diff options
| -rw-r--r-- | arch/x86/include/asm/apic.h | 3 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/topology.c | 113 |
2 files changed, 98 insertions, 18 deletions
diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h index 11938d5206f4..28e9aa46d1ed 100644 --- a/arch/x86/include/asm/apic.h +++ b/arch/x86/include/asm/apic.h @@ -171,7 +171,10 @@ extern bool apic_needs_pit(void); extern void apic_send_IPI_allbutself(unsigned int vector); +extern void topology_register_apic(u32 apic_id, u32 acpi_id, bool present); extern void topology_register_boot_apic(u32 apic_id); +extern int topology_hotplug_apic(u32 apic_id, u32 acpi_id); +extern void topology_hotunplug_apic(unsigned int cpu); #else /* !CONFIG_X86_LOCAL_APIC */ static inline void lapic_shutdown(void) { } diff --git a/arch/x86/kernel/cpu/topology.c b/arch/x86/kernel/cpu/topology.c index b99cd19b7d12..3dd7e6c08cb5 100644 --- a/arch/x86/kernel/cpu/topology.c +++ b/arch/x86/kernel/cpu/topology.c @@ -84,32 +84,38 @@ early_initcall(smp_init_primary_thread_mask); static inline void cpu_mark_primary_thread(unsigned int cpu, unsigned int apicid) { } #endif -/* - * Should use this API to allocate logical CPU IDs to keep nr_logical_cpuids - * and cpuid_to_apicid[] synchronized. - */ -static int allocate_logical_cpuid(int apicid) +static int topo_lookup_cpuid(u32 apic_id) { int i; - /* - * cpuid <-> apicid mapping is persistent, so when a cpu is up, - * check if the kernel has allocated a cpuid for it. - */ + /* CPU# to APICID mapping is persistent once it is established */ for (i = 0; i < nr_logical_cpuids; i++) { - if (cpuid_to_apicid[i] == apicid) + if (cpuid_to_apicid[i] == apic_id) return i; } + return -ENODEV; +} + +/* + * Should use this API to allocate logical CPU IDs to keep nr_logical_cpuids + * and cpuid_to_apicid[] synchronized. + */ +static int allocate_logical_cpuid(u32 apic_id) +{ + int cpu = topo_lookup_cpuid(apic_id); + + if (cpu >= 0) + return cpu; /* Allocate a new cpuid. */ if (nr_logical_cpuids >= nr_cpu_ids) { WARN_ONCE(1, "APIC: NR_CPUS/possible_cpus limit of %u reached. " "Processor %d/0x%x and the rest are ignored.\n", - nr_cpu_ids, nr_logical_cpuids, apicid); + nr_cpu_ids, nr_logical_cpuids, apic_id); return -EINVAL; } - cpuid_to_apicid[nr_logical_cpuids] = apicid; + cpuid_to_apicid[nr_logical_cpuids] = apic_id; return nr_logical_cpuids++; } @@ -127,12 +133,6 @@ static void cpu_update_apic(int cpu, u32 apicid) cpu_mark_primary_thread(cpu, apicid); } -void __init topology_register_boot_apic(u32 apic_id) -{ - cpuid_to_apicid[0] = apic_id; - cpu_update_apic(0, apic_id); -} - int generic_processor_info(int apicid) { int cpu, max = nr_cpu_ids; @@ -174,6 +174,83 @@ int generic_processor_info(int apicid) return cpu; } +/** + * topology_register_apic - Register an APIC in early topology maps + * @apic_id: The APIC ID to set up + * @acpi_id: The ACPI ID associated to the APIC + * @present: True if the corresponding CPU is present + */ +void __init topology_register_apic(u32 apic_id, u32 acpi_id, bool present) +{ + int cpu; + + if (apic_id >= MAX_LOCAL_APIC) { + pr_err_once("APIC ID %x exceeds kernel limit of: %x\n", apic_id, MAX_LOCAL_APIC - 1); + return; + } + + if (!present) { + disabled_cpus++; + return; + } + + cpu = generic_processor_info(apic_id); + if (cpu >= 0) + early_per_cpu(x86_cpu_to_acpiid, cpu) = acpi_id; +} + +/** + * topology_register_boot_apic - Register the boot CPU APIC + * @apic_id: The APIC ID to set up + * + * Separate so CPU #0 can be assigned + */ +void __init topology_register_boot_apic(u32 apic_id) +{ + cpuid_to_apicid[0] = apic_id; + cpu_update_apic(0, apic_id); +} + +#ifdef CONFIG_ACPI_HOTPLUG_CPU +/** + * topology_hotplug_apic - Handle a physical hotplugged APIC after boot + * @apic_id: The APIC ID to set up + * @acpi_id: The ACPI ID associated to the APIC + */ +int topology_hotplug_apic(u32 apic_id, u32 acpi_id) +{ + int cpu; + + if (apic_id >= MAX_LOCAL_APIC) + return -EINVAL; + + cpu = topo_lookup_cpuid(apic_id); + if (cpu < 0) { + cpu = generic_processor_info(apic_id); + if (cpu >= 0) + per_cpu(x86_cpu_to_acpiid, cpu) = acpi_id; + } + return cpu; +} + +/** + * topology_hotunplug_apic - Remove a physical hotplugged APIC after boot + * @cpu: The CPU number for which the APIC ID is removed + */ +void topology_hotunplug_apic(unsigned int cpu) +{ + u32 apic_id = cpuid_to_apicid[cpu]; + + if (apic_id == BAD_APICID) + return; + + per_cpu(x86_cpu_to_apicid, cpu) = BAD_APICID; + clear_bit(apic_id, phys_cpu_present_map); + set_cpu_present(cpu, false); + num_processors--; +} +#endif + static int __init apic_set_disabled_cpu_apicid(char *arg) { if (!arg || !get_option(&arg, &disabled_cpu_apicid)) |