tracing/function: Introduce persistent trace option

This patch introduces 'func_ptrace' option, now available in
/sys/kernel/debug/tracing/options when function tracer
is selected.

The patch also adds some tiny code that calls back to pstore
to record the trace. The callback is no-op when PSTORE=n.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 20 insertions, 5 deletions

diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index c7b0c6a7db09..13770abd7a12 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -13,6 +13,7 @@
 #include <linux/debugfs.h>
 #include <linux/uaccess.h>
 #include <linux/ftrace.h>
+#include <linux/pstore.h>
 #include <linux/fs.h>
 
 #include "trace.h"
@@ -74,6 +75,14 @@ function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip)
         preempt_enable_notrace();
 }
 
+/* Our two options */
+enum {
+        TRACE_FUNC_OPT_STACK    = 0x1,
+        TRACE_FUNC_OPT_PSTORE   = 0x2,
+};
+
+static struct tracer_flags func_flags;
+
 static void
 function_trace_call(unsigned long ip, unsigned long parent_ip)
 {
@@ -97,6 +106,12 @@ function_trace_call(unsigned long ip, unsigned long parent_ip)
         disabled = atomic_inc_return(&data->disabled);
 
         if (likely(disabled == 1)) {
+                /*
+                 * So far tracing doesn't support multiple buffers, so
+                 * we make an explicit call for now.
+                 */
+                if (unlikely(func_flags.val & TRACE_FUNC_OPT_PSTORE))
+                        pstore_ftrace_call(ip, parent_ip);
                 pc = preempt_count();
                 trace_function(tr, ip, parent_ip, flags, pc);
         }
@@ -158,15 +173,13 @@ static struct ftrace_ops trace_stack_ops __read_mostly =
         .flags = FTRACE_OPS_FL_GLOBAL,
 };
 
-/* Our two options */
-enum {
-        TRACE_FUNC_OPT_STACK = 0x1,
-};
-
 static struct tracer_opt func_opts[] = {
 #ifdef CONFIG_STACKTRACE
         { TRACER_OPT(func_stack_trace, TRACE_FUNC_OPT_STACK) },
 #endif
+#ifdef CONFIG_PSTORE_FTRACE
+        { TRACER_OPT(func_pstore, TRACE_FUNC_OPT_PSTORE) },
+#endif
         { } /* Always set a last empty entry */
 };
 
@@ -218,6 +231,8 @@ static int func_set_flag(u32 old_flags, u32 bit, int set)
                 }
 
                 return 0;
+        } else if (bit == TRACE_FUNC_OPT_PSTORE) {
+                return 0;
         }
 
         return -EINVAL;