From 2e0d085de70b9972788c71865e0531613651d16e Mon Sep 17 00:00:00 2001
From: Dorian Stoll <dorian.stoll@tmsp.io>
Date: Sun, 11 Dec 2022 12:03:38 +0100
Subject: [PATCH 10/41] iommu: intel: Disable source id verification for ITHC

Signed-off-by: Dorian Stoll <dorian.stoll@tmsp.io>
Patchset: ithc
---
 drivers/iommu/intel/irq_remapping.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/iommu/intel/irq_remapping.c b/drivers/iommu/intel/irq_remapping.c
index 08f56326e2f8..75218b38995c 100644
--- a/drivers/iommu/intel/irq_remapping.c
+++ b/drivers/iommu/intel/irq_remapping.c
@@ -386,6 +386,22 @@ static int set_msi_sid(struct irte *irte, struct pci_dev *dev)
 	data.busmatch_count = 0;
 	pci_for_each_dma_alias(dev, set_msi_sid_cb, &data);
 
+	/*
+	 * The Intel Touch Host Controller is at 00:10.6, but for some reason
+	 * the MSI interrupts have request id 01:05.0.
+	 * Disable id verification to work around this.
+	 * FIXME Find proper fix or turn this into a quirk.
+	 */
+	if (dev->vendor == PCI_VENDOR_ID_INTEL && (dev->class >> 8) == PCI_CLASS_INPUT_PEN) {
+		switch(dev->device) {
+		case 0x98d0: case 0x98d1: // LKF
+		case 0xa0d0: case 0xa0d1: // TGL LP
+		case 0x43d0: case 0x43d1: // TGL H
+			set_irte_sid(irte, SVT_NO_VERIFY, SQ_ALL_16, 0);
+			return 0;
+		}
+	}
+
 	/*
 	 * DMA alias provides us with a PCI device and alias.  The only case
 	 * where the it will return an alias on a different bus than the
-- 
2.41.0