Re: [PATCH v10 0/8] ACPI: Unify CPU UID interface and fix ARM64 TPH steer-tag issue

[Catalin Marinas]

On Fri, Mar 20, 2026 at 11:17:29AM +0800, Chengwen Feng wrote:
> This patchset unifies ACPI Processor UID retrieval across
> arm64/loongarch/riscv/x86 via acpi_get_cpu_uid() (with input validation)
> and fixes ARM64 CPU steer-tag retrieval failure in PCI/TPH:
> 
> 1-4: Add acpi_get_cpu_uid() for arm64/loongarch/riscv/x86 (update
>      respective users)
> 5: Centralize acpi_get_cpu_uid() declaration in include/linux/acpi.h
> 6: Clean up perf/arm_cspmu
> 7: Clean up ACPI/PPTT and remove unused get_acpi_id_for_cpu()
> 8: Pass ACPI Processor UID to Cache Locality _DSM
> 
> The interface refactor ensures consistent CPU UID retrieval across
> architectures (no functional changes for valid inputs) and provides the
> unified interface required for the ARM64 TPH fix.
> 
> ---
> Changes in v10:
> - Refine commit header&log according to Punit's and Bjorn's review
> - Split perf/arm_cspmu as a separate commit which address Punit's
>   review
> 
> Changes in v9:
> - Address Bjorn's review: split commits to each platform so that make
>   them easy to review
> 
> Changes in v8:
> - Moving arm64's get_cpu_for_acpi_id() to kernel/acpi.c which address
>   Jeremy's review
> 
> Chengwen Feng (8):
>   arm64: acpi: Add acpi_get_cpu_uid() for unified ACPI CPU UID retrieval
>   LoongArch: Add acpi_get_cpu_uid() for unified ACPI CPU UID retrieval
>   RISC-V: ACPI: Add acpi_get_cpu_uid() for unified ACPI CPU UID
>     retrieval
>   x86/acpi: Add acpi_get_cpu_uid() for unified ACPI CPU UID retrieval
>   ACPI: Centralize acpi_get_cpu_uid() declaration in
>     include/linux/acpi.h
>   perf: arm_cspmu: Switch to acpi_get_cpu_uid() from
>     get_acpi_id_for_cpu()
>   ACPI: PPTT: Use acpi_get_cpu_uid() and remove get_acpi_id_for_cpu()
>   PCI/TPH: Pass ACPI Processor UID to Cache Locality _DSM
> 
>  Documentation/PCI/tph.rst          |  4 +--
>  arch/arm64/include/asm/acpi.h      | 17 +---------
>  arch/arm64/kernel/acpi.c           | 30 ++++++++++++++++++

For the arm64 bits:

Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>