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 
trace_s390_diagnose_norecursion(int diag_nr)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