sysrq.c 1.3 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * MIPS specific sysrq operations.
  4. *
  5. * Copyright (C) 2015 Imagination Technologies Ltd.
  6. */
  7. #include <linux/init.h>
  8. #include <linux/smp.h>
  9. #include <linux/spinlock.h>
  10. #include <linux/sysrq.h>
  11. #include <linux/workqueue.h>
  12. #include <asm/cpu-features.h>
  13. #include <asm/mipsregs.h>
  14. #include <asm/tlbdebug.h>
  15. /*
  16. * Dump TLB entries on all CPUs.
  17. */
  18. static DEFINE_SPINLOCK(show_lock);
  19. static void sysrq_tlbdump_single(void *dummy)
  20. {
  21. unsigned long flags;
  22. spin_lock_irqsave(&show_lock, flags);
  23. pr_info("CPU%d:\n", smp_processor_id());
  24. dump_tlb_regs();
  25. pr_info("\n");
  26. dump_tlb_all();
  27. pr_info("\n");
  28. spin_unlock_irqrestore(&show_lock, flags);
  29. }
  30. #ifdef CONFIG_SMP
  31. static void sysrq_tlbdump_othercpus(struct work_struct *dummy)
  32. {
  33. smp_call_function(sysrq_tlbdump_single, NULL, 0);
  34. }
  35. static DECLARE_WORK(sysrq_tlbdump, sysrq_tlbdump_othercpus);
  36. #endif
  37. static void sysrq_handle_tlbdump(int key)
  38. {
  39. sysrq_tlbdump_single(NULL);
  40. #ifdef CONFIG_SMP
  41. schedule_work(&sysrq_tlbdump);
  42. #endif
  43. }
  44. static const struct sysrq_key_op sysrq_tlbdump_op = {
  45. .handler = sysrq_handle_tlbdump,
  46. .help_msg = "show-tlbs(x)",
  47. .action_msg = "Show TLB entries",
  48. .enable_mask = SYSRQ_ENABLE_DUMP,
  49. };
  50. static int __init mips_sysrq_init(void)
  51. {
  52. return register_sysrq_key('x', &sysrq_tlbdump_op);
  53. }
  54. arch_initcall(mips_sysrq_init);