| 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 |