From 56144ec7c93f6f18aa878560074633ac3ad16896 Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Fri, 6 Nov 2015 13:21:17 +1100 Subject: [PATCH] powerpc/xmon: Add 'dt' command to dump trace buffers There is a nice interface for asking ftrace to dump all its tracing buffers. The only down side for use in xmon is that it uses printk. Depending on circumstances printk may not work when in xmon, but it also may, so add a 'dt' command which dumps the ftrace buffers, and add a note to the help to mentiont that it uses printk. Calling this routine also disables tracing, which is problematic if you return from xmon and expect the system to keep operating normally. So after we do the dump turn tracing back on. Both functions already have nop versions defined for when ftrace is not enabled, so we don't need any extra #ifdefs. Signed-off-by: Michael Ellerman --- arch/powerpc/xmon/xmon.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c index 760545519a0b..9c0e17cf6886 100644 --- a/arch/powerpc/xmon/xmon.c +++ b/arch/powerpc/xmon/xmon.c @@ -10,6 +10,8 @@ * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ + +#include #include #include #include @@ -225,6 +227,7 @@ Commands:\n\ #endif "\ dr dump stream of raw bytes\n\ + dt dump the tracing buffers (uses printk)\n\ e print exception information\n\ f flush cache\n\ la lookup symbol+offset of specified address\n\ @@ -2364,6 +2367,9 @@ 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)