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 
dump_hub_information(unsigned long errst0,unsigned long errst1)25 static 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 
ip27_be_handler(struct pt_regs * regs,int is_fixup)60 int 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 
ip27_be_init(void)82 void __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 	mips_set_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 }
97