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Subject[PATCH v12 4/4] arm64: handle NOTIFY_SEI notification by the APEI driver
Date
Add a helper to handle the NOTIFY_SEI notification, when kernel
gets the NOTIFY_SEI notification, call this helper and let APEI
driver to handle this notification.

Signed-off-by: Dongjiu Geng <gengdongjiu@huawei.com>
---
arch/arm64/include/asm/system_misc.h | 1 +
arch/arm64/kernel/traps.c | 4 ++++
arch/arm64/mm/fault.c | 10 ++++++++++
3 files changed, 15 insertions(+)

diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h
index 07aa8e3..9ee13ad 100644
--- a/arch/arm64/include/asm/system_misc.h
+++ b/arch/arm64/include/asm/system_misc.h
@@ -57,6 +57,7 @@ void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
})

int handle_guest_sea(phys_addr_t addr, unsigned int esr);
+int handle_guest_sei(void);

#endif /* __ASSEMBLY__ */

diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index bbb0fde..d888eb2 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -681,6 +681,10 @@ bool arm64_is_fatal_ras_serror(struct pt_regs *regs, unsigned int esr)
{
u32 aet = arm64_ras_serror_get_severity(esr);

+ /* The APEI driver may handle this RAS error. */
+ if (!handle_guest_sei())
+ return false;
+
switch (aet) {
case ESR_ELx_AET_CE: /* corrected error */
case ESR_ELx_AET_UEO: /* restartable, not yet consumed */
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index f76bb2c..8f29bd8 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -683,6 +683,16 @@ int handle_guest_sea(phys_addr_t addr, unsigned int esr)
return ret;
}

+int handle_guest_sei(void)
+{
+ int ret = -ENOENT;
+
+ if (IS_ENABLED(CONFIG_ACPI_APEI_SEI))
+ ret = ghes_notify_sei();
+
+ return ret;
+}
+
asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
struct pt_regs *regs)
{
--
1.9.1
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