Blackfin arch: Add ability to expend the hardware trace buffer
Add ability to expend the hardware trace buffer via a configurable
software buffer - so you can have lots of history when a crash occurs.
The interesting way we do printk in the traps.c confusese the checking
script
Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
diff --git a/include/asm-blackfin/trace.h b/include/asm-blackfin/trace.h
index 9c2474c..6313aac 100644
--- a/include/asm-blackfin/trace.h
+++ b/include/asm-blackfin/trace.h
@@ -6,23 +6,46 @@
#ifndef _BLACKFIN_TRACE_
#define _BLACKFIN_TRACE_
+/* Normally, we use ON, but you can't turn on software expansion until
+ * interrupts subsystem is ready
+ */
+
+#define BFIN_TRACE_INIT ((CONFIG_DEBUG_BFIN_HWTRACE_COMPRESSION << 4) | 0x03)
+#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
+#define BFIN_TRACE_ON (BFIN_TRACE_INIT | (CONFIG_DEBUG_BFIN_HWTRACE_EXPAND << 2))
+#else
+#define BFIN_TRACE_ON (BFIN_TRACE_INIT)
+#endif
+
#ifndef __ASSEMBLY__
+extern unsigned long trace_buff_offset;
+extern unsigned long software_trace_buff[];
+
/* Trace Macros for C files */
+#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
+
#define trace_buffer_save(x) \
- do { \
- (x) = bfin_read_TBUFCTL(); \
- bfin_write_TBUFCTL((x) & ~TBUFEN); \
- } while (0)
+ do { \
+ (x) = bfin_read_TBUFCTL(); \
+ bfin_write_TBUFCTL((x) & ~TBUFEN); \
+ } while (0)
#define trace_buffer_restore(x) \
- do { \
- bfin_write_TBUFCTL((x)); \
- } while (0)
+ do { \
+ bfin_write_TBUFCTL((x)); \
+ } while (0)
+#else /* DEBUG_BFIN_HWTRACE_ON */
+
+#define trace_buffer_save(x)
+#define trace_buffer_restore(x)
+#endif /* CONFIG_DEBUG_BFIN_HWTRACE_ON */
#else
/* Trace Macros for Assembly files */
+#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
+
#define TRACE_BUFFER_START(preg, dreg) trace_buffer_start(preg, dreg)
#define TRACE_BUFFER_STOP(preg, dreg) trace_buffer_stop(preg, dreg)
@@ -32,12 +55,26 @@
dreg = 0x1; \
[preg] = dreg;
-#define trace_buffer_start(preg, dreg) \
+#define trace_buffer_start(preg, dreg) \
preg.L = LO(TBUFCTL); \
preg.H = HI(TBUFCTL); \
- dreg = 0x13; \
+ dreg = BFIN_TRACE_ON; \
[preg] = dreg;
+#define trace_buffer_init(preg, dreg) \
+ preg.L = LO(TBUFCTL); \
+ preg.H = HI(TBUFCTL); \
+ dreg = BFIN_TRACE_INIT; \
+ [preg] = dreg;
+
+#else /* CONFIG_DEBUG_BFIN_HWTRACE_ON */
+
+#define trace_buffer_stop(preg, dreg)
+#define trace_buffer_start(preg, dreg)
+#define trace_buffer_init(preg, dreg)
+
+#endif /* CONFIG_DEBUG_BFIN_HWTRACE_ON */
+
#ifdef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
# define DEBUG_START_HWTRACE(preg, dreg) trace_buffer_start(preg, dreg)
# define DEBUG_STOP_HWTRACE(preg, dreg) trace_buffer_stop(preg, dreg)