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Date:   Mon, 05 Dec 2022 21:41:46 -0000
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Subject: [tip: irq/core] x86/apic/msi: Enable PCI/IMS
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Kevin Tian <kevin.tian@intel.com>,
        Marc Zyngier <maz@kernel.org>, x86@kernel.org,
        linux-kernel@vger.kernel.org
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The following commit has been merged into the irq/core branch of tip:

Commit-ID:     6e24c887732901140f4e82ba2315c2e15f06f1d6
Gitweb:        https://git.kernel.org/tip/6e24c887732901140f4e82ba2315c2e15f06f1d6
Author:        Thomas Gleixner <tglx@linutronix.de>
AuthorDate:    Fri, 25 Nov 2022 00:26:32 +01:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Mon, 05 Dec 2022 22:22:35 +01:00

x86/apic/msi: Enable PCI/IMS

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>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221124232327.022658817@linutronix.de

---
 arch/x86/kernel/apic/msi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index 682f51a..35d5b8f 100644
--- 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_domain *domain, struct device *dev,
 		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 device *dev, struct irq_domain *domain,
 	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;