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trace: add support for 'trace wipe'

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Implement a 'trace wipe' command to delete the currently accumulated
trace data. This comes handy when someone needs to trace a particular
command. For example:

  => trace pause; trace wipe
  => trace resume; dhcp; trace pause
  => trace stats
  => trace calls 0x02100000 0x10000000
  => tftpput $profbase $profoffset 192.168.0.16:trace.bin

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Jerome Forissier 2024-12-13 13:45:36 +01:00 • committed by Tom Rini
parent c3c20a5e3c
commit 60a684e0a9
3 changed files with 40 additions and 14 deletions
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5
cmd/trace.c
View file

@ -100,6 +100,10 @@ int do_trace(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
case 's':
trace_print_stats();
break;
case 'w':
if (trace_wipe())
return CMD_RET_FAILURE;
break;
default:
return CMD_RET_USAGE;
}
@ -113,6 +117,7 @@ U_BOOT_CMD(
"stats - display tracing statistics\n"
"trace pause - pause tracing\n"
"trace resume - resume tracing\n"
"trace wipe - wipe traces\n"
"trace funclist [<addr> <size>] - dump function list into buffer\n"
"trace calls [<addr> <size>] "
"- dump function call trace into buffer"

2
include/trace.h
View file

@ -100,6 +100,8 @@ void trace_set_enabled(int enabled);
int trace_early_init(void);
int trace_clear(void);
/**
* Init the trace system
*

47
lib/trace.c
View file

@ -351,14 +351,8 @@ static int get_func_count(void)
return gd->mon_len / FUNC_SITE_SIZE;
}
/**
* trace_init() - initialize the tracing system and enable it
*
* @buff: Pointer to trace buffer
* @buff_size: Size of trace buffer
* Return: 0 if ok
*/
int notrace trace_init(void *buff, size_t buff_size)
static int notrace trace_init_(void *buff, size_t buff_size, bool copy_early,
bool enable)
{
int func_count = get_func_count();
size_t needed;
@ -368,7 +362,7 @@ int notrace trace_init(void *buff, size_t buff_size)
return func_count;
trace_save_gd();
if (!was_disabled) {
if (copy_early) {
#ifdef CONFIG_TRACE_EARLY
ulong used, count;
char *end;
@ -394,9 +388,6 @@ int notrace trace_init(void *buff, size_t buff_size)
}
puts("\n");
memcpy(buff, hdr, used);
#else
puts("trace: already enabled\n");
return -EALREADY;
#endif
}
hdr = (struct trace_hdr *)buff;
@ -419,13 +410,41 @@ int notrace trace_init(void *buff, size_t buff_size)
hdr->ftrace_size = (buff_size - needed) / sizeof(*hdr->ftrace);
hdr->depth_limit = CONFIG_TRACE_CALL_DEPTH_LIMIT;
puts("trace: enabled\n");
trace_enabled = 1;
printf("trace: initialized, %senabled\n", enable ? "" : "not ");
trace_enabled = enable;
trace_inited = 1;
return 0;
}
/**
* trace_init() - initialize the tracing system and enable it
*
* @buff: Pointer to trace buffer
* @buff_size: Size of trace buffer
* Return: 0 if ok
*/
int notrace trace_init(void *buff, size_t buff_size)
{
/* If traces are enabled already, we may have early traces to copy */
return trace_init_(buff, buff_size, trace_enabled, true);
}
/**
* trace_clear() - clear accumulated traced data
*
* May be called with tracing enabled or disabled.
*/
int notrace trace_clear(void)
{
bool was_enabled = trace_enabled;
if (trace_enabled)
trace_enabled = 0;
return trace_init_(gd->trace_buff, CONFIG_TRACE_BUFFER_SIZE,
false, was_enabled);
}
#ifdef CONFIG_TRACE_EARLY
/**
* trace_early_init() - initialize the tracing system for early tracing