/* * 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_SMP static 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(int key) { sysrq_tlbdump_single(NULL); #ifdef CONFIG_SMP schedule_work(&sysrq_tlbdump); #endif } static 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);