Skip to content
Commit 23389d5e authored by Logan Gunthorpe's avatar Logan Gunthorpe Committed by Paul Gortmaker
Browse files

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



commit 3c124435 upstream.

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 ad281ecf ("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 3f0c625c ("iommu/vt-d: Allow interrupts from the entire
bus for aliased devices")

Signed-off-by: default avatarLogan Gunthorpe <logang@deltatee.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
Signed-off-by: default avatarPaul Gortmaker <paul.gortmaker@windriver.com>
parent 47d1e8f6
Loading
Loading
Loading
Loading
0% Loading or .
You are about to add 0 people to the discussion. Proceed with caution.
Please register or to comment