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Re: [PATCH v10 0/8] ACPI: Unify CPU UID interface and fix ARM64 TPH steer-tag issue
- To: Chengwen Feng <fengchengwen@xxxxxxxxxx>
- From: Catalin Marinas <catalin.marinas@xxxxxxx>
- Date: Tue, 31 Mar 2026 18:31:33 +0100
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- Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>, Will Deacon <will@xxxxxxxxxx>, "Rafael J . Wysocki" <rafael@xxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Palmer Dabbelt <palmer@xxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, "H . Peter Anvin" <hpa@xxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Len Brown <lenb@xxxxxxxxxx>, Sunil V L <sunilvl@xxxxxxxxxxxxxxxx>, Mark Rutland <mark.rutland@xxxxxxx>, Jonathan Cameron <jonathan.cameron@xxxxxxxxxx>, Kees Cook <kees@xxxxxxxxxx>, Yanteng Si <si.yanteng@xxxxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>, Kai Huang <kai.huang@xxxxxxxxx>, Tom Lendacky <thomas.lendacky@xxxxxxx>, Thomas Huth <thuth@xxxxxxxxxx>, Thorsten Blum <thorsten.blum@xxxxxxxxx>, Kevin Loughlin <kevinloughlin@xxxxxxxxxx>, Zheyun Shen <szy0127@xxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Pawan Gupta <pawan.kumar.gupta@xxxxxxxxxxxxxxx>, Xin Li <xin@xxxxxxxxx>, "Ahmed S . Darwish" <darwi@xxxxxxxxxxxxx>, Sohil Mehta <sohil.mehta@xxxxxxxxx>, Ilkka Koskinen <ilkka@xxxxxxxxxxxxxxxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, James Clark <james.clark@xxxxxxxxxx>, Besar Wicaksono <bwicaksono@xxxxxxxxxx>, Ma Ke <make24@xxxxxxxxxxx>, Wei Huang <wei.huang2@xxxxxxx>, Andy Gospodarek <andrew.gospodarek@xxxxxxxxxxxx>, Somnath Kotur <somnath.kotur@xxxxxxxxxxxx>, punit.agrawal@xxxxxxxxxxxxxxxx, guohanjun@xxxxxxxxxx, suzuki.poulose@xxxxxxx, ryan.roberts@xxxxxxx, chenl311@xxxxxxxxxxxxxxx, masahiroy@xxxxxxxxxx, wangyuquan1236@xxxxxxxxxxxxxx, anshuman.khandual@xxxxxxx, heinrich.schuchardt@xxxxxxxxxxxxx, Eric.VanTassell@xxxxxxx, wangzhou1@xxxxxxxxxxxxx, wanghuiqiang@xxxxxxxxxx, liuyonglong@xxxxxxxxxx, linux-pci@xxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, loongarch@xxxxxxxxxxxxxxx, linux-riscv@xxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-acpi@xxxxxxxxxxxxxxx, linux-perf-users@xxxxxxxxxxxxxxx, stable@xxxxxxxxxxxxxxx
- Delivery-date: Tue, 31 Mar 2026 17:32:02 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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>
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