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
  15 #include <asm/sn/addrs.h>
  16 #include <asm/sn/arch.h>
  17 #include <asm/sn/sn0/hub.h>
  18 #include <asm/tlbdebug.h>
  19 #include <asm/traps.h>
  20 #include <linux/uaccess.h>
  21
  22 static void dump_hub_information(unsigned long errst0, unsigned long errst1)
  23 {
  24         static char *err_type[2][8] = {
  25                 { NULL, "Uncached Partial Read PRERR", "DERR", "Read Timeout",
  26                   NULL, NULL, NULL, NULL },
  27                 { "WERR", "Uncached Partial Write", "PWERR", "Write Timeout",
  28                   NULL, NULL, NULL, NULL }
  29         };
  30         int wrb = errst1 & PI_ERR_ST1_WRBRRB_MASK;
  31
  32         if (!(errst0 & PI_ERR_ST0_VALID_MASK)) {
  33                 printk("Hub does not contain valid error information\n");
  34                 return;
  35         }
  36
  37
  38         printk("Hub has valid error information:\n");
  39         if (errst0 & PI_ERR_ST0_OVERRUN_MASK)
  40                 printk("Overrun is set.  Error stack may contain additional "
  41                        "information.\n");
  42         printk("Hub error address is %08lx\n",
  43                (errst0 & PI_ERR_ST0_ADDR_MASK) >> (PI_ERR_ST0_ADDR_SHFT - 3));
  44         printk("Incoming message command 0x%lx\n",
  45                (errst0 & PI_ERR_ST0_CMD_MASK) >> PI_ERR_ST0_CMD_SHFT);
  46         printk("Supplemental field of incoming message is 0x%lx\n",
  47                (errst0 & PI_ERR_ST0_SUPPL_MASK) >> PI_ERR_ST0_SUPPL_SHFT);
  48         printk("T5 Rn (for RRB only) is 0x%lx\n",
  49                (errst0 & PI_ERR_ST0_REQNUM_MASK) >> PI_ERR_ST0_REQNUM_SHFT);
  50         printk("Error type is %s\n", err_type[wrb]
  51                [(errst0 & PI_ERR_ST0_TYPE_MASK) >> PI_ERR_ST0_TYPE_SHFT]
  52                 ? : "invalid");
  53 }
  54
  55 int ip27_be_handler(struct pt_regs *regs, int is_fixup)
  56 {
  57         unsigned long errst0, errst1;
  58         int data = regs->cp0_cause & 4;
  59         int cpu = LOCAL_HUB_L(PI_CPU_NUM);
  60
  61         if (is_fixup)
  62                 return MIPS_BE_FIXUP;
  63
  64         printk("Slice %c got %cbe at 0x%lx\n", 'A' + cpu, data ? 'd' : 'i',
  65                regs->cp0_epc);
  66         printk("Hub information:\n");
  67         printk("ERR_INT_PEND = 0x%06llx\n", LOCAL_HUB_L(PI_ERR_INT_PEND));
  68         errst0 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS0_B : PI_ERR_STATUS0_A);
  69         errst1 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS1_B : PI_ERR_STATUS1_A);
  70         dump_hub_information(errst0, errst1);
  71         show_regs(regs);
  72         dump_tlb_all();
  73         while(1);
  74         force_sig(SIGBUS, current);
  75 }
  76
  77 void __init ip27_be_init(void)
  78 {
  79         /* XXX Initialize all the Hub & Bridge error handling here.  */
  80         int cpu = LOCAL_HUB_L(PI_CPU_NUM);
  81         int cpuoff = cpu << 8;
  82
  83         board_be_handler = ip27_be_handler;
  84
  85         LOCAL_HUB_S(PI_ERR_INT_PEND,
  86                     cpu ? PI_ERR_CLEAR_ALL_B : PI_ERR_CLEAR_ALL_A);
  87         LOCAL_HUB_S(PI_ERR_INT_MASK_A + cpuoff, 0);
  88         LOCAL_HUB_S(PI_ERR_STACK_ADDR_A + cpuoff, 0);
  89         LOCAL_HUB_S(PI_ERR_STACK_SIZE, 0);      /* Disable error stack */
  90         LOCAL_HUB_S(PI_SYSAD_ERRCHK_EN, PI_SYSAD_CHECK_ALL);
  91 }