linux-kernel - [tip: x86/irq] PCI_vmd_Mark_VMD_irqdomain_with_DOMAIN_BUS_VMD

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Date:   Wed, 16 Sep 2020 15:12:12 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Joerg Roedel <jroedel@...e.de>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/irq] PCI_vmd_Mark_VMD_irqdomain_with_DOMAIN_BUS_VMD_MSI

The following commit has been merged into the x86/irq branch of tip:

Commit-ID:     d7f954e54079b4bf6088956d59f43768ec71269a
Gitweb:        https://git.kernel.org/tip/d7f954e54079b4bf6088956d59f43768ec71269a
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Wed, 26 Aug 2020 13:16:52 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Wed, 16 Sep 2020 16:52:36 +02:00

PCI_vmd_Mark_VMD_irqdomain_with_DOMAIN_BUS_VMD_MSI

Devices on the VMD bus use their own MSI irq domain, but it is not
distinguishable from regular PCI/MSI irq domains. This is required
to exclude VMD devices from getting the irq domain pointer set by
interrupt remapping.

Override the default bus token.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
Acked-by: Joerg Roedel <jroedel@...e.de>
Link: https://lore.kernel.org/r/20200826112333.047315047@linutronix.de

---
 drivers/pci/controller/vmd.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
index 411eed6..aa1b12b 100644
--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c
@@ -580,6 +580,12 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
 		return -ENODEV;
 	}
 
+	/*
+	 * Override the irq domain bus token so the domain can be distinguished
+	 * from a regular PCI/MSI domain.
+	 */
+	irq_domain_update_bus_token(vmd->irq_domain, DOMAIN_BUS_VMD_MSI);
+
 	pci_add_resource(&resources, &vmd->resources[0]);
 	pci_add_resource_offset(&resources, &vmd->resources[1], offset[0]);
 	pci_add_resource_offset(&resources, &vmd->resources[2], offset[1]);