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authorTony W Wang-oc <TonyWWang-oc@zhaoxin.com>2020-01-15 16:22:19 +0800
committerThomas Gleixner <tglx@linutronix.de>2020-02-07 15:32:16 +0100
commit0f378d73d429d5f73fe2f00be4c9a15dbe9779ee (patch)
tree7b69609200913e2fd5e3f1f886de6de997461206
parent05bd330a7fd8875c423fc07d8ddcad73c10e556e (diff)
x86/apic: Mask IOAPIC entries when disabling the local APIC
When a system suspends, the local APIC is disabled in the suspend sequence, but the IOAPIC is left in the current state. This means unmasked interrupt lines stay unmasked. This is usually the case for IOAPIC pin 9 to which the ACPI interrupt is connected. That means that in suspended state the IOAPIC can respond to an external interrupt, e.g. the wakeup via keyboard/RTC/ACPI, but the interrupt message cannot be handled by the disabled local APIC. As a consequence the Remote IRR bit is set, but the local APIC does not send an EOI to acknowledge it. This causes the affected interrupt line to become stale and the stale Remote IRR bit will cause a hang when __synchronize_hardirq() is invoked for that interrupt line. To prevent this, mask all IOAPIC entries before disabling the local APIC. The resume code already has the unmask operation inside. [ tglx: Massaged changelog ] Signed-off-by: Tony W Wang-oc <TonyWWang-oc@zhaoxin.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/1579076539-7267-1-git-send-email-TonyWWang-oc@zhaoxin.com
-rw-r--r--arch/x86/kernel/apic/apic.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 4b0f9117e1cd..5f973fed3c9f 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2639,6 +2639,13 @@ static int lapic_suspend(void)
#endif
local_irq_save(flags);
+
+ /*
+ * Mask IOAPIC before disabling the local APIC to prevent stale IRR
+ * entries on some implementations.
+ */
+ mask_ioapic_entries();
+
disable_local_APIC();
irq_remapping_disable();