From: Chengwen Feng <fengchengwen@huawei.com>
To: Bjorn Helgaas <bhelgaas@google.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
"Rafael J . Wysocki" <rafael@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>,
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Huacai Chen <chenhuacai@kernel.org>,
WANG Xuerui <kernel@xen0n.name>, Paul Walmsley <pjw@kernel.org>,
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Subject: [PATCH v9 2/7] loongarch/acpi: Add acpi_get_cpu_uid() declaration and implementation
Date: Thu, 19 Mar 2026 14:57:30 +0800 [thread overview]
Message-ID: <20260319065735.45954-3-fengchengwen@huawei.com> (raw)
In-Reply-To: <20260319065735.45954-1-fengchengwen@huawei.com>
Add arch-specific acpi_get_cpu_uid() for loongarch:
- Declare acpi_get_cpu_uid() in arch/loongarch/include/asm/acpi.h
- Implement acpi_get_cpu_uid() with input parameter validation
Align loongarch with the new unified ACPI CPU UID retrieval interface,
preparing for replacement of the legacy get_acpi_id_for_cpu() (to be
removed in follow-up patches).
Cc: stable@vger.kernel.org
Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
---
arch/loongarch/include/asm/acpi.h | 1 +
arch/loongarch/kernel/acpi.c | 9 +++++++++
2 files changed, 10 insertions(+)
diff --git a/arch/loongarch/include/asm/acpi.h b/arch/loongarch/include/asm/acpi.h
index 7376840fa9f7..8bb101b4557e 100644
--- a/arch/loongarch/include/asm/acpi.h
+++ b/arch/loongarch/include/asm/acpi.h
@@ -44,6 +44,7 @@ static inline u32 get_acpi_id_for_cpu(unsigned int cpu)
{
return acpi_core_pic[cpu_logical_map(cpu)].processor_id;
}
+int acpi_get_cpu_uid(unsigned int cpu, u32 *uid);
#endif /* !CONFIG_ACPI */
diff --git a/arch/loongarch/kernel/acpi.c b/arch/loongarch/kernel/acpi.c
index 1367ca759468..058f0dbe8e8f 100644
--- a/arch/loongarch/kernel/acpi.c
+++ b/arch/loongarch/kernel/acpi.c
@@ -385,3 +385,12 @@ int acpi_unmap_cpu(int cpu)
EXPORT_SYMBOL(acpi_unmap_cpu);
#endif /* CONFIG_ACPI_HOTPLUG_CPU */
+
+int acpi_get_cpu_uid(unsigned int cpu, u32 *uid)
+{
+ if (cpu >= nr_cpu_ids)
+ return -EINVAL;
+ *uid = acpi_core_pic[cpu_logical_map(cpu)].processor_id;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(acpi_get_cpu_uid);
--
2.17.1
next prev parent reply other threads:[~2026-03-19 6:57 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-19 6:57 [PATCH v9 0/7] ACPI: Unify CPU UID interface and fix ARM64 TPH steer-tag issue Chengwen Feng
2026-03-19 6:57 ` [PATCH v9 1/7] arm64/acpi: Add acpi_get_cpu_uid() and switch arm_cspmu to use it Chengwen Feng
2026-03-19 15:46 ` Punit Agrawal
2026-03-20 3:20 ` fengchengwen
2026-03-19 6:57 ` Chengwen Feng [this message]
2026-03-19 6:57 ` [PATCH v9 3/7] riscv/acpi: Add acpi_get_cpu_uid() implementation and update users Chengwen Feng
2026-03-19 6:57 ` [PATCH v9 4/7] x86/acpi: Add acpi_get_cpu_uid() implementation and update Xen users Chengwen Feng
2026-03-19 7:05 ` Jürgen Groß
2026-03-19 6:57 ` [PATCH v9 5/7] ACPI: Centralize acpi_get_cpu_uid() declaration in include/linux/acpi.h Chengwen Feng
2026-03-19 6:57 ` [PATCH v9 6/7] ACPI: PPTT: Use acpi_get_cpu_uid() and remove get_acpi_id_for_cpu() Chengwen Feng
2026-03-19 6:57 ` [PATCH v9 7/7] PCI/TPH: Fix get cpu steer-tag fail on ARM64 platform Chengwen Feng
2026-03-19 18:32 ` Bjorn Helgaas
2026-03-20 3:26 ` fengchengwen
2026-03-19 10:58 ` [PATCH v9 0/7] ACPI: Unify CPU UID interface and fix ARM64 TPH steer-tag issue Jonathan Cameron
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