From: Maxim Levitsky <mlevitsk@redhat.com>
Date: Tue, 23 Nov 2021 18:10:37 +0200
Subject: iommu/amd: X2apic mode: mask/unmask interrupts on suspend/resume
Git-commit: 1980105e3cfc2215c75b4f6b172661d675c467d1
Patch-mainline: v5.17-rc1
References: git-fixes

Use IRQCHIP_MASK_ON_SUSPEND to make the core irq code to
mask the iommu interrupt on suspend and unmask it on the resume.

Since now the unmask function updates the INTX settings,
that will restore them on resume from s3/s4.

Since IRQCHIP_MASK_ON_SUSPEND is only effective for interrupts
which are not wakeup sources, remove IRQCHIP_SKIP_SET_WAKE flag
and instead implement a dummy .irq_set_wake which doesn't allow
the interrupt to become a wakeup source.

Fixes: 66929812955bb ("iommu/amd: Add support for X2APIC IOMMU interrupts")

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Link: https://lore.kernel.org/r/20211123161038.48009-5-mlevitsk@redhat.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
 drivers/iommu/amd/init.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -2101,6 +2101,11 @@ static int intcapxt_set_affinity(struct
 	return 0;
 }
 
+static int intcapxt_set_wake(struct irq_data *irqd, unsigned int on)
+{
+	return on ? -EOPNOTSUPP : 0;
+}
+
 static struct irq_chip intcapxt_controller = {
 	.name			= "IOMMU-MSI",
 	.irq_unmask		= intcapxt_unmask_irq,
@@ -2108,7 +2113,8 @@ static struct irq_chip intcapxt_controll
 	.irq_ack		= irq_chip_ack_parent,
 	.irq_retrigger		= irq_chip_retrigger_hierarchy,
 	.irq_set_affinity       = intcapxt_set_affinity,
-	.flags			= IRQCHIP_SKIP_SET_WAKE,
+	.irq_set_wake		= intcapxt_set_wake,
+	.flags			= IRQCHIP_MASK_ON_SUSPEND,
 };
 
 static const struct irq_domain_ops intcapxt_domain_ops = {