[U-Boot] [PATCH 1/1] trace: make call depth limit customizable

[Heinrich Schuchardt]

Up to now we had hard coded values for the call depth up to which trace
records are created: 200 for early tracing, 15 thereafter. UEFI
applications reach a call depth of 80 or above.

Provide customizing settings for the call trace depth limit and the early
call trace depth limit. Use the old values as defaults.

Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
 lib/Kconfig | 15 +++++++++++++++
 lib/trace.c |  4 ++--
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/lib/Kconfig b/lib/Kconfig
index 416e63c1c7..e717eb3de5 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -192,6 +192,13 @@ config TRACE_BUFFER_SIZE
 	  the size is too small then 'trace stats' will show a message saying
 	  how many records were dropped due to buffer overflow.

+config TRACE_CALL_DEPTH_LIMIT
+	int "Trace call depth limit"
+	depends on TRACE
+	default 15
+	help
+	  Sets the maximum call depth up to which function calls are recorded.
+
 config TRACE_EARLY
 	bool "Enable tracing before relocation"
 	depends on TRACE
@@ -209,6 +216,14 @@ config TRACE_EARLY_SIZE
 	  Sets the size of the early trace buffer in bytes. This is used to hold
 	  tracing information before relocation.

+config TRACE_EARLY_CALL_DEPTH_LIMIT
+	int "Early trace call depth limit"
+	depends on TRACE_EARLY
+	default 200
+	help
+	  Sets the maximum call depth up to which function calls are recorded
+	  during early tracing.
+
 config TRACE_EARLY_ADDR
 	hex "Address of early trace buffer in U-Boot"
 	depends on TRACE_EARLY
diff --git a/lib/trace.c b/lib/trace.c
index a13e5bf228..04780f59d3 100644
--- a/lib/trace.c
+++ b/lib/trace.c
@@ -376,7 +376,7 @@ int __attribute__((no_instrument_function)) trace_init(void *buff,
 	add_textbase();

 	puts("trace: enabled\n");
-	hdr->depth_limit = 15;
+	hdr->depth_limit = CONFIG_TRACE_CALL_DEPTH_LIMIT;
 	trace_enabled = 1;
 	trace_inited = 1;

@@ -410,7 +410,7 @@ int __attribute__((no_instrument_function)) trace_early_init(void)
 	hdr->ftrace = (struct trace_call *)((char *)hdr + needed);
 	hdr->ftrace_size = (buff_size - needed) / sizeof(*hdr->ftrace);
 	add_textbase();
-	hdr->depth_limit = 200;
+	hdr->depth_limit = CONFIG_TRACE_EARLY_CALL_DEPTH_LIMIT;
 	printf("trace: early enable at %08x\n", CONFIG_TRACE_EARLY_ADDR);

 	trace_enabled = 1;
--
2.20.1