diff options
Diffstat (limited to 'arch/arm64/kernel/smp.c')
| -rw-r--r-- | arch/arm64/kernel/smp.c | 101 |
1 files changed, 97 insertions, 4 deletions
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index b1adc51b2c2e..b2d5f4ee9a1c 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -63,6 +63,8 @@ * where to place its SVC stack */ struct secondary_data secondary_data; +/* Number of CPUs which aren't online, but looping in kernel text. */ +int cpus_stuck_in_kernel; enum ipi_msg_type { IPI_RESCHEDULE, @@ -70,8 +72,19 @@ enum ipi_msg_type { IPI_CPU_STOP, IPI_TIMER, IPI_IRQ_WORK, + IPI_WAKEUP }; +#ifdef CONFIG_HOTPLUG_CPU +static int op_cpu_kill(unsigned int cpu); +#else +static inline int op_cpu_kill(unsigned int cpu) +{ + return -ENOSYS; +} +#endif + + /* * Boot a secondary CPU, and assign it the specified idle task. * This also gives us the initial stack to use for this CPU. @@ -89,12 +102,14 @@ static DECLARE_COMPLETION(cpu_running); int __cpu_up(unsigned int cpu, struct task_struct *idle) { int ret; + long status; /* * We need to tell the secondary core where to find its stack and the * page tables. */ secondary_data.stack = task_stack_page(idle) + THREAD_START_SP; + update_cpu_boot_status(CPU_MMU_OFF); __flush_dcache_area(&secondary_data, sizeof(secondary_data)); /* @@ -118,6 +133,32 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle) } secondary_data.stack = NULL; + status = READ_ONCE(secondary_data.status); + if (ret && status) { + + if (status == CPU_MMU_OFF) + status = READ_ONCE(__early_cpu_boot_status); + + switch (status) { + default: + pr_err("CPU%u: failed in unknown state : 0x%lx\n", + cpu, status); + break; + case CPU_KILL_ME: + if (!op_cpu_kill(cpu)) { + pr_crit("CPU%u: died during early boot\n", cpu); + break; + } + /* Fall through */ + pr_crit("CPU%u: may not have shut down cleanly\n", cpu); + case CPU_STUCK_IN_KERNEL: + pr_crit("CPU%u: is stuck in kernel\n", cpu); + cpus_stuck_in_kernel++; + break; + case CPU_PANIC_KERNEL: + panic("CPU%u detected unsupported configuration\n", cpu); + } + } return ret; } @@ -149,9 +190,7 @@ asmlinkage void secondary_start_kernel(void) * TTBR0 is only used for the identity mapping at this stage. Make it * point to zero page to avoid speculatively fetching new entries. */ - cpu_set_reserved_ttbr0(); - local_flush_tlb_all(); - cpu_set_default_tcr_t0sz(); + cpu_uninstall_idmap(); preempt_disable(); trace_hardirqs_off(); @@ -185,6 +224,9 @@ asmlinkage void secondary_start_kernel(void) */ pr_info("CPU%u: Booted secondary processor [%08x]\n", cpu, read_cpuid_id()); + update_cpu_boot_status(CPU_BOOT_SUCCESS); + /* Make sure the status update is visible before we complete */ + smp_wmb(); set_cpu_online(cpu, true); complete(&cpu_running); @@ -195,7 +237,7 @@ asmlinkage void secondary_start_kernel(void) /* * OK, it's off to the idle thread for us */ - cpu_startup_entry(CPUHP_ONLINE); + cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); } #ifdef CONFIG_HOTPLUG_CPU @@ -313,6 +355,30 @@ void cpu_die(void) } #endif +/* + * Kill the calling secondary CPU, early in bringup before it is turned + * online. + */ +void cpu_die_early(void) +{ + int cpu = smp_processor_id(); + + pr_crit("CPU%d: will not boot\n", cpu); + + /* Mark this CPU absent */ + set_cpu_present(cpu, 0); + +#ifdef CONFIG_HOTPLUG_CPU + update_cpu_boot_status(CPU_KILL_ME); + /* Check if we can park ourselves */ + if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_die) + cpu_ops[cpu]->cpu_die(cpu); +#endif + update_cpu_boot_status(CPU_STUCK_IN_KERNEL); + + cpu_park_loop(); +} + static void __init hyp_mode_check(void) { if (is_hyp_mode_available()) @@ -445,6 +511,17 @@ acpi_map_gic_cpu_interface(struct acpi_madt_generic_interrupt *processor) /* map the logical cpu id to cpu MPIDR */ cpu_logical_map(cpu_count) = hwid; + /* + * Set-up the ACPI parking protocol cpu entries + * while initializing the cpu_logical_map to + * avoid parsing MADT entries multiple times for + * nothing (ie a valid cpu_logical_map entry should + * contain a valid parking protocol data set to + * initialize the cpu if the parking protocol is + * the only available enable method). + */ + acpi_set_mailbox_entry(cpu_count, processor); + cpu_count++; } @@ -627,6 +704,7 @@ static const char *ipi_types[NR_IPI] __tracepoint_string = { S(IPI_CPU_STOP, "CPU stop interrupts"), S(IPI_TIMER, "Timer broadcast interrupts"), S(IPI_IRQ_WORK, "IRQ work interrupts"), + S(IPI_WAKEUP, "CPU wake-up interrupts"), }; static void smp_cross_call(const struct cpumask *target, unsigned int ipinr) @@ -670,6 +748,13 @@ void arch_send_call_function_single_ipi(int cpu) smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC); } +#ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL +void arch_send_wakeup_ipi_mask(const struct cpumask *mask) +{ + smp_cross_call(mask, IPI_WAKEUP); +} +#endif + #ifdef CONFIG_IRQ_WORK void arch_irq_work_raise(void) { @@ -747,6 +832,14 @@ void handle_IPI(int ipinr, struct pt_regs *regs) break; #endif +#ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL + case IPI_WAKEUP: + WARN_ONCE(!acpi_parking_protocol_valid(cpu), + "CPU%u: Wake-up IPI outside the ACPI parking protocol\n", + cpu); + break; +#endif + default: pr_crit("CPU%u: Unknown IPI message 0x%x\n", cpu, ipinr); break; |