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 } 97