On Thu, Jun 30, 2022 at 11:40:59AM +0200, Eric Auger wrote:
> 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]>
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