4.18-stable review patch. If anyone has any objections, please let me know.
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From: Arindam Nath arindam.nath@amd.com
[ Upstream commit 5ebb1bc2d63d90dd204169e21fd7a0b4bb8c776e ]
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 Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iommu/amd_iommu.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- 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)