arm64 doesn't support physical hotadd of CPUs that were not present at boot.
Much of the platform description is in static tables which do not have
update methods. arm64 does support HOTPLUG_CPU, which is backed by a
firmware interface to turn CPUs on and off.
acpi_processor_hotadd_init() and acpi_processor_remove() are for adding
and removing CPUs that were not present at boot. arm64 systems that do this
are not supported as there is currently insufficient information in the
platform description. (e.g. did the GICR get removed too?)
arm64 currently relies on the MADT enabled flag check in map_gicc_mpidr()
to prevent CPUs that were not described as present at boot from being
added to the system. Adding support for virtual CPU hotplug (where the
vCPUs have been present the whole time) would require this check to be
removed, possibly allowing physical CPUs to be added.
Disable ACPI_HOTPLUG_CPU for arm64 by removing 'default y' and selecting
it on the other three ACPI architectures. This allows the weak definitions
of some symbols to be removed.
Signed-off-by: James Morse <james.morse@xxxxxxx>
---
arch/ia64/Kconfig | 1 +
arch/loongarch/Kconfig | 1 +
arch/loongarch/include/asm/cpu.h | 7 +++++++
arch/x86/Kconfig | 1 +
drivers/acpi/Kconfig | 1 -
drivers/acpi/acpi_processor.c | 18 ------------------
6 files changed, 10 insertions(+), 19 deletions(-)
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index d7e4a24e8644..deabb8843aea 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -15,6 +15,7 @@ config IA64
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_MIGHT_HAVE_PC_SERIO
select ACPI
+ select ACPI_HOTPLUG_CPU if ACPI
select ACPI_NUMA if NUMA
select ARCH_ENABLE_MEMORY_HOTPLUG
select ARCH_ENABLE_MEMORY_HOTREMOVE
diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index 9cc8b84f7eb0..075aa50e5d5f 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -5,6 +5,7 @@ config LOONGARCH
select ACPI
select ACPI_GENERIC_GSI if ACPI
select ACPI_MCFG if ACPI
+ select ACPI_HOTPLUG_CPU if ACPI
select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
select ARCH_BINFMT_ELF_STATE
select ARCH_ENABLE_MEMORY_HOTPLUG
diff --git a/arch/loongarch/include/asm/cpu.h b/arch/loongarch/include/asm/cpu.h
index 754f28506791..da79862ff1f3 100644
--- a/arch/loongarch/include/asm/cpu.h
+++ b/arch/loongarch/include/asm/cpu.h
@@ -124,4 +124,11 @@ enum cpu_type_enum {
#define LOONGARCH_CPU_GUESTID BIT_ULL(CPU_FEATURE_GUESTID)
#define LOONGARCH_CPU_HYPERVISOR BIT_ULL(CPU_FEATURE_HYPERVISOR)
+#if !defined(__ASSEMBLY__)
+#ifdef CONFIG_HOTPLUG_CPU
+extern int arch_register_cpu(int num);
+extern void arch_unregister_cpu(int);
+#endif
+#endif /* ! __ASSEMBLY__ */
+
#endif /* _ASM_CPU_H */
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 3604074a878b..6a520c22c3eb 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -59,6 +59,7 @@ config X86
#
select ACPI_LEGACY_TABLES_LOOKUP if ACPI
select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
+ select ACPI_HOTPLUG_CPU if ACPI
select ARCH_32BIT_OFF_T if X86_32
select ARCH_CLOCKSOURCE_INIT
select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index ccbeab9500ec..4845e5b525ac 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -309,7 +309,6 @@ config ACPI_HOTPLUG_CPU
bool
depends on ACPI_PROCESSOR && HOTPLUG_CPU
select ACPI_CONTAINER
- default y
config ACPI_PROCESSOR_AGGREGATOR
tristate "Processor Aggregator"
diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index 6737b1cbf6d6..16b314340e68 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -150,24 +150,6 @@ static int acpi_processor_errata(void)
/* Initialization */
#ifdef CONFIG_ACPI_HOTPLUG_CPU
-int __weak acpi_map_cpu(acpi_handle handle,
- phys_cpuid_t physid, u32 acpi_id, int *pcpu)
-{
- return -ENODEV;
-}
-
-int __weak acpi_unmap_cpu(int cpu)
-{
- return -ENODEV;
-}
-
-int __weak arch_register_cpu(int cpu)
-{
- return -ENODEV;
-}
-
-void __weak arch_unregister_cpu(int cpu) {}
-
static int acpi_processor_hotadd_init(struct acpi_processor *pr)
{
unsigned long long sta;
--
2.30.2
