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

[Mario Limonciello <superm1@kernel.org>]

On 9/22/26 04:49, Niklas Cassel wrote:
> 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

I think it would be better that this all goes through one tree so we 
don't end up with a situation that someone has the revert but not the fix.

So maybe better to leave an A-b tag on 2/2 and then let pci or tip pick 
up the series.