diff options
| author | Max Filippov <jcmvbkbc@gmail.com> | 2015-07-16 10:37:31 +0300 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2015-08-17 07:33:39 +0300 |
| commit | 38fef73c21d117cf992fb5ec6e30630e54e13f4f (patch) | |
| tree | ca3aae4c2e29ee81c66dcc16eb835e0b8c4e631f /arch/xtensa/kernel/irq.c | |
| parent | 98e298329e7b391293da5097817437292c842dc9 (diff) | |
xtensa: implement fake NMI
In case perf IRQ is the highest of the medium-level IRQs, and is alone
on its level, it may be treated as NMI:
- LOCKLEVEL is defined to be one level less than EXCM level,
- IRQ masking never lowers current IRQ level,
- new fake exception cause code, EXCCAUSE_MAPPED_NMI is assigned to that
IRQ; new second level exception handler, do_nmi, assigned to it
handles it as NMI,
- atomic operations in configurations without s32c1i still need to mask
all interrupts.
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/kernel/irq.c')
| -rw-r--r-- | arch/xtensa/kernel/irq.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/irq.c b/arch/xtensa/kernel/irq.c index 32b60568ee45..91ba60563021 100644 --- a/arch/xtensa/kernel/irq.c +++ b/arch/xtensa/kernel/irq.c @@ -29,6 +29,7 @@ #include <asm/platform.h> atomic_t irq_err_count; +DECLARE_PER_CPU(unsigned long, nmi_count); asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs) { @@ -57,11 +58,18 @@ asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs) int arch_show_interrupts(struct seq_file *p, int prec) { + unsigned cpu __maybe_unused; #ifdef CONFIG_SMP show_ipi_list(p, prec); #endif seq_printf(p, "%*s: ", prec, "ERR"); seq_printf(p, "%10u\n", atomic_read(&irq_err_count)); +#if XTENSA_FAKE_NMI + seq_printf(p, "%*s:", prec, "NMI"); + for_each_online_cpu(cpu) + seq_printf(p, " %10lu", per_cpu(nmi_count, cpu)); + seq_puts(p, " Non-maskable interrupts\n"); +#endif return 0; } |