Commit f86d165b authored by Li Zhengyu's avatar Li Zhengyu Committed by Zheng Zengkai
Browse files

arm64: Add non nmi ipi backtrace support 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I59IQS


CVE: NA

--------------------------------

Use non nmi ipi to support backtrace on arm64 with nmi
unsupported.
It has been tested on qemu.

Signed-off-by: default avatarLi Zhengyu <lizhengyu3@huawei.com>
Reviewed-by: default avatarLiao Chang <liaochang1@huawei.com>
Reviewed-by: default avatarWei Li <liwei391@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent d08151e6

arch/arm64/kernel/ipi_nmi.c

+15 −3
Original line number Diff line number Diff line
@@ -33,11 +33,23 @@ void arm64_send_nmi(cpumask_t *mask) 
	__ipi_send_mask(ipi_nmi_desc, mask);

}



static void ipi_cpu_backtrace(void *info)

{

	printk_safe_enter();

	nmi_cpu_backtrace(get_irq_regs());

	printk_safe_exit();

}



static void arm64_send_ipi(cpumask_t *mask)

{

	smp_call_function_many(mask, ipi_cpu_backtrace, NULL, false);

}



bool arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self)

{

	if (!ipi_nmi_desc)

		return false;



		nmi_trigger_cpumask_backtrace(mask, exclude_self, arm64_send_ipi);

	else

		nmi_trigger_cpumask_backtrace(mask, exclude_self, arm64_send_nmi);



	return true;