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LoongArch: Add acpi_get_cpu_uid() for unified ACPI CPU UID retrieval

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As a step towards unifying the interface for retrieving ACPI CPU UID
across architectures, introduce a new function acpi_get_cpu_uid() for
loongarch. While at it, add input validation to make the code more
robust.

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20260401081640.26875-3-fengchengwen@huawei.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Chengwen Feng
2026-04-01 16:16:34 +08:00
committed by Rafael J. Wysocki
parent 7cd5f5659a
commit d78ef9d2e1
2 changed files with 10 additions and 0 deletions
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1
arch/loongarch/include/asm/acpi.h
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@@ -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 */

9
arch/loongarch/kernel/acpi.c
View File

@@ -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);