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
25 #include "ip27-common.h"
26
27 static void dump_hub_information(unsigned long errst0, unsigned long errst1)
28 {
29 static char *err_type[2][8] = {
30 { NULL, "Uncached Partial Read PRERR", "DERR", "Read Timeout",
31 NULL, NULL, NULL, NULL },
32 { "WERR", "Uncached Partial Write", "PWERR", "Write Timeout",
33 NULL, NULL, NULL, NULL }
34 };
35 union pi_err_stat0 st0;
36 union pi_err_stat1 st1;
37
38 st0.pi_stat0_word = errst0;
39 st1.pi_stat1_word = errst1;
40
41 if (!st0.pi_stat0_fmt.s0_valid) {
42 pr_info("Hub does not contain valid error information\n");
43 return;
44 }
45
46 pr_info("Hub has valid error information:\n");
47 if (st0.pi_stat0_fmt.s0_ovr_run)
48 pr_info("Overrun is set. Error stack may contain additional "
49 "information.\n");
50 pr_info("Hub error address is %08lx\n",
51 (unsigned long)st0.pi_stat0_fmt.s0_addr);
52 pr_info("Incoming message command 0x%lx\n",
53 (unsigned long)st0.pi_stat0_fmt.s0_cmd);
54 pr_info("Supplemental field of incoming message is 0x%lx\n",
55 (unsigned long)st0.pi_stat0_fmt.s0_supl);
56 pr_info("T5 Rn (for RRB only) is 0x%lx\n",
57 (unsigned long)st0.pi_stat0_fmt.s0_t5_req);
58 pr_info("Error type is %s\n", err_type[st1.pi_stat1_fmt.s1_rw_rb]
59 [st0.pi_stat0_fmt.s0_err_type] ? : "invalid");
60 }
61
62 static int ip27_be_handler(struct pt_regs *regs, int is_fixup)
63 {
64 unsigned long errst0, errst1;
65 int data = regs->cp0_cause & 4;
66 int cpu = LOCAL_HUB_L(PI_CPU_NUM);
67
68 if (is_fixup)
69 return MIPS_BE_FIXUP;
70
71 printk("Slice %c got %cbe at 0x%lx\n", 'A' + cpu, data ? 'd' : 'i',
72 regs->cp0_epc);
73 printk("Hub information:\n");
74 printk("ERR_INT_PEND = 0x%06llx\n", LOCAL_HUB_L(PI_ERR_INT_PEND));
75 errst0 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS0_B : PI_ERR_STATUS0_A);
76 errst1 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS1_B : PI_ERR_STATUS1_A);
77 dump_hub_information(errst0, errst1);
78 show_regs(regs);
79 dump_tlb_all();
80 while(1);
81 force_sig(SIGBUS);
82 }
83
84 void __init ip27_be_init(void)
85 {
86 /* XXX Initialize all the Hub & Bridge error handling here. */
87 int cpu = LOCAL_HUB_L(PI_CPU_NUM);
88 int cpuoff = cpu << 8;
89
90 mips_set_be_handler(ip27_be_handler);
91
92 LOCAL_HUB_S(PI_ERR_INT_PEND,
93 cpu ? PI_ERR_CLEAR_ALL_B : PI_ERR_CLEAR_ALL_A);
94 LOCAL_HUB_S(PI_ERR_INT_MASK_A + cpuoff, 0);
95 LOCAL_HUB_S(PI_ERR_STACK_ADDR_A + cpuoff, 0);
96 LOCAL_HUB_S(PI_ERR_STACK_SIZE, 0); /* Disable error stack */
97 LOCAL_HUB_S(PI_SYSAD_ERRCHK_EN, PI_SYSAD_CHECK_ALL);
98 }
99
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