diff options
| author | Prasad Sodagudi <psodagud@codeaurora.org> | 2017-03-06 11:04:46 -0800 |
|---|---|---|
| committer | Prasad Sodagudi <psodagud@codeaurora.org> | 2017-03-09 10:07:35 -0800 |
| commit | 4f659aa55edf0c322710abfd9389501f8f68dc79 (patch) | |
| tree | bb3227c6b3fe5fd379394df65cd3df9dab3d85ba | |
| parent | 647076b679f3ac76db31d875eda2d7a99be764e6 (diff) | |
rcu: Induce msm watchdog bite for rcu stalls
Every RCU stall need to be debugged, So collect the ram
dumps on every RCU stall to debug further by inducing
non secure watchdog bite whenever rcu stall detected.
Change-Id: I6c1cfddc92f06b48c3f22fe9970b70f2ec670bf6
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
| -rw-r--r-- | kernel/rcu/tree.c | 12 | ||||
| -rw-r--r-- | lib/Kconfig.debug | 11 |
2 files changed, 23 insertions, 0 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index f07343b54fe5..2cb46d51d715 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -57,6 +57,8 @@ #include <linux/trace_events.h> #include <linux/suspend.h> +#include <soc/qcom/watchdog.h> + #include "tree.h" #include "rcu.h" @@ -1298,6 +1300,11 @@ static void print_other_cpu_stall(struct rcu_state *rsp, unsigned long gpnum) rcu_check_gp_kthread_starvation(rsp); +#ifdef CONFIG_RCU_STALL_WATCHDOG_BITE + /* Induce watchdog bite */ + msm_trigger_wdog_bite(); +#endif + force_quiescent_state(rsp); /* Kick them all. */ } @@ -1333,6 +1340,11 @@ static void print_cpu_stall(struct rcu_state *rsp) jiffies + 3 * rcu_jiffies_till_stall_check() + 3); raw_spin_unlock_irqrestore(&rnp->lock, flags); +#ifdef CONFIG_RCU_STALL_WATCHDOG_BITE + /* Induce non secure watchdog bite to collect context */ + msm_trigger_wdog_bite(); +#endif + /* * Attempt to revive the RCU machinery by forcing a context switch. * diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 902657d4cac5..3cd6011f209d 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1455,6 +1455,17 @@ config RCU_CPU_STALL_TIMEOUT RCU grace period persists, additional CPU stall warnings are printed at more widely spaced intervals. +config RCU_STALL_WATCHDOG_BITE + bool "RCU stall induce watchdog bite" + depends on RCU_STALL_COMMON && QCOM_WATCHDOG_V2 + help + Induce watchdog bite if RCU grace period extends more than + specified no of seconds instead of just warning messages. + This helps to collect ram dumps and cpu context for + postmortem analysis. Generally if a given RCU grace period + extends more than the specified number of seconds, + a CPU stall warning is printed. + config RCU_TRACE bool "Enable tracing for RCU" depends on DEBUG_KERNEL |