1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * ip22-berr.c: Bus error handling. |
4 | * |
5 | * Copyright (C) 2002, 2003 Ladislav Michl (ladis@linux-mips.org) |
6 | */ |
7 | |
8 | #include <linux/init.h> |
9 | #include <linux/kernel.h> |
10 | #include <linux/sched/signal.h> |
11 | |
12 | #include <asm/addrspace.h> |
13 | #include <asm/traps.h> |
14 | #include <asm/branch.h> |
15 | #include <asm/irq_regs.h> |
16 | #include <asm/sgi/mc.h> |
17 | #include <asm/sgi/hpc3.h> |
18 | #include <asm/sgi/ioc.h> |
19 | #include <asm/sgi/ip22.h> |
20 | |
21 | |
22 | static unsigned int cpu_err_stat; /* Status reg for CPU */ |
23 | static unsigned int gio_err_stat; /* Status reg for GIO */ |
24 | static unsigned int cpu_err_addr; /* Error address reg for CPU */ |
25 | static unsigned int gio_err_addr; /* Error address reg for GIO */ |
26 | static unsigned int extio_stat; |
27 | static unsigned int hpc3_berr_stat; /* Bus error interrupt status */ |
28 | |
29 | static void save_and_clear_buserr(void) |
30 | { |
31 | /* save status registers */ |
32 | cpu_err_addr = sgimc->cerr; |
33 | cpu_err_stat = sgimc->cstat; |
34 | gio_err_addr = sgimc->gerr; |
35 | gio_err_stat = sgimc->gstat; |
36 | extio_stat = ip22_is_fullhouse() ? sgioc->extio : (sgint->errstat << 4); |
37 | hpc3_berr_stat = hpc3c0->bestat; |
38 | |
39 | sgimc->cstat = sgimc->gstat = 0; |
40 | } |
41 | |
42 | #define GIO_ERRMASK 0xff00 |
43 | #define CPU_ERRMASK 0x3f00 |
44 | |
45 | static void print_buserr(void) |
46 | { |
47 | if (extio_stat & EXTIO_MC_BUSERR) |
48 | printk(KERN_ERR "MC Bus Error\n" ); |
49 | if (extio_stat & EXTIO_HPC3_BUSERR) |
50 | printk(KERN_ERR "HPC3 Bus Error 0x%x:<id=0x%x,%s,lane=0x%x>\n" , |
51 | hpc3_berr_stat, |
52 | (hpc3_berr_stat & HPC3_BESTAT_PIDMASK) >> |
53 | HPC3_BESTAT_PIDSHIFT, |
54 | (hpc3_berr_stat & HPC3_BESTAT_CTYPE) ? "PIO" : "DMA" , |
55 | hpc3_berr_stat & HPC3_BESTAT_BLMASK); |
56 | if (extio_stat & EXTIO_EISA_BUSERR) |
57 | printk(KERN_ERR "EISA Bus Error\n" ); |
58 | if (cpu_err_stat & CPU_ERRMASK) |
59 | printk(KERN_ERR "CPU error 0x%x<%s%s%s%s%s%s> @ 0x%08x\n" , |
60 | cpu_err_stat, |
61 | cpu_err_stat & SGIMC_CSTAT_RD ? "RD " : "" , |
62 | cpu_err_stat & SGIMC_CSTAT_PAR ? "PAR " : "" , |
63 | cpu_err_stat & SGIMC_CSTAT_ADDR ? "ADDR " : "" , |
64 | cpu_err_stat & SGIMC_CSTAT_SYSAD_PAR ? "SYSAD " : "" , |
65 | cpu_err_stat & SGIMC_CSTAT_SYSCMD_PAR ? "SYSCMD " : "" , |
66 | cpu_err_stat & SGIMC_CSTAT_BAD_DATA ? "BAD_DATA " : "" , |
67 | cpu_err_addr); |
68 | if (gio_err_stat & GIO_ERRMASK) |
69 | printk(KERN_ERR "GIO error 0x%x:<%s%s%s%s%s%s%s%s> @ 0x%08x\n" , |
70 | gio_err_stat, |
71 | gio_err_stat & SGIMC_GSTAT_RD ? "RD " : "" , |
72 | gio_err_stat & SGIMC_GSTAT_WR ? "WR " : "" , |
73 | gio_err_stat & SGIMC_GSTAT_TIME ? "TIME " : "" , |
74 | gio_err_stat & SGIMC_GSTAT_PROM ? "PROM " : "" , |
75 | gio_err_stat & SGIMC_GSTAT_ADDR ? "ADDR " : "" , |
76 | gio_err_stat & SGIMC_GSTAT_BC ? "BC " : "" , |
77 | gio_err_stat & SGIMC_GSTAT_PIO_RD ? "PIO_RD " : "" , |
78 | gio_err_stat & SGIMC_GSTAT_PIO_WR ? "PIO_WR " : "" , |
79 | gio_err_addr); |
80 | } |
81 | |
82 | /* |
83 | * MC sends an interrupt whenever bus or parity errors occur. In addition, |
84 | * if the error happened during a CPU read, it also asserts the bus error |
85 | * pin on the R4K. Code in bus error handler save the MC bus error registers |
86 | * and then clear the interrupt when this happens. |
87 | */ |
88 | |
89 | void ip22_be_interrupt(int irq) |
90 | { |
91 | const int field = 2 * sizeof(unsigned long); |
92 | struct pt_regs *regs = get_irq_regs(); |
93 | |
94 | save_and_clear_buserr(); |
95 | print_buserr(); |
96 | printk(KERN_ALERT "%s bus error, epc == %0*lx, ra == %0*lx\n" , |
97 | (regs->cp0_cause & 4) ? "Data" : "Instruction" , |
98 | field, regs->cp0_epc, field, regs->regs[31]); |
99 | /* Assume it would be too dangerous to continue ... */ |
100 | die_if_kernel("Oops" , regs); |
101 | force_sig(SIGBUS); |
102 | } |
103 | |
104 | static int ip22_be_handler(struct pt_regs *regs, int is_fixup) |
105 | { |
106 | save_and_clear_buserr(); |
107 | if (is_fixup) |
108 | return MIPS_BE_FIXUP; |
109 | print_buserr(); |
110 | return MIPS_BE_FATAL; |
111 | } |
112 | |
113 | void __init ip22_be_init(void) |
114 | { |
115 | mips_set_be_handler(ip22_be_handler); |
116 | } |
117 | |