1 /* 2 * ip22-berr.c: Bus error handling. 3 * 4 * Copyright (C) 2002, 2003 Ladislav Michl (ladis@linux-mips.org) 5 */ 6 7 #include <linux/init.h> 8 #include <linux/kernel.h> 9 #include <linux/sched/signal.h> 10 11 #include <asm/addrspace.h> 12 #include <asm/traps.h> 13 #include <asm/branch.h> 14 #include <asm/irq_regs.h> 15 #include <asm/sgi/mc.h> 16 #include <asm/sgi/hpc3.h> 17 #include <asm/sgi/ioc.h> 18 #include <asm/sgi/ip22.h> 19 20 21 static unsigned int cpu_err_stat; /* Status reg for CPU */ 22 static unsigned int gio_err_stat; /* Status reg for GIO */ 23 static unsigned int cpu_err_addr; /* Error address reg for CPU */ 24 static unsigned int gio_err_addr; /* Error address reg for GIO */ 25 static unsigned int extio_stat; 26 static unsigned int hpc3_berr_stat; /* Bus error interrupt status */ 27 28 static void save_and_clear_buserr(void) 29 { 30 /* save status registers */ 31 cpu_err_addr = sgimc->cerr; 32 cpu_err_stat = sgimc->cstat; 33 gio_err_addr = sgimc->gerr; 34 gio_err_stat = sgimc->gstat; 35 extio_stat = ip22_is_fullhouse() ? sgioc->extio : (sgint->errstat << 4); 36 hpc3_berr_stat = hpc3c0->bestat; 37 38 sgimc->cstat = sgimc->gstat = 0; 39 } 40 41 #define GIO_ERRMASK 0xff00 42 #define CPU_ERRMASK 0x3f00 43 44 static void print_buserr(void) 45 { 46 if (extio_stat & EXTIO_MC_BUSERR) 47 printk(KERN_ERR "MC Bus Error\n"); 48 if (extio_stat & EXTIO_HPC3_BUSERR) 49 printk(KERN_ERR "HPC3 Bus Error 0x%x:<id=0x%x,%s,lane=0x%x>\n", 50 hpc3_berr_stat, 51 (hpc3_berr_stat & HPC3_BESTAT_PIDMASK) >> 52 HPC3_BESTAT_PIDSHIFT, 53 (hpc3_berr_stat & HPC3_BESTAT_CTYPE) ? "PIO" : "DMA", 54 hpc3_berr_stat & HPC3_BESTAT_BLMASK); 55 if (extio_stat & EXTIO_EISA_BUSERR) 56 printk(KERN_ERR "EISA Bus Error\n"); 57 if (cpu_err_stat & CPU_ERRMASK) 58 printk(KERN_ERR "CPU error 0x%x<%s%s%s%s%s%s> @ 0x%08x\n", 59 cpu_err_stat, 60 cpu_err_stat & SGIMC_CSTAT_RD ? "RD " : "", 61 cpu_err_stat & SGIMC_CSTAT_PAR ? "PAR " : "", 62 cpu_err_stat & SGIMC_CSTAT_ADDR ? "ADDR " : "", 63 cpu_err_stat & SGIMC_CSTAT_SYSAD_PAR ? "SYSAD " : "", 64 cpu_err_stat & SGIMC_CSTAT_SYSCMD_PAR ? "SYSCMD " : "", 65 cpu_err_stat & SGIMC_CSTAT_BAD_DATA ? "BAD_DATA " : "", 66 cpu_err_addr); 67 if (gio_err_stat & GIO_ERRMASK) 68 printk(KERN_ERR "GIO error 0x%x:<%s%s%s%s%s%s%s%s> @ 0x%08x\n", 69 gio_err_stat, 70 gio_err_stat & SGIMC_GSTAT_RD ? "RD " : "", 71 gio_err_stat & SGIMC_GSTAT_WR ? "WR " : "", 72 gio_err_stat & SGIMC_GSTAT_TIME ? "TIME " : "", 73 gio_err_stat & SGIMC_GSTAT_PROM ? "PROM " : "", 74 gio_err_stat & SGIMC_GSTAT_ADDR ? "ADDR " : "", 75 gio_err_stat & SGIMC_GSTAT_BC ? "BC " : "", 76 gio_err_stat & SGIMC_GSTAT_PIO_RD ? "PIO_RD " : "", 77 gio_err_stat & SGIMC_GSTAT_PIO_WR ? "PIO_WR " : "", 78 gio_err_addr); 79 } 80 81 /* 82 * MC sends an interrupt whenever bus or parity errors occur. In addition, 83 * if the error happened during a CPU read, it also asserts the bus error 84 * pin on the R4K. Code in bus error handler save the MC bus error registers 85 * and then clear the interrupt when this happens. 86 */ 87 88 void ip22_be_interrupt(int irq) 89 { 90 const int field = 2 * sizeof(unsigned long); 91 struct pt_regs *regs = get_irq_regs(); 92 93 save_and_clear_buserr(); 94 print_buserr(); 95 printk(KERN_ALERT "%s bus error, epc == %0*lx, ra == %0*lx\n", 96 (regs->cp0_cause & 4) ? "Data" : "Instruction", 97 field, regs->cp0_epc, field, regs->regs[31]); 98 /* Assume it would be too dangerous to continue ... */ 99 die_if_kernel("Oops", regs); 100 force_sig(SIGBUS, current); 101 } 102 103 static int ip22_be_handler(struct pt_regs *regs, int is_fixup) 104 { 105 save_and_clear_buserr(); 106 if (is_fixup) 107 return MIPS_BE_FIXUP; 108 print_buserr(); 109 return MIPS_BE_FATAL; 110 } 111 112 void __init ip22_be_init(void) 113 { 114 board_be_handler = ip22_be_handler; 115 } 116