Re: [edk2-devel] [PATCH] DynamicTablesPkg: Fix ETE _UID Creation

["Ashish Singhal via groups.io" <ashishsingha=nvidia.com@groups.io>]

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________________________________
From: Leif Lindholm <quic_llindhol@quicinc.com>
Sent: Wednesday, November 15, 2023 9:21 AM
To: Ashish Singhal <ashishsingha@nvidia.com>
Cc: devel@edk2.groups.io <devel@edk2.groups.io>; ardb+tianocore@kernel.org <ardb+tianocore@kernel.org>; sami.mujawar@arm.com <sami.mujawar@arm.com>; Jeff Brasen <jbrasen@nvidia.com>
Subject: Re: [PATCH] DynamicTablesPkg: Fix ETE _UID Creation

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On Tue, Nov 14, 2023 at 20:19:04 -0700, Ashish Singhal wrote:
> Just like CPU _UID, ETE UID also needs to be unique so
> use AcpiProcessorUid instead of CpuName
>
> Signed-off-by: Ashish Singhal <ashishsingha@nvidia.com>
> ---
>  .../Arm/AcpiSsdtCpuTopologyLibArm/SsdtCpuTopologyGenerator.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtCpuTopologyLibArm/SsdtCpuTopologyGenerator.c b/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtCpuTopologyLibArm/SsdtCpuTopologyGenerator.c
> index 8228c7845a..724f33c660 100644
> --- a/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtCpuTopologyLibArm/SsdtCpuTopologyGenerator.c
> +++ b/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtCpuTopologyLibArm/SsdtCpuTopologyGenerator.c
> @@ -359,6 +359,7 @@ CreateAmlCpcNode (
>
>    @param [in]  Generator    The SSDT Cpu Topology generator.
>    @param [in]  ParentNode   Parent node to attach the Cpu node to.
> +  @param [in]  GicCInfo     CM_ARM_GICC_INFO object used to create the node.
>    @param [in]  CpuName      Value used to generate the node name.

Can that replace both uses of CpuName in the function (so it can be
dropped), or does

  Status = WriteAslName ('E', CpuName, AslName);

have other requirements?

/
    Leif

Hello Leif,

CPU Name can be more logical, and you may have the same CPU name in different clusters for example. _UID however needs to be unique.

Thanks
Ashish

>    @param [out] EtNodePtr   If not NULL, return the created Cpu node.
>
> @@ -372,6 +373,7 @@ EFIAPI
>  CreateAmlEtd (
>    IN   ACPI_CPU_TOPOLOGY_GENERATOR  *Generator,
>    IN   AML_NODE_HANDLE              ParentNode,
> +  IN   CM_ARM_GICC_INFO             *GicCInfo,
>    IN   UINT32                       CpuName,
>    OUT  AML_OBJECT_NODE_HANDLE       *EtNodePtr OPTIONAL
>    )
> @@ -397,7 +399,7 @@ CreateAmlEtd (
>
>    Status = AmlCodeGenNameInteger (
>               "_UID",
> -             CpuName,
> +             GicCInfo->AcpiProcessorUid,
>               EtNode,
>               NULL
>               );
> @@ -474,6 +476,7 @@ CreateAmlEtNode (
>    Status = CreateAmlEtd (
>               Generator,
>               Node,
> +             GicCInfo,
>               CpuName,
>               NULL
>               );
> --
> 2.17.1
>


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