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
  25 static 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
  60 int 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
  82 void __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 }