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/arch/mips/sgi-ip27/ip27-berr.c

http://github.com/mirrors/linux
C | 96 lines | 75 code | 11 blank | 10 comment | 3 complexity | 2b09d368a7c690a7e90ee315d4ecb900 MD5 | raw file
 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
25static 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
60int 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
82void __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}