LXR linux/arch/mips/kernel/sysrq.c

   1/*
   2 * MIPS specific sysrq operations.
   3 *
   4 * Copyright (C) 2015 Imagination Technologies Ltd.
   5 */
   6#include <linux/init.h>
   7#include <linux/smp.h>
   8#include <linux/spinlock.h>
   9#include <linux/sysrq.h>
  10#include <linux/workqueue.h>
  11
  12#include <asm/cpu-features.h>
  13#include <asm/mipsregs.h>
  14#include <asm/tlbdebug.h>
  15
  16/*
  17 * Dump TLB entries on all CPUs.
  18 */
  19
  20static DEFINE_SPINLOCK(show_lock);
  21
  22static void sysrq_tlbdump_single(void *dummy)
  23{
  24        unsigned long flags;
  25
  26        spin_lock_irqsave(&show_lock, flags);
  27
  28        pr_info("CPU%d:\n", smp_processor_id());
  29        dump_tlb_regs();
  30        pr_info("\n");
  31        dump_tlb_all();
  32        pr_info("\n");
  33
  34        spin_unlock_irqrestore(&show_lock, flags);
  35}
  36
  37#ifdef CONFIG_SMP
  38static void sysrq_tlbdump_othercpus(struct work_struct *dummy)
  39{
  40        smp_call_function(sysrq_tlbdump_single, NULL, 0);
  41}
  42
  43static DECLARE_WORK(sysrq_tlbdump, sysrq_tlbdump_othercpus);
  44#endif
  45
  46static void sysrq_handle_tlbdump(int key)
  47{
  48        sysrq_tlbdump_single(NULL);
  49#ifdef CONFIG_SMP
  50        schedule_work(&sysrq_tlbdump);
  51#endif
  52}
  53
  54static struct sysrq_key_op sysrq_tlbdump_op = {
  55        .handler        = sysrq_handle_tlbdump,
  56        .help_msg       = "show-tlbs(x)",
  57        .action_msg     = "Show TLB entries",
  58        .enable_mask    = SYSRQ_ENABLE_DUMP,
  59};
  60
  61static int __init mips_sysrq_init(void)
  62{
  63        return register_sysrq_key('x', &sysrq_tlbdump_op);
  64}
  65arch_initcall(mips_sysrq_init);
  66