1 /* Copyright 2013-2014 IBM Corp. 2 * 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 12 * implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef __TRACE_H 18 #define __TRACE_H 19 #include <ccan/short_types/short_types.h> 20 #include <stddef.h> 21 #include <lock.h> 22 #include <trace_types.h> 23 24 25 struct cpu_thread; 26 27 /* Here's one we prepared earlier. */ 28 void init_boot_tracebuf(struct cpu_thread *boot_cpu); 29 30 struct trace_info { 31 /* Lock for writers. Exposed to kernel. */ 32 struct lock lock; 33 /* Exposed to kernel. */ 34 struct tracebuf tb; 35 }; 36 37 #define TBUF_SZ ((1024 * 1024) - sizeof(struct trace_info) - sizeof(union trace)) 38 39 /* Allocate trace buffers once we know memory topology */ 40 void init_trace_buffers(void); 41 42 /* This will fill in timestamp and cpu; you must do type and len. */ 43 void trace_add(union trace *trace, u8 type, u16 len); 44 45 /* Put trace node into dt. */ 46 void trace_add_node(void); 47 #endif /* __TRACE_H */ 48