iommu/amd: Return devid as alias for ACPI HID devices

ACPI HID devices do not actually have an alias for
them in the IVRS. But dev_data->alias is still used
for indexing into the IOMMU device table for devices
being handled by the IOMMU. So for ACPI HID devices,
we simply return the corresponding devid as an alias,
as parsed from IVRS table.

Signed-off-by: Arindam Nath <arindam.nath@amd.com>
Fixes: 2bf9a0a12749 ('iommu/amd: Add iommu support for ACPI HID devices')
Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 4e04fff23977..73e47d93e7a0 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -246,7 +246,13 @@ static u16 get_alias(struct device *dev)
 
         /* The callers make sure that get_device_id() does not fail here */
         devid = get_device_id(dev);
+
+        /* For ACPI HID devices, we simply return the devid as such */
+        if (!dev_is_pci(dev))
+                return devid;
+
         ivrs_alias = amd_iommu_alias_table[devid];
+
         pci_for_each_dma_alias(pdev, __last_alias, &pci_alias);
 
         if (ivrs_alias == pci_alias)