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

[Bjorn Helgaas]

On Wed, Sep 23, 2026 at 01:39:46PM -0500, Mario Limonciello wrote:
> On 9/23/26 13:36, Bjorn Helgaas wrote:
> > 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!
> 
> Thanks!  Could you add to the commits:
> 
> Cc: stable@xxxxxxxxxxxxxxx
> 
> We should take this back to any non EoL kernel as well.

Done :)