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 } 92