diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/cpu/common.c | 27 | ||||
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 99 |
2 files changed, 79 insertions, 47 deletions
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index a4bcbacdbe0b..a135239badb7 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -1221,17 +1221,6 @@ static void dbg_restore_debug_regs(void) #define dbg_restore_debug_regs() #endif /* ! CONFIG_KGDB */ -static void wait_for_master_cpu(int cpu) -{ - /* - * wait for ACK from master CPU before continuing - * with AP initialization - */ - WARN_ON(cpumask_test_and_set_cpu(cpu, cpu_initialized_mask)); - while (!cpumask_test_cpu(cpu, cpu_callout_mask)) - cpu_relax(); -} - /* * cpu_init() initializes state that is per-CPU. Some data is already * initialized (naturally) in the bootstrap process, such as the GDT @@ -1247,17 +1236,16 @@ void cpu_init(void) struct task_struct *me; struct tss_struct *t; unsigned long v; - int cpu = stack_smp_processor_id(); + int cpu; int i; - wait_for_master_cpu(cpu); - /* * Load microcode on this cpu if a valid microcode is available. * This is early microcode loading procedure. */ load_ucode_ap(); + cpu = stack_smp_processor_id(); t = &per_cpu(init_tss, cpu); oist = &per_cpu(orig_ist, cpu); @@ -1269,6 +1257,9 @@ void cpu_init(void) me = current; + if (cpumask_test_and_set_cpu(cpu, cpu_initialized_mask)) + panic("CPU#%d already initialized!\n", cpu); + pr_debug("Initializing CPU#%d\n", cpu); clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE); @@ -1345,10 +1336,14 @@ void cpu_init(void) struct tss_struct *t = &per_cpu(init_tss, cpu); struct thread_struct *thread = &curr->thread; - wait_for_master_cpu(cpu); - show_ucode_info_early(); + if (cpumask_test_and_set_cpu(cpu, cpu_initialized_mask)) { + printk(KERN_WARNING "CPU#%d already initialized!\n", cpu); + for (;;) + local_irq_enable(); + } + printk(KERN_INFO "Initializing CPU#%d\n", cpu); if (cpu_has_vme || cpu_has_tsc || cpu_has_de) diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index bc52fac39dd3..ae2fd975b782 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -111,6 +111,7 @@ atomic_t init_deasserted; static void smp_callin(void) { int cpuid, phys_id; + unsigned long timeout; /* * If waken up by an INIT in an 82489DX configuration @@ -129,6 +130,37 @@ static void smp_callin(void) * (This works even if the APIC is not enabled.) */ phys_id = read_apic_id(); + if (cpumask_test_cpu(cpuid, cpu_callin_mask)) { + panic("%s: phys CPU#%d, CPU#%d already present??\n", __func__, + phys_id, cpuid); + } + pr_debug("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpuid, phys_id); + + /* + * STARTUP IPIs are fragile beasts as they might sometimes + * trigger some glue motherboard logic. Complete APIC bus + * silence for 1 second, this overestimates the time the + * boot CPU is spending to send the up to 2 STARTUP IPIs + * by a factor of two. This should be enough. + */ + + /* + * Waiting 2s total for startup (udelay is not yet working) + */ + timeout = jiffies + 2*HZ; + while (time_before(jiffies, timeout)) { + /* + * Has the boot CPU finished it's STARTUP sequence? + */ + if (cpumask_test_cpu(cpuid, cpu_callout_mask)) + break; + cpu_relax(); + } + + if (!time_before(jiffies, timeout)) { + panic("%s: CPU%d started up but did not get a callout!\n", + __func__, cpuid); + } /* * the boot CPU has finished the init stage and is spinning @@ -718,8 +750,8 @@ static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle) unsigned long start_ip = real_mode_header->trampoline_start; unsigned long boot_error = 0; + int timeout; int cpu0_nmi_registered = 0; - unsigned long timeout; /* Just in case we booted with a single CPU. */ alternatives_enable_smp(); @@ -767,15 +799,6 @@ static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle) } /* - * AP might wait on cpu_callout_mask in cpu_init() with - * cpu_initialized_mask set if previous attempt to online - * it timed-out. Clear cpu_initialized_mask so that after - * INIT/SIPI it could start with a clean state. - */ - cpumask_clear_cpu(cpu, cpu_initialized_mask); - smp_mb(); - - /* * Wake up a CPU in difference cases: * - Use the method in the APIC driver if it's defined * Otherwise, @@ -787,41 +810,55 @@ static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle) boot_error = wakeup_cpu_via_init_nmi(cpu, start_ip, apicid, &cpu0_nmi_registered); - if (!boot_error) { /* - * Wait 10s total for a response from AP + * allow APs to start initializing. */ - boot_error = -1; - timeout = jiffies + 10*HZ; - while (time_before(jiffies, timeout)) { - if (cpumask_test_cpu(cpu, cpu_initialized_mask)) { - /* - * Tell AP to proceed with initialization - */ - cpumask_set_cpu(cpu, cpu_callout_mask); - boot_error = 0; - break; - } - udelay(100); - schedule(); - } - } + pr_debug("Before Callout %d\n", cpu); + cpumask_set_cpu(cpu, cpu_callout_mask); + pr_debug("After Callout %d\n", cpu); - if (!boot_error) { /* - * Wait till AP completes initial initialization + * Wait 5s total for a response */ - while (!cpumask_test_cpu(cpu, cpu_callin_mask)) { + for (timeout = 0; timeout < 50000; timeout++) { + if (cpumask_test_cpu(cpu, cpu_callin_mask)) + break; /* It has booted */ + udelay(100); /* * Allow other tasks to run while we wait for the * AP to come online. This also gives a chance * for the MTRR work(triggered by the AP coming online) * to be completed in the stop machine context. */ - udelay(100); schedule(); } + + if (cpumask_test_cpu(cpu, cpu_callin_mask)) { + print_cpu_msr(&cpu_data(cpu)); + pr_debug("CPU%d: has booted.\n", cpu); + } else { + boot_error = 1; + if (*trampoline_status == 0xA5A5A5A5) + /* trampoline started but...? */ + pr_err("CPU%d: Stuck ??\n", cpu); + else + /* trampoline code not run */ + pr_err("CPU%d: Not responding\n", cpu); + if (apic->inquire_remote_apic) + apic->inquire_remote_apic(apicid); + } + } + + if (boot_error) { + /* Try to put things back the way they were before ... */ + numa_remove_cpu(cpu); /* was set by numa_add_cpu */ + + /* was set by do_boot_cpu() */ + cpumask_clear_cpu(cpu, cpu_callout_mask); + + /* was set by cpu_init() */ + cpumask_clear_cpu(cpu, cpu_initialized_mask); } /* mark "stuck" area as not stuck */ |