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;
73 atomic_inc(&mm->mm_count);
74 atomic_inc(&mm->mm_users);
75 current->active_mm = mm;
77 enter_lazy_tlb(mm, current);
83 notify_cpu_starting(smp_processor_id());
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;
126 flush_icache_range((unsigned long)&stack_start,
127 (unsigned long)&stack_start + sizeof(stack_start));
130 plat_start_cpu(cpu, (unsigned long)_stext);
132 timeout = jiffies + HZ;
133 while (time_before(jiffies, timeout)) {
146 void __init smp_cpus_done(unsigned int max_cpus)
148 unsigned long bogosum = 0;
151 for_each_online_cpu(cpu)
152 bogosum += cpu_data[cpu].loops_per_jiffy;
154 printk(KERN_INFO "SMP: Total of %d processors activated "
155 "(%lu.%02lu BogoMIPS).\n", num_online_cpus(),
156 bogosum / (500000/HZ),
157 (bogosum / (5000/HZ)) % 100);
160 void smp_send_reschedule(int cpu)
162 plat_send_ipi(cpu, SMP_MSG_RESCHEDULE);
165 void smp_send_stop(void)
167 smp_call_function(stop_this_cpu, 0, 0);
170 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
174 for_each_cpu(cpu, mask)
175 plat_send_ipi(cpu, SMP_MSG_FUNCTION);
178 void arch_send_call_function_single_ipi(int cpu)
180 plat_send_ipi(cpu, SMP_MSG_FUNCTION_SINGLE);
183 void smp_timer_broadcast(const struct cpumask *mask)
187 for_each_cpu(cpu, mask)
188 plat_send_ipi(cpu, SMP_MSG_TIMER);
191 static void ipi_timer(void)
194 local_timer_interrupt();
198 void smp_message_recv(unsigned int msg)
201 case SMP_MSG_FUNCTION:
202 generic_smp_call_function_interrupt();
204 case SMP_MSG_RESCHEDULE:
206 case SMP_MSG_FUNCTION_SINGLE:
207 generic_smp_call_function_single_interrupt();
213 printk(KERN_WARNING "SMP %d: %s(): unknown IPI %d\n",
214 smp_processor_id(), __func__, msg);
219 /* Not really SMP stuff ... */
220 int setup_profiling_timer(unsigned int multiplier)
225 static void flush_tlb_all_ipi(void *info)
227 local_flush_tlb_all();
230 void flush_tlb_all(void)
232 on_each_cpu(flush_tlb_all_ipi, 0, 1);
235 static void flush_tlb_mm_ipi(void *mm)
237 local_flush_tlb_mm((struct mm_struct *)mm);
241 * The following tlb flush calls are invoked when old translations are
242 * being torn down, or pte attributes are changing. For single threaded
243 * address spaces, a new context is obtained on the current cpu, and tlb
244 * context on other cpus are invalidated to force a new context allocation
245 * at switch_mm time, should the mm ever be used on other cpus. For
246 * multithreaded address spaces, intercpu interrupts have to be sent.
247 * Another case where intercpu interrupts are required is when the target
248 * mm might be active on another cpu (eg debuggers doing the flushes on
249 * behalf of debugees, kswapd stealing pages from another process etc).
253 void flush_tlb_mm(struct mm_struct *mm)
257 if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
258 smp_call_function(flush_tlb_mm_ipi, (void *)mm, 1);
261 for (i = 0; i < num_online_cpus(); i++)
262 if (smp_processor_id() != i)
263 cpu_context(i, mm) = 0;
265 local_flush_tlb_mm(mm);
270 struct flush_tlb_data {
271 struct vm_area_struct *vma;
276 static void flush_tlb_range_ipi(void *info)
278 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
280 local_flush_tlb_range(fd->vma, fd->addr1, fd->addr2);
283 void flush_tlb_range(struct vm_area_struct *vma,
284 unsigned long start, unsigned long end)
286 struct mm_struct *mm = vma->vm_mm;
289 if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
290 struct flush_tlb_data fd;
295 smp_call_function(flush_tlb_range_ipi, (void *)&fd, 1);
298 for (i = 0; i < num_online_cpus(); i++)
299 if (smp_processor_id() != i)
300 cpu_context(i, mm) = 0;
302 local_flush_tlb_range(vma, start, end);
306 static void flush_tlb_kernel_range_ipi(void *info)
308 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
310 local_flush_tlb_kernel_range(fd->addr1, fd->addr2);
313 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
315 struct flush_tlb_data fd;
319 on_each_cpu(flush_tlb_kernel_range_ipi, (void *)&fd, 1);
322 static void flush_tlb_page_ipi(void *info)
324 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
326 local_flush_tlb_page(fd->vma, fd->addr1);
329 void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
332 if ((atomic_read(&vma->vm_mm->mm_users) != 1) ||
333 (current->mm != vma->vm_mm)) {
334 struct flush_tlb_data fd;
338 smp_call_function(flush_tlb_page_ipi, (void *)&fd, 1);
341 for (i = 0; i < num_online_cpus(); i++)
342 if (smp_processor_id() != i)
343 cpu_context(i, vma->vm_mm) = 0;
345 local_flush_tlb_page(vma, page);
349 static void flush_tlb_one_ipi(void *info)
351 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
352 local_flush_tlb_one(fd->addr1, fd->addr2);
355 void flush_tlb_one(unsigned long asid, unsigned long vaddr)
357 struct flush_tlb_data fd;
362 smp_call_function(flush_tlb_one_ipi, (void *)&fd, 1);
363 local_flush_tlb_one(asid, vaddr);