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authorMichael Ellerman <mpe@ellerman.id.au>2015-11-06 13:21:17 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2016-11-25 14:30:27 +1100
commit56144ec7c93f6f18aa878560074633ac3ad16896 (patch)
tree09ac60d4798d3f2cc06b9f7ea0c15a69f35d0c00
parentebb242d56bbe14af6ea25cf5e45440df4c26b4b1 (diff)
downloadop-kernel-dev-56144ec7c93f6f18aa878560074633ac3ad16896.zip
op-kernel-dev-56144ec7c93f6f18aa878560074633ac3ad16896.tar.gz
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 <mpe@ellerman.id.au>
-rw-r--r--arch/powerpc/xmon/xmon.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 7605455..9c0e17c 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 <linux/kernel.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/smp.h>
@@ -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)
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