// SPDX-License-Identifier: GPL-2.0/* * MIPS specific sysrq operations. * * Copyright (C) 2015 Imagination Technologies Ltd. */#include <linux/init.h>#include <linux/smp.h>#include <linux/spinlock.h>#include <linux/sysrq.h>#include <linux/workqueue.h> #include <asm/cpu-features.h>#include <asm/mipsregs.h>#include <asm/tlbdebug.h> /* * Dump TLB entries on all CPUs. */ static DEFINE_SPINLOCK(show_lock); static void sysrq_tlbdump_single(void *dummy){	unsigned long flags; 	spin_lock_irqsave(&show_lock, flags); 	pr_info("CPU%d:\n", smp_processor_id());	dump_tlb_regs();	pr_info("\n");	dump_tlb_all();	pr_info("\n"); 	spin_unlock_irqrestore(&show_lock, flags);} #ifdef CONFIG_SMPstatic void sysrq_tlbdump_othercpus(struct work_struct *dummy){	smp_call_function(sysrq_tlbdump_single, NULL, 0);} static DECLARE_WORK(sysrq_tlbdump, sysrq_tlbdump_othercpus);#endif static void sysrq_handle_tlbdump(u8 key){	sysrq_tlbdump_single(NULL);#ifdef CONFIG_SMP	schedule_work(&sysrq_tlbdump);#endif} static const struct sysrq_key_op sysrq_tlbdump_op = {	.handler        = sysrq_handle_tlbdump,	.help_msg       = "show-tlbs(x)",	.action_msg     = "Show TLB entries",	.enable_mask	= SYSRQ_ENABLE_DUMP,}; static int __init mips_sysrq_init(void){	return register_sysrq_key('x', &sysrq_tlbdump_op);}arch_initcall(mips_sysrq_init);