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[PATCH v5 0/2] Fix get cpu steer-tag fail on ARM64 platform
- To: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will@xxxxxxxxxx>, "Rafael J . Wysocki" <rafael@xxxxxxxxxx>
- From: Chengwen Feng <fengchengwen@xxxxxxxxxx>
- Date: Tue, 10 Mar 2026 11:20:47 +0800
- Cc: Jonathan Corbet <corbet@xxxxxxx>, Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>, Huacai Chen <chenhuacai@xxxxxxxxxx>, WANG Xuerui <kernel@xxxxxxxxxx>, Paul Walmsley <pjw@xxxxxxxxxx>, Palmer Dabbelt <palmer@xxxxxxxxxxx>, Albert Ou <aou@xxxxxxxxxxxxxxxxx>, Alexandre Ghiti <alex@xxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, <x86@xxxxxxxxxx>, "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>, Chengwen Feng <fengchengwen@xxxxxxxxxx>, 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>, Ajit Khaparde <ajit.khaparde@xxxxxxxxxxxx>, Wei Huang <wei.huang2@xxxxxxx>, Andy Gospodarek <andrew.gospodarek@xxxxxxxxxxxx>, Somnath Kotur <somnath.kotur@xxxxxxxxxxxx>, <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, 10 Mar 2026 05:55:50 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
This patchset addresses the issue where retrieving the CPU steer-tag
fails on ARM64 platforms. The first commit is a pure renaming of the
ACPI CPU ID retrieval interface (no functional changes), which serves
as preparation for the second commit that implements the core fix for
the steer-tag retrieval logic.
---
Changes in v5:
- Refine commit-log of commit 2/2
- Replace cpu_acpi_id() by acpi_get_cpu_acpi_id() on x86
Changes in v4:
- Split the rename into a separate commit.
Changes in v3:
- Rename existing get_acpi_id_for_cpu() to acpi_get_cpu_acpi_id() other
than add one new API.
Changes in v2:
- Add ECN _DSM reference doc name and its URL.
- Separate implement acpi_get_cpu_acpi_id() in each arch which supports
ACPI.
- Refine commit-log.
Chengwen Feng (2):
ACPI: Rename get_acpi_id_for_cpu() to acpi_get_cpu_acpi_id() on
non-x86
PCI/TPH: Fix get cpu steer-tag fail on ARM64 platform
Documentation/PCI/tph.rst | 4 ++--
arch/arm64/include/asm/acpi.h | 4 ++--
arch/loongarch/include/asm/acpi.h | 2 +-
arch/riscv/include/asm/acpi.h | 2 +-
arch/riscv/kernel/acpi_numa.c | 2 +-
arch/x86/include/asm/acpi.h | 2 ++
arch/x86/include/asm/cpu.h | 1 -
arch/x86/include/asm/smp.h | 1 -
arch/x86/kernel/cpu/common.c | 12 ++++++++++++
arch/x86/xen/enlighten_hvm.c | 4 ++--
drivers/acpi/pptt.c | 16 ++++++++--------
drivers/acpi/riscv/rhct.c | 2 +-
drivers/pci/tph.c | 11 ++++++-----
drivers/perf/arm_cspmu/arm_cspmu.c | 2 +-
include/linux/pci-tph.h | 4 ++--
15 files changed, 41 insertions(+), 28 deletions(-)
--
2.17.1
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