Re: [patch RFC 20/38] PCI: vmd: Mark VMD irqdomain with DOMAIN_BUS_VMD_MSI

Bjorn Helgaas
2020-08-25T20:04:30Z

On Fri, Aug 21, 2020 at 02:24:44AM +0200, Thomas Gleixner wrote:
> Devices on the VMD bus use their own MSI irq domain, but it is not
> distinguishable from regular PCI/MSI irq domains. This is required
> to exclude VMD devices from getting the irq domain pointer set by
> interrupt remapping.
>
> Override the default bus token.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Jonathan Derrick <jonathan.derrick@intel.com>
> Cc: linux-pci@vger.kernel.org

Acked-by: Bjorn Helgaas <bhelgaas@google.com>

> ---
> drivers/pci/controller/vmd.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> --- a/drivers/pci/controller/vmd.c
> +++ b/drivers/pci/controller/vmd.c
> @@ -579,6 +579,12 @@ static int vmd_enable_domain(struct vmd_
> return -ENODEV;
> }
>
> + /*
> + * Override the irq domain bus token so the domain can be distinguished
> + * from a regular PCI/MSI domain.
> + */
> + irq_domain_update_bus_token(vmd->irq_domain, DOMAIN_BUS_VMD_MSI);
> +
> pci_add_resource(&resources, &vmd->resources[0]);
> pci_add_resource_offset(&resources, &vmd->resources[1], offset[0]);
> pci_add_resource_offset(&resources, &vmd->resources[2], offset[1]);
>