linux-kernel - [PATCH 09/12] iommu/vt-d: Add DEV-MSI support

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Date:   Wed,  3 Feb 2021 12:56:42 -0800
From:   Megha Dey <megha.dey@...el.com>
To:     tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, dave.jiang@...el.com,
        ashok.raj@...el.com, kevin.tian@...el.com, dwmw@...zon.co.uk,
        x86@...nel.org, tony.luck@...el.com, dan.j.williams@...el.com,
        megha.dey@...el.com, jgg@...lanox.com, kvm@...r.kernel.org,
        iommu@...ts.linux-foundation.org, alex.williamson@...hat.com,
        bhelgaas@...gle.com, maz@...nel.org, linux-pci@...r.kernel.org,
        baolu.lu@...ux.intel.com, ravi.v.shankar@...el.com
Subject: [PATCH 09/12] iommu/vt-d: Add DEV-MSI support

Add required support in the interrupt remapping driver for devices
which generate dev-msi interrupts and use the intel remapping
domain as the parent domain. Set the source-id of all dev-msi
interrupt requests to the parent PCI device associated with it.

Reviewed-by: Tony Luck <tony.luck@...el.com>
Signed-off-by: Megha Dey <megha.dey@...el.com>
---
 drivers/iommu/intel/irq_remapping.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/intel/irq_remapping.c b/drivers/iommu/intel/irq_remapping.c
index 685200a..18f1b53 100644
--- a/drivers/iommu/intel/irq_remapping.c
+++ b/drivers/iommu/intel/irq_remapping.c
@@ -1278,6 +1278,9 @@ static void intel_irq_remapping_prepare_irte(struct intel_ir_data *data,
 	case X86_IRQ_ALLOC_TYPE_PCI_MSIX:
 		set_msi_sid(irte, msi_desc_to_pci_dev(info->desc));
 		break;
+	case X86_IRQ_ALLOC_TYPE_DEV_MSI:
+		set_msi_sid(irte, to_pci_dev(info->desc->dev->parent));
+		break;
 	default:
 		BUG_ON(1);
 		break;
@@ -1321,7 +1324,8 @@ static int intel_irq_remapping_alloc(struct irq_domain *domain,
 	if (!info || !iommu)
 		return -EINVAL;
 	if (nr_irqs > 1 && info->type != X86_IRQ_ALLOC_TYPE_PCI_MSI &&
-	    info->type != X86_IRQ_ALLOC_TYPE_PCI_MSIX)
+	    info->type != X86_IRQ_ALLOC_TYPE_PCI_MSIX &&
+	    info->type != X86_IRQ_ALLOC_TYPE_DEV_MSI)
 		return -EINVAL;
 
 	/*
-- 
2.7.4