On Fri, 13 Dec 2024 at 14:46, Jerome Forissier <[email protected]> wrote: > > 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 <[email protected]> > --- > cmd/trace.c | 5 +++++ > include/trace.h | 2 ++ > lib/trace.c | 47 +++++++++++++++++++++++++++++++++-------------- > 3 files changed, 40 insertions(+), 14 deletions(-) > > diff --git a/cmd/trace.c b/cmd/trace.c > index 937e6a682ad..d36008720db 100644 > --- a/cmd/trace.c > +++ b/cmd/trace.c > @@ -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" > diff --git a/include/trace.h b/include/trace.h > index 763d6d1255a..782eaae2fc2 100644 > --- a/include/trace.h > +++ b/include/trace.h > @@ -100,6 +100,8 @@ void trace_set_enabled(int enabled); > > int trace_early_init(void); > > +int trace_clear(void); > + > /** > * Init the trace system > * > 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 > -- > 2.43.0 >
Reviewed-by: Ilias Apalodimas <[email protected]>
