cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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sysrq.c (1366B)

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