LXR linux/arch/mips/sgi-ip27/ip27-berr.c

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 1994, 1995, 1996, 1999, 2000 by Ralf Baechle
   7 * Copyright (C) 1999, 2000 by Silicon Graphics
   8 * Copyright (C) 2002  Maciej W. Rozycki
   9 */
  10#include <linux/init.h>
  11#include <linux/kernel.h>
  12#include <linux/signal.h>       /* for SIGBUS */
  13#include <linux/sched.h>        /* schow_regs(), force_sig() */
  14#include <linux/sched/debug.h>
  15#include <linux/sched/signal.h>
  16
  17#include <asm/ptrace.h>
  18#include <asm/sn/addrs.h>
  19#include <asm/sn/agent.h>
  20#include <asm/sn/arch.h>
  21#include <asm/tlbdebug.h>
  22#include <asm/traps.h>
  23#include <linux/uaccess.h>
  24
  25static void dump_hub_information(unsigned long errst0, unsigned long errst1)
  26{
  27        static char *err_type[2][8] = {
  28                { NULL, "Uncached Partial Read PRERR", "DERR", "Read Timeout",
  29                  NULL, NULL, NULL, NULL },
  30                { "WERR", "Uncached Partial Write", "PWERR", "Write Timeout",
  31                  NULL, NULL, NULL, NULL }
  32        };
  33        union pi_err_stat0 st0;
  34        union pi_err_stat1 st1;
  35
  36        st0.pi_stat0_word = errst0;
  37        st1.pi_stat1_word = errst1;
  38
  39        if (!st0.pi_stat0_fmt.s0_valid) {
  40                pr_info("Hub does not contain valid error information\n");
  41                return;
  42        }
  43
  44        pr_info("Hub has valid error information:\n");
  45        if (st0.pi_stat0_fmt.s0_ovr_run)
  46                pr_info("Overrun is set. Error stack may contain additional "
  47                       "information.\n");
  48        pr_info("Hub error address is %08lx\n",
  49                (unsigned long)st0.pi_stat0_fmt.s0_addr);
  50        pr_info("Incoming message command 0x%lx\n",
  51                (unsigned long)st0.pi_stat0_fmt.s0_cmd);
  52        pr_info("Supplemental field of incoming message is 0x%lx\n",
  53                (unsigned long)st0.pi_stat0_fmt.s0_supl);
  54        pr_info("T5 Rn (for RRB only) is 0x%lx\n",
  55                (unsigned long)st0.pi_stat0_fmt.s0_t5_req);
  56        pr_info("Error type is %s\n", err_type[st1.pi_stat1_fmt.s1_rw_rb]
  57               [st0.pi_stat0_fmt.s0_err_type] ? : "invalid");
  58}
  59
  60int ip27_be_handler(struct pt_regs *regs, int is_fixup)
  61{
  62        unsigned long errst0, errst1;
  63        int data = regs->cp0_cause & 4;
  64        int cpu = LOCAL_HUB_L(PI_CPU_NUM);
  65
  66        if (is_fixup)
  67                return MIPS_BE_FIXUP;
  68
  69        printk("Slice %c got %cbe at 0x%lx\n", 'A' + cpu, data ? 'd' : 'i',
  70               regs->cp0_epc);
  71        printk("Hub information:\n");
  72        printk("ERR_INT_PEND = 0x%06llx\n", LOCAL_HUB_L(PI_ERR_INT_PEND));
  73        errst0 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS0_B : PI_ERR_STATUS0_A);
  74        errst1 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS1_B : PI_ERR_STATUS1_A);
  75        dump_hub_information(errst0, errst1);
  76        show_regs(regs);
  77        dump_tlb_all();
  78        while(1);
  79        force_sig(SIGBUS);
  80}
  81
  82void __init ip27_be_init(void)
  83{
  84        /* XXX Initialize all the Hub & Bridge error handling here.  */
  85        int cpu = LOCAL_HUB_L(PI_CPU_NUM);
  86        int cpuoff = cpu << 8;
  87
  88        board_be_handler = ip27_be_handler;
  89
  90        LOCAL_HUB_S(PI_ERR_INT_PEND,
  91                    cpu ? PI_ERR_CLEAR_ALL_B : PI_ERR_CLEAR_ALL_A);
  92        LOCAL_HUB_S(PI_ERR_INT_MASK_A + cpuoff, 0);
  93        LOCAL_HUB_S(PI_ERR_STACK_ADDR_A + cpuoff, 0);
  94        LOCAL_HUB_S(PI_ERR_STACK_SIZE, 0);      /* Disable error stack */
  95        LOCAL_HUB_S(PI_SYSAD_ERRCHK_EN, PI_SYSAD_CHECK_ALL);
  96}
  97