APPLIED[P]: [PATCH 0/1][SRU][Plucky/Oracular] Handle IOMMU IVRS entries with mismatched UID on AMD Strix or newer platforms

[Stefan Bader]

On 25.06.25 12:06, You-Sheng Yang wrote:
> BugLink: https://bugs.launchpad.net/bugs/2115174
> 
> [ Impact ]
> 
> A BIOS upgrade has changed the IVRS DTE UID for a device that no longer
> matches the UID in the SSDT and may potentially affect s0i3 on Linux
> systems.
> 
> [ Test Plan ]
> 
> 1. Dump IVRS table:
> ```
> # install acpica-tools
> $ sudo apt-get install --no-install-recommends --yes acpica-tools
> $ sudo acpidump -o acpi.dump
> $ acpixtract -a acpi.dump
> $ iasl -d ivrs.dat
> 
> ```
> 
> 2. Search for subtable type F0 in decoded ivrs.dsl:
> ```
> [176h 0374 001h]               Subtable Type : F0 [Device Entry: ACPI HID Named Device]
> [177h 0375 002h]                   Device ID : 00A5
> [179h 0377 001h] Data Setting (decoded below) : 40
>                                      INITPass : 0
>                                      EIntPass : 0
>                                       NMIPass : 0
>                                      Reserved : 0
>                                   System MGMT : 0
>                                    LINT0 Pass : 1
>                                    LINT1 Pass : 0
> [17Ah 0378 008h]                    ACPI HID : "AMDI0020"
> [182h 0386 008h]                    ACPI CID : 0000000000000000
> [18Ah 0394 001h]                  UID Format : 02
> [18Bh 0395 001h]                  UID Length : 04
> [18Ch 0396 004h]                         UID : "ID01"
> ```
> 
> 3. Locate the MHSP device from SSDT tables:
> ```
>   grep -n 'Device (MHSP)' -A4 ssdt*.dsl
> ssdt34.dsl:25:        Device (MHSP)
> ssdt34.dsl-26-        {
> ssdt34.dsl-27-            Name (_ADR, Zero)  // _ADR: Address
> ssdt34.dsl-28-            Name (_HID, "MSFT0201")  // _HID: Hardware ID
> ssdt34.dsl-29-            Name (_UID, One)  // _UID: Unique ID
> ```
> 
> 4. From IVRS the UID is "ID01" yet it's numeric 1 from SSDT, so this system
>     is affected.
> 
> [ Where problems could occur ]
> 
> This restore the ability to match UID correctly as before. No side effect.
> 
> [ Other Info ]
> 
> Such BIOS upgrade may occur for Strix, Krackan, Strix Halo, and Gorgon
> Point systems. Nominate for series with kernels >= v6.11 and < v6.16-rc1.
> 
> Mario Limonciello (1):
>    iommu/amd: Allow matching ACPI HID devices without matching UIDs
> 
>   drivers/iommu/amd/iommu.c | 33 ++++++++++++++++++++++++++++-----
>   1 file changed, 28 insertions(+), 5 deletions(-)
> 

Applied to plucky:linux/master-next. Thanks.

-Stefan

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