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

[Niklas Cassel]

On Sun, Sep 20, 2026 at 11:52:08PM -0500, Mario Limonciello wrote:
> On 9/8/26 2:05 PM, 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(-)
> > 
> 
> Gentle ping on this series.

I can pick up patch 2/2, but want to wait until patch 1/2 has been picked
up either by Bjorn, or one of the x86 maintainers.


Kind regards,
Niklas