From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 26 Aug 2020 13:16:36 +0200
Subject: x86/irq: Add allocation type for parent domain retrieval
Git-commit: b4c364da32cf3b85297648ff5563de2c47d9e32f
Patch-mainline: v5.10-rc1
References: jsc#SLE-16823

irq_remapping_ir_irq_domain() is used to retrieve the remapping parent
domain for an allocation type. irq_remapping_irq_domain() is for retrieving
the actual device domain for allocating interrupts for a device.

The two functions are similar and can be unified by using explicit modes
for parent irq domain retrieval.

Add X86_IRQ_ALLOC_TYPE_IOAPIC/HPET_GET_PARENT and use it in the iommu
implementations. Drop the parent domain retrieval for PCI_MSI/X as that is
unused.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Joerg Roedel <jroedel@suse.de>
Link: https://lore.kernel.org/r/20200826112331.436350257@linutronix.de
---
 arch/x86/include/asm/hw_irq.h       |    2 ++
 arch/x86/kernel/apic/io_apic.c      |    2 +-
 arch/x86/kernel/apic/msi.c          |    2 +-
 drivers/iommu/amd/iommu.c           |    8 ++++++++
 drivers/iommu/hyperv-iommu.c        |    2 +-
 drivers/iommu/intel/irq_remapping.c |    8 ++------
 6 files changed, 15 insertions(+), 9 deletions(-)

--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -61,6 +61,8 @@ enum irq_alloc_type {
 	X86_IRQ_ALLOC_TYPE_PCI_MSIX,
 	X86_IRQ_ALLOC_TYPE_DMAR,
 	X86_IRQ_ALLOC_TYPE_UV,
+	X86_IRQ_ALLOC_TYPE_IOAPIC_GET_PARENT,
+	X86_IRQ_ALLOC_TYPE_HPET_GET_PARENT,
 };
 
 struct irq_alloc_info {
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2310,7 +2310,7 @@ static int mp_irqdomain_create(int ioapi
 		return 0;
 
 	init_irq_alloc_info(&info, NULL);
-	info.type = X86_IRQ_ALLOC_TYPE_IOAPIC;
+	info.type = X86_IRQ_ALLOC_TYPE_IOAPIC_GET_PARENT;
 	info.ioapic_id = mpc_ioapic_id(ioapic);
 	parent = irq_remapping_get_ir_irq_domain(&info);
 	if (!parent)
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -469,7 +469,7 @@ struct irq_domain *hpet_create_irq_domai
 	domain_info->data = (void *)(long)hpet_id;
 
 	init_irq_alloc_info(&info, NULL);
-	info.type = X86_IRQ_ALLOC_TYPE_HPET;
+	info.type = X86_IRQ_ALLOC_TYPE_HPET_GET_PARENT;
 	info.hpet_id = hpet_id;
 	parent = irq_remapping_get_ir_irq_domain(&info);
 	if (parent == NULL)
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -3540,6 +3540,14 @@ static struct irq_domain *get_ir_irq_dom
 	if (!info)
 		return NULL;
 
+	switch (info->type) {
+	case X86_IRQ_ALLOC_TYPE_IOAPIC_GET_PARENT:
+	case X86_IRQ_ALLOC_TYPE_HPET_GET_PARENT:
+		break;
+	default:
+		return NULL;
+	}
+
 	devid = get_devid(info);
 	if (devid >= 0) {
 		iommu = amd_iommu_rlookup_table[devid];
--- a/drivers/iommu/hyperv-iommu.c
+++ b/drivers/iommu/hyperv-iommu.c
@@ -184,7 +184,7 @@ static int __init hyperv_enable_irq_rema
 
 static struct irq_domain *hyperv_get_ir_irq_domain(struct irq_alloc_info *info)
 {
-	if (info->type == X86_IRQ_ALLOC_TYPE_IOAPIC)
+	if (info->type == X86_IRQ_ALLOC_TYPE_IOAPIC_GET_PARENT)
 		return ioapic_ir_domain;
 	else
 		return NULL;
--- a/drivers/iommu/intel/irq_remapping.c
+++ b/drivers/iommu/intel/irq_remapping.c
@@ -1114,16 +1114,12 @@ static struct irq_domain *intel_get_ir_i
 		return NULL;
 
 	switch (info->type) {
-	case X86_IRQ_ALLOC_TYPE_IOAPIC:
+	case X86_IRQ_ALLOC_TYPE_IOAPIC_GET_PARENT:
 		iommu = map_ioapic_to_ir(info->ioapic_id);
 		break;
-	case X86_IRQ_ALLOC_TYPE_HPET:
+	case X86_IRQ_ALLOC_TYPE_HPET_GET_PARENT:
 		iommu = map_hpet_to_ir(info->hpet_id);
 		break;
-	case X86_IRQ_ALLOC_TYPE_PCI_MSI:
-	case X86_IRQ_ALLOC_TYPE_PCI_MSIX:
-		iommu = map_dev_to_ir(info->msi_dev);
-		break;
 	default:
 		BUG_ON(1);
 		break;