tree 40f1cfb1cafd88d34fd97455bedf32b1380b7d74
parent 3332364e4ebc0581d133a334645a20fd13b580f1
author Logan Gunthorpe <logang@deltatee.com> 1571781681 -0600
committer Joerg Roedel <jroedel@suse.de> 1572428179 +0100

iommu/amd: Support multiple PCI DMA aliases in IRQ Remapping

Non-Transparent Bridge (NTB) devices (among others) may have many DMA
aliases seeing the hardware will send requests with different device ids
depending on their origin across the bridged hardware.

See commit ad281ecf1c7d ("PCI: Add DMA alias quirk for Microsemi Switchtec
NTB") for more information on this.

The AMD IOMMU IRQ remapping functionality ignores all PCI aliases for
IRQs so if devices send an interrupt from one of their aliases they
will be blocked on AMD hardware with the IOMMU enabled.

To fix this, ensure IRQ remapping is enabled for all aliases with
MSI interrupts.

This is analogous to the functionality added to the Intel IRQ remapping
code in commit 3f0c625c6ae7 ("iommu/vt-d: Allow interrupts from the entire
bus for aliased devices")

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>