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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trace.c (715B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Tracepoint definitions for s390
      4 *
      5 * Copyright IBM Corp. 2015
      6 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
      7 */
      8
      9#include <linux/percpu.h>
     10#define CREATE_TRACE_POINTS
     11#include <asm/trace/diag.h>
     12
     13EXPORT_TRACEPOINT_SYMBOL(s390_diagnose);
     14
     15static DEFINE_PER_CPU(unsigned int, diagnose_trace_depth);
     16
     17void notrace trace_s390_diagnose_norecursion(int diag_nr)
     18{
     19	unsigned long flags;
     20	unsigned int *depth;
     21
     22	/* Avoid lockdep recursion. */
     23	if (IS_ENABLED(CONFIG_LOCKDEP))
     24		return;
     25	local_irq_save(flags);
     26	depth = this_cpu_ptr(&diagnose_trace_depth);
     27	if (*depth == 0) {
     28		(*depth)++;
     29		trace_s390_diagnose(diag_nr);
     30		(*depth)--;
     31	}
     32	local_irq_restore(flags);
     33}