Add the ability for drivers to register SError hooks to be run
on a fatal SError interrupt. This allows printing of system-specific
error information to aid with debugging.
Signed-off-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
---
arch/arm64/include/asm/traps.h | 6 ++++++
arch/arm64/kernel/traps.c | 20 ++++++++++++++++++++
2 files changed, 26 insertions(+)
diff --git a/arch/arm64/include/asm/traps.h b/arch/arm64/include/asm/traps.h
index 54f32a0675df..054fecfa22f0 100644
--- a/arch/arm64/include/asm/traps.h
+++ b/arch/arm64/include/asm/traps.h
@@ -22,8 +22,14 @@ struct undef_hook {
int (*fn)(struct pt_regs *regs, u32 instr);
};
+struct serror_hook {
+ struct list_head node;
+ void (*fn)(void);
+};
+
void register_undef_hook(struct undef_hook *hook);
void unregister_undef_hook(struct undef_hook *hook);
+void register_serror_hook(struct serror_hook *hook);
void force_signal_inject(int signal, int code, unsigned long address, unsigned int err);
void arm64_notify_segfault(unsigned long addr);
void arm64_force_sig_fault(int signo, int code, unsigned long far, const char *str);
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 273066279bb5..02dbaab71ea3 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -890,8 +890,23 @@ void panic_bad_stack(struct pt_regs *regs, unsigned int esr, unsigned long far)
}
#endif
+static LIST_HEAD(serror_hook);
+static DEFINE_RAW_SPINLOCK(serror_lock);
+
+void register_serror_hook(struct serror_hook *hook)
+{
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&serror_lock, flags);
+ list_add(&hook->node, &serror_hook);
+ raw_spin_unlock_irqrestore(&serror_lock, flags);
+}
+
void __noreturn arm64_serror_panic(struct pt_regs *regs, u32 esr)
{
+ struct serror_hook *hook;
+ unsigned long flags;
+
console_verbose();
pr_crit("SError Interrupt on CPU%d, code 0x%08x -- %s\n",
@@ -899,6 +914,11 @@ void __noreturn arm64_serror_panic(struct pt_regs *regs, u32 esr)
if (regs)
__show_regs(regs);
+ raw_spin_lock_irqsave(&serror_lock, flags);
+ list_for_each_entry(hook, &serror_hook, node)
+ hook->fn();
+ raw_spin_unlock_irqrestore(&serror_lock, flags);
+
nmi_panic(regs, "Asynchronous SError Interrupt");
cpu_park_loop();
--
2.30.1
