linux-kernel - [PATCH 5/6] x86/apic/msi: Use Real PCI DMA device when configuring IRTE

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Date:   Tue, 28 Jul 2020 13:49:44 -0600
From:   Jon Derrick <jonathan.derrick@...el.com>
To:     <linux-pci@...r.kernel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     Bjorn Helgaas <helgaas@...nel.org>, Christoph Hellwig <hch@....de>,
        Andrzej Jakowski <andrzej.jakowski@...ux.intel.com>,
        Sushma Kalakota <sushmax.kalakota@...el.com>,
        <linux-kernel@...r.kernel.org>, <x86@...nel.org>,
        Jon Derrick <jonathan.derrick@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...el.com>
Subject: [PATCH 5/6] x86/apic/msi: Use Real PCI DMA device when configuring IRTE

VMD retransmits child device MSI/X with the VMD endpoint's requester-id.
In order to support direct interrupt remapping of VMD child devices,
ensure that the IRTE is programmed with the VMD endpoint's requester-id
using pci_real_dma_dev().

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...el.com>
Signed-off-by: Jon Derrick <jonathan.derrick@...el.com>
---
 arch/x86/kernel/apic/msi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index c2b2911feeef..7ca271b8d891 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -189,7 +189,7 @@ int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 
 	init_irq_alloc_info(&info, NULL);
 	info.type = X86_IRQ_ALLOC_TYPE_MSI;
-	info.msi_dev = dev;
+	info.msi_dev = pci_real_dma_dev(dev);
 
 	domain = irq_remapping_get_irq_domain(&info);
 	if (domain == NULL)
-- 
2.27.0