1b5a6b71bSMartin Schwidefsky /* 2b5a6b71bSMartin Schwidefsky * Tracepoint definitions for s390 3b5a6b71bSMartin Schwidefsky * 4b5a6b71bSMartin Schwidefsky * Copyright IBM Corp. 2015 5b5a6b71bSMartin Schwidefsky * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> 6b5a6b71bSMartin Schwidefsky */ 7b5a6b71bSMartin Schwidefsky 8b5a6b71bSMartin Schwidefsky #include <linux/percpu.h> 9b5a6b71bSMartin Schwidefsky #define CREATE_TRACE_POINTS 10b5a6b71bSMartin Schwidefsky #include <asm/trace/diag.h> 11b5a6b71bSMartin Schwidefsky 12230ccb37SMartin Schwidefsky EXPORT_TRACEPOINT_SYMBOL(s390_diagnose); 13b5a6b71bSMartin Schwidefsky 14b5a6b71bSMartin Schwidefsky static DEFINE_PER_CPU(unsigned int, diagnose_trace_depth); 15b5a6b71bSMartin Schwidefsky 16230ccb37SMartin Schwidefsky void trace_s390_diagnose_norecursion(int diag_nr) 17b5a6b71bSMartin Schwidefsky { 18b5a6b71bSMartin Schwidefsky unsigned long flags; 19b5a6b71bSMartin Schwidefsky unsigned int *depth; 20b5a6b71bSMartin Schwidefsky 21*f6c9b160SHeiko Carstens /* Avoid lockdep recursion. */ 22*f6c9b160SHeiko Carstens if (IS_ENABLED(CONFIG_LOCKDEP)) 23*f6c9b160SHeiko Carstens return; 24b5a6b71bSMartin Schwidefsky local_irq_save(flags); 25b5a6b71bSMartin Schwidefsky depth = this_cpu_ptr(&diagnose_trace_depth); 26b5a6b71bSMartin Schwidefsky if (*depth == 0) { 27b5a6b71bSMartin Schwidefsky (*depth)++; 28230ccb37SMartin Schwidefsky trace_s390_diagnose(diag_nr); 29b5a6b71bSMartin Schwidefsky (*depth)--; 30b5a6b71bSMartin Schwidefsky } 31b5a6b71bSMartin Schwidefsky local_irq_restore(flags); 32b5a6b71bSMartin Schwidefsky } 33