ACPI: VIOT: Fix ACS setup
[ Upstream commit 3dcb861dbc6ab101838a1548b1efddd00ca3c3ec ]
Currently acpi_viot_init() gets called after the pci
device has been scanned and pci_enable_acs() has been called.
So pci_request_acs() fails to be taken into account leading
to wrong single iommu group topologies when dealing with
multi-function root ports for instance.
We cannot simply move the acpi_viot_init() earlier, similarly
as the IORT init because the VIOT parsing relies on the pci
scan. However we can detect VIOT is present earlier and in
such a case, request ACS. Introduce a new acpi_viot_early_init()
routine that allows to call pci_request_acs() before the scan.
While at it, guard the call to pci_request_acs() with #ifdef
CONFIG_PCI.
Fixes: 3cf485540e7b ("ACPI: Add driver for the VIOT table")
Signed-off-by: Eric Auger <[email protected]>
Reported-by: Jin Liu <[email protected]>
Reviewed-by: Jean-Philippe Brucker <[email protected]>
Tested-by: Jean-Philippe Brucker <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
3 files changed
