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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/mips/sgi-ip27/ip27-berr.c
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/*

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 * This file is subject to the terms and conditions of the GNU General Public

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 * License.  See the file "COPYING" in the main directory of this archive

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 * for more details.

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 *

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 * Copyright (C) 1994, 1995, 1996, 1999, 2000 by Ralf Baechle

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 * Copyright (C) 1999, 2000 by Silicon Graphics

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 * Copyright (C) 2002  Maciej W. Rozycki

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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/module.h>

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#include <linux/signal.h>	/* for SIGBUS */

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#include <linux/sched.h>	/* schow_regs(), force_sig() */

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#include <asm/module.h>

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#include <asm/sn/addrs.h>

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#include <asm/sn/arch.h>

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#include <asm/sn/sn0/hub.h>

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#include <asm/tlbdebug.h>

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#include <asm/traps.h>

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#include <asm/uaccess.h>

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static void dump_hub_information(unsigned long errst0, unsigned long errst1)

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{

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	static char *err_type[2][8] = {

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		{ NULL, "Uncached Partial Read PRERR", "DERR", "Read Timeout",

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		  NULL, NULL, NULL, NULL },

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		{ "WERR", "Uncached Partial Write", "PWERR", "Write Timeout",

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		  NULL, NULL, NULL, NULL }

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	};

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	int wrb = errst1 & PI_ERR_ST1_WRBRRB_MASK;

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	if (!(errst0 & PI_ERR_ST0_VALID_MASK)) {

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		printk("Hub does not contain valid error information\n");

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		return;

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	}

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	printk("Hub has valid error information:\n");

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	if (errst0 & PI_ERR_ST0_OVERRUN_MASK)

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		printk("Overrun is set.  Error stack may contain additional "

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		       "information.\n");

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	printk("Hub error address is %08lx\n",

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	       (errst0 & PI_ERR_ST0_ADDR_MASK) >> (PI_ERR_ST0_ADDR_SHFT - 3));

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	printk("Incoming message command 0x%lx\n",

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	       (errst0 & PI_ERR_ST0_CMD_MASK) >> PI_ERR_ST0_CMD_SHFT);

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	printk("Supplemental field of incoming message is 0x%lx\n",

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	       (errst0 & PI_ERR_ST0_SUPPL_MASK) >> PI_ERR_ST0_SUPPL_SHFT);

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	printk("T5 Rn (for RRB only) is 0x%lx\n",

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	       (errst0 & PI_ERR_ST0_REQNUM_MASK) >> PI_ERR_ST0_REQNUM_SHFT);

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	printk("Error type is %s\n", err_type[wrb]

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	       [(errst0 & PI_ERR_ST0_TYPE_MASK) >> PI_ERR_ST0_TYPE_SHFT]

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		? : "invalid");

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}

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int ip27_be_handler(struct pt_regs *regs, int is_fixup)

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{

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	unsigned long errst0, errst1;

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	int data = regs->cp0_cause & 4;

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	int cpu = LOCAL_HUB_L(PI_CPU_NUM);

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	if (is_fixup)

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		return MIPS_BE_FIXUP;

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	printk("Slice %c got %cbe at 0x%lx\n", 'A' + cpu, data ? 'd' : 'i',

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	       regs->cp0_epc);

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	printk("Hub information:\n");

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	printk("ERR_INT_PEND = 0x%06llx\n", LOCAL_HUB_L(PI_ERR_INT_PEND));

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	errst0 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS0_B : PI_ERR_STATUS0_A);

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	errst1 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS1_B : PI_ERR_STATUS1_A);

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	dump_hub_information(errst0, errst1);

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	show_regs(regs);

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	dump_tlb_all();

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	while(1);

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	force_sig(SIGBUS, current);

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}

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void __init ip27_be_init(void)

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{

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	/* XXX Initialize all the Hub & Bridge error handling here.  */

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	int cpu = LOCAL_HUB_L(PI_CPU_NUM);

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	int cpuoff = cpu << 8;

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	board_be_handler = ip27_be_handler;

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	LOCAL_HUB_S(PI_ERR_INT_PEND,

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	            cpu ? PI_ERR_CLEAR_ALL_B : PI_ERR_CLEAR_ALL_A);

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	LOCAL_HUB_S(PI_ERR_INT_MASK_A + cpuoff, 0);

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	LOCAL_HUB_S(PI_ERR_STACK_ADDR_A + cpuoff, 0);

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	LOCAL_HUB_S(PI_ERR_STACK_SIZE, 0);	/* Disable error stack */

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	LOCAL_HUB_S(PI_SYSAD_ERRCHK_EN, PI_SYSAD_CHECK_ALL);

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}

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