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
13 EXPORT_TRACEPOINT_SYMBOL(s390_diagnose);
14
15 static DEFINE_PER_CPU(unsigned int, diagnose_trace_depth);
16
17 void 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 }
34
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