Re: [PATCH v2 0/2] Fix for storage corruption w/ AMD IOMMU on 64-bit addressing

[Bjorn Helgaas]

On Tue, Sep 08, 2026 at 02:05:58PM -0500, Mario Limonciello wrote:
> An issue has been reported by a number of people that corruption
> was occurring on storage for desktop systems.  It's notably reported
> on SATA, but the same issue also appears on NVME.
> 
> At a glance it looks like an IOMMU issue as turning off the IOMMU helps
> the issue, but it's actually a problem that occurs specifically with any
> IOVA addressed >58 bits.
> 
> This is because the BIOS on these systems is enabling a feature of the
> root port called 'enhanced atomics' which repurposes those upper 5 bits
> of address space.  That feature should only be enabled by the BIOS when
> the partner device supports it, but it's instead needlessly enabled on a
> number of root ports.
> 
> As some of these systems probably won't receive BIOS updates and there is
> active reports of data corruption root caused to this add a quirk to
> disable it on affected models, and also remove the quirk that was
> introduced to work around this issue in drivers/ata.
> 
> v2:
>  *  Added resume fixups for the affected AMD PCIe ports
> 
> Mario Limonciello (2):
>   x86/PCI: Disable enhanced atomics on some AMD PCIe ports
>   Revert "ata: ahci: force 32-bit DMA for JMicron JMB582/JMB585"
> 
>  arch/x86/pci/fixup.c | 99 ++++++++++++++++++++++++++++++++++++++++++++
>  drivers/ata/ahci.c   | 18 --------
>  2 files changed, 99 insertions(+), 18 deletions(-)

Applied to pci/for-linus for v7.3, thanks!