From 264040485a197271a5a4ad03187dc4f1b879196d Mon Sep 17 00:00:00 2001 From: Breno Leitao Date: Wed, 2 Aug 2017 17:14:05 -0300 Subject: [PATCH] powerpc/xmon: Dump ftrace buffers for the current CPU only Current xmon 'dt' command dumps the tracing buffer for all the CPUs, which makes it very hard to read due to the fact that most of powerpc machines currently have many CPUs. Other than that, the CPU lines are interleaved in the ftrace log. This new option just dumps the ftrace buffer for the current CPU. Signed-off-by: Breno Leitao Acked-by: Naveen N. Rao Signed-off-by: Michael Ellerman --- arch/powerpc/xmon/xmon.c | 22 +++++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c index 08e367e3e8c31..e0522f60f0eeb 100644 --- a/arch/powerpc/xmon/xmon.c +++ b/arch/powerpc/xmon/xmon.c @@ -234,6 +234,7 @@ Commands:\n\ "\ dr dump stream of raw bytes\n\ dt dump the tracing buffers (uses printk)\n\ + dtc dump the tracing buffers for current CPU (uses printk)\n\ " #ifdef CONFIG_PPC_POWERNV " dx# dump xive on CPU #\n\ @@ -2231,6 +2232,19 @@ static void xmon_rawdump (unsigned long adrs, long ndump) printf("\n"); } +static void dump_tracing(void) +{ + int c; + + c = inchar(); + if (c == 'c') + ftrace_dump(DUMP_ORIG); + else + ftrace_dump(DUMP_ALL); + + tracing_on(); +} + #ifdef CONFIG_PPC64 static void dump_one_paca(int cpu) { @@ -2507,6 +2521,11 @@ dump(void) } #endif + if (c == 't') { + dump_tracing(); + return; + } + if (c == '\n') termch = c; @@ -2525,9 +2544,6 @@ dump(void) dump_log_buf(); } else if (c == 'o') { dump_opal_msglog(); - } else if (c == 't') { - ftrace_dump(DUMP_ALL); - tracing_on(); } else if (c == 'r') { scanhex(&ndump); if (ndump == 0) -- 2.39.5