ip27-berr.c

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/*
 * 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) 1994, 1995, 1996, 1999, 2000 by Ralf Baechle
 * Copyright (C) 1999, 2000 by Silicon Graphics
 * Copyright (C) 2002  Maciej W. Rozycki
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/signal.h>   /* for SIGBUS */
#include <linux/sched.h>    /* schow_regs(), force_sig() */

#include <asm/module.h>
#include <asm/sn/addrs.h>
#include <asm/sn/arch.h>
#include <asm/sn/sn0/hub.h>
#include <asm/tlbdebug.h>
#include <asm/traps.h>
#include <asm/uaccess.h>

static void dump_hub_information(unsigned long errst0, unsigned long errst1)
{
    static char *err_type[2][8] = {
        { NULL, "Uncached Partial Read PRERR", "DERR", "Read Timeout",
          NULL, NULL, NULL, NULL },
        { "WERR", "Uncached Partial Write", "PWERR", "Write Timeout",
          NULL, NULL, NULL, NULL }
    };
    int wrb = errst1 & PI_ERR_ST1_WRBRRB_MASK;

    if (!(errst0 & PI_ERR_ST0_VALID_MASK)) {
        printk("Hub does not contain valid error information\n");
        return;
    }


    printk("Hub has valid error information:\n");
    if (errst0 & PI_ERR_ST0_OVERRUN_MASK)
        printk("Overrun is set.  Error stack may contain additional "
               "information.\n");
    printk("Hub error address is %08lx\n",
           (errst0 & PI_ERR_ST0_ADDR_MASK) >> (PI_ERR_ST0_ADDR_SHFT - 3));
    printk("Incoming message command 0x%lx\n",
           (errst0 & PI_ERR_ST0_CMD_MASK) >> PI_ERR_ST0_CMD_SHFT);
    printk("Supplemental field of incoming message is 0x%lx\n",
           (errst0 & PI_ERR_ST0_SUPPL_MASK) >> PI_ERR_ST0_SUPPL_SHFT);
    printk("T5 Rn (for RRB only) is 0x%lx\n",
           (errst0 & PI_ERR_ST0_REQNUM_MASK) >> PI_ERR_ST0_REQNUM_SHFT);
    printk("Error type is %s\n", err_type[wrb]
           [(errst0 & PI_ERR_ST0_TYPE_MASK) >> PI_ERR_ST0_TYPE_SHFT]
        ? : "invalid");
}

int ip27_be_handler(struct pt_regs *regs, int is_fixup)
{
    unsigned long errst0, errst1;
    int data = regs->cp0_cause & 4;
    int cpu = LOCAL_HUB_L(PI_CPU_NUM);

    if (is_fixup)
        return MIPS_BE_FIXUP;

    printk("Slice %c got %cbe at 0x%lx\n", 'A' + cpu, data ? 'd' : 'i',
           regs->cp0_epc);
    printk("Hub information:\n");
    printk("ERR_INT_PEND = 0x%06llx\n", LOCAL_HUB_L(PI_ERR_INT_PEND));
    errst0 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS0_B : PI_ERR_STATUS0_A);
    errst1 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS1_B : PI_ERR_STATUS1_A);
    dump_hub_information(errst0, errst1);
    show_regs(regs);
    dump_tlb_all();
    while(1);
    force_sig(SIGBUS, current);
}

void __init ip27_be_init(void)
{
    /* XXX Initialize all the Hub & Bridge error handling here.  */
    int cpu = LOCAL_HUB_L(PI_CPU_NUM);
    int cpuoff = cpu << 8;

    board_be_handler = ip27_be_handler;

    LOCAL_HUB_S(PI_ERR_INT_PEND,
                cpu ? PI_ERR_CLEAR_ALL_B : PI_ERR_CLEAR_ALL_A);
    LOCAL_HUB_S(PI_ERR_INT_MASK_A + cpuoff, 0);
    LOCAL_HUB_S(PI_ERR_STACK_ADDR_A + cpuoff, 0);
    LOCAL_HUB_S(PI_ERR_STACK_SIZE, 0);  /* Disable error stack */
    LOCAL_HUB_S(PI_SYSAD_ERRCHK_EN, PI_SYSAD_CHECK_ALL);
}