initial commit with v2.6.9

[linux-2.6.9-moxart.git] / arch / ia64 / sn / io / sn2 / pcibr / pcibr_error.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001-2003 Silicon Graphics, Inc. All rights reserved.
 */

#include <linux/types.h>
#include <linux/interrupt.h>
#include <asm/sn/sgi.h>
#include <asm/sn/addrs.h>
#include <asm/sn/iograph.h>
#include <asm/sn/pci/pciio.h>
#include <asm/sn/pci/pcibr.h>
#include <asm/sn/pci/pcibr_private.h>
#include <asm/sn/pci/pci_defs.h>


extern int      hubii_check_widget_disabled(nasid_t, int);


/* =====================================================================
 *    ERROR HANDLING
 */

#ifdef  DEBUG
#ifdef  ERROR_DEBUG
#define BRIDGE_PIOERR_TIMEOUT   100     /* Timeout with ERROR_DEBUG defined */
#else
#define BRIDGE_PIOERR_TIMEOUT   40      /* Timeout in debug mode  */
#endif
#else
#define BRIDGE_PIOERR_TIMEOUT   1       /* Timeout in non-debug mode */
#endif

#ifdef  DEBUG
#ifdef ERROR_DEBUG
uint64_t bridge_errors_to_dump = ~BRIDGE_ISR_INT_MSK;
#else
uint64_t bridge_errors_to_dump = BRIDGE_ISR_ERROR_DUMP;
#endif
#else
uint64_t bridge_errors_to_dump = BRIDGE_ISR_ERROR_FATAL |
                                   BRIDGE_ISR_PCIBUS_PIOERR;
#endif

int pcibr_pioerr_dump = 1;      /* always dump pio errors */

/*
 * register values
 * map between numeric values and symbolic values
 */
struct reg_values {
        unsigned long long rv_value;
        char *rv_name;
};

/*
 * register descriptors are used for formatted prints of register values
 * rd_mask and rd_shift must be defined, other entries may be null
 */
struct reg_desc {
        unsigned long long rd_mask;     /* mask to extract field */
        int rd_shift;           /* shift for extracted value, - >>, + << */
        char *rd_name;          /* field name */
        char *rd_format;        /* format to print field */
        struct reg_values *rd_values;   /* symbolic names of values */
};

/* Crosstalk Packet Types */
static struct reg_values xtalk_cmd_pactyp[] =
{
    {0x0, "RdReq"},
    {0x1, "RdResp"},
    {0x2, "WrReqWithResp"},
    {0x3, "WrResp"},
    {0x4, "WrReqNoResp"},
    {0x5, "Reserved(5)"},
    {0x6, "FetchAndOp"},
    {0x7, "Reserved(7)"},
    {0x8, "StoreAndOp"},
    {0x9, "Reserved(9)"},
    {0xa, "Reserved(a)"},
    {0xb, "Reserved(b)"},
    {0xc, "Reserved(c)"},
    {0xd, "Reserved(d)"},
    {0xe, "SpecialReq"},
    {0xf, "SpecialResp"},
    {0}
};

static struct reg_desc   xtalk_cmd_bits[] =
{
    {WIDGET_DIDN, -28, "DIDN", "%x"},
    {WIDGET_SIDN, -24, "SIDN", "%x"},
    {WIDGET_PACTYP, -20, "PACTYP", 0, xtalk_cmd_pactyp},
    {WIDGET_TNUM, -15, "TNUM", "%x"},
    {WIDGET_COHERENT, 0, "COHERENT"},
    {WIDGET_DS, 0, "DS"},
    {WIDGET_GBR, 0, "GBR"},
    {WIDGET_VBPM, 0, "VBPM"},
    {WIDGET_ERROR, 0, "ERROR"},
    {WIDGET_BARRIER, 0, "BARRIER"},
    {0}
};

#define F(s,n)          { 1l<<(s),-(s), n }

char *pci_space[] = {"NONE",
                     "ROM",
                     "IO",
                     "",
                     "MEM",
                     "MEM32",
                     "MEM64",
                     "CFG",
                     "WIN0",
                     "WIN1",
                     "WIN2",
                     "WIN3",
                     "WIN4",
                     "WIN5",
                     "",
                     "BAD"};

static char             *pcibr_isr_errs[] =
{
    "", "", "", "", "", "", "", "",
    "08: Reserved Bit 08",
    "09: PCI to Crosstalk read request timeout",
    "10: PCI retry operation count exhausted.",
    "11: PCI bus device select timeout",
    "12: PCI device reported parity error",
    "13: PCI Address/Cmd parity error ",
    "14: PCI Bridge detected parity error",
    "15: PCI abort condition",
    "16: Reserved Bit 16",
    "17: LLP Transmitter Retry count wrapped",  /* PIC ONLY */
    "18: LLP Transmitter side required Retry",  /* PIC ONLY */
    "19: LLP Receiver retry count wrapped",     /* PIC ONLY */
    "20: LLP Receiver check bit error",         /* PIC ONLY */
    "21: LLP Receiver sequence number error",   /* PIC ONLY */
    "22: Request packet overflow",
    "23: Request operation not supported by bridge",
    "24: Request packet has invalid address for bridge widget",
    "25: Incoming request xtalk command word error bit set or invalid sideband",
    "26: Incoming response xtalk command word error bit set or invalid sideband",
    "27: Framing error, request cmd data size does not match actual",
    "28: Framing error, response cmd data size does not match actual",
    "29: Unexpected response arrived",
    "30: PMU Access Fault",
    "31: Reserved Bit 31",
    "32: PCI-X address or attribute cycle parity error",
    "33: PCI-X data cycle parity error",
    "34: PCI-X master timeout (ie. master abort)",
    "35: PCI-X pio retry counter exhausted",
    "36: PCI-X SERR",
    "37: PCI-X PERR", 
    "38: PCI-X target abort",
    "39: PCI-X read request timeout",
    "40: PCI / PCI-X device requestin arbitration error",
    "41: internal RAM parity error",
    "42: PCI-X unexpected completion cycle to master",
    "43: PCI-X split completion timeout",
    "44: PCI-X split completion error message",
    "45: PCI-X split completion message parity error",
};

/*
 * print_register() allows formatted printing of bit fields.  individual
 * bit fields are described by a struct reg_desc, multiple bit fields within
 * a single word can be described by multiple reg_desc structures.
 * %r outputs a string of the format "<bit field descriptions>"
 * %R outputs a string of the format "0x%x<bit field descriptions>"
 *
 * The fields in a reg_desc are:
 *      unsigned long long rd_mask; An appropriate mask to isolate the bit field
 *                              within a word, and'ed with val
 *
 *      int rd_shift;           A shift amount to be done to the isolated
 *                              bit field.  done before printing the isolate
 *                              bit field with rd_format and before searching
 *                              for symbolic value names in rd_values
 *
 *      char *rd_name;          If non-null, a bit field name to label any
 *                              out from rd_format or searching rd_values.
 *                              if neither rd_format or rd_values is non-null
 *                              rd_name is printed only if the isolated
 *                              bit field is non-null.
 *
 *      char *rd_format;        If non-null, the shifted bit field value
 *                              is printed using this format.
 *
 *      struct reg_values *rd_values;   If non-null, a pointer to a table
 *                              matching numeric values with symbolic names.
 *                              rd_values are searched and the symbolic
 *                              value is printed if a match is found, if no
 *                              match is found "???" is printed.
 *                              
 */

static void
print_register(unsigned long long reg, struct reg_desc *addr)
{
        register struct reg_desc *rd;
        register struct reg_values *rv;
        unsigned long long field;
        int any;

        printk("<");
        any = 0;
        for (rd = addr; rd->rd_mask; rd++) {
                field = reg & rd->rd_mask;
                field = (rd->rd_shift > 0) ? field << rd->rd_shift : field >> -rd->rd_shift;
                if (any && (rd->rd_format || rd->rd_values || (rd->rd_name && field)))
                        printk(",");
                if (rd->rd_name) {
                        if (rd->rd_format || rd->rd_values || field) {
                                printk("%s", rd->rd_name);
                                any = 1;
                        }
                        if (rd->rd_format || rd->rd_values) {
                                printk("=");
                                any = 1;
                        }
                }
                /* You can have any format so long as it is %x */
                if (rd->rd_format) {
                        printk("%llx", field);
                        any = 1;
                        if (rd->rd_values)
                                printk(":");
                }
                if (rd->rd_values) {
                        any = 1;
                        for (rv = rd->rd_values; rv->rv_name; rv++) {
                                if (field == rv->rv_value) {
                                        printk("%s", rv->rv_name);
                                        break;
                                }
                        }
                        if (rv->rv_name == NULL)
                                printk("???");
                }
        }
        printk(">\n");
}


/*
 * display memory directory state
 */
static void
pcibr_show_dir_state(paddr_t paddr, char *prefix)
{
#ifdef PCIBR_LATER
        int state;
        uint64_t vec_ptr;
        hubreg_t elo;
        extern char *dir_state_str[];
        extern void get_dir_ent(paddr_t, int *, uint64_t *, hubreg_t *);

        get_dir_ent(paddr, &state, &vec_ptr, &elo);

        printf("%saddr 0x%lx: state 0x%x owner 0x%lx (%s)\n", 
                prefix, (uint64_t)paddr, state, (uint64_t)vec_ptr, 
                dir_state_str[state]);
#endif /* PCIBR_LATER */
}


void
print_bridge_errcmd(pcibr_soft_t pcibr_soft, uint32_t cmdword, char *errtype)
{
    printk(
            "\t    Bridge %sError Command Word Register ", errtype);
    print_register(cmdword, xtalk_cmd_bits);
}


/*
 *      Dump relevant error information for Bridge error interrupts.
 */
/*ARGSUSED */
void
pcibr_error_dump(pcibr_soft_t pcibr_soft)
{
    uint64_t                int_status;
    uint64_t                mult_int;
    uint64_t                bit;
    int                     i;

    int_status = (pcireg_intr_status_get(pcibr_soft) & ~BRIDGE_ISR_INT_MSK);

    if (!int_status) {
        /* No error bits set */
        return;
    }

    /* Check if dumping the same error information multiple times */
    if ( pcibr_soft->bs_errinfo.bserr_intstat == int_status )
        return;
    pcibr_soft->bs_errinfo.bserr_intstat = int_status;

    printk(KERN_ALERT "PCI BRIDGE ERROR: int_status is 0x%lx for %s\n"
        "    Dumping relevant %s registers for each bit set...\n",
            int_status, pcibr_soft->bs_name,
            "PIC");

    for (i = PCIBR_ISR_ERR_START; i < 64; i++) {
        bit = 1ull << i;

        /* A number of int_status bits are only valid for PIC's bus0 */
        if ((pcibr_soft->bs_busnum != 0) && 
            ((bit == BRIDGE_ISR_UNSUPPORTED_XOP) ||
             (bit == BRIDGE_ISR_LLP_REC_SNERR) ||
             (bit == BRIDGE_ISR_LLP_REC_CBERR) ||
             (bit == BRIDGE_ISR_LLP_RCTY) ||
             (bit == BRIDGE_ISR_LLP_TX_RETRY) ||
             (bit == BRIDGE_ISR_LLP_TCTY))) {
            continue;
        }

        if (int_status & bit) {
            printk("\t%s\n", pcibr_isr_errs[i]);

            switch (bit) {

            case PIC_ISR_INT_RAM_PERR:      /* bit41    INT_RAM_PERR */
                /* XXX: should breakdown meaning of bits in reg */
                printk("\t      Internal RAM Parity Error: 0x%lx\n",
                    pcireg_parity_err_get(pcibr_soft));
                break;

            case PIC_ISR_PCIX_ARB_ERR:      /* bit40    PCI_X_ARB_ERR */
                /* XXX: should breakdown meaning of bits in reg */
                printk("\t      Arbitration Reg: 0x%lx\n",
                    pcireg_arbitration_get(pcibr_soft));
                break;

            case PIC_ISR_PCIX_REQ_TOUT:     /* bit39    PCI_X_REQ_TOUT */
                /* XXX: should breakdown meaning of attribute bit */
                printk(
                    "\t    PCI-X DMA Request Error Address Reg: 0x%lx\n"
                    "\t    PCI-X DMA Request Error Attribute Reg: 0x%lx\n",
                    pcireg_pcix_req_err_addr_get(pcibr_soft),
                    pcireg_pcix_req_err_attr_get(pcibr_soft));
                break;

            case PIC_ISR_PCIX_SPLIT_MSG_PE: /* bit45    PCI_X_SPLIT_MES_PE */
            case PIC_ISR_PCIX_SPLIT_EMSG:   /* bit44    PCI_X_SPLIT_EMESS */
            case PIC_ISR_PCIX_SPLIT_TO:     /* bit43    PCI_X_SPLIT_TO */
                /* XXX: should breakdown meaning of attribute bit */
                printk(
                    "\t    PCI-X Split Request Address Reg: 0x%lx\n"
                    "\t    PCI-X Split Request Attribute Reg: 0x%lx\n",
                    pcireg_pcix_pio_split_addr_get(pcibr_soft),
                    pcireg_pcix_pio_split_attr_get(pcibr_soft));
                /* FALL THRU */

            case PIC_ISR_PCIX_UNEX_COMP:    /* bit42    PCI_X_UNEX_COMP */
            case PIC_ISR_PCIX_TABORT:       /* bit38    PCI_X_TABORT */
            case PIC_ISR_PCIX_PERR:         /* bit37    PCI_X_PERR */
            case PIC_ISR_PCIX_SERR:         /* bit36    PCI_X_SERR */
            case PIC_ISR_PCIX_MRETRY:       /* bit35    PCI_X_MRETRY */
            case PIC_ISR_PCIX_MTOUT:        /* bit34    PCI_X_MTOUT */
            case PIC_ISR_PCIX_DA_PARITY:    /* bit33    PCI_X_DA_PARITY */
            case PIC_ISR_PCIX_AD_PARITY:    /* bit32    PCI_X_AD_PARITY */
                /* XXX: should breakdown meaning of attribute bit */
                printk(
                    "\t    PCI-X Bus Error Address Reg: 0x%lx\n"
                    "\t    PCI-X Bus Error Attribute Reg: 0x%lx\n"
                    "\t    PCI-X Bus Error Data Reg: 0x%lx\n",
                    pcireg_pcix_bus_err_addr_get(pcibr_soft),
                    pcireg_pcix_bus_err_attr_get(pcibr_soft),
                    pcireg_pcix_bus_err_data_get(pcibr_soft));
                break;

            case BRIDGE_ISR_PAGE_FAULT: /* bit30    PMU_PAGE_FAULT */
                printk("\t    Map Fault Address Reg: 0x%lx\n",
                    pcireg_map_fault_get(pcibr_soft));
                break;

            case BRIDGE_ISR_UNEXP_RESP:         /* bit29    UNEXPECTED_RESP */
                print_bridge_errcmd(pcibr_soft,
                            pcireg_linkside_err_get(pcibr_soft), "Aux ");

                /* PIC in PCI-X mode, dump the PCIX DMA Request registers */
                if (IS_PCIX(pcibr_soft)) {
                    /* XXX: should breakdown meaning of attr bit */
                    printk( 
                        "\t    PCI-X DMA Request Error Addr Reg: 0x%lx\n"
                        "\t    PCI-X DMA Request Error Attr Reg: 0x%lx\n",
                        pcireg_pcix_req_err_addr_get(pcibr_soft),
                        pcireg_pcix_req_err_attr_get(pcibr_soft));
                }
                break;

            case BRIDGE_ISR_BAD_XRESP_PKT:      /* bit28    BAD_RESP_PACKET */
            case BRIDGE_ISR_RESP_XTLK_ERR:      /* bit26    RESP_XTALK_ERROR */
                print_bridge_errcmd(pcibr_soft,
                                pcireg_linkside_err_get(pcibr_soft), "Aux ");
                 
                /* PCI-X mode, DMA Request Error registers are valid.  But
                 * in PCI mode, Response Buffer Address register are valid.
                 */
                if (IS_PCIX(pcibr_soft)) {
                    /* XXX: should breakdown meaning of attribute bit */
                    printk(
                        "\t    PCI-X DMA Request Error Addr Reg: 0x%lx\n"
                        "\t    PCI-X DMA Request Error Attribute Reg: 0x%lx\n",
                        pcireg_pcix_req_err_addr_get(pcibr_soft),
                        pcireg_pcix_req_err_attr_get(pcibr_soft));
                } else {
                    printk(
                        "\t    Bridge Response Buf Error Addr Reg: 0x%lx\n"
                        "\t    dev-num %d buff-num %d addr 0x%lx\n",
                        pcireg_resp_err_get(pcibr_soft),
                        (int)pcireg_resp_err_dev_get(pcibr_soft),
                        (int)pcireg_resp_err_buf_get(pcibr_soft),
                        pcireg_resp_err_addr_get(pcibr_soft));
                    if (bit == BRIDGE_ISR_RESP_XTLK_ERR) {
                        /* display memory directory associated with cacheline */
                        pcibr_show_dir_state(
                                    pcireg_resp_err_get(pcibr_soft), "\t    ");
                    }
                }
                break;

            case BRIDGE_ISR_BAD_XREQ_PKT:       /* bit27    BAD_XREQ_PACKET */
            case BRIDGE_ISR_REQ_XTLK_ERR:       /* bit25    REQ_XTALK_ERROR */
            case BRIDGE_ISR_INVLD_ADDR:         /* bit24    INVALID_ADDRESS */
                print_bridge_errcmd(pcibr_soft,
                                pcireg_cmdword_err_get(pcibr_soft), "");
                printk(
                    "\t    Bridge Error Address Register: 0x%lx\n"
                    "\t    Bridge Error Address: 0x%lx\n",
                    pcireg_bus_err_get(pcibr_soft),
                    pcireg_bus_err_get(pcibr_soft));
                break;

            case BRIDGE_ISR_UNSUPPORTED_XOP:    /* bit23    UNSUPPORTED_XOP */
                print_bridge_errcmd(pcibr_soft,
                                pcireg_linkside_err_get(pcibr_soft), "Aux ");
                printk("\t    Address Holding Link Side Error Reg: 0x%lx\n",
                        pcireg_linkside_err_addr_get(pcibr_soft));
                break;

            case BRIDGE_ISR_XREQ_FIFO_OFLOW:    /* bit22    XREQ_FIFO_OFLOW */
                print_bridge_errcmd(pcibr_soft,
                                pcireg_linkside_err_get(pcibr_soft), "Aux ");
                printk("\t    Address Holding Link Side Error Reg: 0x%lx\n",
                        pcireg_linkside_err_addr_get(pcibr_soft));
                break;

            case BRIDGE_ISR_PCI_ABORT:          /* bit15    PCI_ABORT */
            case BRIDGE_ISR_PCI_PARITY:         /* bit14    PCI_PARITY */
            case BRIDGE_ISR_PCI_SERR:           /* bit13    PCI_SERR */
            case BRIDGE_ISR_PCI_PERR:           /* bit12    PCI_PERR */
            case BRIDGE_ISR_PCI_MST_TIMEOUT:    /* bit11    PCI_MASTER_TOUT */
            case BRIDGE_ISR_PCI_RETRY_CNT:      /* bit10    PCI_RETRY_CNT */
                printk("\t    PCI Error Address Register: 0x%lx\n"
                    "\t    PCI Error Address: 0x%lx\n",
                    pcireg_pci_bus_addr_get(pcibr_soft),
                    pcireg_pci_bus_addr_addr_get(pcibr_soft));
                break;

            case BRIDGE_ISR_XREAD_REQ_TIMEOUT:  /* bit09    XREAD_REQ_TOUT */
                printk("\t    Bridge Response Buf Error Addr Reg: 0x%lx\n"
                    "\t    dev-num %d buff-num %d addr 0x%lx\n",
                    pcireg_resp_err_get(pcibr_soft),
                    (int)pcireg_resp_err_dev_get(pcibr_soft),
                    (int)pcireg_resp_err_buf_get(pcibr_soft),
                    pcireg_resp_err_get(pcibr_soft));
                break;
            }
        }
    }

    mult_int = pcireg_intr_multiple_get(pcibr_soft);

    if (mult_int & ~BRIDGE_ISR_INT_MSK) {
        printk("    %s Multiple Interrupt Register is 0x%lx\n",
                pcibr_soft->bs_asic_name, mult_int);
        for (i = PCIBR_ISR_ERR_START; i < 64; i++) {
            if (mult_int & (1ull << i))
                printk( "\t%s\n", pcibr_isr_errs[i]);
        }
    }
}

/* pcibr_pioerr_check():
 *      Check to see if this pcibr has a PCI PIO
 *      TIMEOUT error; if so, bump the timeout-count
 *      on any piomaps that could cover the address.
 */
static void
pcibr_pioerr_check(pcibr_soft_t soft)
{
    uint64_t                int_status;
    iopaddr_t               pci_addr;
    pciio_slot_t            slot;
    pcibr_piomap_t          map;
    iopaddr_t               base;
    size_t                  size;
    unsigned                win;
    int                     func;

    int_status = pcireg_intr_status_get(soft);

    if (int_status & BRIDGE_ISR_PCIBUS_PIOERR) {
        pci_addr = pcireg_pci_bus_addr_get(soft);

        slot = PCIBR_NUM_SLOTS(soft);
        while (slot-- > 0) {
            int                 nfunc = soft->bs_slot[slot].bss_ninfo;
            pcibr_info_h        pcibr_infoh = soft->bs_slot[slot].bss_infos;

            for (func = 0; func < nfunc; func++) {
                pcibr_info_t    pcibr_info = pcibr_infoh[func];

                if (!pcibr_info)
                    continue;

                for (map = pcibr_info->f_piomap;
                        map != NULL; map = map->bp_next) {
                    base = map->bp_pciaddr;
                    size = map->bp_mapsz;
                    win = map->bp_space - PCIIO_SPACE_WIN(0);
                    if (win < 6)
                        base += soft->bs_slot[slot].bss_window[win].bssw_base;
                    else if (map->bp_space == PCIIO_SPACE_ROM)
                        base += pcibr_info->f_rbase;
                    if ((pci_addr >= base) && (pci_addr < (base + size)))
                        atomic_inc(&map->bp_toc);
                }
            }
        }
    }
}

/*
 * PCI Bridge Error interrupt handler.
 *      This gets invoked, whenever a PCI bridge sends an error interrupt.
 *      Primarily this servers two purposes.
 *              - If an error can be handled (typically a PIO read/write
 *                error, we try to do it silently.
 *              - If an error cannot be handled, we die violently.
 *      Interrupt due to PIO errors:
 *              - Bridge sends an interrupt, whenever a PCI operation
 *                done by the bridge as the master fails. Operations could
 *                be either a PIO read or a PIO write.
 *                PIO Read operation also triggers a bus error, and it's
 *                We primarily ignore this interrupt in that context..
 *                For PIO write errors, this is the only indication.
 *                and we have to handle with the info from here.
 *
 *                So, there is no way to distinguish if an interrupt is
 *                due to read or write error!.
 */

irqreturn_t
pcibr_error_intr_handler(int irq, void *arg, struct pt_regs *ep)
{
    pcibr_soft_t            pcibr_soft;
    void               *bridge;
    uint64_t                int_status;
    uint64_t                err_status;
    int                     i;
    uint64_t                disable_errintr_mask = 0;
    nasid_t                 nasid;


#if PCIBR_SOFT_LIST
    /*
     * Defensive code for linked pcibr_soft structs
     */
    {
        extern pcibr_list_p     pcibr_list;
        pcibr_list_p            entry;

        entry = pcibr_list;
        while (1) {
            if (entry == NULL) {
                printk("pcibr_error_intr_handler: (0x%lx) is not a pcibr_soft!",
                      (uint64_t)arg);
                return IRQ_NONE;
            }
            if ((intr_arg_t) entry->bl_soft == arg)
                break;
            entry = entry->bl_next;
        }
    }
#endif /* PCIBR_SOFT_LIST */
    pcibr_soft = (pcibr_soft_t) arg;
    bridge = pcibr_soft->bs_base;

    /*
     * pcibr_error_intr_handler gets invoked whenever bridge encounters
     * an error situation, and the interrupt for that error is enabled.
     * This routine decides if the error is fatal or not, and takes
     * action accordingly.
     *
     * In the case of PIO read/write timeouts, there is no way
     * to know if it was a read or write request that timed out.
     * If the error was due to a "read", a bus error will also occur
     * and the bus error handling code takes care of it. 
     * If the error is due to a "write", the error is currently logged 
     * by this routine. For SN1 and SN0, if fire-and-forget mode is 
     * disabled, a write error response xtalk packet will be sent to 
     * the II, which will cause an II error interrupt. No write error 
     * recovery actions of any kind currently take place at the pcibr 
     * layer! (e.g., no panic on unrecovered write error)
     *
     * Prior to reading the Bridge int_status register we need to ensure
     * that there are no error bits set in the lower layers (hubii)
     * that have disabled PIO access to the widget. If so, there is nothing
     * we can do until the bits clear, so we setup a timeout and try again
     * later.
     */

    nasid = NASID_GET(bridge);
    if (hubii_check_widget_disabled(nasid, pcibr_soft->bs_xid)) {
        DECLARE_WAIT_QUEUE_HEAD(wq);
        sleep_on_timeout(&wq, BRIDGE_PIOERR_TIMEOUT*HZ );  /* sleep */
        pcibr_soft->bs_errinfo.bserr_toutcnt++;
        /* Let's go recursive */
        return(pcibr_error_intr_handler(irq, arg, ep));
    }

    int_status = pcireg_intr_status_get(pcibr_soft);

    PCIBR_DEBUG_ALWAYS((PCIBR_DEBUG_INTR_ERROR, pcibr_soft->bs_conn,
                "pcibr_error_intr_handler: int_status=0x%lx\n", int_status));

    /* int_status is which bits we have to clear;
     * err_status is the bits we haven't handled yet.
     */
    err_status = int_status;

    if (!(int_status & ~BRIDGE_ISR_INT_MSK)) {
        /*
         * No error bit set!!.
         */
        return IRQ_HANDLED;
    }
    /*
     * If we have a PCIBUS_PIOERR, hand it to the logger.
     */
    if (int_status & BRIDGE_ISR_PCIBUS_PIOERR) {
        pcibr_pioerr_check(pcibr_soft);
    }

    if (err_status) {
        struct bs_errintr_stat_s *bs_estat ;
        bs_estat = &pcibr_soft->bs_errintr_stat[PCIBR_ISR_ERR_START];

        for (i = PCIBR_ISR_ERR_START; i < 64; i++, bs_estat++) {
            if (err_status & (1ull << i)) {
                uint32_t              errrate = 0;
                uint32_t              errcount = 0;
                uint32_t              errinterval = 0, current_tick = 0;
                int                     llp_tx_retry_errors = 0;
                int                     is_llp_tx_retry_intr = 0;

                bs_estat->bs_errcount_total++;

                current_tick = jiffies;
                errinterval = (current_tick - bs_estat->bs_lasterr_timestamp);
                errcount = (bs_estat->bs_errcount_total -
                            bs_estat->bs_lasterr_snapshot);

                /* LLP interrrupt errors are only valid on BUS0 of the PIC */
                if (pcibr_soft->bs_busnum == 0)
                    is_llp_tx_retry_intr = (BRIDGE_ISR_LLP_TX_RETRY==(1ull << i));

                /* Check for the divide by zero condition while
                 * calculating the error rates.
                 */

                if (errinterval) {
                    errrate = errcount / errinterval;
                    /* If able to calculate error rate
                     * on a LLP transmitter retry interrupt, check
                     * if the error rate is nonzero and we have seen
                     * a certain minimum number of errors.
                     *
                     * NOTE : errcount is being compared to
                     * PCIBR_ERRTIME_THRESHOLD to make sure that we are not
                     * seeing cases like x error interrupts per y ticks for
                     * very low x ,y (x > y ) which could result in a
                     * rate > 100/tick.
                     */
                    if (is_llp_tx_retry_intr &&
                        errrate &&
                        (errcount >= PCIBR_ERRTIME_THRESHOLD)) {
                        llp_tx_retry_errors = 1;
                    }
                } else {
                    errrate = 0;
                    /* Since we are not able to calculate the
                     * error rate check if we exceeded a certain
                     * minimum number of errors for LLP transmitter
                     * retries. Note that this can only happen
                     * within the first tick after the last snapshot.
                     */
                    if (is_llp_tx_retry_intr &&
                        (errcount >= PCIBR_ERRINTR_DISABLE_LEVEL)) {
                        llp_tx_retry_errors = 1;
                    }
                }

                /*
                 * If a non-zero error rate (which is equivalent to
                 * to 100 errors/tick at least) for the LLP transmitter
                 * retry interrupt was seen, check if we should print
                 * a warning message.
                 */

                if (llp_tx_retry_errors) {
                    static uint32_t       last_printed_rate;

                    if (errrate > last_printed_rate) {
                        last_printed_rate = errrate;
                        /* Print the warning only if the error rate
                         * for the transmitter retry interrupt
                         * exceeded the previously printed rate.
                         */
                        printk(KERN_WARNING
                                "%s: %s, Excessive error interrupts : %d/tick\n",
                                pcibr_soft->bs_name,
                                pcibr_isr_errs[i],
                                errrate);

                    }
                    /*
                     * Update snapshot, and time
                     */
                    bs_estat->bs_lasterr_timestamp = current_tick;
                    bs_estat->bs_lasterr_snapshot =
                        bs_estat->bs_errcount_total;

                }
                /*
                 * If the error rate is high enough, print the error rate.
                 */
                if (errinterval > PCIBR_ERRTIME_THRESHOLD) {

                    if (errrate > PCIBR_ERRRATE_THRESHOLD) {
                        printk(KERN_NOTICE "%s: %s, Error rate %d/tick",
                                pcibr_soft->bs_name,
                                pcibr_isr_errs[i],
                                errrate);
                        /*
                         * Update snapshot, and time
                         */
                        bs_estat->bs_lasterr_timestamp = current_tick;
                        bs_estat->bs_lasterr_snapshot =
                            bs_estat->bs_errcount_total;
                    }
                }
                /* PIC BRINGUP WAR (PV# 856155):
                 * Dont disable PCI_X_ARB_ERR interrupts, we need the
                 * interrupt inorder to clear the DEV_BROKE bits in
                 * b_arb register to re-enable the device.
                 */
                if (!(err_status & PIC_ISR_PCIX_ARB_ERR) &&
                                PCIBR_WAR_ENABLED(PV856155, pcibr_soft)) {

                if (bs_estat->bs_errcount_total > PCIBR_ERRINTR_DISABLE_LEVEL) {
                    /*
                     * We have seen a fairly large number of errors of
                     * this type. Let's disable the interrupt. But flash
                     * a message about the interrupt being disabled.
                     */
                    printk(KERN_NOTICE
                            "%s Disabling error interrupt type %s. Error count %d",
                            pcibr_soft->bs_name,
                            pcibr_isr_errs[i],
                            bs_estat->bs_errcount_total);
                    disable_errintr_mask |= (1ull << i);
                }
                } /* PIC: WAR for PV 856155 end-of-if */
            }
        }
    }

    if (disable_errintr_mask) {
        unsigned long s;
        /*
         * Disable some high frequency errors as they
         * could eat up too much cpu time.
         */
        s = pcibr_lock(pcibr_soft);
        pcireg_intr_enable_bit_clr(pcibr_soft, disable_errintr_mask);
        pcibr_unlock(pcibr_soft, s);
    }
    /*
     * If we leave the PROM cacheable, T5 might
     * try to do a cache line sized writeback to it,
     * which will cause a BRIDGE_ISR_INVLD_ADDR.
     */
    if ((err_status & BRIDGE_ISR_INVLD_ADDR) &&
        (0x00C00000 == (pcireg_bus_err_get(pcibr_soft) & 0xFFFFFFFFFFC00000)) &&
        (0x00402000 == (0x00F07F00 & pcireg_cmdword_err_get(pcibr_soft)))) {
        err_status &= ~BRIDGE_ISR_INVLD_ADDR;
    }
    /*
     * pcibr_pioerr_dump is a systune that make be used to not
     * print bridge registers for interrupts generated by pio-errors.
     * Some customers do early probes and expect a lot of failed
     * pios.
     */
    if (!pcibr_pioerr_dump) {
        bridge_errors_to_dump &= ~BRIDGE_ISR_PCIBUS_PIOERR;
    } else {
        bridge_errors_to_dump |= BRIDGE_ISR_PCIBUS_PIOERR;
    }

    /* Dump/Log Bridge error interrupt info */
    if (err_status & bridge_errors_to_dump) {
        printk("BRIDGE ERR_STATUS 0x%lx\n", err_status);
        pcibr_error_dump(pcibr_soft);
    }

    /* PIC BRINGUP WAR (PV# 867308):
     * Make BRIDGE_ISR_LLP_REC_SNERR & BRIDGE_ISR_LLP_REC_CBERR fatal errors
     * so we know we've hit the problem defined in PV 867308 that we believe
     * has only been seen in simulation
     */
    if (PCIBR_WAR_ENABLED(PV867308, pcibr_soft) &&
        (err_status & (BRIDGE_ISR_LLP_REC_SNERR | BRIDGE_ISR_LLP_REC_CBERR))) {
        printk("BRIDGE ERR_STATUS 0x%lx\n", err_status);
        pcibr_error_dump(pcibr_soft);
        /* machine_error_dump(""); */
        panic("PCI Bridge Error interrupt killed the system");
    }

    if (err_status & BRIDGE_ISR_ERROR_FATAL) {
        panic("PCI Bridge Error interrupt killed the system");
            /*NOTREACHED */
    }


    /*
     * We can't return without re-enabling the interrupt, since
     * it would cause problems for devices like IOC3 (Lost
     * interrupts ?.). So, just cleanup the interrupt, and
     * use saved values later..
     * 
     * PIC doesn't require groups of interrupts to be cleared...
     */
    pcireg_intr_reset_set(pcibr_soft, (int_status | BRIDGE_IRR_MULTI_CLR));

    /* PIC BRINGUP WAR (PV# 856155):
     * On a PCI_X_ARB_ERR error interrupt clear the DEV_BROKE bits from
     * the b_arb register to re-enable the device.
     */
    if ((err_status & PIC_ISR_PCIX_ARB_ERR) &&
                PCIBR_WAR_ENABLED(PV856155, pcibr_soft)) {
        pcireg_arbitration_bit_set(pcibr_soft, (0xf << 20));
    }

    /* Zero out bserr_intstat field */
    pcibr_soft->bs_errinfo.bserr_intstat = 0;
    return IRQ_HANDLED;
}

/*
 * pcibr_addr_toslot
 *      Given the 'pciaddr' find out which slot this address is
 *      allocated to, and return the slot number.
 *      While we have the info handy, construct the
 *      function number, space code and offset as well.
 *
 * NOTE: if this routine is called, we don't know whether
 * the address is in CFG, MEM, or I/O space. We have to guess.
 * This will be the case on PIO stores, where the only way
 * we have of getting the address is to check the Bridge, which
 * stores the PCI address but not the space and not the xtalk
 * address (from which we could get it).
 */
static int
pcibr_addr_toslot(pcibr_soft_t pcibr_soft,
                  iopaddr_t pciaddr,
                  pciio_space_t *spacep,
                  iopaddr_t *offsetp,
                  pciio_function_t *funcp)
{
    int                     s, f = 0, w;
    iopaddr_t               base;
    size_t                  size;
    pciio_piospace_t        piosp;

    /*
     * Check if the address is in config space
     */

    if ((pciaddr >= BRIDGE_CONFIG_BASE) && (pciaddr < BRIDGE_CONFIG_END)) {

        if (pciaddr >= BRIDGE_CONFIG1_BASE)
            pciaddr -= BRIDGE_CONFIG1_BASE;
        else
            pciaddr -= BRIDGE_CONFIG_BASE;

        s = pciaddr / BRIDGE_CONFIG_SLOT_SIZE;
        pciaddr %= BRIDGE_CONFIG_SLOT_SIZE;

        if (funcp) {
            f = pciaddr / 0x100;
            pciaddr %= 0x100;
        }
        if (spacep)
            *spacep = PCIIO_SPACE_CFG;
        if (offsetp)
            *offsetp = pciaddr;
        if (funcp)
            *funcp = f;

        return s;
    }
    for (s = pcibr_soft->bs_min_slot; s < PCIBR_NUM_SLOTS(pcibr_soft); ++s) {
        int                     nf = pcibr_soft->bs_slot[s].bss_ninfo;
        pcibr_info_h            pcibr_infoh = pcibr_soft->bs_slot[s].bss_infos;

        for (f = 0; f < nf; f++) {
            pcibr_info_t            pcibr_info = pcibr_infoh[f];

            if (!pcibr_info)
                continue;
            for (w = 0; w < 6; w++) {
                if (pcibr_info->f_window[w].w_space
                    == PCIIO_SPACE_NONE) {
                    continue;
                }
                base = pcibr_info->f_window[w].w_base;
                size = pcibr_info->f_window[w].w_size;

                if ((pciaddr >= base) && (pciaddr < (base + size))) {
                    if (spacep)
                        *spacep = PCIIO_SPACE_WIN(w);
                    if (offsetp)
                        *offsetp = pciaddr - base;
                    if (funcp)
                        *funcp = f;
                    return s;
                }                       /* endif match */
            }                           /* next window */
        }                               /* next func */
    }                                   /* next slot */

    /*
     * Check if the address was allocated as part of the
     * pcibr_piospace_alloc calls.
     */
    for (s = pcibr_soft->bs_min_slot; s < PCIBR_NUM_SLOTS(pcibr_soft); ++s) {
        int                     nf = pcibr_soft->bs_slot[s].bss_ninfo;
        pcibr_info_h            pcibr_infoh = pcibr_soft->bs_slot[s].bss_infos;

        for (f = 0; f < nf; f++) {
            pcibr_info_t            pcibr_info = pcibr_infoh[f];

            if (!pcibr_info)
                continue;
            piosp = pcibr_info->f_piospace;
            while (piosp) {
                if ((piosp->start <= pciaddr) &&
                    ((piosp->count + piosp->start) > pciaddr)) {
                    if (spacep)
                        *spacep = piosp->space;
                    if (offsetp)
                        *offsetp = pciaddr - piosp->start;
                    return s;
                }                       /* endif match */
                piosp = piosp->next;
            }                           /* next piosp */
        }                               /* next func */
    }                                   /* next slot */

    /*
     * Some other random address on the PCI bus ...
     * we have no way of knowing whether this was
     * a MEM or I/O access; so, for now, we just
     * assume that the low 1G is MEM, the next
     * 3G is I/O, and anything above the 4G limit
     * is obviously MEM.
     */

    if (spacep)
        *spacep = ((pciaddr < (1ul << 30)) ? PCIIO_SPACE_MEM :
                   (pciaddr < (4ul << 30)) ? PCIIO_SPACE_IO :
                   PCIIO_SPACE_MEM);
    if (offsetp)
        *offsetp = pciaddr;

    return PCIIO_SLOT_NONE;

}

void
pcibr_error_cleanup(pcibr_soft_t pcibr_soft, int error_code)
{
    uint64_t    clr_bits = BRIDGE_IRR_ALL_CLR;

    ASSERT(error_code & IOECODE_PIO);
    error_code = error_code;

    pcireg_intr_reset_set(pcibr_soft, clr_bits);

    pcireg_tflush_get(pcibr_soft);      /* flushbus */
}


/*
 * pcibr_error_extract
 *      Given the 'pcibr vertex handle' find out which slot
 *      the bridge status error address (from pcibr_soft info
 *      hanging off the vertex)
 *      allocated to, and return the slot number.
 *      While we have the info handy, construct the
 *      space code and offset as well.
 *
 * NOTE: if this routine is called, we don't know whether
 * the address is in CFG, MEM, or I/O space. We have to guess.
 * This will be the case on PIO stores, where the only way
 * we have of getting the address is to check the Bridge, which
 * stores the PCI address but not the space and not the xtalk
 * address (from which we could get it).
 *
 * XXX- this interface has no way to return the function
 * number on a multifunction card, even though that data
 * is available.
 */

pciio_slot_t
pcibr_error_extract(vertex_hdl_t pcibr_vhdl,
                    pciio_space_t *spacep,
                    iopaddr_t *offsetp)
{
    pcibr_soft_t            pcibr_soft = 0;
    iopaddr_t               bserr_addr;
    pciio_slot_t            slot = PCIIO_SLOT_NONE;
    arbitrary_info_t        rev;

    /* Do a sanity check as to whether we really got a 
     * bridge vertex handle.
     */
    if (hwgraph_info_get_LBL(pcibr_vhdl, INFO_LBL_PCIBR_ASIC_REV, &rev) !=
        GRAPH_SUCCESS) 
        return(slot);

    pcibr_soft = pcibr_soft_get(pcibr_vhdl);
    if (pcibr_soft) {
        bserr_addr = pcireg_pci_bus_addr_get(pcibr_soft);
        slot = pcibr_addr_toslot(pcibr_soft, bserr_addr,
                                 spacep, offsetp, NULL);
    }
    return slot;
}

/*ARGSUSED */
void
pcibr_device_disable(pcibr_soft_t pcibr_soft, int devnum)
{
    /*
     * XXX
     * Device failed to handle error. Take steps to
     * disable this device ? HOW TO DO IT ?
     *
     * If there are any Read response buffers associated
     * with this device, it's time to get them back!!
     *
     * We can disassociate any interrupt level associated
     * with this device, and disable that interrupt level
     *
     * For now it's just a place holder
     */
}

/*
 * pcibr_pioerror
 *      Handle PIO error that happened at the bridge pointed by pcibr_soft.
 *
 *      Queries the Bus interface attached to see if the device driver
 *      mapping the device-number that caused error can handle the
 *      situation. If so, it will clean up any error, and return
 *      indicating the error was handled. If the device driver is unable
 *      to handle the error, it expects the bus-interface to disable that
 *      device, and takes any steps needed here to take away any resources
 *      associated with this device.
 *
 * A note about slots:
 *
 *      PIC-based bridges use zero-based device numbering when devices to
 *      internal registers.  However, the physical slots are numbered using a
 *      one-based scheme because in PCI-X, device 0 is reserved (see comments
 *      in pcibr_private.h for a better description).
 *
 *      When building up the hwgraph, we use the external (one-based) number
 *      scheme when numbering slot components so that hwgraph more accuratly
 *      reflects what is silkscreened on the bricks.
 *
 *      Since pciio_error_handler() needs to ultimatly be able to do a hwgraph
 *      lookup, the ioerror that gets built up in pcibr_pioerror() encodes the
 *      external (one-based) slot number.  However, loops in pcibr_pioerror() 
 *      which attempt to translate the virtual address into the correct
 *      PCI physical address use the device (zero-based) numbering when 
 *      walking through bridge structures.
 *
 *      To that end, pcibr_pioerror() uses device to denote the 
 *      zero-based device number, and external_slot to denote the corresponding
 *      one-based slot number.  Loop counters (eg. cs) are always device based.
 */

/* BEM_ADD_IOE doesn't dump the whole ioerror, it just
 * decodes the PCI specific portions -- we count on our
 * callers to dump the raw IOE data.
 */
#define BEM_ADD_IOE(ioe)                                                \
        do {                                                            \
            if (IOERROR_FIELDVALID(ioe, busspace)) {                    \
                iopaddr_t               spc;                            \
                iopaddr_t               win;                            \
                short                   widdev;                         \
                iopaddr_t               busaddr;                        \
                                                                        \
                IOERROR_GETVALUE(spc, ioe, busspace);                   \
                win = spc - PCIIO_SPACE_WIN(0);                         \
                IOERROR_GETVALUE(busaddr, ioe, busaddr);                \
                IOERROR_GETVALUE(widdev, ioe, widgetdev);               \
                                                                        \
                switch (spc) {                                          \
                case PCIIO_SPACE_CFG:                                   \
                    printk("\tPCI Slot %d Func %d CFG space Offset 0x%lx\n",\
                                pciio_widgetdev_slot_get(widdev),       \
                                pciio_widgetdev_func_get(widdev),       \
                                busaddr);                               \
                    break;                                              \
                case PCIIO_SPACE_IO:                                    \
                    printk("\tPCI I/O space  Offset 0x%lx\n", busaddr); \
                    break;                                              \
                case PCIIO_SPACE_MEM:                                   \
                case PCIIO_SPACE_MEM32:                                 \
                case PCIIO_SPACE_MEM64:                                 \
                    printk("\tPCI MEM space Offset 0x%lx\n", busaddr);  \
                    break;                                              \
                default:                                                \
                    if (win < 6) {                                      \
                    printk("\tPCI Slot %d Func %d Window %ld Offset 0x%lx\n",\
                                pciio_widgetdev_slot_get(widdev),       \
                                pciio_widgetdev_func_get(widdev),       \
                                win,                                    \
                                busaddr);                               \
                    }                                                   \
                    break;                                              \
                }                                                       \
            }                                                           \
        } while (0)

/*ARGSUSED */
int
pcibr_pioerror(
                  pcibr_soft_t pcibr_soft,
                  int error_code,
                  ioerror_mode_t mode,
                  ioerror_t *ioe)
{
    int                     retval = IOERROR_HANDLED;

    vertex_hdl_t            pcibr_vhdl = pcibr_soft->bs_vhdl;
    iopaddr_t               bad_xaddr;

    pciio_space_t           raw_space;  /* raw PCI space */
    iopaddr_t               raw_paddr;  /* raw PCI address */

    pciio_space_t           space;      /* final PCI space */
    pciio_slot_t            device;     /* final PCI device if appropriate */
    pciio_slot_t            external_slot;/* external slot for device */
    pciio_function_t        func;       /* final PCI func, if appropriate */
    iopaddr_t               offset;     /* final PCI offset */
    
    int                     cs, cw, cf;
    pciio_space_t           wx;
    iopaddr_t               wb;
    size_t                  ws;
    iopaddr_t               wl;


    /*
     * We expect to have an "xtalkaddr" coming in,
     * and need to construct the slot/space/offset.
     */

    IOERROR_GETVALUE(bad_xaddr, ioe, xtalkaddr);

    PCIBR_DEBUG_ALWAYS((PCIBR_DEBUG_ERROR_HDLR, pcibr_soft->bs_conn,
                "pcibr_pioerror: pcibr_soft=0x%lx, bad_xaddr=0x%lx\n",
                pcibr_soft, bad_xaddr));

    device = PCIIO_SLOT_NONE;
    func = PCIIO_FUNC_NONE;
    raw_space = PCIIO_SPACE_NONE;
    raw_paddr = 0;

    if ((bad_xaddr >= PCIBR_BUS_TYPE0_CFG_DEV(pcibr_soft, 0)) &&
        (bad_xaddr < PCIBR_TYPE1_CFG(pcibr_soft))) {
        raw_paddr = bad_xaddr - PCIBR_BUS_TYPE0_CFG_DEV(pcibr_soft, 0);
        device = raw_paddr / BRIDGE_CONFIG_SLOT_SIZE;
        raw_paddr = raw_paddr % BRIDGE_CONFIG_SLOT_SIZE;
        raw_space = PCIIO_SPACE_CFG;
    }
    if ((bad_xaddr >= PCIBR_TYPE1_CFG(pcibr_soft)) &&
        (bad_xaddr < (PCIBR_TYPE1_CFG(pcibr_soft) + 0x1000))) {
        /* Type 1 config space:
         * slot and function numbers not known.
         * Perhaps we can read them back?
         */
        raw_paddr = bad_xaddr - PCIBR_TYPE1_CFG(pcibr_soft);
        raw_space = PCIIO_SPACE_CFG;
    }
    if ((bad_xaddr >= PCIBR_BRIDGE_DEVIO(pcibr_soft, 0)) &&
        (bad_xaddr < PCIBR_BRIDGE_DEVIO(pcibr_soft, BRIDGE_DEV_CNT))) {
        int                     x;

        raw_paddr = bad_xaddr - PCIBR_BRIDGE_DEVIO(pcibr_soft, 0);
        x = raw_paddr / BRIDGE_DEVIO_OFF;
        raw_paddr %= BRIDGE_DEVIO_OFF;
        /* first two devio windows are double-sized */
        if ((x == 1) || (x == 3))
            raw_paddr += BRIDGE_DEVIO_OFF;
        if (x > 0)
            x--;
        if (x > 1)
            x--;
        /* x is which devio reg; no guarantee
         * PCI slot x will be responding.
         * still need to figure out who decodes
         * space/offset on the bus.
         */
        raw_space = pcibr_soft->bs_slot[x].bss_devio.bssd_space;
        if (raw_space == PCIIO_SPACE_NONE) {
            /* Someone got an error because they
             * accessed the PCI bus via a DevIO(x)
             * window that pcibr has not yet assigned
             * to any specific PCI address. It is
             * quite possible that the Device(x)
             * register has been changed since they
             * made their access, but we will give it
             * our best decode shot.
             */
            raw_space = pcibr_soft->bs_slot[x].bss_device
                & BRIDGE_DEV_DEV_IO_MEM
                ? PCIIO_SPACE_MEM
                : PCIIO_SPACE_IO;
            raw_paddr +=
                (pcibr_soft->bs_slot[x].bss_device &
                 BRIDGE_DEV_OFF_MASK) <<
                BRIDGE_DEV_OFF_ADDR_SHFT;
        } else
            raw_paddr += pcibr_soft->bs_slot[x].bss_devio.bssd_base;
    }

    if (IS_PIC_BUSNUM_SOFT(pcibr_soft, 0)) {
        if ((bad_xaddr >= PICBRIDGE0_PCI_MEM32_BASE) &&
            (bad_xaddr <= PICBRIDGE0_PCI_MEM32_LIMIT)) {
            raw_space = PCIIO_SPACE_MEM32;
            raw_paddr = bad_xaddr - PICBRIDGE0_PCI_MEM32_BASE;
        }
        if ((bad_xaddr >= PICBRIDGE0_PCI_MEM64_BASE) &&
            (bad_xaddr <= PICBRIDGE0_PCI_MEM64_LIMIT)) {
            raw_space = PCIIO_SPACE_MEM64;
            raw_paddr = bad_xaddr - PICBRIDGE0_PCI_MEM64_BASE;
        }
    } else if (IS_PIC_BUSNUM_SOFT(pcibr_soft, 1)) {
        if ((bad_xaddr >= PICBRIDGE1_PCI_MEM32_BASE) &&
            (bad_xaddr <= PICBRIDGE1_PCI_MEM32_LIMIT)) {
            raw_space = PCIIO_SPACE_MEM32;
            raw_paddr = bad_xaddr - PICBRIDGE1_PCI_MEM32_BASE;
        }
        if ((bad_xaddr >= PICBRIDGE1_PCI_MEM64_BASE) &&
            (bad_xaddr <= PICBRIDGE1_PCI_MEM64_LIMIT)) {
            raw_space = PCIIO_SPACE_MEM64;
            raw_paddr = bad_xaddr - PICBRIDGE1_PCI_MEM64_BASE;
        }
    } else {
        printk("pcibr_pioerror(): unknown bridge type");
        return IOERROR_UNHANDLED;
    }
    space = raw_space;
    offset = raw_paddr;

    if ((device == PCIIO_SLOT_NONE) && (space != PCIIO_SPACE_NONE)) {
        /* we've got a space/offset but not which
         * PCI slot decodes it. Check through our
         * notions of which devices decode where.
         *
         * Yes, this "duplicates" some logic in
         * pcibr_addr_toslot; the difference is,
         * this code knows which space we are in,
         * and can really really tell what is
         * going on (no guessing).
         */

        for (cs = pcibr_soft->bs_min_slot; 
                (cs < PCIBR_NUM_SLOTS(pcibr_soft)) && 
                                (device == PCIIO_SLOT_NONE); cs++) {
            int                     nf = pcibr_soft->bs_slot[cs].bss_ninfo;
            pcibr_info_h            pcibr_infoh = pcibr_soft->bs_slot[cs].bss_infos;

            for (cf = 0; (cf < nf) && (device == PCIIO_SLOT_NONE); cf++) {
                pcibr_info_t            pcibr_info = pcibr_infoh[cf];

                if (!pcibr_info)
                    continue;
                for (cw = 0; (cw < 6) && (device == PCIIO_SLOT_NONE); ++cw) {
                    if (((wx = pcibr_info->f_window[cw].w_space) != PCIIO_SPACE_NONE) &&
                        ((wb = pcibr_info->f_window[cw].w_base) != 0) &&
                        ((ws = pcibr_info->f_window[cw].w_size) != 0) &&
                        ((wl = wb + ws) > wb) &&
                        ((wb <= offset) && (wl > offset))) {
                        /* MEM, MEM32 and MEM64 need to
                         * compare as equal ...
                         */
                        if ((wx == space) ||
                            (((wx == PCIIO_SPACE_MEM) ||
                              (wx == PCIIO_SPACE_MEM32) ||
                              (wx == PCIIO_SPACE_MEM64)) &&
                             ((space == PCIIO_SPACE_MEM) ||
                              (space == PCIIO_SPACE_MEM32) ||
                              (space == PCIIO_SPACE_MEM64)))) {
                            device = cs;
                            func = cf;
                            space = PCIIO_SPACE_WIN(cw);
                            offset -= wb;
                        }               /* endif window space match */
                    }                   /* endif window valid and addr match */
                }                       /* next window unless slot set */
            }                           /* next func unless slot set */
        }                               /* next slot unless slot set */
        /* XXX- if slot is still -1, no PCI devices are
         * decoding here using their standard PCI BASE
         * registers. This would be a really good place
         * to cross-coordinate with the pciio PCI
         * address space allocation routines, to find
         * out if this address is "allocated" by any of
         * our subsidiary devices.
         */
    }
    /* Scan all piomap records on this PCI bus to update
     * the TimeOut Counters on all matching maps. If we
     * don't already know the slot number, take it from
     * the first matching piomap. Note that we have to
     * compare maps against raw_space and raw_paddr
     * since space and offset could already be
     * window-relative.
     *
     * There is a chance that one CPU could update
     * through this path, and another CPU could also
     * update due to an interrupt. Closing this hole
     * would only result in the possibility of some
     * errors never getting logged at all, and since the
     * use for bp_toc is as a logical test rather than a
     * strict count, the excess counts are not a
     * problem.
     */
    for (cs = pcibr_soft->bs_min_slot; 
                                cs < PCIBR_NUM_SLOTS(pcibr_soft); ++cs) {
        int             nf = pcibr_soft->bs_slot[cs].bss_ninfo;
        pcibr_info_h    pcibr_infoh = pcibr_soft->bs_slot[cs].bss_infos;

        for (cf = 0; cf < nf; cf++) {
            pcibr_info_t        pcibr_info = pcibr_infoh[cf];
            pcibr_piomap_t      map;    

            if (!pcibr_info)
                continue;

            for (map = pcibr_info->f_piomap;
             map != NULL; map = map->bp_next) {
            wx = map->bp_space;
            wb = map->bp_pciaddr;
            ws = map->bp_mapsz;
            cw = wx - PCIIO_SPACE_WIN(0);
            if (cw >= 0 && cw < 6) {
                wb += pcibr_soft->bs_slot[cs].bss_window[cw].bssw_base;
                wx = pcibr_soft->bs_slot[cs].bss_window[cw].bssw_space;
            }
            if (wx == PCIIO_SPACE_ROM) {
                wb += pcibr_info->f_rbase;
                wx = PCIIO_SPACE_MEM;
            }
            if ((wx == PCIIO_SPACE_MEM32) ||
                (wx == PCIIO_SPACE_MEM64))
                wx = PCIIO_SPACE_MEM;
            wl = wb + ws;
            if ((wx == raw_space) && (raw_paddr >= wb) && (raw_paddr < wl)) {
                atomic_inc(&map->bp_toc);
                if (device == PCIIO_SLOT_NONE) {
                    device = cs;
                    func = cf;
                    space = map->bp_space;
                    if (cw >= 0 && cw < 6)
                        offset -= pcibr_soft->bs_slot[device].bss_window[cw].bssw_base;
                }

                break;
            }
            }
        }
    }

    PCIBR_DEBUG_ALWAYS((PCIBR_DEBUG_ERROR_HDLR, pcibr_soft->bs_conn,
                "pcibr_pioerror: space=%d, offset=0x%lx, dev=0x%x, func=0x%x\n",
                space, offset, device, func));

    if (space != PCIIO_SPACE_NONE) {
        if (device != PCIIO_SLOT_NONE)  {
            external_slot = PCIBR_DEVICE_TO_SLOT(pcibr_soft, device);

            if (func != PCIIO_FUNC_NONE)
                IOERROR_SETVALUE(ioe, widgetdev, 
                                 pciio_widgetdev_create(external_slot,func));
            else
                IOERROR_SETVALUE(ioe, widgetdev, 
                                 pciio_widgetdev_create(external_slot,0));
        }
        IOERROR_SETVALUE(ioe, busspace, space);
        IOERROR_SETVALUE(ioe, busaddr, offset);
    }
    if (mode == MODE_DEVPROBE) {
        /*
         * During probing, we don't really care what the
         * error is. Clean up the error in Bridge, notify
         * subsidiary devices, and return success.
         */
        pcibr_error_cleanup(pcibr_soft, error_code);

        /* if appropriate, give the error handler for this slot
         * a shot at this probe access as well.
         */
        return (device == PCIIO_SLOT_NONE) ? IOERROR_HANDLED :
            pciio_error_handler(pcibr_vhdl, error_code, mode, ioe);
    }
    /*
     * If we don't know what "PCI SPACE" the access
     * was targeting, we may have problems at the
     * Bridge itself. Don't touch any bridge registers,
     * and do complain loudly.
     */

    if (space == PCIIO_SPACE_NONE) {
        printk("XIO Bus Error at %s\n"
                "\taccess to XIO bus offset 0x%lx\n"
                "\tdoes not correspond to any PCI address\n",
                pcibr_soft->bs_name, bad_xaddr);

        /* caller will dump contents of ioe struct */
        return IOERROR_XTALKLEVEL;
    }

    /*
     * Actual PCI Error handling situation.
     * Typically happens when a user level process accesses
     * PCI space, and it causes some error.
     *
     * Due to PCI Bridge implementation, we get two indication
     * for a read error: an interrupt and a Bus error.
     * We like to handle read error in the bus error context.
     * But the interrupt comes and goes before bus error
     * could make much progress. (NOTE: interrupd does
     * come in _after_ bus error processing starts. But it's
     * completed by the time bus error code reaches PCI PIO
     * error handling.
     * Similarly write error results in just an interrupt,
     * and error handling has to be done at interrupt level.
     * There is no way to distinguish at interrupt time, if an
     * error interrupt is due to read/write error..
     */

    /* We know the xtalk addr, the raw PCI bus space,
     * the raw PCI bus address, the decoded PCI bus
     * space, the offset within that space, and the
     * decoded PCI slot (which may be "PCIIO_SLOT_NONE" if no slot
     * is known to be involved).
     */

    /*
     * Hand the error off to the handler registered
     * for the slot that should have decoded the error,
     * or to generic PCI handling (if pciio decides that
     * such is appropriate).
     */
    retval = pciio_error_handler(pcibr_vhdl, error_code, mode, ioe);

    if (retval != IOERROR_HANDLED) {

        /* Generate a generic message for IOERROR_UNHANDLED
         * since the subsidiary handlers were silent, and
         * did no recovery.
         */
        if (retval == IOERROR_UNHANDLED) {
            retval = IOERROR_PANIC;

            /* we may or may not want to print some of this,
             * depending on debug level and which error code.
             */

            printk(KERN_ALERT
                    "PIO Error on PCI Bus %s",
                    pcibr_soft->bs_name);
            BEM_ADD_IOE(ioe);
        }

        /*
         * Since error could not be handled at lower level,
         * error data logged has not  been cleared.
         * Clean up errors, and
         * re-enable bridge to interrupt on error conditions.
         * NOTE: Wheather we get the interrupt on PCI_ABORT or not is
         * dependent on INT_ENABLE register. This write just makes sure
         * that if the interrupt was enabled, we do get the interrupt.
         *
         * CAUTION: Resetting bit BRIDGE_IRR_PCI_GRP_CLR, acknowledges
         *      a group of interrupts. If while handling this error,
         *      some other error has occurred, that would be
         *      implicitly cleared by this write.
         *      Need a way to ensure we don't inadvertently clear some
         *      other errors.
         */
        if (IOERROR_FIELDVALID(ioe, widgetdev)) {
            short widdev;
            IOERROR_GETVALUE(widdev, ioe, widgetdev);
            external_slot = pciio_widgetdev_slot_get(widdev);
            device = PCIBR_SLOT_TO_DEVICE(pcibr_soft, external_slot);
            pcibr_device_disable(pcibr_soft, device);
        }
        if (mode == MODE_DEVUSERERROR)
            pcibr_error_cleanup(pcibr_soft, error_code);
    }
    return retval;
}

/*
 * bridge_dmaerror
 *      Some error was identified in a DMA transaction.
 *      This routine will identify the <device, address> that caused the error,
 *      and try to invoke the appropriate bus service to handle this.
 */

int
pcibr_dmard_error(
                     pcibr_soft_t pcibr_soft,
                     int error_code,
                     ioerror_mode_t mode,
                     ioerror_t *ioe)
{
    vertex_hdl_t            pcibr_vhdl = pcibr_soft->bs_vhdl;
    int                     retval = 0;
    int                     bufnum, device;

    /*
     * In case of DMA errors, bridge should have logged the
     * address that caused the error.
     * Look up the address, in the bridge error registers, and
     * take appropriate action
     */
    {
        short tmp;
        IOERROR_GETVALUE(tmp, ioe, widgetnum);
        ASSERT(tmp == pcibr_soft->bs_xid);
    }

    /*
     * read error log registers
     */
    bufnum = pcireg_resp_err_buf_get(pcibr_soft);
    device = pcireg_resp_err_dev_get(pcibr_soft);
    IOERROR_SETVALUE(ioe, widgetdev, pciio_widgetdev_create(device, 0));
    IOERROR_SETVALUE(ioe, busaddr, pcireg_resp_err_get(pcibr_soft));

    /*
     * need to ensure that the xtalk address in ioe
     * maps to PCI error address read from bridge.
     * How to convert PCI address back to Xtalk address ?
     * (better idea: convert XTalk address to PCI address
     * and then do the compare!)
     */

    retval = pciio_error_handler(pcibr_vhdl, error_code, mode, ioe);
    if (retval != IOERROR_HANDLED) {
        short tmp;
        IOERROR_GETVALUE(tmp, ioe, widgetdev);
        pcibr_device_disable(pcibr_soft, pciio_widgetdev_slot_get(tmp));
    }

    /*
     * Re-enable bridge to interrupt on BRIDGE_IRR_RESP_BUF_GRP_CLR
     * NOTE: Wheather we get the interrupt on BRIDGE_IRR_RESP_BUF_GRP_CLR or
     * not is dependent on INT_ENABLE register. This write just makes sure
     * that if the interrupt was enabled, we do get the interrupt.
     */
    pcireg_intr_reset_set(pcibr_soft, BRIDGE_IRR_RESP_BUF_GRP_CLR);

    /*
     * Also, release the "bufnum" back to buffer pool that could be re-used.
     * This is done by "disabling" the buffer for a moment, then restoring
     * the original assignment.
     */

    {
        uint64_t                rrb_reg;
        uint64_t                mask;

        rrb_reg = pcireg_rrb_get(pcibr_soft, (bufnum & 1));
        mask = 0xF << ((bufnum >> 1) * 4);
        pcireg_rrb_set(pcibr_soft, (bufnum & 1), (rrb_reg & ~mask));
        pcireg_rrb_set(pcibr_soft, (bufnum & 1), rrb_reg);
    }

    return retval;
}

/*
 * pcibr_dmawr_error:
 *      Handle a dma write error caused by a device attached to this bridge.
 *
 *      ioe has the widgetnum, widgetdev, and memaddr fields updated
 *      But we don't know the PCI address that corresponds to "memaddr"
 *      nor do we know which device driver is generating this address.
 *
 *      There is no easy way to find out the PCI address(es) that map
 *      to a specific system memory address. Bus handling code is also
 *      of not much help, since they don't keep track of the DMA mapping
 *      that have been handed out.
 *      So it's a dead-end at this time.
 *
 *      If translation is available, we could invoke the error handling
 *      interface of the device driver.
 */
/*ARGSUSED */
int
pcibr_dmawr_error(
                     pcibr_soft_t pcibr_soft,
                     int error_code,
                     ioerror_mode_t mode,
                     ioerror_t *ioe)
{
    vertex_hdl_t            pcibr_vhdl = pcibr_soft->bs_vhdl;
    int                     retval;

    retval = pciio_error_handler(pcibr_vhdl, error_code, mode, ioe);

    if (retval != IOERROR_HANDLED) {
        short tmp;

        IOERROR_GETVALUE(tmp, ioe, widgetdev);
        pcibr_device_disable(pcibr_soft, pciio_widgetdev_slot_get(tmp));
    }
    return retval;
}

/*
 * Bridge error handler.
 *      Interface to handle all errors that involve bridge in some way.
 *
 *      This normally gets called from xtalk error handler.
 *      ioe has different set of fields set depending on the error that
 *      was encountered. So, we have a bit field indicating which of the
 *      fields are valid.
 *
 * NOTE: This routine could be operating in interrupt context. So,
 *      don't try to sleep here (till interrupt threads work!!)
 */
int
pcibr_error_handler(
                       error_handler_arg_t einfo,
                       int error_code,
                       ioerror_mode_t mode,
                       ioerror_t *ioe)
{
    pcibr_soft_t            pcibr_soft;
    int                     retval = IOERROR_BADERRORCODE;

    pcibr_soft = (pcibr_soft_t) einfo;

    PCIBR_DEBUG_ALWAYS((PCIBR_DEBUG_ERROR_HDLR, pcibr_soft->bs_conn,
                "pcibr_error_handler: pcibr_soft=0x%lx, error_code=0x%x\n",
                pcibr_soft, error_code));

#if DEBUG && ERROR_DEBUG
    printk( "%s: pcibr_error_handler\n", pcibr_soft->bs_name);
#endif

    ASSERT(pcibr_soft != NULL);

    if (error_code & IOECODE_PIO)
        retval = pcibr_pioerror(pcibr_soft, error_code, mode, ioe);

    if (error_code & IOECODE_DMA) {
        if (error_code & IOECODE_READ) {
            /*
             * DMA read error occurs when a device attached to the bridge
             * tries to read some data from system memory, and this
             * either results in a timeout or access error.
             * First case is indicated by the bit "XREAD_REQ_TOUT"
             * and second case by "RESP_XTALK_ERROR" bit in bridge error
             * interrupt status register.
             *
             * pcibr_error_intr_handler would get invoked first, and it has
             * the responsibility of calling pcibr_error_handler with
             * suitable parameters.
             */

            retval = pcibr_dmard_error(pcibr_soft, error_code, MODE_DEVERROR, ioe);
        }
        if (error_code & IOECODE_WRITE) {
            /*
             * A device attached to this bridge has been generating
             * bad DMA writes. Find out the device attached, and
             * slap on it's wrist.
             */

            retval = pcibr_dmawr_error(pcibr_soft, error_code, MODE_DEVERROR, ioe);
        }
    }
    return retval;

}

/*
 * PIC has 2 busses under a single widget so pcibr_attach2 registers this
 * wrapper function rather than pcibr_error_handler() for PIC.  It's upto
 * this wrapper to call pcibr_error_handler() with the correct pcibr_soft
 * struct (ie. the pcibr_soft struct for the bus that saw the error).
 *
 * NOTE: this wrapper function is only registered for PIC ASICs and will
 * only be called for a PIC
 */
int
pcibr_error_handler_wrapper(
                       error_handler_arg_t einfo,
                       int error_code,
                       ioerror_mode_t mode,
                       ioerror_t *ioe)
{
    pcibr_soft_t       pcibr_soft = (pcibr_soft_t) einfo;
    int                pio_retval = -1; 
    int                dma_retval = -1;

    PCIBR_DEBUG_ALWAYS((PCIBR_DEBUG_ERROR_HDLR, pcibr_soft->bs_conn,
                "pcibr_error_handler_wrapper: pcibr_soft=0x%lx, "
                "error_code=0x%x\n", pcibr_soft, error_code));

    /*
     * It is possible that both a IOECODE_PIO and a IOECODE_DMA, and both
     * IOECODE_READ and IOECODE_WRITE could be set in error_code so we must
     * process all.  Since we are a wrapper for pcibr_error_handler(), and
     * will be calling it several times within this routine, we turn off the
     * error_code bits we don't want it to be processing during that call.
     */
    /* 
     * If the error was a result of a PIO, we tell what bus on the PIC saw
     * the error from the PIO address.
     */

    if (error_code & IOECODE_PIO) {
        iopaddr_t               bad_xaddr;
        /*
         * PIC bus0 PIO space 0x000000 - 0x7fffff or 0x40000000 - 0xbfffffff
         *     bus1 PIO space 0x800000 - 0xffffff or 0xc0000000 - 0x13fffffff
         */
        IOERROR_GETVALUE(bad_xaddr, ioe, xtalkaddr);
        if ((bad_xaddr <= 0x7fffff) ||
            ((bad_xaddr >= 0x40000000) && (bad_xaddr <= 0xbfffffff))) {
            /* bus 0 saw the error */
            pio_retval = pcibr_error_handler((error_handler_arg_t)pcibr_soft,
                         (error_code & ~IOECODE_DMA), mode, ioe);
        } else if (((bad_xaddr >= 0x800000) && (bad_xaddr <= 0xffffff)) ||
            ((bad_xaddr >= 0xc0000000) && (bad_xaddr <= 0x13fffffff))) {
            /* bus 1 saw the error */
            pcibr_soft = pcibr_soft->bs_peers_soft;
            if (!pcibr_soft) {
#if DEBUG
                printk(KERN_WARNING "pcibr_error_handler: "
                        "bs_peers_soft==NULL. bad_xaddr= 0x%lx mode= 0x%lx\n",
                                                bad_xaddr, mode);
#endif
                pio_retval = IOERROR_HANDLED;
            } else
                pio_retval= pcibr_error_handler((error_handler_arg_t)pcibr_soft,
                         (error_code & ~IOECODE_DMA), mode, ioe);
        } else {
            printk(KERN_WARNING "pcibr_error_handler_wrapper(): IOECODE_PIO: "
                    "saw an invalid pio address: 0x%lx\n", bad_xaddr);
            pio_retval = IOERROR_UNHANDLED;
        }
    } 

    /* 
     * If the error was a result of a DMA Write, we tell what bus on the PIC
     * saw the error by looking at tnum.
     */
    if ((error_code & IOECODE_DMA) && (error_code & IOECODE_WRITE)) {
        short tmp;
        /*
         * For DMA writes [X]Bridge encodes the TNUM field of a Xtalk
         * packet like this:
         *              bits  value
         *              4:3   10b
         *              2:0   device number
         *
         * BUT PIC needs the bus number so it does this:
         *              bits  value
         *              4:3   10b
         *              2     busnumber
         *              1:0   device number
         *
         * Pull out the bus number from `tnum' and reset the `widgetdev'
         * since when hubiio_crb_error_handler() set `widgetdev' it had
         * no idea if it was a PIC or a BRIDGE ASIC so it set it based
         * off bits 2:0
         */
        IOERROR_GETVALUE(tmp, ioe, tnum);
        IOERROR_SETVALUE(ioe, widgetdev, (tmp & 0x3));
        if ((tmp & 0x4) == 0) {
            /* bus 0 saw the error. */
            dma_retval = pcibr_error_handler((error_handler_arg_t)pcibr_soft,
                         (error_code & ~(IOECODE_PIO|IOECODE_READ)), mode, ioe);
        } else {
            /* bus 1 saw the error */
            pcibr_soft = pcibr_soft->bs_peers_soft;
            dma_retval = pcibr_error_handler((error_handler_arg_t)pcibr_soft,
                         (error_code & ~(IOECODE_PIO|IOECODE_READ)), mode, ioe);
        }
    } 
    
    /* 
     * If the error was a result of a DMA READ, XXX ???
     */
    if ((error_code & IOECODE_DMA) && (error_code & IOECODE_READ)) {
        /*
         * A DMA Read error will result in a BRIDGE_ISR_RESP_XTLK_ERR
         * or BRIDGE_ISR_BAD_XRESP_PKT bridge error interrupt which 
         * are fatal interrupts (ie. BRIDGE_ISR_ERROR_FATAL) causing
         * pcibr_error_intr_handler() to panic the system.  So is the
         * error handler even going to get called???  It appears that
         * the pcibr_dmard_error() attempts to clear the interrupts
         * so pcibr_error_intr_handler() won't see them, but there
         * appears to be nothing to prevent pcibr_error_intr_handler()
         * from running before pcibr_dmard_error() has a chance to
         * clear the interrupt.
         *
         * Since we'll be panicing anyways, don't bother handling the
         * error for now until we can fix this race condition mentioned
         * above.
         */
        dma_retval = IOERROR_UNHANDLED;
    } 
    
    /* XXX: pcibr_error_handler() should probably do the same thing, it over-
     * write it's return value as it processes the different "error_code"s.
     */
    if ((pio_retval == -1) && (dma_retval == -1)) {
        return IOERROR_BADERRORCODE;
    } else if ((dma_retval != IOERROR_HANDLED) && (dma_retval != -1)) {
        return dma_retval;
    } else if ((pio_retval != IOERROR_HANDLED) && (pio_retval != -1)) {
        return pio_retval;
    } else {
        return IOERROR_HANDLED;
    }
}