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x86/irq: Add allocation type for parent domain retrieval

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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
This commit is contained in:
Thomas Gleixner
2020-08-26 13:16:36 +02:00
parent 801b5e4c4e
commit b4c364da32
6 changed files with 15 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/include/asm/hw_irq.h
View File

@@ -40,6 +40,8 @@ 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 {

2
arch/x86/kernel/apic/io_apic.c
View File

@@ -2296,7 +2296,7 @@ static int mp_irqdomain_create(int ioapic)
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)

2
arch/x86/kernel/apic/msi.c
View File

@@ -472,7 +472,7 @@ struct irq_domain *hpet_create_irq_domain(int hpet_id)
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)

8
drivers/iommu/amd/iommu.c
View File

@@ -3548,6 +3548,14 @@ static struct irq_domain *get_ir_irq_domain(struct irq_alloc_info *info)
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];

2
drivers/iommu/hyperv-iommu.c
View File

@@ -184,7 +184,7 @@ static int __init hyperv_enable_irq_remapping(void)
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;

8
drivers/iommu/intel/irq_remapping.c
View File

@@ -1115,16 +1115,12 @@ static struct irq_domain *intel_get_ir_irq_domain(struct irq_alloc_info *info)
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;