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

[Mario Limonciello <mario.limonciello@amd.com>]

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@vger.kernel.org

We should take this back to any non EoL kernel as well.