17 	struct trace_buffer *tb;  in trace_buffer_allocate()  local
19 	if (size < sizeof(*tb)) {  in trace_buffer_allocate()
24 	tb = mmap(NULL, size, PROT_READ | PROT_WRITE,  in trace_buffer_allocate()
26 	if (tb == MAP_FAILED) {  in trace_buffer_allocate()
31 	tb->size = size;  in trace_buffer_allocate()
32 	tb->tail = tb->data;  in trace_buffer_allocate()
33 	tb->overflow = false;  in trace_buffer_allocate()
35 	return tb;  in trace_buffer_allocate()
38 static bool trace_check_bounds(struct trace_buffer *tb, void *p)  in trace_check_bounds()  argument
40 	return p < ((void *)tb + tb->size);  in trace_check_bounds()
43 static bool trace_check_alloc(struct trace_buffer *tb, void *p)  in trace_check_alloc()  argument
51 	if (tb->overflow)  in trace_check_alloc()
54 	if (!trace_check_bounds(tb, p)) {  in trace_check_alloc()
55 		tb->overflow = true;  in trace_check_alloc()
62 static void *trace_alloc(struct trace_buffer *tb, int bytes)  in trace_alloc()  argument
66 	p = tb->tail;  in trace_alloc()
67 	newtail = tb->tail + bytes;  in trace_alloc()
68 	if (!trace_check_alloc(tb, newtail))  in trace_alloc()
71 	tb->tail = newtail;  in trace_alloc()
76 static struct trace_entry *trace_alloc_entry(struct trace_buffer *tb, int payload_size)  in trace_alloc_entry()  argument
80 	e = trace_alloc(tb, sizeof(*e) + payload_size);  in trace_alloc_entry()
87 int trace_log_reg(struct trace_buffer *tb, u64 reg, u64 value)  in trace_log_reg()  argument
92 	e = trace_alloc_entry(tb, sizeof(reg) + sizeof(value));  in trace_log_reg()
104 int trace_log_counter(struct trace_buffer *tb, u64 value)  in trace_log_counter()  argument
109 	e = trace_alloc_entry(tb, sizeof(value));  in trace_log_counter()
120 int trace_log_string(struct trace_buffer *tb, char *str)  in trace_log_string()  argument
129 	e = trace_alloc_entry(tb, len + 1);  in trace_log_string()
142 int trace_log_indent(struct trace_buffer *tb)  in trace_log_indent()  argument
146 	e = trace_alloc_entry(tb, 0);  in trace_log_indent()
155 int trace_log_outdent(struct trace_buffer *tb)  in trace_log_outdent()  argument
159 	e = trace_alloc_entry(tb, 0);  in trace_log_outdent()
269 void trace_buffer_print(struct trace_buffer *tb)  in trace_buffer_print()  argument
276 	printf("  address  %p \n", tb);  in trace_buffer_print()
277 	printf("  tail     %p\n", tb->tail);  in trace_buffer_print()
278 	printf("  size     %llu\n", tb->size);  in trace_buffer_print()
279 	printf("  overflow %s\n", tb->overflow ? "TRUE" : "false");  in trace_buffer_print()
282 	p = tb->data;  in trace_buffer_print()
287 	while (trace_check_bounds(tb, p) && p < tb->tail) {  in trace_buffer_print()
297 void trace_print_location(struct trace_buffer *tb)  in trace_print_location()  argument
299 	printf("Trace buffer 0x%llx bytes @ %p\n", tb->size, tb);  in trace_print_location()