2 * Copyright (c) 2012 The Chromium OS Authors.
4 * SPDX-License-Identifier: GPL-2.0+
11 #include <asm/sections.h>
13 DECLARE_GLOBAL_DATA_PTR
;
15 static char trace_enabled
__attribute__((section(".data")));
16 static char trace_inited
__attribute__((section(".data")));
18 /* The header block at the start of the trace memory area */
20 int func_count
; /* Total number of function call sites */
21 u64 call_count
; /* Total number of tracked function calls */
22 u64 untracked_count
; /* Total number of untracked function calls */
23 int funcs_used
; /* Total number of functions used */
26 * Call count for each function. This is indexed by the word offset
27 * of the function from gd->relocaddr
29 uintptr_t *call_accum
;
31 /* Function trace list */
32 struct trace_call
*ftrace
; /* The function call records */
33 ulong ftrace_size
; /* Num. of ftrace records we have space for */
34 ulong ftrace_count
; /* Num. of ftrace records written */
35 ulong ftrace_too_deep_count
; /* Functions that were too deep */
42 static struct trace_hdr
*hdr
; /* Pointer to start of trace buffer */
44 static inline uintptr_t __attribute__((no_instrument_function
))
45 func_ptr_to_num(void *func_ptr
)
47 uintptr_t offset
= (uintptr_t)func_ptr
;
50 offset
-= (uintptr_t)&_init
;
52 if (gd
->flags
& GD_FLG_RELOC
)
53 offset
-= gd
->relocaddr
;
55 offset
-= CONFIG_SYS_TEXT_BASE
;
57 return offset
/ FUNC_SITE_SIZE
;
60 static void __attribute__((no_instrument_function
)) add_ftrace(void *func_ptr
,
61 void *caller
, ulong flags
)
63 if (hdr
->depth
> hdr
->depth_limit
) {
64 hdr
->ftrace_too_deep_count
++;
67 if (hdr
->ftrace_count
< hdr
->ftrace_size
) {
68 struct trace_call
*rec
= &hdr
->ftrace
[hdr
->ftrace_count
];
70 rec
->func
= func_ptr_to_num(func_ptr
);
71 rec
->caller
= func_ptr_to_num(caller
);
72 rec
->flags
= flags
| (timer_get_us() & FUNCF_TIMESTAMP_MASK
);
77 static void __attribute__((no_instrument_function
)) add_textbase(void)
79 if (hdr
->ftrace_count
< hdr
->ftrace_size
) {
80 struct trace_call
*rec
= &hdr
->ftrace
[hdr
->ftrace_count
];
82 rec
->func
= CONFIG_SYS_TEXT_BASE
;
84 rec
->flags
= FUNCF_TEXTBASE
;
90 * This is called on every function entry
92 * We add to our tally for this function and add to the list of called
95 * @param func_ptr Pointer to function being entered
96 * @param caller Pointer to function which called this function
98 void __attribute__((no_instrument_function
)) __cyg_profile_func_enter(
99 void *func_ptr
, void *caller
)
104 add_ftrace(func_ptr
, caller
, FUNCF_ENTRY
);
105 func
= func_ptr_to_num(func_ptr
);
106 if (func
< hdr
->func_count
) {
107 hdr
->call_accum
[func
]++;
110 hdr
->untracked_count
++;
113 if (hdr
->depth
> hdr
->depth_limit
)
114 hdr
->max_depth
= hdr
->depth
;
119 * This is called on every function exit
121 * We do nothing here.
123 * @param func_ptr Pointer to function being entered
124 * @param caller Pointer to function which called this function
126 void __attribute__((no_instrument_function
)) __cyg_profile_func_exit(
127 void *func_ptr
, void *caller
)
130 add_ftrace(func_ptr
, caller
, FUNCF_EXIT
);
136 * Produce a list of called functions
138 * The information is written into the supplied buffer - a header followed
139 * by a list of function records.
141 * @param buff Buffer to place list into
142 * @param buff_size Size of buffer
143 * @param needed Returns size of buffer needed, which may be
144 * greater than buff_size if we ran out of space.
145 * @return 0 if ok, -1 if space was exhausted
147 int trace_list_functions(void *buff
, int buff_size
, unsigned int *needed
)
149 struct trace_output_hdr
*output_hdr
= NULL
;
150 void *end
, *ptr
= buff
;
154 end
= buff
? buff
+ buff_size
: NULL
;
156 /* Place some header information */
157 if (ptr
+ sizeof(struct trace_output_hdr
) < end
)
159 ptr
+= sizeof(struct trace_output_hdr
);
161 /* Add information about each function */
162 for (func
= upto
= 0; func
< hdr
->func_count
; func
++) {
163 int calls
= hdr
->call_accum
[func
];
168 if (ptr
+ sizeof(struct trace_output_func
) < end
) {
169 struct trace_output_func
*stats
= ptr
;
171 stats
->offset
= func
* FUNC_SITE_SIZE
;
172 stats
->call_count
= calls
;
175 ptr
+= sizeof(struct trace_output_func
);
178 /* Update the header */
180 output_hdr
->rec_count
= upto
;
181 output_hdr
->type
= TRACE_CHUNK_FUNCS
;
184 /* Work out how must of the buffer we used */
185 *needed
= ptr
- buff
;
191 int trace_list_calls(void *buff
, int buff_size
, unsigned *needed
)
193 struct trace_output_hdr
*output_hdr
= NULL
;
194 void *end
, *ptr
= buff
;
198 end
= buff
? buff
+ buff_size
: NULL
;
200 /* Place some header information */
201 if (ptr
+ sizeof(struct trace_output_hdr
) < end
)
203 ptr
+= sizeof(struct trace_output_hdr
);
205 /* Add information about each call */
206 count
= hdr
->ftrace_count
;
207 if (count
> hdr
->ftrace_size
)
208 count
= hdr
->ftrace_size
;
209 for (rec
= upto
= 0; rec
< count
; rec
++) {
210 if (ptr
+ sizeof(struct trace_call
) < end
) {
211 struct trace_call
*call
= &hdr
->ftrace
[rec
];
212 struct trace_call
*out
= ptr
;
214 out
->func
= call
->func
* FUNC_SITE_SIZE
;
215 out
->caller
= call
->caller
* FUNC_SITE_SIZE
;
216 out
->flags
= call
->flags
;
219 ptr
+= sizeof(struct trace_call
);
222 /* Update the header */
224 output_hdr
->rec_count
= upto
;
225 output_hdr
->type
= TRACE_CHUNK_CALLS
;
228 /* Work out how must of the buffer we used */
229 *needed
= ptr
- buff
;
235 /* Print basic information about tracing */
236 void trace_print_stats(void)
241 puts("Warning: make U-Boot with FTRACE to enable function instrumenting.\n");
242 puts("You will likely get zeroed data here\n");
245 printf("Trace is disabled\n");
248 print_grouped_ull(hdr
->func_count
, 10);
249 puts(" function sites\n");
250 print_grouped_ull(hdr
->call_count
, 10);
251 puts(" function calls\n");
252 print_grouped_ull(hdr
->untracked_count
, 10);
253 puts(" untracked function calls\n");
254 count
= min(hdr
->ftrace_count
, hdr
->ftrace_size
);
255 print_grouped_ull(count
, 10);
256 puts(" traced function calls");
257 if (hdr
->ftrace_count
> hdr
->ftrace_size
) {
258 printf(" (%lu dropped due to overflow)",
259 hdr
->ftrace_count
- hdr
->ftrace_size
);
262 printf("%15d maximum observed call depth\n", hdr
->max_depth
);
263 printf("%15d call depth limit\n", hdr
->depth_limit
);
264 print_grouped_ull(hdr
->ftrace_too_deep_count
, 10);
265 puts(" calls not traced due to depth\n");
268 void __attribute__((no_instrument_function
)) trace_set_enabled(int enabled
)
270 trace_enabled
= enabled
!= 0;
274 * Init the tracing system ready for used, and enable it
276 * @param buff Pointer to trace buffer
277 * @param buff_size Size of trace buffer
279 int __attribute__((no_instrument_function
)) trace_init(void *buff
,
282 ulong func_count
= gd
->mon_len
/ FUNC_SITE_SIZE
;
284 int was_disabled
= !trace_enabled
;
287 #ifdef CONFIG_TRACE_EARLY
292 * Copy over the early trace data if we have it. Disable
293 * tracing while we are doing this.
296 hdr
= map_sysmem(CONFIG_TRACE_EARLY_ADDR
,
297 CONFIG_TRACE_EARLY_SIZE
);
298 end
= (char *)&hdr
->ftrace
[hdr
->ftrace_count
];
299 used
= end
- (char *)hdr
;
300 printf("trace: copying %08lx bytes of early data from %x to %08lx\n",
301 used
, CONFIG_TRACE_EARLY_ADDR
,
302 (ulong
)map_to_sysmem(buff
));
303 memcpy(buff
, hdr
, used
);
305 puts("trace: already enabled\n");
309 hdr
= (struct trace_hdr
*)buff
;
310 needed
= sizeof(*hdr
) + func_count
* sizeof(uintptr_t);
311 if (needed
> buff_size
) {
312 printf("trace: buffer size %zd bytes: at least %zd needed\n",
318 memset(hdr
, '\0', needed
);
319 hdr
->func_count
= func_count
;
320 hdr
->call_accum
= (uintptr_t *)(hdr
+ 1);
322 /* Use any remaining space for the timed function trace */
323 hdr
->ftrace
= (struct trace_call
*)(buff
+ needed
);
324 hdr
->ftrace_size
= (buff_size
- needed
) / sizeof(*hdr
->ftrace
);
327 puts("trace: enabled\n");
328 hdr
->depth_limit
= 15;
334 #ifdef CONFIG_TRACE_EARLY
335 int __attribute__((no_instrument_function
)) trace_early_init(void)
337 ulong func_count
= gd
->mon_len
/ FUNC_SITE_SIZE
;
338 size_t buff_size
= CONFIG_TRACE_EARLY_SIZE
;
341 /* We can ignore additional calls to this function */
345 hdr
= map_sysmem(CONFIG_TRACE_EARLY_ADDR
, CONFIG_TRACE_EARLY_SIZE
);
346 needed
= sizeof(*hdr
) + func_count
* sizeof(uintptr_t);
347 if (needed
> buff_size
) {
348 printf("trace: buffer size is %zd bytes, at least %zd needed\n",
353 memset(hdr
, '\0', needed
);
354 hdr
->call_accum
= (uintptr_t *)(hdr
+ 1);
355 hdr
->func_count
= func_count
;
357 /* Use any remaining space for the timed function trace */
358 hdr
->ftrace
= (struct trace_call
*)((char *)hdr
+ needed
);
359 hdr
->ftrace_size
= (buff_size
- needed
) / sizeof(*hdr
->ftrace
);
361 hdr
->depth_limit
= 200;
362 printf("trace: early enable at %08x\n", CONFIG_TRACE_EARLY_ADDR
);