msm: Add support for uncached buffer logging
Add an API to print data to a small uncached buffer.
When a system reset occurs valuable data may still
be remaining in the cache (e.g. last printks) and this
data will probably be lost, giving an incomplete picture
of what the system was last doing. By logging useful
information to this uncached region (e.g. readl/writel,
last printk) a better picture of what the system was
last doing emerges.
Change-Id: I1f2c548059cb6bba8003f11fd1c54e7f789dfbae
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
diff --git a/arch/arm/mach-msm/Kconfig b/arch/arm/mach-msm/Kconfig
index 0cec5f2..8a7d466 100644
--- a/arch/arm/mach-msm/Kconfig
+++ b/arch/arm/mach-msm/Kconfig
@@ -2017,4 +2017,21 @@
instead of pmem. Selecting this may also involve userspace
dependencies as well.
+config MSM_RTB
+ bool "Register tracing"
+ help
+ Add support for logging different events to a small uncached
+ region. This is designed to aid in debugging reset cases where the
+ caches may not be flushed before the target resets.
+
+config MSM_RTB_SEPARATE_CPUS
+ bool "Separate entries for each cpu"
+ depends on MSM_RTB
+ help
+ Under some circumstances, it may be beneficial to give dedicated space
+ for each cpu to log accesses. Selecting this option will log each cpu
+ separately. This will guarantee that the last acesses for each cpu
+ will be logged but there will be fewer entries per cpu
+
+
endif