[patch V2 30/33] x86/apic/msi: Enable PCI/IMS

Thomas Gleixner
2022-11-21T14:41:15Z

Enable IMS in the domain init and allocation mapping code, but do not
enable it on the vector domain as discussed in various threads on LKML.

The interrupt remap domains can expand this setting like they do with
PCI multi MSI.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/kernel/apic/msi.c | 5 +++++
1 file changed, 5 insertions(+)

--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -184,6 +184,7 @@ static int x86_msi_prepare(struct irq_do
alloc->type = X86_IRQ_ALLOC_TYPE_PCI_MSI;
return 0;
case DOMAIN_BUS_PCI_DEVICE_MSIX:
+ case DOMAIN_BUS_PCI_DEVICE_IMS:
alloc->type = X86_IRQ_ALLOC_TYPE_PCI_MSIX;
return 0;
default:
@@ -230,6 +231,10 @@ static bool x86_init_dev_msi_info(struct
case DOMAIN_BUS_PCI_DEVICE_MSI:
case DOMAIN_BUS_PCI_DEVICE_MSIX:
break;
+ case DOMAIN_BUS_PCI_DEVICE_IMS:
+ if (!(pops->supported_flags & MSI_FLAG_PCI_IMS))
+ return false;
+ break;
default:
WARN_ON_ONCE(1);
return false;