diff options
| author | Jerome Forissier <jerome.forissier@linaro.org> | 2024-12-13 13:45:36 +0100 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2024-12-31 19:00:46 -0600 |
| commit | 60a684e0a9f341d96c30ce0e1e472d7a203c85aa (patch) | |
| tree | 601b5741220ea12963a8af890c7c8984caeb0206 /lib/trace.c | |
| parent | c3c20a5e3c04c7c9e0866812f6b615ec15af06d9 (diff) | |
trace: add support for 'trace wipe'
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>
Diffstat (limited to 'lib/trace.c')
| -rw-r--r-- | lib/trace.c | 47 |
1 files changed, 33 insertions, 14 deletions
diff --git a/lib/trace.c b/lib/trace.c index cabbe47b58a..def9f912c92 100644 --- a/lib/trace.c +++ b/lib/trace.c @@ -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 |