diff options
Diffstat (limited to 'arch/x86/kernel/smpboot.c')
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 26118b4a1c3..45119d39f31 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -7,6 +7,7 @@ #include <linux/err.h> #include <linux/nmi.h> +#include <asm/acpi.h> #include <asm/desc.h> #include <asm/nmi.h> #include <asm/irq.h> @@ -75,6 +76,8 @@ EXPORT_PER_CPU_SYMBOL(cpu_info); static atomic_t init_deasserted; +static int boot_cpu_logical_apicid; + /* ready for x86_64, no harm for x86, since it will overwrite after alloc */ unsigned char *trampoline_base = __va(SMP_TRAMPOLINE_BASE); @@ -1002,6 +1005,173 @@ int __cpuinit native_cpu_up(unsigned int cpu) } /* + * Fall back to non SMP mode after errors. + * + * RED-PEN audit/test this more. I bet there is more state messed up here. + */ +static __init void disable_smp(void) +{ + cpu_present_map = cpumask_of_cpu(0); + cpu_possible_map = cpumask_of_cpu(0); +#ifdef CONFIG_X86_32 + smpboot_clear_io_apic_irqs(); +#endif + if (smp_found_config) + phys_cpu_present_map = + physid_mask_of_physid(boot_cpu_physical_apicid); + else + phys_cpu_present_map = physid_mask_of_physid(0); + map_cpu_to_logical_apicid(); + cpu_set(0, per_cpu(cpu_sibling_map, 0)); + cpu_set(0, per_cpu(cpu_core_map, 0)); +} + +/* + * Various sanity checks. + */ +static int __init smp_sanity_check(unsigned max_cpus) +{ + if (!physid_isset(hard_smp_processor_id(), phys_cpu_present_map)) { + printk(KERN_WARNING "weird, boot CPU (#%d) not listed" + "by the BIOS.\n", hard_smp_processor_id()); + physid_set(hard_smp_processor_id(), phys_cpu_present_map); + } + + /* + * If we couldn't find an SMP configuration at boot time, + * get out of here now! + */ + if (!smp_found_config && !acpi_lapic) { + printk(KERN_NOTICE "SMP motherboard not detected.\n"); + disable_smp(); + if (APIC_init_uniprocessor()) + printk(KERN_NOTICE "Local APIC not detected." + " Using dummy APIC emulation.\n"); + return -1; + } + + /* + * Should not be necessary because the MP table should list the boot + * CPU too, but we do it for the sake of robustness anyway. + */ + if (!check_phys_apicid_present(boot_cpu_physical_apicid)) { + printk(KERN_NOTICE + "weird, boot CPU (#%d) not listed by the BIOS.\n", + boot_cpu_physical_apicid); + physid_set(hard_smp_processor_id(), phys_cpu_present_map); + } + + /* + * If we couldn't find a local APIC, then get out of here now! + */ + if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid]) && + !cpu_has_apic) { + printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n", + boot_cpu_physical_apicid); + printk(KERN_ERR "... forcing use of dummy APIC emulation." + "(tell your hw vendor)\n"); + smpboot_clear_io_apic(); + return -1; + } + + verify_local_APIC(); + + /* + * If SMP should be disabled, then really disable it! + */ + if (!max_cpus) { + printk(KERN_INFO "SMP mode deactivated," + "forcing use of dummy APIC emulation.\n"); + smpboot_clear_io_apic(); +#ifdef CONFIG_X86_32 + if (nmi_watchdog == NMI_LOCAL_APIC) { + printk(KERN_INFO "activating minimal APIC for" + "NMI watchdog use.\n"); + connect_bsp_APIC(); + setup_local_APIC(); + end_local_APIC_setup(); + } +#endif + return -1; + } + + return 0; +} + +static void __init smp_cpu_index_default(void) +{ + int i; + struct cpuinfo_x86 *c; + + for_each_cpu_mask(i, cpu_possible_map) { + c = &cpu_data(i); + /* mark all to hotplug */ + c->cpu_index = NR_CPUS; + } +} + +/* + * Prepare for SMP bootup. The MP table or ACPI has been read + * earlier. Just do some sanity checking here and enable APIC mode. + */ +void __init native_smp_prepare_cpus(unsigned int max_cpus) +{ + nmi_watchdog_default(); + smp_cpu_index_default(); + current_cpu_data = boot_cpu_data; + cpu_callin_map = cpumask_of_cpu(0); + mb(); + /* + * Setup boot CPU information + */ + smp_store_cpu_info(0); /* Final full version of the data */ + boot_cpu_logical_apicid = logical_smp_processor_id(); + current_thread_info()->cpu = 0; /* needed? */ + set_cpu_sibling_map(0); + + if (smp_sanity_check(max_cpus) < 0) { + printk(KERN_INFO "SMP disabled\n"); + disable_smp(); + return; + } + + if (GET_APIC_ID(apic_read(APIC_ID)) != boot_cpu_physical_apicid) { + panic("Boot APIC ID in local APIC unexpected (%d vs %d)", + GET_APIC_ID(apic_read(APIC_ID)), boot_cpu_physical_apicid); + /* Or can we switch back to PIC here? */ + } + +#ifdef CONFIG_X86_32 + connect_bsp_APIC(); +#endif + /* + * Switch from PIC to APIC mode. + */ + setup_local_APIC(); + +#ifdef CONFIG_X86_64 + /* + * Enable IO APIC before setting up error vector + */ + if (!skip_ioapic_setup && nr_ioapics) + enable_IO_APIC(); +#endif + end_local_APIC_setup(); + + map_cpu_to_logical_apicid(); + + setup_portio_remap(); + + smpboot_setup_io_apic(); + /* + * Set up local APIC timer on boot CPU. + */ + + printk(KERN_INFO "CPU%d: ", 0); + print_cpu_info(&cpu_data(0)); + setup_boot_clock(); +} +/* * Early setup to make printk work. */ void __init native_smp_prepare_boot_cpu(void) |