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

[fengchengwen <fengchengwen@huawei.com>]

On 3/31/2026 8:24 PM, Rafael J. Wysocki wrote:
> On Fri, Mar 20, 2026 at 4:17 AM Chengwen Feng <fengchengwen@huawei.com> 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 ++++++++++++++++++
>>  arch/loongarch/include/asm/acpi.h  |  5 ---
>>  arch/loongarch/kernel/acpi.c       |  9 ++++++
>>  arch/riscv/include/asm/acpi.h      |  4 ---
>>  arch/riscv/kernel/acpi.c           | 16 ++++++++++
>>  arch/riscv/kernel/acpi_numa.c      |  9 ++++--
>>  arch/x86/include/asm/cpu.h         |  1 -
>>  arch/x86/include/asm/smp.h         |  1 -
>>  arch/x86/kernel/acpi/boot.c        | 20 ++++++++++++
>>  arch/x86/xen/enlighten_hvm.c       |  5 +--
>>  drivers/acpi/pptt.c                | 50 ++++++++++++++++++++++--------
>>  drivers/acpi/riscv/rhct.c          |  7 ++++-
>>  drivers/pci/tph.c                  | 16 +++++++---
>>  drivers/perf/arm_cspmu/arm_cspmu.c |  6 ++--
>>  include/linux/acpi.h               | 11 +++++++
>>  include/linux/pci-tph.h            |  4 +--
>>  18 files changed, 158 insertions(+), 57 deletions(-)
>>
>> --
> 
> It doesn't look like anyone has a particular heartburn related to this
> series, so I could apply it in principle, but I'd appreciate some ACKs
> from arch maintainers.
> 
> Why don't you resend it with all of the tags collected so far (and
> please add x86@kernel.org to the CC list)?

done for resend v10 which with all the review/ack tag, add add x86@kernel.org to CC list

Thanks