4 * SMP support for the SuperH processors.
6 * Copyright (C) 2002 - 2008 Paul Mundt
7 * Copyright (C) 2006 - 2007 Akio Idehara
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file "COPYING" in the main directory of this archive
13 #include <linux/err.h>
14 #include <linux/cache.h>
15 #include <linux/cpumask.h>
16 #include <linux/delay.h>
17 #include <linux/init.h>
18 #include <linux/spinlock.h>
20 #include <linux/module.h>
21 #include <linux/cpu.h>
22 #include <linux/interrupt.h>
23 #include <asm/atomic.h>
24 #include <asm/processor.h>
25 #include <asm/system.h>
26 #include <asm/mmu_context.h>
28 #include <asm/cacheflush.h>
29 #include <asm/sections.h>
31 int __cpu_number_map[NR_CPUS]; /* Map physical to logical */
32 int __cpu_logical_map[NR_CPUS]; /* Map logical to physical */
34 static inline void __init smp_store_cpu_info(unsigned int cpu)
36 struct sh_cpuinfo *c = cpu_data + cpu;
38 memcpy(c, &boot_cpu_data, sizeof(struct sh_cpuinfo));
40 c->loops_per_jiffy = loops_per_jiffy;
43 void __init smp_prepare_cpus(unsigned int max_cpus)
45 unsigned int cpu = smp_processor_id();
47 init_new_context(current, &init_mm);
48 current_thread_info()->cpu = cpu;
49 plat_prepare_cpus(max_cpus);
51 #ifndef CONFIG_HOTPLUG_CPU
52 init_cpu_present(&cpu_possible_map);
56 void __devinit smp_prepare_boot_cpu(void)
58 unsigned int cpu = smp_processor_id();
60 __cpu_number_map[0] = cpu;
61 __cpu_logical_map[0] = cpu;
63 set_cpu_online(cpu, true);
64 set_cpu_possible(cpu, true);
67 asmlinkage void __cpuinit start_secondary(void)
70 struct mm_struct *mm = &init_mm;
72 atomic_inc(&mm->mm_count);
73 atomic_inc(&mm->mm_users);
74 current->active_mm = mm;
76 enter_lazy_tlb(mm, current);
82 notify_cpu_starting(smp_processor_id());
86 cpu = smp_processor_id();
88 /* Enable local timers */
89 local_timer_setup(cpu);
92 smp_store_cpu_info(cpu);
94 cpu_set(cpu, cpu_online_map);
101 unsigned long bss_start;
102 unsigned long bss_end;
103 void *start_kernel_fn;
108 int __cpuinit __cpu_up(unsigned int cpu)
110 struct task_struct *tsk;
111 unsigned long timeout;
113 tsk = fork_idle(cpu);
115 printk(KERN_ERR "Failed forking idle task for cpu %d\n", cpu);
119 /* Fill in data in head.S for secondary cpus */
120 stack_start.sp = tsk->thread.sp;
121 stack_start.thread_info = tsk->stack;
122 stack_start.bss_start = 0; /* don't clear bss for secondary cpus */
123 stack_start.start_kernel_fn = start_secondary;
127 plat_start_cpu(cpu, (unsigned long)_stext);
129 timeout = jiffies + HZ;
130 while (time_before(jiffies, timeout)) {
143 void __init smp_cpus_done(unsigned int max_cpus)
145 unsigned long bogosum = 0;
148 for_each_online_cpu(cpu)
149 bogosum += cpu_data[cpu].loops_per_jiffy;
151 printk(KERN_INFO "SMP: Total of %d processors activated "
152 "(%lu.%02lu BogoMIPS).\n", num_online_cpus(),
153 bogosum / (500000/HZ),
154 (bogosum / (5000/HZ)) % 100);
157 void smp_send_reschedule(int cpu)
159 plat_send_ipi(cpu, SMP_MSG_RESCHEDULE);
162 static void stop_this_cpu(void *unused)
164 cpu_clear(smp_processor_id(), cpu_online_map);
171 void smp_send_stop(void)
173 smp_call_function(stop_this_cpu, 0, 0);
176 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
180 for_each_cpu(cpu, mask)
181 plat_send_ipi(cpu, SMP_MSG_FUNCTION);
184 void arch_send_call_function_single_ipi(int cpu)
186 plat_send_ipi(cpu, SMP_MSG_FUNCTION_SINGLE);
189 void smp_timer_broadcast(const struct cpumask *mask)
193 for_each_cpu(cpu, mask)
194 plat_send_ipi(cpu, SMP_MSG_TIMER);
197 static void ipi_timer(void)
200 local_timer_interrupt();
204 void smp_message_recv(unsigned int msg)
207 case SMP_MSG_FUNCTION:
208 generic_smp_call_function_interrupt();
210 case SMP_MSG_RESCHEDULE:
212 case SMP_MSG_FUNCTION_SINGLE:
213 generic_smp_call_function_single_interrupt();
219 printk(KERN_WARNING "SMP %d: %s(): unknown IPI %d\n",
220 smp_processor_id(), __func__, msg);
225 /* Not really SMP stuff ... */
226 int setup_profiling_timer(unsigned int multiplier)
231 static void flush_tlb_all_ipi(void *info)
233 local_flush_tlb_all();
236 void flush_tlb_all(void)
238 on_each_cpu(flush_tlb_all_ipi, 0, 1);
241 static void flush_tlb_mm_ipi(void *mm)
243 local_flush_tlb_mm((struct mm_struct *)mm);
247 * The following tlb flush calls are invoked when old translations are
248 * being torn down, or pte attributes are changing. For single threaded
249 * address spaces, a new context is obtained on the current cpu, and tlb
250 * context on other cpus are invalidated to force a new context allocation
251 * at switch_mm time, should the mm ever be used on other cpus. For
252 * multithreaded address spaces, intercpu interrupts have to be sent.
253 * Another case where intercpu interrupts are required is when the target
254 * mm might be active on another cpu (eg debuggers doing the flushes on
255 * behalf of debugees, kswapd stealing pages from another process etc).
259 void flush_tlb_mm(struct mm_struct *mm)
263 if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
264 smp_call_function(flush_tlb_mm_ipi, (void *)mm, 1);
267 for (i = 0; i < num_online_cpus(); i++)
268 if (smp_processor_id() != i)
269 cpu_context(i, mm) = 0;
271 local_flush_tlb_mm(mm);
276 struct flush_tlb_data {
277 struct vm_area_struct *vma;
282 static void flush_tlb_range_ipi(void *info)
284 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
286 local_flush_tlb_range(fd->vma, fd->addr1, fd->addr2);
289 void flush_tlb_range(struct vm_area_struct *vma,
290 unsigned long start, unsigned long end)
292 struct mm_struct *mm = vma->vm_mm;
295 if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
296 struct flush_tlb_data fd;
301 smp_call_function(flush_tlb_range_ipi, (void *)&fd, 1);
304 for (i = 0; i < num_online_cpus(); i++)
305 if (smp_processor_id() != i)
306 cpu_context(i, mm) = 0;
308 local_flush_tlb_range(vma, start, end);
312 static void flush_tlb_kernel_range_ipi(void *info)
314 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
316 local_flush_tlb_kernel_range(fd->addr1, fd->addr2);
319 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
321 struct flush_tlb_data fd;
325 on_each_cpu(flush_tlb_kernel_range_ipi, (void *)&fd, 1);
328 static void flush_tlb_page_ipi(void *info)
330 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
332 local_flush_tlb_page(fd->vma, fd->addr1);
335 void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
338 if ((atomic_read(&vma->vm_mm->mm_users) != 1) ||
339 (current->mm != vma->vm_mm)) {
340 struct flush_tlb_data fd;
344 smp_call_function(flush_tlb_page_ipi, (void *)&fd, 1);
347 for (i = 0; i < num_online_cpus(); i++)
348 if (smp_processor_id() != i)
349 cpu_context(i, vma->vm_mm) = 0;
351 local_flush_tlb_page(vma, page);
355 static void flush_tlb_one_ipi(void *info)
357 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
358 local_flush_tlb_one(fd->addr1, fd->addr2);
361 void flush_tlb_one(unsigned long asid, unsigned long vaddr)
363 struct flush_tlb_data fd;
368 smp_call_function(flush_tlb_one_ipi, (void *)&fd, 1);
369 local_flush_tlb_one(asid, vaddr);