diff options
Diffstat (limited to 'arch/s390/kernel/traps.c')
| -rw-r--r-- | arch/s390/kernel/traps.c | 41 |
1 files changed, 40 insertions, 1 deletions
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c index 564403496a7c..fcd8c1122ef5 100644 --- a/arch/s390/kernel/traps.c +++ b/arch/s390/kernel/traps.c @@ -9,7 +9,9 @@ * Copyright (C) 1991, 1992 Linus Torvalds */ +#include <linux/capability.h> #include <linux/cpufeature.h> +#include <linux/debugfs.h> #include <linux/kprobes.h> #include <linux/kdebug.h> #include <linux/randomize_kstack.h> @@ -33,6 +35,12 @@ #include <asm/fault.h> #include "entry.h" +struct pgm_stat { + unsigned int count[128]; +}; + +static DEFINE_PER_CPU_SHARED_ALIGNED(struct pgm_stat, pgm_stat); + static inline void __user *get_trap_ip(struct pt_regs *regs) { unsigned long address; @@ -332,6 +340,7 @@ void noinstr __do_pgm_check(struct pt_regs *regs) struct lowcore *lc = get_lowcore(); bool percpu_needs_fixup; irqentry_state_t state; + struct pgm_stat *stat; unsigned int trapnr; union teid teid; @@ -339,6 +348,10 @@ void noinstr __do_pgm_check(struct pt_regs *regs) regs->int_code = lc->pgm_int_code; regs->int_parm_long = teid.val; regs->monitor_code = lc->monitor_code; + + trapnr = regs->int_code & PGM_INT_CODE_MASK; + stat = this_cpu_ptr(&pgm_stat); + stat->count[trapnr]++; /* * In case of a guest fault, short-circuit the fault handler and return. * This way the sie64a() function will return 0; fault address and @@ -383,7 +396,6 @@ void noinstr __do_pgm_check(struct pt_regs *regs) if (!irqs_disabled_flags(regs->psw.mask)) trace_hardirqs_on(); __arch_local_irq_ssm(regs->psw.mask & ~PSW_MASK_PER); - trapnr = regs->int_code & PGM_INT_CODE_MASK; if (trapnr) pgm_check_table[trapnr](regs); out: @@ -393,6 +405,33 @@ out: percpu_exit(regs, percpu_needs_fixup); } +static int pgm_check_stat_show(struct seq_file *p, void *v) +{ + int i, cpu; + + cpus_read_lock(); + seq_puts(p, " "); + for_each_online_cpu(cpu) + seq_printf(p, "CPU%-8d", cpu); + seq_putc(p, '\n'); + for (i = 0; i < 128; i++) { + seq_printf(p, "%02x: ", i); + for_each_online_cpu(cpu) + seq_printf(p, "%10u ", per_cpu(pgm_stat, cpu).count[i]); + seq_putc(p, '\n'); + } + cpus_read_unlock(); + return 0; +} +DEFINE_SHOW_ATTRIBUTE(pgm_check_stat); + +static int __init debugfs_pgm_check_init(void) +{ + debugfs_create_file("exceptions", 0400, arch_debugfs_dir, NULL, &pgm_check_stat_fops); + return 0; +} +late_initcall(debugfs_pgm_check_init); + /* * The program check table contains exactly 128 (0x00-0x7f) entries. Each * line defines the function to be called corresponding to the program check |