diff options
Diffstat (limited to 'arch/arm64/kernel/smp.c')
| -rw-r--r-- | arch/arm64/kernel/smp.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 7bf10c09ef32..a0a06580bcef 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -37,6 +37,7 @@ #include <linux/completion.h> #include <linux/of.h> #include <linux/irq_work.h> +#include <linux/nmi.h> #include <asm/alternative.h> #include <asm/atomic.h> @@ -76,7 +77,8 @@ enum ipi_msg_type { IPI_CPU_STOP, IPI_TIMER, IPI_IRQ_WORK, - IPI_WAKEUP + IPI_WAKEUP, + IPI_CPU_BACKTRACE, }; #ifdef CONFIG_ARM64_VHE @@ -770,6 +772,7 @@ static const char *ipi_types[NR_IPI] __tracepoint_string = { S(IPI_TIMER, "Timer broadcast interrupts"), S(IPI_IRQ_WORK, "IRQ work interrupts"), S(IPI_WAKEUP, "CPU wake-up interrupts"), + S(IPI_CPU_BACKTRACE, "backtrace interrupts"), }; static void smp_cross_call(const struct cpumask *target, unsigned int ipinr) @@ -895,6 +898,14 @@ void handle_IPI(int ipinr, struct pt_regs *regs) break; #endif + case IPI_CPU_BACKTRACE: + printk_nmi_enter(); + irq_enter(); + nmi_cpu_backtrace(regs); + irq_exit(); + printk_nmi_exit(); + break; + default: pr_crit("CPU%u: Unknown IPI message 0x%x\n", cpu, ipinr); break; @@ -968,3 +979,13 @@ bool cpus_are_stuck_in_kernel(void) return !!cpus_stuck_in_kernel || smp_spin_tables; } + +static void raise_nmi(cpumask_t *mask) +{ + smp_cross_call(mask, IPI_CPU_BACKTRACE); +} + +void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self) +{ + nmi_trigger_cpumask_backtrace(mask, exclude_self, raise_nmi); +} |