// SPDX-License-Identifier: GPL-2.0/* * arch/sh/kernel/smp.c * * SMP support for the SuperH processors. * * Copyright (C) 2002 - 2010 Paul Mundt * Copyright (C) 2006 - 2007 Akio Idehara */#include <linux/err.h>#include <linux/cache.h>#include <linux/cpumask.h>#include <linux/delay.h>#include <linux/init.h>#include <linux/spinlock.h>#include <linux/mm.h>#include <linux/module.h>#include <linux/cpu.h>#include <linux/interrupt.h>#include <linux/sched/mm.h>#include <linux/sched/hotplug.h>#include <linux/atomic.h>#include <linux/clockchips.h>#include <linux/profile.h> #include <asm/processor.h>#include <asm/mmu_context.h>#include <asm/smp.h>#include <asm/cacheflush.h>#include <asm/sections.h>#include <asm/setup.h> int __cpu_number_map[NR_CPUS];		/* Map physical to logical */int __cpu_logical_map[NR_CPUS];		/* Map logical to physical */ struct plat_smp_ops *mp_ops = NULL; /* State of each CPU */DEFINE_PER_CPU(int, cpu_state) = { 0 }; void register_smp_ops(struct plat_smp_ops *ops){	if (mp_ops)		printk(KERN_WARNING "Overriding previously set SMP ops\n"); 	mp_ops = ops;} static inline void smp_store_cpu_info(unsigned int cpu){	struct sh_cpuinfo *c = cpu_data + cpu; 	memcpy(c, &boot_cpu_data, sizeof(struct sh_cpuinfo)); 	c->loops_per_jiffy = loops_per_jiffy;} void __init smp_prepare_cpus(unsigned int max_cpus){	unsigned int cpu = smp_processor_id(); 	init_new_context(current, &init_mm);	current_thread_info()->cpu = cpu;	mp_ops->prepare_cpus(max_cpus); #ifndef CONFIG_HOTPLUG_CPU	init_cpu_present(cpu_possible_mask);#endif} void __init smp_prepare_boot_cpu(void){	unsigned int cpu = smp_processor_id(); 	__cpu_number_map[0] = cpu;	__cpu_logical_map[0] = cpu; 	set_cpu_online(cpu, true);	set_cpu_possible(cpu, true); 	per_cpu(cpu_state, cpu) = CPU_ONLINE;} #ifdef CONFIG_HOTPLUG_CPUvoid native_cpu_die(unsigned int cpu){	unsigned int i; 	for (i = 0; i < 10; i++) {		smp_rmb();		if (per_cpu(cpu_state, cpu) == CPU_DEAD) {			if (system_state == SYSTEM_RUNNING)				pr_info("CPU %u is now offline\n", cpu); 			return;		} 		msleep(100);	} 	pr_err("CPU %u didn't die...\n", cpu);} int native_cpu_disable(unsigned int cpu){	return cpu == 0 ? -EPERM : 0;} void play_dead_common(void){	idle_task_exit();	irq_ctx_exit(raw_smp_processor_id());	mb(); 	__this_cpu_write(cpu_state, CPU_DEAD);	local_irq_disable();} void native_play_dead(void){	play_dead_common();} int __cpu_disable(void){	unsigned int cpu = smp_processor_id();	int ret; 	ret = mp_ops->cpu_disable(cpu);	if (ret)		return ret; 	/*	 * Take this CPU offline.  Once we clear this, we can't return,	 * and we must not schedule until we're ready to give up the cpu.	 */	set_cpu_online(cpu, false); 	/*	 * OK - migrate IRQs away from this CPU	 */	migrate_irqs(); 	/*	 * Flush user cache and TLB mappings, and then remove this CPU	 * from the vm mask set of all processes.	 */	flush_cache_all();#ifdef CONFIG_MMU	local_flush_tlb_all();#endif 	clear_tasks_mm_cpumask(cpu); 	return 0;}#else /* ... !CONFIG_HOTPLUG_CPU */int native_cpu_disable(unsigned int cpu){	return -ENOSYS;} void native_cpu_die(unsigned int cpu){	/* We said "no" in __cpu_disable */	BUG();} void native_play_dead(void){	BUG();}#endif static asmlinkage void start_secondary(void){	unsigned int cpu = smp_processor_id();	struct mm_struct *mm = &init_mm; 	enable_mmu();	mmgrab(mm);	mmget(mm);	current->active_mm = mm;#ifdef CONFIG_MMU	enter_lazy_tlb(mm, current);	local_flush_tlb_all();#endif 	per_cpu_trap_init(); 	notify_cpu_starting(cpu); 	local_irq_enable(); 	calibrate_delay(); 	smp_store_cpu_info(cpu); 	set_cpu_online(cpu, true);	per_cpu(cpu_state, cpu) = CPU_ONLINE; 	cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);} extern struct {	unsigned long sp;	unsigned long bss_start;	unsigned long bss_end;	void *start_kernel_fn;	void *cpu_init_fn;	void *thread_info;} stack_start; int __cpu_up(unsigned int cpu, struct task_struct *tsk){	unsigned long timeout; 	per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; 	/* Fill in data in head.S for secondary cpus */	stack_start.sp = tsk->thread.sp;	stack_start.thread_info = tsk->stack;	stack_start.bss_start = 0; /* don't clear bss for secondary cpus */	stack_start.start_kernel_fn = start_secondary; 	flush_icache_range((unsigned long)&stack_start,			   (unsigned long)&stack_start + sizeof(stack_start));	wmb(); 	mp_ops->start_cpu(cpu, (unsigned long)_stext); 	timeout = jiffies + HZ;	while (time_before(jiffies, timeout)) {		if (cpu_online(cpu))			break; 		udelay(10);		barrier();	} 	if (cpu_online(cpu))		return 0; 	return -ENOENT;} void __init smp_cpus_done(unsigned int max_cpus){	unsigned long bogosum = 0;	int cpu; 	for_each_online_cpu(cpu)		bogosum += cpu_data[cpu].loops_per_jiffy; 	printk(KERN_INFO "SMP: Total of %d processors activated "	       "(%lu.%02lu BogoMIPS).\n", num_online_cpus(),	       bogosum / (500000/HZ),	       (bogosum / (5000/HZ)) % 100);} void arch_smp_send_reschedule(int cpu){	mp_ops->send_ipi(cpu, SMP_MSG_RESCHEDULE);} void smp_send_stop(void){	smp_call_function(stop_this_cpu, 0, 0);} void arch_send_call_function_ipi_mask(const struct cpumask *mask){	int cpu; 	for_each_cpu(cpu, mask)		mp_ops->send_ipi(cpu, SMP_MSG_FUNCTION);} void arch_send_call_function_single_ipi(int cpu){	mp_ops->send_ipi(cpu, SMP_MSG_FUNCTION_SINGLE);} #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCASTvoid tick_broadcast(const struct cpumask *mask){	int cpu; 	for_each_cpu(cpu, mask)		mp_ops->send_ipi(cpu, SMP_MSG_TIMER);} static void ipi_timer(void){	irq_enter();	tick_receive_broadcast();	irq_exit();}#endif void smp_message_recv(unsigned int msg){	switch (msg) {	case SMP_MSG_FUNCTION:		generic_smp_call_function_interrupt();		break;	case SMP_MSG_RESCHEDULE:		scheduler_ipi();		break;	case SMP_MSG_FUNCTION_SINGLE:		generic_smp_call_function_single_interrupt();		break;#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST	case SMP_MSG_TIMER:		ipi_timer();		break;#endif	default:		printk(KERN_WARNING "SMP %d: %s(): unknown IPI %d\n",		       smp_processor_id(), __func__, msg);		break;	}} #ifdef CONFIG_PROFILING/* Not really SMP stuff ... */int setup_profiling_timer(unsigned int multiplier){	return 0;}#endif #ifdef CONFIG_MMU static void flush_tlb_all_ipi(void *info){	local_flush_tlb_all();} void flush_tlb_all(void){	on_each_cpu(flush_tlb_all_ipi, 0, 1);} static void flush_tlb_mm_ipi(void *mm){	local_flush_tlb_mm((struct mm_struct *)mm);} /* * The following tlb flush calls are invoked when old translations are * being torn down, or pte attributes are changing. For single threaded * address spaces, a new context is obtained on the current cpu, and tlb * context on other cpus are invalidated to force a new context allocation * at switch_mm time, should the mm ever be used on other cpus. For * multithreaded address spaces, intercpu interrupts have to be sent. * Another case where intercpu interrupts are required is when the target * mm might be active on another cpu (eg debuggers doing the flushes on * behalf of debugees, kswapd stealing pages from another process etc). * Kanoj 07/00. */void flush_tlb_mm(struct mm_struct *mm){	preempt_disable(); 	if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {		smp_call_function(flush_tlb_mm_ipi, (void *)mm, 1);	} else {		int i;		for_each_online_cpu(i)			if (smp_processor_id() != i)				cpu_context(i, mm) = 0;	}	local_flush_tlb_mm(mm); 	preempt_enable();} struct flush_tlb_data {	struct vm_area_struct *vma;	unsigned long addr1;	unsigned long addr2;}; static void flush_tlb_range_ipi(void *info){	struct flush_tlb_data *fd = (struct flush_tlb_data *)info; 	local_flush_tlb_range(fd->vma, fd->addr1, fd->addr2);} void flush_tlb_range(struct vm_area_struct *vma,		     unsigned long start, unsigned long end){	struct mm_struct *mm = vma->vm_mm; 	preempt_disable();	if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {		struct flush_tlb_data fd; 		fd.vma = vma;		fd.addr1 = start;		fd.addr2 = end;		smp_call_function(flush_tlb_range_ipi, (void *)&fd, 1);	} else {		int i;		for_each_online_cpu(i)			if (smp_processor_id() != i)				cpu_context(i, mm) = 0;	}	local_flush_tlb_range(vma, start, end);	preempt_enable();} static void flush_tlb_kernel_range_ipi(void *info){	struct flush_tlb_data *fd = (struct flush_tlb_data *)info; 	local_flush_tlb_kernel_range(fd->addr1, fd->addr2);} void flush_tlb_kernel_range(unsigned long start, unsigned long end){	struct flush_tlb_data fd; 	fd.addr1 = start;	fd.addr2 = end;	on_each_cpu(flush_tlb_kernel_range_ipi, (void *)&fd, 1);} static void flush_tlb_page_ipi(void *info){	struct flush_tlb_data *fd = (struct flush_tlb_data *)info; 	local_flush_tlb_page(fd->vma, fd->addr1);} void flush_tlb_page(struct vm_area_struct *vma, unsigned long page){	preempt_disable();	if ((atomic_read(&vma->vm_mm->mm_users) != 1) ||	    (current->mm != vma->vm_mm)) {		struct flush_tlb_data fd; 		fd.vma = vma;		fd.addr1 = page;		smp_call_function(flush_tlb_page_ipi, (void *)&fd, 1);	} else {		int i;		for_each_online_cpu(i)			if (smp_processor_id() != i)				cpu_context(i, vma->vm_mm) = 0;	}	local_flush_tlb_page(vma, page);	preempt_enable();} static void flush_tlb_one_ipi(void *info){	struct flush_tlb_data *fd = (struct flush_tlb_data *)info;	local_flush_tlb_one(fd->addr1, fd->addr2);} void flush_tlb_one(unsigned long asid, unsigned long vaddr){	struct flush_tlb_data fd; 	fd.addr1 = asid;	fd.addr2 = vaddr; 	smp_call_function(flush_tlb_one_ipi, (void *)&fd, 1);	local_flush_tlb_one(asid, vaddr);} #endif