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x86/ACPI: keep x86_cpu_to_acpiid mapping valid on CPU hotplug

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We may or may not have all possible CPUs in MADT on boot but in any
case we're overwriting x86_cpu_to_acpiid mapping with U32_MAX when
acpi_register_lapic() is called again on the CPU hotplug path:

acpi_processor_hotadd_init()
  -> acpi_map_cpu()
    -> acpi_register_lapic()

As we have the required acpi_id information in acpi_processor_hotadd_init()
propagate it to acpi_map_cpu() to always keep x86_cpu_to_acpiid
mapping valid.

Reported-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Vitaly Kuznetsov 2017-02-06 18:01:51 +01:00 committed by Rafael J. Wysocki
parent d5adbfcd5f
commit febf240741
4 changed files with 9 additions and 6 deletions
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3
arch/ia64/kernel/acpi.c
View File

@ -887,7 +887,8 @@ static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
}
/* wrapper to silence section mismatch warning */
int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu)
int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
int *pcpu)
{
return _acpi_map_lsapic(handle, physid, pcpu);
}

5
arch/x86/kernel/acpi/boot.c
View File

@ -723,11 +723,12 @@ int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
return 0;
}
int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu)
int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
int *pcpu)
{
int cpu;
cpu = acpi_register_lapic(physid, U32_MAX, ACPI_MADT_ENABLED);
cpu = acpi_register_lapic(physid, acpi_id, ACPI_MADT_ENABLED);
if (cpu < 0) {
pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
return cpu;

4
drivers/acpi/acpi_processor.c
View File

@ -165,7 +165,7 @@ static int acpi_processor_errata(void)
#ifdef CONFIG_ACPI_HOTPLUG_CPU
int __weak acpi_map_cpu(acpi_handle handle,
phys_cpuid_t physid, int *pcpu)
phys_cpuid_t physid, u32 acpi_id, int *pcpu)
{
return -ENODEV;
}
@ -203,7 +203,7 @@ static int acpi_processor_hotadd_init(struct acpi_processor *pr)
cpu_maps_update_begin();
cpu_hotplug_begin();
ret = acpi_map_cpu(pr->handle, pr->phys_id, &pr->id);
ret = acpi_map_cpu(pr->handle, pr->phys_id, pr->acpi_id, &pr->id);
if (ret)
goto out;

3
include/linux/acpi.h
View File

@ -291,7 +291,8 @@ bool acpi_processor_validate_proc_id(int proc_id);
#ifdef CONFIG_ACPI_HOTPLUG_CPU
/* Arch dependent functions for cpu hotplug support */
int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu);
int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
int *pcpu);
int acpi_unmap_cpu(int cpu);
int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid);
#endif /* CONFIG_ACPI_HOTPLUG_CPU */