117 lines
3.5 KiB
C
117 lines
3.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* ip22-berr.c: Bus error handling.
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*
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* Copyright (C) 2002, 2003 Ladislav Michl (ladis@linux-mips.org)
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/sched/signal.h>
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#include <asm/addrspace.h>
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#include <asm/traps.h>
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#include <asm/branch.h>
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#include <asm/irq_regs.h>
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#include <asm/sgi/mc.h>
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#include <asm/sgi/hpc3.h>
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#include <asm/sgi/ioc.h>
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#include <asm/sgi/ip22.h>
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static unsigned int cpu_err_stat; /* Status reg for CPU */
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static unsigned int gio_err_stat; /* Status reg for GIO */
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static unsigned int cpu_err_addr; /* Error address reg for CPU */
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static unsigned int gio_err_addr; /* Error address reg for GIO */
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static unsigned int extio_stat;
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static unsigned int hpc3_berr_stat; /* Bus error interrupt status */
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static void save_and_clear_buserr(void)
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{
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/* save status registers */
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cpu_err_addr = sgimc->cerr;
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cpu_err_stat = sgimc->cstat;
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gio_err_addr = sgimc->gerr;
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gio_err_stat = sgimc->gstat;
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extio_stat = ip22_is_fullhouse() ? sgioc->extio : (sgint->errstat << 4);
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hpc3_berr_stat = hpc3c0->bestat;
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sgimc->cstat = sgimc->gstat = 0;
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}
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#define GIO_ERRMASK 0xff00
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#define CPU_ERRMASK 0x3f00
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static void print_buserr(void)
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{
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if (extio_stat & EXTIO_MC_BUSERR)
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printk(KERN_ERR "MC Bus Error\n");
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if (extio_stat & EXTIO_HPC3_BUSERR)
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printk(KERN_ERR "HPC3 Bus Error 0x%x:<id=0x%x,%s,lane=0x%x>\n",
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hpc3_berr_stat,
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(hpc3_berr_stat & HPC3_BESTAT_PIDMASK) >>
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HPC3_BESTAT_PIDSHIFT,
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(hpc3_berr_stat & HPC3_BESTAT_CTYPE) ? "PIO" : "DMA",
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hpc3_berr_stat & HPC3_BESTAT_BLMASK);
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if (extio_stat & EXTIO_EISA_BUSERR)
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printk(KERN_ERR "EISA Bus Error\n");
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if (cpu_err_stat & CPU_ERRMASK)
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printk(KERN_ERR "CPU error 0x%x<%s%s%s%s%s%s> @ 0x%08x\n",
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cpu_err_stat,
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cpu_err_stat & SGIMC_CSTAT_RD ? "RD " : "",
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cpu_err_stat & SGIMC_CSTAT_PAR ? "PAR " : "",
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cpu_err_stat & SGIMC_CSTAT_ADDR ? "ADDR " : "",
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cpu_err_stat & SGIMC_CSTAT_SYSAD_PAR ? "SYSAD " : "",
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cpu_err_stat & SGIMC_CSTAT_SYSCMD_PAR ? "SYSCMD " : "",
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cpu_err_stat & SGIMC_CSTAT_BAD_DATA ? "BAD_DATA " : "",
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cpu_err_addr);
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if (gio_err_stat & GIO_ERRMASK)
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printk(KERN_ERR "GIO error 0x%x:<%s%s%s%s%s%s%s%s> @ 0x%08x\n",
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gio_err_stat,
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gio_err_stat & SGIMC_GSTAT_RD ? "RD " : "",
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gio_err_stat & SGIMC_GSTAT_WR ? "WR " : "",
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gio_err_stat & SGIMC_GSTAT_TIME ? "TIME " : "",
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gio_err_stat & SGIMC_GSTAT_PROM ? "PROM " : "",
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gio_err_stat & SGIMC_GSTAT_ADDR ? "ADDR " : "",
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gio_err_stat & SGIMC_GSTAT_BC ? "BC " : "",
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gio_err_stat & SGIMC_GSTAT_PIO_RD ? "PIO_RD " : "",
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gio_err_stat & SGIMC_GSTAT_PIO_WR ? "PIO_WR " : "",
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gio_err_addr);
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}
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/*
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* MC sends an interrupt whenever bus or parity errors occur. In addition,
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* if the error happened during a CPU read, it also asserts the bus error
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* pin on the R4K. Code in bus error handler save the MC bus error registers
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* and then clear the interrupt when this happens.
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*/
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void ip22_be_interrupt(int irq)
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{
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const int field = 2 * sizeof(unsigned long);
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struct pt_regs *regs = get_irq_regs();
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save_and_clear_buserr();
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print_buserr();
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printk(KERN_ALERT "%s bus error, epc == %0*lx, ra == %0*lx\n",
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(regs->cp0_cause & 4) ? "Data" : "Instruction",
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field, regs->cp0_epc, field, regs->regs[31]);
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/* Assume it would be too dangerous to continue ... */
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die_if_kernel("Oops", regs);
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force_sig(SIGBUS, current);
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}
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static int ip22_be_handler(struct pt_regs *regs, int is_fixup)
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{
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save_and_clear_buserr();
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if (is_fixup)
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return MIPS_BE_FIXUP;
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print_buserr();
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return MIPS_BE_FATAL;
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}
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void __init ip22_be_init(void)
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{
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board_be_handler = ip22_be_handler;
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}
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