(driver_dump->version_entry.version, IPR_DRIVER_VERSION);
        driver_dump->hdr.num_entries++;
}

/**
 * ipr_dump_trace_data - Fill in the IOA trace in the dump.
 * @ioa_cfg:    ioa config struct
 * @driver_dump:        driver dump struct
 *
 * Return value:
 *      nothing
 **/
static void ipr_dump_trace_data(struct ipr_ioa_cfg *ioa_cfg,
                                   struct ipr_driver_dump *driver_dump)
{
        ipr_init_dump_entry_hdr(&driver_dump->trace_entry.hdr);
        driver_dump->trace_entry.hdr.len =
                sizeof(struct ipr_dump_trace_entry) -
                sizeof(struct ipr_dump_entry_header);
        driver_dump->trace_entry.hdr.data_type = IPR_DUMP_DATA_TYPE_BINARY;
        driver_dump->trace_entry.hdr.id = IPR_DUMP_TRACE_ID;
        memcpy(driver_dump->trace_entry.trace, ioa_cfg->trace, IPR_TRACE_SIZE);
        driver_dump->hdr.num_entries++;
}

/**
 * ipr_dump_location_data - Fill in the IOA location in the dump.
 * @ioa_cfg:    ioa config struct
 * @driver_dump:        driver dump struct
 *
 * Return value:
 *      nothing
 **/
static void ipr_dump_location_data(struct ipr_ioa_cfg *ioa_cfg,
                                   struct ipr_driver_dump *driver_dump)
{
        ipr_init_dump_entry_hdr(&driver_dump->location_entry.hdr);
        driver_dump->location_entry.hdr.len =
                sizeof(struct ipr_dump_location_entry) -
                sizeof(struct ipr_dump_entry_header);
        driver_dump->location_entry.hdr.data_type = IPR_DUMP_DATA_TYPE_ASCII;
        driver_dump->location_entry.hdr.id = IPR_DUMP_LOCATION_ID;
        strcpy(driver_dump->location_entry.location, ioa_cfg->pdev->dev.bus_id);
        driver_dump->hdr.num_entries++;
}

/**
 * ipr_get_ioa_dump - Perform a dump of the driver and adapter.
 * @ioa_cfg:    ioa config struct
 * @dump:               dump struct
 *
 * Return value:
 *      nothing
 **/
static void ipr_get_ioa_dump(struct ipr_ioa_cfg *ioa_cfg, struct ipr_dump *dump)
{
        unsigned long start_addr, sdt_word;
        unsigned long lock_flags = 0;
        struct ipr_driver_dump *driver_dump = &dump->driver_dump;
        struct ipr_ioa_dump *ioa_dump = &dump->ioa_dump;
        u32 num_entries, start_off, end_off;
        u32 bytes_to_copy, bytes_copied, rc;
        struct ipr_sdt *sdt;
        int i;

        ENTER;

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);

        if (ioa_cfg->sdt_state != GET_DUMP) {
                spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
                return;
        }

        start_addr = readl(ioa_cfg->ioa_mailbox);

        if (!ipr_sdt_is_fmt2(start_addr)) {
                dev_err(&ioa_cfg->pdev->dev,
                        "Invalid dump table format: %lx\n", start_addr);
                spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
                return;
        }

        dev_err(&ioa_cfg->pdev->dev, "Dump of IOA initiated\n");

        driver_dump->hdr.eye_catcher = IPR_DUMP_EYE_CATCHER;

        /* Initialize the overall dump header */
        driver_dump->hdr.len = sizeof(struct ipr_driver_dump);
        driver_dump->hdr.num_entries = 1;
        driver_dump->hdr.first_entry_offset = sizeof(struct ipr_dump_header);
        driver_dump->hdr.status = IPR_DUMP_STATUS_SUCCESS;
        driver_dump->hdr.os = IPR_DUMP_OS_LINUX;
        driver_dump->hdr.driver_name = IPR_DUMP_DRIVER_NAME;

        ipr_dump_version_data(ioa_cfg, driver_dump);
        ipr_dump_location_data(ioa_cfg, driver_dump);
        ipr_dump_ioa_type_data(ioa_cfg, driver_dump);
        ipr_dump_trace_data(ioa_cfg, driver_dump);

        /* Update dump_header */
        driver_dump->hdr.len += sizeof(struct ipr_dump_entry_header);

        /* IOA Dump entry */
        ipr_init_dump_entry_hdr(&ioa_dump->hdr);
        ioa_dump->format = IPR_SDT_FMT2;
        ioa_dump->hdr.len = 0;
        ioa_dump->hdr.data_type = IPR_DUMP_DATA_TYPE_BINARY;
        ioa_dump->hdr.id = IPR_DUMP_IOA_DUMP_ID;

        /* First entries in sdt are actually a list of dump addresses and
         lengths to gather the real dump data.  sdt represents the pointer
         to the ioa generated dump table.  Dump data will be extracted based
         on entries in this table */
        sdt = &ioa_dump->sdt;

        rc = ipr_get_ldump_data_section(ioa_cfg, start_addr, (__be32 *)sdt,
                                        sizeof(struct ipr_sdt) / sizeof(__be32));

        /* Smart Dump table is ready to use and the first entry is valid */
        if (rc || (be32_to_cpu(sdt->hdr.state) != IPR_FMT2_SDT_READY_TO_USE)) {
                dev_err(&ioa_cfg->pdev->dev,
                        "Dump of IOA failed. Dump table not valid: %d, %X.\n",
                        rc, be32_to_cpu(sdt->hdr.state));
                driver_dump->hdr.status = IPR_DUMP_STATUS_FAILED;
                ioa_cfg->sdt_state = DUMP_OBTAINED;
                spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
                return;
        }

        num_entries = be32_to_cpu(sdt->hdr.num_entries_used);

        if (num_entries > IPR_NUM_SDT_ENTRIES)
                num_entries = IPR_NUM_SDT_ENTRIES;

        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);

        for (i = 0; i < num_entries; i++) {
                if (ioa_dump->hdr.len > IPR_MAX_IOA_DUMP_SIZE) {
                        driver_dump->hdr.status = IPR_DUMP_STATUS_QUAL_SUCCESS;
                        break;
                }

                if (sdt->entry[i].flags & IPR_SDT_VALID_ENTRY) {
                        sdt_word = be32_to_cpu(sdt->entry[i].bar_str_offset);
                        start_off = sdt_word & IPR_FMT2_MBX_ADDR_MASK;
                        end_off = be32_to_cpu(sdt->entry[i].end_offset);

                        if (ipr_sdt_is_fmt2(sdt_word) && sdt_word) {
                                bytes_to_copy = end_off - start_off;
                                if (bytes_to_copy > IPR_MAX_IOA_DUMP_SIZE) {
                                        sdt->entry[i].flags &= ~IPR_SDT_VALID_ENTRY;
                                        continue;
                                }

                                /* Copy data from adapter to driver buffers */
                                bytes_copied = ipr_sdt_copy(ioa_cfg, sdt_word,
                                                            bytes_to_copy);

                                ioa_dump->hdr.len += bytes_copied;

                                if (bytes_copied != bytes_to_copy) {
                                        driver_dump->hdr.status = IPR_DUMP_STATUS_QUAL_SUCCESS;
                                        break;
                                }
                        }
                }
        }

        dev_err(&ioa_cfg->pdev->dev, "Dump of IOA completed.\n");

        /* Update dump_header */
        driver_dump->hdr.len += ioa_dump->hdr.len;
        wmb();
        ioa_cfg->sdt_state = DUMP_OBTAINED;
        LEAVE;
}

#else
#define ipr_get_ioa_dump(ioa_cfg, dump) do { } while(0)
#endif

/**
 * ipr_release_dump - Free adapter dump memory
 * @kref:       kref struct
 *
 * Return value:
 *      nothing
 **/
static void ipr_release_dump(struct kref *kref)
{
        struct ipr_dump *dump = container_of(kref,struct ipr_dump,kref);
        struct ipr_ioa_cfg *ioa_cfg = dump->ioa_cfg;
        unsigned long lock_flags = 0;
        int i;

        ENTER;
        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
        ioa_cfg->dump = NULL;
        ioa_cfg->sdt_state = INACTIVE;
        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);

        for (i = 0; i < dump->ioa_dump.next_page_index; i++)
                free_page((unsigned long) dump->ioa_dump.ioa_data[i]);

        kfree(dump);
        LEAVE;
}

/**
 * ipr_worker_thread - Worker thread
 * @work:               ioa config struct
 *
 * Called at task level from a work thread. This function takes care
 * of adding and removing device from the mid-layer as configuration
 * changes are detected by the adapter.
 *
 * Return value:
 *      nothing
 **/
static void ipr_worker_thread(struct work_struct *work)
{
        unsigned long lock_flags;
        struct ipr_resource_entry *res;
        struct scsi_device *sdev;
        struct ipr_dump *dump;
        struct ipr_ioa_cfg *ioa_cfg =
                container_of(work, struct ipr_ioa_cfg, work_q);
        u8 bus, target, lun;
        int did_work;

        ENTER;
        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);

        if (ioa_cfg->sdt_state == GET_DUMP) {
                dump = ioa_cfg->dump;
                if (!dump) {
                        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
                        return;
                }
                kref_get(&dump->kref);
                spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
                ipr_get_ioa_dump(ioa_cfg, dump);
                kref_put(&dump->kref, ipr_release_dump);

                spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
                if (ioa_cfg->sdt_state == DUMP_OBTAINED)
                        ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NONE);
                spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
                return;
        }

restart:
        do {
                did_work = 0;
                if (!ioa_cfg->allow_cmds || !ioa_cfg->allow_ml_add_del) {
                        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
                        return;
                }

                list_for_each_entry(res, &ioa_cfg->used_res_q, queue) {
                        if (res->del_from_ml && res->sdev) {
                                did_work = 1;
                                sdev = res->sdev;
                                if (!scsi_device_get(sdev)) {
                                        list_move_tail(&res->queue, &ioa_cfg->free_res_q);
                                        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
                                        scsi_remove_device(sdev);
                                        scsi_device_put(sdev);
                                        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
                                }
                                break;
                        }
                }
        } while(did_work);

        list_for_each_entry(res, &ioa_cfg->used_res_q, queue) {
                if (res->add_to_ml) {
                        bus = res->cfgte.res_addr.bus;
                        target = res->cfgte.res_addr.target;
                        lun = res->cfgte.res_addr.lun;
                        res->add_to_ml = 0;
                        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
                        scsi_add_device(ioa_cfg->host, bus, target, lun);
                        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
                        goto restart;
                }
        }

        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
        kobject_uevent(&ioa_cfg->host->shost_classdev.kobj, KOBJ_CHANGE);
        LEAVE;
}

#ifdef CONFIG_SCSI_IPR_TRACE
/**
 * ipr_read_trace - Dump the adapter trace
 * @kobj:               kobject struct
 * @buf:                buffer
 * @off:                offset
 * @count:              buffer size
 *
 * Return value:
 *      number of bytes printed to buffer
 **/
static ssize_t ipr_read_trace(struct kobject *kobj, char *buf,
                              loff_t off, size_t count)
{
        struct class_device *cdev = container_of(kobj,struct class_device,kobj);
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
        unsigned long lock_flags = 0;
        int size = IPR_TRACE_SIZE;
        char *src = (char *)ioa_cfg->trace;

        if (off > size)
                return 0;
        if (off + count > size) {
                size -= off;
                count = size;
        }

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
        memcpy(buf, &src[off], count);
        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
        return count;
}

static struct bin_attribute ipr_trace_attr = {
        .attr = {
                .name = "trace",
                .mode = S_IRUGO,
        },
        .size = 0,
        .read = ipr_read_trace,
};
#endif

static const struct {
        enum ipr_cache_state state;
        char *name;
} cache_state [] = {
        { CACHE_NONE, "none" },
        { CACHE_DISABLED, "disabled" },
        { CACHE_ENABLED, "enabled" }
};

/**
 * ipr_show_write_caching - Show the write caching attribute
 * @class_dev:  class device struct
 * @buf:                buffer
 *
 * Return value:
 *      number of bytes printed to buffer
 **/
static ssize_t ipr_show_write_caching(struct class_device *class_dev, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(class_dev);
        struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
        unsigned long lock_flags = 0;
        int i, len = 0;

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
        for (i = 0; i < ARRAY_SIZE(cache_state); i++) {
                if (cache_state[i].state == ioa_cfg->cache_state) {
                        len = snprintf(buf, PAGE_SIZE, "%s\n", cache_state[i].name);
                        break;
                }
        }
        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
        return len;
}


/**
 * ipr_store_write_caching - Enable/disable adapter write cache
 * @class_dev:  class_device struct
 * @buf:                buffer
 * @count:              buffer size
 *
 * This function will enable/disable adapter write cache.
 *
 * Return value:
 *      count on success / other on failure
 **/
static ssize_t ipr_store_write_caching(struct class_device *class_dev,
                                        const char *buf, size_t count)
{
        struct Scsi_Host *shost = class_to_shost(class_dev);
        struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
        unsigned long lock_flags = 0;
        enum ipr_cache_state new_state = CACHE_INVALID;
        int i;

        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;
        if (ioa_cfg->cache_state == CACHE_NONE)
                return -EINVAL;

        for (i = 0; i < ARRAY_SIZE(cache_state); i++) {
                if (!strncmp(cache_state[i].name, buf, strlen(cache_state[i].name))) {
                        new_state = cache_state[i].state;
                        break;
                }
        }

        if (new_state != CACHE_DISABLED && new_state != CACHE_ENABLED)
                return -EINVAL;

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
        if (ioa_cfg->cache_state == new_state) {
                spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
                return count;
        }

        ioa_cfg->cache_state = new_state;
        dev_info(&ioa_cfg->pdev->dev, "%s adapter write cache.\n",
                 new_state == CACHE_ENABLED ? "Enabling" : "Disabling");
        if (!ioa_cfg->in_reset_reload)
                ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NORMAL);
        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
        wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload);

        return count;
}

static struct class_device_attribute ipr_ioa_cache_attr = {
        .attr = {
                .name =         "write_cache",
                .mode =         S_IRUGO | S_IWUSR,
        },
        .show = ipr_show_write_caching,
        .store = ipr_store_write_caching
};

/**
 * ipr_show_fw_version - Show the firmware version
 * @class_dev:  class device struct
 * @buf:                buffer
 *
 * Return value:
 *      number of bytes printed to buffer
 **/
static ssize_t ipr_show_fw_version(struct class_device *class_dev, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(class_dev);
        struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
        struct ipr_inquiry_page3 *ucode_vpd = &ioa_cfg->vpd_cbs->page3_data;
        unsigned long lock_flags = 0;
        int len;

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
        len = snprintf(buf, PAGE_SIZE, "%02X%02X%02X%02X\n",
                       ucode_vpd->major_release, ucode_vpd->card_type,
                       ucode_vpd->minor_release[0],
                       ucode_vpd->minor_release[1]);
        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
        return len;
}

static struct class_device_attribute ipr_fw_version_attr = {
        .attr = {
                .name =         "fw_version",
                .mode =         S_IRUGO,
        },
        .show = ipr_show_fw_version,
};

/**
 * ipr_show_log_level - Show the adapter's error logging level
 * @class_dev:  class device struct
 * @buf:                buffer
 *
 * Return value:
 *      number of bytes printed to buffer
 **/
static ssize_t ipr_show_log_level(struct class_device *class_dev, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(class_dev);
        struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
        unsigned long lock_flags = 0;
        int len;

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
        len = snprintf(buf, PAGE_SIZE, "%d\n", ioa_cfg->log_level);
        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
        return len;
}

/**
 * ipr_store_log_level - Change the adapter's error logging level
 * @class_dev:  class device struct
 * @buf:                buffer
 *
 * Return value:
 *      number of bytes printed to buffer
 **/
static ssize_t ipr_store_log_level(struct class_device *class_dev,
                                   const char *buf, size_t count)
{
        struct Scsi_Host *shost = class_to_shost(class_dev);
        struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
        unsigned long lock_flags = 0;

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
        ioa_cfg->log_level = simple_strtoul(buf, NULL, 10);
        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
        return strlen(buf);
}

static struct class_device_attribute ipr_log_level_attr = {
        .attr = {
                .name =         "log_level",
                .mode =         S_IRUGO | S_IWUSR,
        },
        .show = ipr_show_log_level,
        .store = ipr_store_log_level
};

/**
 * ipr_store_diagnostics - IOA Diagnostics interface
 * @class_dev:  class_device struct
 * @buf:                buffer
 * @count:              buffer size
 *
 * This function will reset the adapter and wait a reasonable
 * amount of time for any errors that the adapter might log.
 *
 * Return value:
 *      count on success / other on failure
 **/
static ssize_t ipr_store_diagnostics(struct class_device *class_dev,
                                     const char *buf, size_t count)
{
        struct Scsi_Host *shost = class_to_shost(class_dev);
        struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
        unsigned long lock_flags = 0;
        int rc = count;

        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;

        wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload);
        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
        ioa_cfg->errors_logged = 0;
        ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NORMAL);

        if (ioa_cfg->in_reset_reload) {
                spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
                wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload);

                /* Wait for a second for any errors to be logged */
                msleep(1000);
        } else {
                spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
                return -EIO;
        }

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
        if (ioa_cfg->in_reset_reload || ioa_cfg->errors_logged)
                rc = -EIO;
        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);

        return rc;
}

static struct class_device_attribute ipr_diagnostics_attr = {
        .attr = {
                .name =         "run_diagnostics",
                .mode =         S_IWUSR,
        },
        .store = ipr_store_diagnostics
};

/**
 * ipr_show_adapter_state - Show the adapter's state
 * @class_dev:  class device struct
 * @buf:                buffer
 *
 * Return value:
 *      number of bytes printed to buffer
 **/
static ssize_t ipr_show_adapter_state(struct class_device *class_dev, char *buf)
{
        struct Scsi_Host *shost = class_to_shost(class_dev);
        struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
        unsigned long lock_flags = 0;
        int len;

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
        if (ioa_cfg->ioa_is_dead)
                len = snprintf(buf, PAGE_SIZE, "offline\n");
        else
                len = snprintf(buf, PAGE_SIZE, "online\n");
        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
        return len;
}

/**
 * ipr_store_adapter_state - Change adapter state
 * @class_dev:  class_device struct
 * @buf:                buffer
 * @count:              buffer size
 *
 * This function will change the adapter's state.
 *
 * Return value:
 *      count on success / other on failure
 **/
static ssize_t ipr_store_adapter_state(struct class_device *class_dev,
                                       const char *buf, size_t count)
{
        struct Scsi_Host *shost = class_to_shost(class_dev);
        struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
        unsigned long lock_flags;
        int result = count;

        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
        if (ioa_cfg->ioa_is_dead && !strncmp(buf, "online", 6)) {
                ioa_cfg->ioa_is_dead = 0;
                ioa_cfg->reset_retries = 0;
                ioa_cfg->in_ioa_bringdown = 0;
                ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NONE);
        }
        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
        wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload);

        return result;
}

static struct class_device_attribute ipr_ioa_state_attr = {
        .attr = {
                .name =         "state",
                .mode =         S_IRUGO | S_IWUSR,
        },
        .show = ipr_show_adapter_state,
        .store = ipr_store_adapter_state
};

/**
 * ipr_store_reset_adapter - Reset the adapter
 * @class_dev:  class_device struct
 * @buf:                buffer
 * @count:              buffer size
 *
 * This function will reset the adapter.
 *
 * Return value:
 *      count on success / other on failure
 **/
static ssize_t ipr_store_reset_adapter(struct class_device *class_dev,
                                       const char *buf, size_t count)
{
        struct Scsi_Host *shost = class_to_shost(class_dev);
        struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
        unsigned long lock_flags;
        int result = count;

        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
        if (!ioa_cfg->in_reset_reload)
                ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NORMAL);
        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
        wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload);

        return result;
}

static struct class_device_attribute ipr_ioa_reset_attr = {
        .attr = {
                .name =         "reset_host",
                .mode =         S_IWUSR,
        },
        .store = ipr_store_reset_adapter
};

/**
 * ipr_alloc_ucode_buffer - Allocates a microcode download buffer
 * @buf_len:            buffer length
 *
 * Allocates a DMA'able buffer in chunks and assembles a scatter/gather
 * list to use for microcode download
 *
 * Return value:
 *      pointer to sglist / NULL on failure
 **/
static struct ipr_sglist *ipr_alloc_ucode_buffer(int buf_len)
{
        int sg_size, order, bsize_elem, num_elem, i, j;
        struct ipr_sglist *sglist;
        struct scatterlist *scatterlist;
        struct page *page;

        /* Get the minimum size per scatter/gather element */
        sg_size = buf_len / (IPR_MAX_SGLIST - 1);

        /* Get the actual size per element */
        order = get_order(sg_size);

        /* Determine the actual number of bytes per element */
        bsize_elem = PAGE_SIZE * (1 << order);

        /* Determine the actual number of sg entries needed */
        if (buf_len % bsize_elem)
                num_elem = (buf_len / bsize_elem) + 1;
        else
                num_elem = buf_len / bsize_elem;

        /* Allocate a scatter/gather list for the DMA */
        sglist = kzalloc(sizeof(struct ipr_sglist) +
                         (sizeof(struct scatterlist) * (num_elem - 1)),
                         GFP_KERNEL);

        if (sglist == NULL) {
                ipr_trace;
                return NULL;
        }

        scatterlist = sglist->scatterlist;

        sglist->order = order;
        sglist->num_sg = num_elem;

        /* Allocate a bunch of sg elements */
        for (i = 0; i < num_elem; i++) {
                page = alloc_pages(GFP_KERNEL, order);
                if (!page) {
                        ipr_trace;

                        /* Free up what we already allocated */
                        for (j = i - 1; j >= 0; j--)
                                __free_pages(scatterlist[j].page, order);
                        kfree(sglist);
                        return NULL;
                }

                scatterlist[i].page = page;
        }

        return sglist;
}

/**
 * ipr_free_ucode_buffer - Frees a microcode download buffer
 * @p_dnld:             scatter/gather list pointer
 *
 * Free a DMA'able ucode download buffer previously allocated with
 * ipr_alloc_ucode_buffer
 *
 * Return value:
 *      nothing
 **/
static void ipr_free_ucode_buffer(struct ipr_sglist *sglist)
{
        int i;

        for (i = 0; i < sglist->num_sg; i++)
                __free_pages(sglist->scatterlist[i].page, sglist->order);

        kfree(sglist);
}

/**
 * ipr_copy_ucode_buffer - Copy user buffer to kernel buffer
 * @sglist:             scatter/gather list pointer
 * @buffer:             buffer pointer
 * @len:                buffer length
 *
 * Copy a microcode image from a user buffer into a buffer allocated by
 * ipr_alloc_ucode_buffer
 *
 * Return value:
 *      0 on success / other on failure
 **/
static int ipr_copy_ucode_buffer(struct ipr_sglist *sglist,
                                 u8 *buffer, u32 len)
{
        int bsize_elem, i, result = 0;
        struct scatterlist *scatterlist;
        void *kaddr;

        /* Determine the actual number of bytes per element */
        bsize_elem = PAGE_SIZE * (1 << sglist->order);

        scatterlist = sglist->scatterlist;

        for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) {
                kaddr = kmap(scatterlist[i].page);
                memcpy(kaddr, buffer, bsize_elem);
                kunmap(scatterlist[i].page);

                scatterlist[i].length = bsize_elem;

                if (result != 0) {
                        ipr_trace;
                        return result;
                }
        }

        if (len % bsize_elem) {
                kaddr = kmap(scatterlist[i].page);
                memcpy(kaddr, buffer, len % bsize_elem);
                kunmap(scatterlist[i].page);

                scatterlist[i].length = len % bsize_elem;
        }

        sglist->buffer_len = len;
        return result;
}

/**
 * ipr_build_ucode_ioadl - Build a microcode download IOADL
 * @ipr_cmd:    ipr command struct
 * @sglist:             scatter/gather list
 *
 * Builds a microcode download IOA data list (IOADL).
 *
 **/
static void ipr_build_ucode_ioadl(struct ipr_cmnd *ipr_cmd,
                                  struct ipr_sglist *sglist)
{
        struct ipr_ioarcb *ioarcb = &ipr_cmd->ioarcb;
        struct ipr_ioadl_desc *ioadl = ipr_cmd->ioadl;
        struct scatterlist *scatterlist = sglist->scatterlist;
        int i;

        ipr_cmd->dma_use_sg = sglist->num_dma_sg;
        ioarcb->cmd_pkt.flags_hi |= IPR_FLAGS_HI_WRITE_NOT_READ;
        ioarcb->write_data_transfer_length = cpu_to_be32(sglist->buffer_len);
        ioarcb->write_ioadl_len =
                cpu_to_be32(sizeof(struct ipr_ioadl_desc) * ipr_cmd->dma_use_sg);

        for (i = 0; i < ipr_cmd->dma_use_sg; i++) {
                ioadl[i].flags_and_data_len =
                        cpu_to_be32(IPR_IOADL_FLAGS_WRITE | sg_dma_len(&scatterlist[i]));
                ioadl[i].address =
                        cpu_to_be32(sg_dma_address(&scatterlist[i]));
        }

        ioadl[i-1].flags_and_data_len |=
                cpu_to_be32(IPR_IOADL_FLAGS_LAST);
}

/**
 * ipr_update_ioa_ucode - Update IOA's microcode
 * @ioa_cfg:    ioa config struct
 * @sglist:             scatter/gather list
 *
 * Initiate an adapter reset to update the IOA's microcode
 *
 * Return value:
 *      0 on success / -EIO on failure
 **/
static int ipr_update_ioa_ucode(struct ipr_ioa_cfg *ioa_cfg,
                                struct ipr_sglist *sglist)
{
        unsigned long lock_flags;

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);

        if (ioa_cfg->ucode_sglist) {
                spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
                dev_err(&ioa_cfg->pdev->dev,
                        "Microcode download already in progress\n");
                return -EIO;
        }

        sglist->num_dma_sg = pci_map_sg(ioa_cfg->pdev, sglist->scatterlist,
                                        sglist->num_sg, DMA_TO_DEVICE);

        if (!sglist->num_dma_sg) {
                spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
                dev_err(&ioa_cfg->pdev->dev,
                        "Failed to map microcode download buffer!\n");
                return -EIO;
        }

        ioa_cfg->ucode_sglist = sglist;
        ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NORMAL);
        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
        wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload);

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
        ioa_cfg->ucode_sglist = NULL;
        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
        return 0;
}

/**
 * ipr_store_update_fw - Update the firmware on the adapter
 * @class_dev:  class_device struct
 * @buf:                buffer
 * @count:              buffer size
 *
 * This function will update the firmware on the adapter.
 *
 * Return value:
 *      count on success / other on failure
 **/
static ssize_t ipr_store_update_fw(struct class_device *class_dev,
                                       const char *buf, size_t count)
{
        struct Scsi_Host *shost = class_to_shost(class_dev);
        struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
        struct ipr_ucode_image_header *image_hdr;
        const struct firmware *fw_entry;
        struct ipr_sglist *sglist;
        char fname[100];
        char *src;
        int len, result, dnld_size;

        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;

        len = snprintf(fname, 99, "%s", buf);
        fname[len-1] = '\0';

        if(request_firmware(&fw_entry, fname, &ioa_cfg->pdev->dev)) {
                dev_err(&ioa_cfg->pdev->dev, "Firmware file %s not found\n", fname);
                return -EIO;
        }

        image_hdr = (struct ipr_ucode_image_header *)fw_entry->data;

        if (be32_to_cpu(image_hdr->header_length) > fw_entry->size ||
            (ioa_cfg->vpd_cbs->page3_data.card_type &&
             ioa_cfg->vpd_cbs->page3_data.card_type != image_hdr->card_type)) {
                dev_err(&ioa_cfg->pdev->dev, "Invalid microcode buffer\n");
                release_firmware(fw_entry);
                return -EINVAL;
        }

        src = (u8 *)image_hdr + be32_to_cpu(image_hdr->header_length);
        dnld_size = fw_entry->size - be32_to_cpu(image_hdr->header_length);
        sglist = ipr_alloc_ucode_buffer(dnld_size);

        if (!sglist) {
                dev_err(&ioa_cfg->pdev->dev, "Microcode buffer allocation failed\n");
                release_firmware(fw_entry);
                return -ENOMEM;
        }

        result = ipr_copy_ucode_buffer(sglist, src, dnld_size);

        if (result) {
                dev_err(&ioa_cfg->pdev->dev,
                        "Microcode buffer copy to DMA buffer failed\n");
                goto out;
        }

        result = ipr_update_ioa_ucode(ioa_cfg, sglist);

        if (!result)
                result = count;
out:
        ipr_free_ucode_buffer(sglist);
        release_firmware(fw_entry);
        return result;
}

static struct class_device_attribute ipr_update_fw_attr = {
        .attr = {
                .name =         "update_fw",
                .mode =         S_IWUSR,
        },
        .store = ipr_store_update_fw
};

static struct class_device_attribute *ipr_ioa_attrs[] = {
        &ipr_fw_version_attr,
        &ipr_log_level_attr,
        &ipr_diagnostics_attr,
        &ipr_ioa_state_attr,
        &ipr_ioa_reset_attr,
        &ipr_update_fw_attr,
        &ipr_ioa_cache_attr,
        NULL,
};

#ifdef CONFIG_SCSI_IPR_DUMP
/**
 * ipr_read_dump - Dump the adapter
 * @kobj:               kobject struct
 * @buf:                buffer
 * @off:                offset
 * @count:              buffer size
 *
 * Return value:
 *      number of bytes printed to buffer
 **/
static ssize_t ipr_read_dump(struct kobject *kobj, char *buf,
                              loff_t off, size_t count)
{
        struct class_device *cdev = container_of(kobj,struct class_device,kobj);
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
        struct ipr_dump *dump;
        unsigned long lock_flags = 0;
        char *src;
        int len;
        size_t rc = count;

        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
        dump = ioa_cfg->dump;

        if (ioa_cfg->sdt_state != DUMP_OBTAINED || !dump) {
                spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
                return 0;
        }
        kref_get(&dump->kref);
        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);

        if (off > dump->driver_dump.hdr.len) {
                kref_put(&dump->kref, ipr_release_dump);
                return 0;
        }

        if (off + count > dump->driver_dump.hdr.len) {
                count = dump->driver_dump.hdr.len - off;
                rc = count;
        }

        if (count && off < sizeof(dump->driver_dump)) {
                if (off + count > sizeof(dump->driver_dump))
                        len = sizeof(dump->driver_dump) - off;
                else
                        len = count;
                src = (u8 *)&dump->driver_dump + off;
                memcpy(buf, src, len);
                buf += len;
                off += len;
                count -= len;
        }

        off -= sizeof(dump->driver_dump);

        if (count && off < offsetof(struct ipr_ioa_dump, ioa_data)) {
                if (off + count > offsetof(struct ipr_ioa_dump, ioa_data))
                        len = offsetof(struct ipr_ioa_dump, ioa_data) - off;
                else
                        len = count;
                src = (u8 *)&dump->ioa_dump + off;
                memcpy(buf, src, len);
                buf += len;
                off += len;
                count -= len;
        }

        off -= offsetof(struct ipr_ioa_dump, ioa_data);

        while (count) {
                if ((off & PAGE_MASK) != ((off + count) & PAGE_MASK))
                        len = PAGE_ALIGN(off) - off;
                else
                        len = count;
                src = (u8 *)dump->ioa_dump.ioa_data[(off & PAGE_MASK) >> PAGE_SHIFT];
                src += off & ~PAGE_MASK;
                memcpy(buf, src, len);
                buf += len;
                off += len;
                count -= len;
        }

        kref_put(&dump->kref, ipr_release_dump);
        return rc;
}

/**
 * ipr_alloc_dump - Prepare for adapter dump
 * @ioa_cfg:    ioa config struct
 *
 * Return value:
 *      0 on success / other on failure
 **/
static int ipr_alloc_dump(struct ipr_ioa_cfg *ioa_cfg)
{
        struct ipr_dump *dump;
        unsigned long lock_flags = 0;

        dump = kzalloc(sizeof(struct ipr_dump), GFP_KERNEL);

        if (!dump) {
                ipr_err("Dump memory allocation failed\n");
                return -ENOMEM;
        }

        kref_init(&dump->kref);
        dump->ioa_cfg = ioa_cfg;

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);

        if (INACTIVE != ioa_cfg->sdt_state) {
                spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
                kfree(dump);
                return 0;
        }

        ioa_cfg->dump = dump;
        ioa_cfg->sdt_state = WAIT_FOR_DUMP;
        if (ioa_cfg->ioa_is_dead && !ioa_cfg->dump_taken) {
                ioa_cfg->dump_taken = 1;
                schedule_work(&ioa_cfg->work_q);
        }
        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);

        return 0;
}

/**
 * ipr_free_dump - Free adapter dump memory
 * @ioa_cfg:    ioa config struct
 *
 * Return value:
 *      0 on success / other on failure
 **/
static int ipr_free_dump(struct ipr_ioa_cfg *ioa_cfg)
{
        struct ipr_dump *dump;
        unsigned long lock_flags = 0;

        ENTER;

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
        dump = ioa_cfg->dump;
        if (!dump) {
                spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
                return 0;
        }

        ioa_cfg->dump = NULL;
        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);

        kref_put(&dump->kref, ipr_release_dump);

        LEAVE;
        return 0;
}

/**
 * ipr_write_dump - Setup dump state of adapter
 * @kobj:               kobject struct
 * @buf:                buffer
 * @off:                offset
 * @count:              buffer size
 *
 * Return value:
 *      number of bytes printed to buffer
 **/
static ssize_t ipr_write_dump(struct kobject *kobj, char *buf,
                              loff_t off, size_t count)
{
        struct class_device *cdev = container_of(kobj,struct class_device,kobj);
        struct Scsi_Host *shost = class_to_shost(cdev);
        struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
        int rc;

        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;

        if (buf[0] == '1')
                rc = ipr_alloc_dump(ioa_cfg);
        else if (buf[0] == '0')
                rc = ipr_free_dump(ioa_cfg);
        else
                return -EINVAL;

        if (rc)
                return rc;
        else
                return count;
}

static struct bin_attribute ipr_dump_attr = {
        .attr = {
                .name = "dump",
                .mode = S_IRUSR | S_IWUSR,
        },
        .size = 0,
        .read = ipr_read_dump,
        .write = ipr_write_dump
};
#else
static int ipr_free_dump(struct ipr_ioa_cfg *ioa_cfg) { return 0; };
#endif

/**
 * ipr_change_queue_depth - Change the device's queue depth
 * @sdev:       scsi device struct
 * @qdepth:     depth to set
 *
 * Return value:
 *      actual depth set
 **/
static int ipr_change_queue_depth(struct scsi_device *sdev, int qdepth)
{
        struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)sdev->host->hostdata;
        struct ipr_resource_entry *res;
        unsigned long lock_flags = 0;

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
        res = (struct ipr_resource_entry *)sdev->hostdata;

        if (res && ipr_is_gata(res) && qdepth > IPR_MAX_CMD_PER_ATA_LUN)
                qdepth = IPR_MAX_CMD_PER_ATA_LUN;
        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);

        scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
        return sdev->queue_depth;
}

/**
 * ipr_change_queue_type - Change the device's queue type
 * @dsev:               scsi device struct
 * @tag_type:   type of tags to use
 *
 * Return value:
 *      actual queue type set
 **/
static int ipr_change_queue_type(struct scsi_device *sdev, int tag_type)
{
        struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)sdev->host->hostdata;
        struct ipr_resource_entry *res;
        unsigned long lock_flags = 0;

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
        res = (struct ipr_resource_entry *)sdev->hostdata;

        if (res) {
                if (ipr_is_gscsi(res) && sdev->tagged_supported) {
                        /*
                         * We don't bother quiescing the device here since the
                         * adapter firmware does it for us.
                         */
                        scsi_set_tag_type(sdev, tag_type);

                        if (tag_type)
                                scsi_activate_tcq(sdev, sdev->queue_depth);
                        else
                                scsi_deactivate_tcq(sdev, sdev->queue_depth);
                } else
                        tag_type = 0;
        } else
                tag_type = 0;

        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
        return tag_type;
}

/**
 * ipr_show_adapter_handle - Show the adapter's resource handle for this device
 * @dev:        device struct
 * @buf:        buffer
 *
 * Return value:
 *      number of bytes printed to buffer
 **/
static ssize_t ipr_show_adapter_handle(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct scsi_device *sdev = to_scsi_device(dev);
        struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)sdev->host->hostdata;
        struct ipr_resource_entry *res;
        unsigned long lock_flags = 0;
        ssize_t len = -ENXIO;

        spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
        res = (struct ipr_resource_entry *)sdev->hostdata;
        if (res)
                len = snprintf(buf, PAGE_SIZE, "%08X\n", res->cfgte.res_handle);
        spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
        return len;
}

static struct device_attribute ipr_adapter_handle_attr = {
        .attr = {
                .name =         "adapter_handle",
                .mode =         S_IRUSR,
        },
        .show = ipr_show_adapter_handle
};

static struct device_attribute *ipr_dev_attrs[] = {
        &ipr_adapter_handle_attr,
        NULL,
};

/**
 * ipr_biosparam - Return the HSC mapping
 * @sdev:                       scsi device struct
 * @block_device:       block device pointer
 * @capacity:           capacity of the device
 * @parm:                       Array containing returned HSC values.
 *
 * This function generates the HSC parms that fdisk uses.
 * We want to make sure we return something that places partitions
 * on 4k boundaries for best performance with the IOA.
 *
 * Return value:
 *      0 on success
 **/
static int ipr_biosparam(struct scsi_device *sdev,
                         struct block_device *block_device,
                         sector_t capacity, int *parm)
{
        int heads, sectors;
        sector_t cylinders;

        heads = 128;
        sectors = 32;

        cylinders = capacity;
        sector_div(cylinders, (128 * 32));

        /* return result */
        parm[0] = heads;
        parm[1] = sectors;
        parm[2] = cylinders;

        return 0;
}

/**
 * ipr_find_starget - Find target based on bus/target.
 * @starget:    scsi target struct
 *
 * Return value:
 *      resource entry pointer if found / NULL if not found
 **/
static struct ipr_resource_entry *ipr_find_starget(struct scsi_target *starget)
{
        struct Scsi_Host *shost = dev_to_shost(&starget->dev);
        struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *) shost->hostdata;
        struct ipr_resource_entry *res;

        list_for_each_entry(res, &ioa_cfg->used_res_q, queue) {
                if ((res->cfgte.res_addr.bus == starget->channel) &&
                    (res->cfgte.res_addr.target == starget->id) &&
                    (res->cfgte.res_addr.lun == 0)) {
                        return res;
                }
        }

        return NULL;