1 // SPDX-License-Identifier: GPL-2.0
5 * SMP support for the SuperH processors.
7 * Copyright (C) 2002 - 2010 Paul Mundt
8 * Copyright (C) 2006 - 2007 Akio Idehara
10 #include <linux/err.h>
11 #include <linux/cache.h>
12 #include <linux/cpumask.h>
13 #include <linux/delay.h>
14 #include <linux/init.h>
15 #include <linux/spinlock.h>
17 #include <linux/module.h>
18 #include <linux/cpu.h>
19 #include <linux/interrupt.h>
20 #include <linux/sched/mm.h>
21 #include <linux/sched/hotplug.h>
22 #include <linux/atomic.h>
23 #include <linux/clockchips.h>
24 #include <asm/processor.h>
25 #include <asm/mmu_context.h>
27 #include <asm/cacheflush.h>
28 #include <asm/sections.h>
29 #include <asm/setup.h>
31 int __cpu_number_map[NR_CPUS]; /* Map physical to logical */
32 int __cpu_logical_map[NR_CPUS]; /* Map logical to physical */
34 struct plat_smp_ops *mp_ops = NULL;
36 /* State of each CPU */
37 DEFINE_PER_CPU(int, cpu_state) = { 0 };
39 void register_smp_ops(struct plat_smp_ops *ops)
42 printk(KERN_WARNING "Overriding previously set SMP ops\n");
47 static inline void smp_store_cpu_info(unsigned int cpu)
49 struct sh_cpuinfo *c = cpu_data + cpu;
51 memcpy(c, &boot_cpu_data, sizeof(struct sh_cpuinfo));
53 c->loops_per_jiffy = loops_per_jiffy;
56 void __init smp_prepare_cpus(unsigned int max_cpus)
58 unsigned int cpu = smp_processor_id();
60 init_new_context(current, &init_mm);
61 current_thread_info()->cpu = cpu;
62 mp_ops->prepare_cpus(max_cpus);
64 #ifndef CONFIG_HOTPLUG_CPU
65 init_cpu_present(cpu_possible_mask);
69 void __init smp_prepare_boot_cpu(void)
71 unsigned int cpu = smp_processor_id();
73 __cpu_number_map[0] = cpu;
74 __cpu_logical_map[0] = cpu;
76 set_cpu_online(cpu, true);
77 set_cpu_possible(cpu, true);
79 per_cpu(cpu_state, cpu) = CPU_ONLINE;
82 #ifdef CONFIG_HOTPLUG_CPU
83 void native_cpu_die(unsigned int cpu)
87 for (i = 0; i < 10; i++) {
89 if (per_cpu(cpu_state, cpu) == CPU_DEAD) {
90 if (system_state == SYSTEM_RUNNING)
91 pr_info("CPU %u is now offline\n", cpu);
99 pr_err("CPU %u didn't die...\n", cpu);
102 int native_cpu_disable(unsigned int cpu)
104 return cpu == 0 ? -EPERM : 0;
107 void play_dead_common(void)
110 irq_ctx_exit(raw_smp_processor_id());
113 __this_cpu_write(cpu_state, CPU_DEAD);
117 void native_play_dead(void)
122 int __cpu_disable(void)
124 unsigned int cpu = smp_processor_id();
127 ret = mp_ops->cpu_disable(cpu);
132 * Take this CPU offline. Once we clear this, we can't return,
133 * and we must not schedule until we're ready to give up the cpu.
135 set_cpu_online(cpu, false);
138 * OK - migrate IRQs away from this CPU
143 * Flush user cache and TLB mappings, and then remove this CPU
144 * from the vm mask set of all processes.
148 local_flush_tlb_all();
151 clear_tasks_mm_cpumask(cpu);
155 #else /* ... !CONFIG_HOTPLUG_CPU */
156 int native_cpu_disable(unsigned int cpu)
161 void native_cpu_die(unsigned int cpu)
163 /* We said "no" in __cpu_disable */
167 void native_play_dead(void)
173 asmlinkage void start_secondary(void)
175 unsigned int cpu = smp_processor_id();
176 struct mm_struct *mm = &init_mm;
181 current->active_mm = mm;
183 enter_lazy_tlb(mm, current);
184 local_flush_tlb_all();
189 notify_cpu_starting(cpu);
195 smp_store_cpu_info(cpu);
197 set_cpu_online(cpu, true);
198 per_cpu(cpu_state, cpu) = CPU_ONLINE;
200 cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
205 unsigned long bss_start;
206 unsigned long bss_end;
207 void *start_kernel_fn;
212 int __cpu_up(unsigned int cpu, struct task_struct *tsk)
214 unsigned long timeout;
216 per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
218 /* Fill in data in head.S for secondary cpus */
219 stack_start.sp = tsk->thread.sp;
220 stack_start.thread_info = tsk->stack;
221 stack_start.bss_start = 0; /* don't clear bss for secondary cpus */
222 stack_start.start_kernel_fn = start_secondary;
224 flush_icache_range((unsigned long)&stack_start,
225 (unsigned long)&stack_start + sizeof(stack_start));
228 mp_ops->start_cpu(cpu, (unsigned long)_stext);
230 timeout = jiffies + HZ;
231 while (time_before(jiffies, timeout)) {
245 void __init smp_cpus_done(unsigned int max_cpus)
247 unsigned long bogosum = 0;
250 for_each_online_cpu(cpu)
251 bogosum += cpu_data[cpu].loops_per_jiffy;
253 printk(KERN_INFO "SMP: Total of %d processors activated "
254 "(%lu.%02lu BogoMIPS).\n", num_online_cpus(),
255 bogosum / (500000/HZ),
256 (bogosum / (5000/HZ)) % 100);
259 void smp_send_reschedule(int cpu)
261 mp_ops->send_ipi(cpu, SMP_MSG_RESCHEDULE);
264 void smp_send_stop(void)
266 smp_call_function(stop_this_cpu, 0, 0);
269 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
273 for_each_cpu(cpu, mask)
274 mp_ops->send_ipi(cpu, SMP_MSG_FUNCTION);
277 void arch_send_call_function_single_ipi(int cpu)
279 mp_ops->send_ipi(cpu, SMP_MSG_FUNCTION_SINGLE);
282 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
283 void tick_broadcast(const struct cpumask *mask)
287 for_each_cpu(cpu, mask)
288 mp_ops->send_ipi(cpu, SMP_MSG_TIMER);
291 static void ipi_timer(void)
294 tick_receive_broadcast();
299 void smp_message_recv(unsigned int msg)
302 case SMP_MSG_FUNCTION:
303 generic_smp_call_function_interrupt();
305 case SMP_MSG_RESCHEDULE:
308 case SMP_MSG_FUNCTION_SINGLE:
309 generic_smp_call_function_single_interrupt();
311 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
317 printk(KERN_WARNING "SMP %d: %s(): unknown IPI %d\n",
318 smp_processor_id(), __func__, msg);
323 /* Not really SMP stuff ... */
324 int setup_profiling_timer(unsigned int multiplier)
331 static void flush_tlb_all_ipi(void *info)
333 local_flush_tlb_all();
336 void flush_tlb_all(void)
338 on_each_cpu(flush_tlb_all_ipi, 0, 1);
341 static void flush_tlb_mm_ipi(void *mm)
343 local_flush_tlb_mm((struct mm_struct *)mm);
347 * The following tlb flush calls are invoked when old translations are
348 * being torn down, or pte attributes are changing. For single threaded
349 * address spaces, a new context is obtained on the current cpu, and tlb
350 * context on other cpus are invalidated to force a new context allocation
351 * at switch_mm time, should the mm ever be used on other cpus. For
352 * multithreaded address spaces, intercpu interrupts have to be sent.
353 * Another case where intercpu interrupts are required is when the target
354 * mm might be active on another cpu (eg debuggers doing the flushes on
355 * behalf of debugees, kswapd stealing pages from another process etc).
358 void flush_tlb_mm(struct mm_struct *mm)
362 if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
363 smp_call_function(flush_tlb_mm_ipi, (void *)mm, 1);
366 for_each_online_cpu(i)
367 if (smp_processor_id() != i)
368 cpu_context(i, mm) = 0;
370 local_flush_tlb_mm(mm);
375 struct flush_tlb_data {
376 struct vm_area_struct *vma;
381 static void flush_tlb_range_ipi(void *info)
383 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
385 local_flush_tlb_range(fd->vma, fd->addr1, fd->addr2);
388 void flush_tlb_range(struct vm_area_struct *vma,
389 unsigned long start, unsigned long end)
391 struct mm_struct *mm = vma->vm_mm;
394 if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
395 struct flush_tlb_data fd;
400 smp_call_function(flush_tlb_range_ipi, (void *)&fd, 1);
403 for_each_online_cpu(i)
404 if (smp_processor_id() != i)
405 cpu_context(i, mm) = 0;
407 local_flush_tlb_range(vma, start, end);
411 static void flush_tlb_kernel_range_ipi(void *info)
413 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
415 local_flush_tlb_kernel_range(fd->addr1, fd->addr2);
418 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
420 struct flush_tlb_data fd;
424 on_each_cpu(flush_tlb_kernel_range_ipi, (void *)&fd, 1);
427 static void flush_tlb_page_ipi(void *info)
429 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
431 local_flush_tlb_page(fd->vma, fd->addr1);
434 void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
437 if ((atomic_read(&vma->vm_mm->mm_users) != 1) ||
438 (current->mm != vma->vm_mm)) {
439 struct flush_tlb_data fd;
443 smp_call_function(flush_tlb_page_ipi, (void *)&fd, 1);
446 for_each_online_cpu(i)
447 if (smp_processor_id() != i)
448 cpu_context(i, vma->vm_mm) = 0;
450 local_flush_tlb_page(vma, page);
454 static void flush_tlb_one_ipi(void *info)
456 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
457 local_flush_tlb_one(fd->addr1, fd->addr2);
460 void flush_tlb_one(unsigned long asid, unsigned long vaddr)
462 struct flush_tlb_data fd;
467 smp_call_function(flush_tlb_one_ipi, (void *)&fd, 1);
468 local_flush_tlb_one(asid, vaddr);