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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
b5a6b71b MS |
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 | ||
230ccb37 | 13 | EXPORT_TRACEPOINT_SYMBOL(s390_diagnose); |
b5a6b71b MS |
14 | |
15 | static DEFINE_PER_CPU(unsigned int, diagnose_trace_depth); | |
16 | ||
230ccb37 | 17 | void trace_s390_diagnose_norecursion(int diag_nr) |
b5a6b71b MS |
18 | { |
19 | unsigned long flags; | |
20 | unsigned int *depth; | |
21 | ||
f6c9b160 HC |
22 | /* Avoid lockdep recursion. */ |
23 | if (IS_ENABLED(CONFIG_LOCKDEP)) | |
24 | return; | |
b5a6b71b MS |
25 | local_irq_save(flags); |
26 | depth = this_cpu_ptr(&diagnose_trace_depth); | |
27 | if (*depth == 0) { | |
28 | (*depth)++; | |
230ccb37 | 29 | trace_s390_diagnose(diag_nr); |
b5a6b71b MS |
30 | (*depth)--; |
31 | } | |
32 | local_irq_restore(flags); | |
33 | } |