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Linux/arch/mips/sgi-ip22/ip22-berr.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * ip22-berr.c: Bus error handling.
  4  *
  5  * Copyright (C) 2002, 2003 Ladislav Michl (ladis@linux-mips.org)
  6  */
  7 
  8 #include <linux/init.h>
  9 #include <linux/kernel.h>
 10 #include <linux/sched/signal.h>
 11 
 12 #include <asm/addrspace.h>
 13 #include <asm/traps.h>
 14 #include <asm/branch.h>
 15 #include <asm/irq_regs.h>
 16 #include <asm/sgi/mc.h>
 17 #include <asm/sgi/hpc3.h>
 18 #include <asm/sgi/ioc.h>
 19 #include <asm/sgi/ip22.h>
 20 
 21 
 22 static unsigned int cpu_err_stat;       /* Status reg for CPU */
 23 static unsigned int gio_err_stat;       /* Status reg for GIO */
 24 static unsigned int cpu_err_addr;       /* Error address reg for CPU */
 25 static unsigned int gio_err_addr;       /* Error address reg for GIO */
 26 static unsigned int extio_stat;
 27 static unsigned int hpc3_berr_stat;     /* Bus error interrupt status */
 28 
 29 static void save_and_clear_buserr(void)
 30 {
 31         /* save status registers */
 32         cpu_err_addr = sgimc->cerr;
 33         cpu_err_stat = sgimc->cstat;
 34         gio_err_addr = sgimc->gerr;
 35         gio_err_stat = sgimc->gstat;
 36         extio_stat = ip22_is_fullhouse() ? sgioc->extio : (sgint->errstat << 4);
 37         hpc3_berr_stat = hpc3c0->bestat;
 38 
 39         sgimc->cstat = sgimc->gstat = 0;
 40 }
 41 
 42 #define GIO_ERRMASK     0xff00
 43 #define CPU_ERRMASK     0x3f00
 44 
 45 static void print_buserr(void)
 46 {
 47         if (extio_stat & EXTIO_MC_BUSERR)
 48                 printk(KERN_ERR "MC Bus Error\n");
 49         if (extio_stat & EXTIO_HPC3_BUSERR)
 50                 printk(KERN_ERR "HPC3 Bus Error 0x%x:<id=0x%x,%s,lane=0x%x>\n",
 51                         hpc3_berr_stat,
 52                         (hpc3_berr_stat & HPC3_BESTAT_PIDMASK) >>
 53                                           HPC3_BESTAT_PIDSHIFT,
 54                         (hpc3_berr_stat & HPC3_BESTAT_CTYPE) ? "PIO" : "DMA",
 55                         hpc3_berr_stat & HPC3_BESTAT_BLMASK);
 56         if (extio_stat & EXTIO_EISA_BUSERR)
 57                 printk(KERN_ERR "EISA Bus Error\n");
 58         if (cpu_err_stat & CPU_ERRMASK)
 59                 printk(KERN_ERR "CPU error 0x%x<%s%s%s%s%s%s> @ 0x%08x\n",
 60                         cpu_err_stat,
 61                         cpu_err_stat & SGIMC_CSTAT_RD ? "RD " : "",
 62                         cpu_err_stat & SGIMC_CSTAT_PAR ? "PAR " : "",
 63                         cpu_err_stat & SGIMC_CSTAT_ADDR ? "ADDR " : "",
 64                         cpu_err_stat & SGIMC_CSTAT_SYSAD_PAR ? "SYSAD " : "",
 65                         cpu_err_stat & SGIMC_CSTAT_SYSCMD_PAR ? "SYSCMD " : "",
 66                         cpu_err_stat & SGIMC_CSTAT_BAD_DATA ? "BAD_DATA " : "",
 67                         cpu_err_addr);
 68         if (gio_err_stat & GIO_ERRMASK)
 69                 printk(KERN_ERR "GIO error 0x%x:<%s%s%s%s%s%s%s%s> @ 0x%08x\n",
 70                         gio_err_stat,
 71                         gio_err_stat & SGIMC_GSTAT_RD ? "RD " : "",
 72                         gio_err_stat & SGIMC_GSTAT_WR ? "WR " : "",
 73                         gio_err_stat & SGIMC_GSTAT_TIME ? "TIME " : "",
 74                         gio_err_stat & SGIMC_GSTAT_PROM ? "PROM " : "",
 75                         gio_err_stat & SGIMC_GSTAT_ADDR ? "ADDR " : "",
 76                         gio_err_stat & SGIMC_GSTAT_BC ? "BC " : "",
 77                         gio_err_stat & SGIMC_GSTAT_PIO_RD ? "PIO_RD " : "",
 78                         gio_err_stat & SGIMC_GSTAT_PIO_WR ? "PIO_WR " : "",
 79                         gio_err_addr);
 80 }
 81 
 82 /*
 83  * MC sends an interrupt whenever bus or parity errors occur. In addition,
 84  * if the error happened during a CPU read, it also asserts the bus error
 85  * pin on the R4K. Code in bus error handler save the MC bus error registers
 86  * and then clear the interrupt when this happens.
 87  */
 88 
 89 void ip22_be_interrupt(int irq)
 90 {
 91         const int field = 2 * sizeof(unsigned long);
 92         struct pt_regs *regs = get_irq_regs();
 93 
 94         save_and_clear_buserr();
 95         print_buserr();
 96         printk(KERN_ALERT "%s bus error, epc == %0*lx, ra == %0*lx\n",
 97                (regs->cp0_cause & 4) ? "Data" : "Instruction",
 98                field, regs->cp0_epc, field, regs->regs[31]);
 99         /* Assume it would be too dangerous to continue ... */
100         die_if_kernel("Oops", regs);
101         force_sig(SIGBUS);
102 }
103 
104 static int ip22_be_handler(struct pt_regs *regs, int is_fixup)
105 {
106         save_and_clear_buserr();
107         if (is_fixup)
108                 return MIPS_BE_FIXUP;
109         print_buserr();
110         return MIPS_BE_FATAL;
111 }
112 
113 void __init ip22_be_init(void)
114 {
115         board_be_handler = ip22_be_handler;
116 }
117 

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