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/interrupt.h>
22 #include <asm/atomic.h>
23 #include <asm/processor.h>
24 #include <asm/system.h>
25 #include <asm/mmu_context.h>
27 #include <asm/cacheflush.h>
28 #include <asm/sections.h>
30 int __cpu_number_map[NR_CPUS]; /* Map physical to logical */
31 int __cpu_logical_map[NR_CPUS]; /* Map logical to physical */
33 cpumask_t cpu_possible_map;
34 EXPORT_SYMBOL(cpu_possible_map);
36 cpumask_t cpu_online_map;
37 EXPORT_SYMBOL(cpu_online_map);
39 static inline void __init smp_store_cpu_info(unsigned int cpu)
41 struct sh_cpuinfo *c = cpu_data + cpu;
43 c->loops_per_jiffy = loops_per_jiffy;
46 void __init smp_prepare_cpus(unsigned int max_cpus)
48 unsigned int cpu = smp_processor_id();
50 init_new_context(current, &init_mm);
51 current_thread_info()->cpu = cpu;
52 plat_prepare_cpus(max_cpus);
54 #ifndef CONFIG_HOTPLUG_CPU
55 cpu_present_map = cpu_possible_map;
59 void __devinit smp_prepare_boot_cpu(void)
61 unsigned int cpu = smp_processor_id();
63 __cpu_number_map[0] = cpu;
64 __cpu_logical_map[0] = cpu;
66 cpu_set(cpu, cpu_online_map);
67 cpu_set(cpu, cpu_possible_map);
70 asmlinkage void __cpuinit start_secondary(void)
73 struct mm_struct *mm = &init_mm;
75 atomic_inc(&mm->mm_count);
76 atomic_inc(&mm->mm_users);
77 current->active_mm = mm;
79 enter_lazy_tlb(mm, current);
87 cpu = smp_processor_id();
89 /* Enable local timers */
90 local_timer_setup(cpu);
93 smp_store_cpu_info(cpu);
95 cpu_set(cpu, cpu_online_map);
102 unsigned long bss_start;
103 unsigned long bss_end;
104 void *start_kernel_fn;
109 int __cpuinit __cpu_up(unsigned int cpu)
111 struct task_struct *tsk;
112 unsigned long timeout;
114 tsk = fork_idle(cpu);
116 printk(KERN_ERR "Failed forking idle task for cpu %d\n", cpu);
120 /* Fill in data in head.S for secondary cpus */
121 stack_start.sp = tsk->thread.sp;
122 stack_start.thread_info = tsk->stack;
123 stack_start.bss_start = 0; /* don't clear bss for secondary cpus */
124 stack_start.start_kernel_fn = start_secondary;
128 plat_start_cpu(cpu, (unsigned long)_stext);
130 timeout = jiffies + HZ;
131 while (time_before(jiffies, timeout)) {
144 void __init smp_cpus_done(unsigned int max_cpus)
146 unsigned long bogosum = 0;
149 for_each_online_cpu(cpu)
150 bogosum += cpu_data[cpu].loops_per_jiffy;
152 printk(KERN_INFO "SMP: Total of %d processors activated "
153 "(%lu.%02lu BogoMIPS).\n", num_online_cpus(),
154 bogosum / (500000/HZ),
155 (bogosum / (5000/HZ)) % 100);
158 void smp_send_reschedule(int cpu)
160 plat_send_ipi(cpu, SMP_MSG_RESCHEDULE);
163 static void stop_this_cpu(void *unused)
165 cpu_clear(smp_processor_id(), cpu_online_map);
172 void smp_send_stop(void)
174 smp_call_function(stop_this_cpu, 0, 0);
177 void arch_send_call_function_ipi(cpumask_t mask)
181 for_each_cpu_mask(cpu, mask)
182 plat_send_ipi(cpu, SMP_MSG_FUNCTION);
185 void arch_send_call_function_single_ipi(int cpu)
187 plat_send_ipi(cpu, SMP_MSG_FUNCTION_SINGLE);
190 void smp_timer_broadcast(cpumask_t mask)
194 for_each_cpu_mask(cpu, mask)
195 plat_send_ipi(cpu, SMP_MSG_TIMER);
198 static void ipi_timer(void)
201 local_timer_interrupt();
205 void smp_message_recv(unsigned int msg)
208 case SMP_MSG_FUNCTION:
209 generic_smp_call_function_interrupt();
211 case SMP_MSG_RESCHEDULE:
213 case SMP_MSG_FUNCTION_SINGLE:
214 generic_smp_call_function_single_interrupt();
220 printk(KERN_WARNING "SMP %d: %s(): unknown IPI %d\n",
221 smp_processor_id(), __func__, msg);
226 /* Not really SMP stuff ... */
227 int setup_profiling_timer(unsigned int multiplier)
232 static void flush_tlb_all_ipi(void *info)
234 local_flush_tlb_all();
237 void flush_tlb_all(void)
239 on_each_cpu(flush_tlb_all_ipi, 0, 1);
242 static void flush_tlb_mm_ipi(void *mm)
244 local_flush_tlb_mm((struct mm_struct *)mm);
248 * The following tlb flush calls are invoked when old translations are
249 * being torn down, or pte attributes are changing. For single threaded
250 * address spaces, a new context is obtained on the current cpu, and tlb
251 * context on other cpus are invalidated to force a new context allocation
252 * at switch_mm time, should the mm ever be used on other cpus. For
253 * multithreaded address spaces, intercpu interrupts have to be sent.
254 * Another case where intercpu interrupts are required is when the target
255 * mm might be active on another cpu (eg debuggers doing the flushes on
256 * behalf of debugees, kswapd stealing pages from another process etc).
260 void flush_tlb_mm(struct mm_struct *mm)
264 if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
265 smp_call_function(flush_tlb_mm_ipi, (void *)mm, 1);
268 for (i = 0; i < num_online_cpus(); i++)
269 if (smp_processor_id() != i)
270 cpu_context(i, mm) = 0;
272 local_flush_tlb_mm(mm);
277 struct flush_tlb_data {
278 struct vm_area_struct *vma;
283 static void flush_tlb_range_ipi(void *info)
285 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
287 local_flush_tlb_range(fd->vma, fd->addr1, fd->addr2);
290 void flush_tlb_range(struct vm_area_struct *vma,
291 unsigned long start, unsigned long end)
293 struct mm_struct *mm = vma->vm_mm;
296 if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
297 struct flush_tlb_data fd;
302 smp_call_function(flush_tlb_range_ipi, (void *)&fd, 1);
305 for (i = 0; i < num_online_cpus(); i++)
306 if (smp_processor_id() != i)
307 cpu_context(i, mm) = 0;
309 local_flush_tlb_range(vma, start, end);
313 static void flush_tlb_kernel_range_ipi(void *info)
315 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
317 local_flush_tlb_kernel_range(fd->addr1, fd->addr2);
320 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
322 struct flush_tlb_data fd;
326 on_each_cpu(flush_tlb_kernel_range_ipi, (void *)&fd, 1);
329 static void flush_tlb_page_ipi(void *info)
331 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
333 local_flush_tlb_page(fd->vma, fd->addr1);
336 void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
339 if ((atomic_read(&vma->vm_mm->mm_users) != 1) ||
340 (current->mm != vma->vm_mm)) {
341 struct flush_tlb_data fd;
345 smp_call_function(flush_tlb_page_ipi, (void *)&fd, 1);
348 for (i = 0; i < num_online_cpus(); i++)
349 if (smp_processor_id() != i)
350 cpu_context(i, vma->vm_mm) = 0;
352 local_flush_tlb_page(vma, page);
356 static void flush_tlb_one_ipi(void *info)
358 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
359 local_flush_tlb_one(fd->addr1, fd->addr2);
362 void flush_tlb_one(unsigned long asid, unsigned long vaddr)
364 struct flush_tlb_data fd;
369 smp_call_function(flush_tlb_one_ipi, (void *)&fd, 1);
370 local_flush_tlb_one(asid, vaddr);