printk: Log printk events
Log printk events to the uncached buffer. If a reset occurs
and printk data is still present in the cache, information will
be lost. This doesn't store the actual printk, but it at least
gives information on who the last caller was.
Change-Id: If1bd414a44b19b45c157d23a7ddde8f16b30e780
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: Trevor Bourget <tbourget@codeaurora.org>
diff --git a/arch/arm/mach-msm/include/mach/msm_rtb.h b/arch/arm/mach-msm/include/mach/msm_rtb.h
index a24e892..ac45cbd 100644
--- a/arch/arm/mach-msm/include/mach/msm_rtb.h
+++ b/arch/arm/mach-msm/include/mach/msm_rtb.h
@@ -17,6 +17,7 @@
LOGK_NONE = 0,
LOGK_READL,
LOGK_WRITEL,
+ LOGK_LOGBUF,
LOGK_OTHER,
};
diff --git a/arch/arm/mach-msm/msm_rtb.c b/arch/arm/mach-msm/msm_rtb.c
index d765f6a..f93a79b 100644
--- a/arch/arm/mach-msm/msm_rtb.c
+++ b/arch/arm/mach-msm/msm_rtb.c
@@ -65,6 +65,7 @@
struct msm_rtb_state msm_rtb = {
.size = SZ_1M,
+ .filter = 1 << LOGK_LOGBUF,
};
module_param_named(filter, msm_rtb.filter, uint, 0644);
diff --git a/kernel/printk.c b/kernel/printk.c
index dbaa948..3c31395 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -41,7 +41,7 @@
#include <linux/cpu.h>
#include <linux/notifier.h>
#include <linux/rculist.h>
-
+#include <mach/msm_rtb.h>
#include <asm/uaccess.h>
/*
@@ -784,6 +784,11 @@
{
va_list args;
int r;
+#ifdef CONFIG_MSM_RTB
+ void *caller = __builtin_return_address(0);
+
+ uncached_logk_pc(LOGK_LOGBUF, caller, (void *)log_end);
+#endif
#ifdef CONFIG_KGDB_KDB
if (unlikely(kdb_trap_printk)) {