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/arch.h> 20 #include <asm/sn/sn0/hub.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 int wrb = errst1 & PI_ERR_ST1_WRBRRB_MASK; 34 35 if (!(errst0 & PI_ERR_ST0_VALID_MASK)) { 36 printk("Hub does not contain valid error information\n"); 37 return; 38 } 39 40 41 printk("Hub has valid error information:\n"); 42 if (errst0 & PI_ERR_ST0_OVERRUN_MASK) 43 printk("Overrun is set. Error stack may contain additional " 44 "information.\n"); 45 printk("Hub error address is %08lx\n", 46 (errst0 & PI_ERR_ST0_ADDR_MASK) >> (PI_ERR_ST0_ADDR_SHFT - 3)); 47 printk("Incoming message command 0x%lx\n", 48 (errst0 & PI_ERR_ST0_CMD_MASK) >> PI_ERR_ST0_CMD_SHFT); 49 printk("Supplemental field of incoming message is 0x%lx\n", 50 (errst0 & PI_ERR_ST0_SUPPL_MASK) >> PI_ERR_ST0_SUPPL_SHFT); 51 printk("T5 Rn (for RRB only) is 0x%lx\n", 52 (errst0 & PI_ERR_ST0_REQNUM_MASK) >> PI_ERR_ST0_REQNUM_SHFT); 53 printk("Error type is %s\n", err_type[wrb] 54 [(errst0 & PI_ERR_ST0_TYPE_MASK) >> PI_ERR_ST0_TYPE_SHFT] 55 ? : "invalid"); 56 } 57 58 int ip27_be_handler(struct pt_regs *regs, int is_fixup) 59 { 60 unsigned long errst0, errst1; 61 int data = regs->cp0_cause & 4; 62 int cpu = LOCAL_HUB_L(PI_CPU_NUM); 63 64 if (is_fixup) 65 return MIPS_BE_FIXUP; 66 67 printk("Slice %c got %cbe at 0x%lx\n", 'A' + cpu, data ? 'd' : 'i', 68 regs->cp0_epc); 69 printk("Hub information:\n"); 70 printk("ERR_INT_PEND = 0x%06llx\n", LOCAL_HUB_L(PI_ERR_INT_PEND)); 71 errst0 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS0_B : PI_ERR_STATUS0_A); 72 errst1 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS1_B : PI_ERR_STATUS1_A); 73 dump_hub_information(errst0, errst1); 74 show_regs(regs); 75 dump_tlb_all(); 76 while(1); 77 force_sig(SIGBUS, current); 78 } 79 80 void __init ip27_be_init(void) 81 { 82 /* XXX Initialize all the Hub & Bridge error handling here. */ 83 int cpu = LOCAL_HUB_L(PI_CPU_NUM); 84 int cpuoff = cpu << 8; 85 86 board_be_handler = ip27_be_handler; 87 88 LOCAL_HUB_S(PI_ERR_INT_PEND, 89 cpu ? PI_ERR_CLEAR_ALL_B : PI_ERR_CLEAR_ALL_A); 90 LOCAL_HUB_S(PI_ERR_INT_MASK_A + cpuoff, 0); 91 LOCAL_HUB_S(PI_ERR_STACK_ADDR_A + cpuoff, 0); 92 LOCAL_HUB_S(PI_ERR_STACK_SIZE, 0); /* Disable error stack */ 93 LOCAL_HUB_S(PI_SYSAD_ERRCHK_EN, PI_SYSAD_CHECK_ALL); 94 } 95