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Subject[PATCH] kernel/panic: Use SYSTEM_RESET2 command for warm reset
Date
Some platforms may need warm reboot support when kernel crashed
for post mortem analysis instead of cold reboot. So use config
CONFIG_WARM_REBOOT_ON_PANIC and SYSTEM_RESET2 psci command
support for warm reset.

Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
---
kernel/panic.c | 4 ++++
lib/Kconfig.debug | 10 ++++++++++
2 files changed, 14 insertions(+)

diff --git a/kernel/panic.c b/kernel/panic.c
index c1fcaad..6ab6675 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -198,6 +198,10 @@ void panic(const char *fmt, ...)

console_verbose();
bust_spinlocks(1);
+#ifdef CONFIG_WARM_REBOOT_ON_PANIC
+ /* Configure for warm reboot instead of cold reboot. */
+ reboot_mode = REBOOT_WARM;
+#endif
va_start(args, fmt);
len = vscnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index d695ec1..2a727d8 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1000,6 +1000,16 @@ config PANIC_TIMEOUT
value n > 0 will wait n seconds before rebooting, while a timeout
value n < 0 will reboot immediately.

+config WARM_REBOOT_ON_PANIC
+ bool "Warm reboot instead of cold reboot for panic"
+ default n
+ help
+ Some vendor platform may need warm reboot instead of cold reboot
+ for debugging. Before vendor specific power off driver is
+ probed, platform always gets cold reset. By setting Y here and
+ support for PSCI V1.1 is present from firmware, platform would
+ get warm reset instead of cold reset.
+
config SCHED_DEBUG
bool "Collect scheduler debugging info"
depends on DEBUG_KERNEL && PROC_FS
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,\na Linux Foundation Collaborative Project
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