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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * arch/sh/kernel/smp.c
3 *
4 * SMP support for the SuperH processors.
5 *
Paul Mundtaba10302007-09-21 18:32:32 +09006 * Copyright (C) 2002 - 2007 Paul Mundt
7 * Copyright (C) 2006 - 2007 Akio Idehara
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
Paul Mundtaba10302007-09-21 18:32:32 +09009 * 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
11 * for more details.
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 */
Evgeniy Polyakov66c52272007-05-31 13:46:21 +090013#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/cache.h>
15#include <linux/cpumask.h>
16#include <linux/delay.h>
17#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/spinlock.h>
Paul Mundtaba10302007-09-21 18:32:32 +090019#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/module.h>
Paul Mundtaba10302007-09-21 18:32:32 +090021#include <linux/interrupt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <asm/atomic.h>
23#include <asm/processor.h>
24#include <asm/system.h>
25#include <asm/mmu_context.h>
26#include <asm/smp.h>
Paul Mundtaba10302007-09-21 18:32:32 +090027#include <asm/cacheflush.h>
28#include <asm/sections.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Paul Mundtaba10302007-09-21 18:32:32 +090030int __cpu_number_map[NR_CPUS]; /* Map physical to logical */
31int __cpu_logical_map[NR_CPUS]; /* Map logical to physical */
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
33cpumask_t cpu_possible_map;
David S. Millerc8923c62005-10-13 14:41:23 -070034EXPORT_SYMBOL(cpu_possible_map);
35
Linus Torvalds1da177e2005-04-16 15:20:36 -070036cpumask_t cpu_online_map;
Greg Bankse16b38f2006-10-02 02:17:40 -070037EXPORT_SYMBOL(cpu_online_map);
Paul Mundtaba10302007-09-21 18:32:32 +090038
Linus Torvalds1da177e2005-04-16 15:20:36 -070039static inline void __init smp_store_cpu_info(unsigned int cpu)
40{
Paul Mundtaba10302007-09-21 18:32:32 +090041 struct sh_cpuinfo *c = cpu_data + cpu;
42
43 c->loops_per_jiffy = loops_per_jiffy;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044}
45
46void __init smp_prepare_cpus(unsigned int max_cpus)
47{
48 unsigned int cpu = smp_processor_id();
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Paul Mundtaba10302007-09-21 18:32:32 +090050 init_new_context(current, &init_mm);
51 current_thread_info()->cpu = cpu;
52 plat_prepare_cpus(max_cpus);
53
54#ifndef CONFIG_HOTPLUG_CPU
55 cpu_present_map = cpu_possible_map;
56#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070057}
58
59void __devinit smp_prepare_boot_cpu(void)
60{
61 unsigned int cpu = smp_processor_id();
62
Paul Mundtaba10302007-09-21 18:32:32 +090063 __cpu_number_map[0] = cpu;
64 __cpu_logical_map[0] = cpu;
65
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 cpu_set(cpu, cpu_online_map);
67 cpu_set(cpu, cpu_possible_map);
68}
69
Paul Mundtaba10302007-09-21 18:32:32 +090070asmlinkage void __cpuinit start_secondary(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071{
Paul Mundtaba10302007-09-21 18:32:32 +090072 unsigned int cpu;
73 struct mm_struct *mm = &init_mm;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Paul Mundtaba10302007-09-21 18:32:32 +090075 atomic_inc(&mm->mm_count);
76 atomic_inc(&mm->mm_users);
77 current->active_mm = mm;
78 BUG_ON(current->mm);
79 enter_lazy_tlb(mm, current);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Paul Mundtaba10302007-09-21 18:32:32 +090081 per_cpu_trap_init();
82
83 preempt_disable();
84
85 local_irq_enable();
86
87 calibrate_delay();
88
89 cpu = smp_processor_id();
90 smp_store_cpu_info(cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
92 cpu_set(cpu, cpu_online_map);
93
Paul Mundtaba10302007-09-21 18:32:32 +090094 cpu_idle();
Linus Torvalds1da177e2005-04-16 15:20:36 -070095}
96
Paul Mundtaba10302007-09-21 18:32:32 +090097extern struct {
98 unsigned long sp;
99 unsigned long bss_start;
100 unsigned long bss_end;
101 void *start_kernel_fn;
102 void *cpu_init_fn;
103 void *thread_info;
104} stack_start;
105
106int __cpuinit __cpu_up(unsigned int cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107{
Paul Mundtaba10302007-09-21 18:32:32 +0900108 struct task_struct *tsk;
109 unsigned long timeout;
Nick Piggin5bfb5d62005-11-08 21:39:01 -0800110
Paul Mundtaba10302007-09-21 18:32:32 +0900111 tsk = fork_idle(cpu);
112 if (IS_ERR(tsk)) {
113 printk(KERN_ERR "Failed forking idle task for cpu %d\n", cpu);
114 return PTR_ERR(tsk);
115 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Paul Mundtaba10302007-09-21 18:32:32 +0900117 /* Fill in data in head.S for secondary cpus */
118 stack_start.sp = tsk->thread.sp;
119 stack_start.thread_info = tsk->stack;
120 stack_start.bss_start = 0; /* don't clear bss for secondary cpus */
121 stack_start.start_kernel_fn = start_secondary;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
Paul Mundtaba10302007-09-21 18:32:32 +0900123 flush_cache_all();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
Paul Mundtaba10302007-09-21 18:32:32 +0900125 plat_start_cpu(cpu, (unsigned long)_stext);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
Paul Mundtaba10302007-09-21 18:32:32 +0900127 timeout = jiffies + HZ;
128 while (time_before(jiffies, timeout)) {
129 if (cpu_online(cpu))
130 break;
131
132 udelay(10);
133 }
134
135 if (cpu_online(cpu))
136 return 0;
137
138 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139}
140
141void __init smp_cpus_done(unsigned int max_cpus)
142{
Paul Mundtaba10302007-09-21 18:32:32 +0900143 unsigned long bogosum = 0;
144 int cpu;
145
146 for_each_online_cpu(cpu)
147 bogosum += cpu_data[cpu].loops_per_jiffy;
148
149 printk(KERN_INFO "SMP: Total of %d processors activated "
150 "(%lu.%02lu BogoMIPS).\n", num_online_cpus(),
151 bogosum / (500000/HZ),
152 (bogosum / (5000/HZ)) % 100);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153}
154
155void smp_send_reschedule(int cpu)
156{
Paul Mundtaba10302007-09-21 18:32:32 +0900157 plat_send_ipi(cpu, SMP_MSG_RESCHEDULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158}
159
160static void stop_this_cpu(void *unused)
161{
162 cpu_clear(smp_processor_id(), cpu_online_map);
163 local_irq_disable();
164
165 for (;;)
166 cpu_relax();
167}
168
169void smp_send_stop(void)
170{
Jens Axboe8691e5a2008-06-06 11:18:06 +0200171 smp_call_function(stop_this_cpu, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172}
173
Jens Axboe490f5de2008-06-10 20:52:59 +0200174void arch_send_call_function_ipi(cpumask_t mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175{
Jens Axboe490f5de2008-06-10 20:52:59 +0200176 int cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
Jens Axboe490f5de2008-06-10 20:52:59 +0200178 for_each_cpu_mask(cpu, mask)
179 plat_send_ipi(cpu, SMP_MSG_FUNCTION);
180}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Jens Axboe490f5de2008-06-10 20:52:59 +0200182void arch_send_call_function_single_ipi(int cpu)
183{
184 plat_send_ipi(cpu, SMP_MSG_FUNCTION_SINGLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185}
186
187/* Not really SMP stuff ... */
188int setup_profiling_timer(unsigned int multiplier)
189{
190 return 0;
191}
192
Paul Mundt9964fa82007-09-21 18:09:55 +0900193static void flush_tlb_all_ipi(void *info)
194{
195 local_flush_tlb_all();
196}
197
198void flush_tlb_all(void)
199{
Jens Axboe15c8b6c2008-05-09 09:39:44 +0200200 on_each_cpu(flush_tlb_all_ipi, 0, 1);
Paul Mundt9964fa82007-09-21 18:09:55 +0900201}
202
203static void flush_tlb_mm_ipi(void *mm)
204{
205 local_flush_tlb_mm((struct mm_struct *)mm);
206}
207
208/*
209 * The following tlb flush calls are invoked when old translations are
210 * being torn down, or pte attributes are changing. For single threaded
211 * address spaces, a new context is obtained on the current cpu, and tlb
212 * context on other cpus are invalidated to force a new context allocation
213 * at switch_mm time, should the mm ever be used on other cpus. For
214 * multithreaded address spaces, intercpu interrupts have to be sent.
215 * Another case where intercpu interrupts are required is when the target
216 * mm might be active on another cpu (eg debuggers doing the flushes on
217 * behalf of debugees, kswapd stealing pages from another process etc).
218 * Kanoj 07/00.
219 */
220
221void flush_tlb_mm(struct mm_struct *mm)
222{
223 preempt_disable();
224
225 if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
Jens Axboe8691e5a2008-06-06 11:18:06 +0200226 smp_call_function(flush_tlb_mm_ipi, (void *)mm, 1);
Paul Mundt9964fa82007-09-21 18:09:55 +0900227 } else {
228 int i;
229 for (i = 0; i < num_online_cpus(); i++)
230 if (smp_processor_id() != i)
231 cpu_context(i, mm) = 0;
232 }
233 local_flush_tlb_mm(mm);
234
235 preempt_enable();
236}
237
238struct flush_tlb_data {
239 struct vm_area_struct *vma;
240 unsigned long addr1;
241 unsigned long addr2;
242};
243
244static void flush_tlb_range_ipi(void *info)
245{
246 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
247
248 local_flush_tlb_range(fd->vma, fd->addr1, fd->addr2);
249}
250
251void flush_tlb_range(struct vm_area_struct *vma,
252 unsigned long start, unsigned long end)
253{
254 struct mm_struct *mm = vma->vm_mm;
255
256 preempt_disable();
257 if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
258 struct flush_tlb_data fd;
259
260 fd.vma = vma;
261 fd.addr1 = start;
262 fd.addr2 = end;
Jens Axboe8691e5a2008-06-06 11:18:06 +0200263 smp_call_function(flush_tlb_range_ipi, (void *)&fd, 1);
Paul Mundt9964fa82007-09-21 18:09:55 +0900264 } else {
265 int i;
266 for (i = 0; i < num_online_cpus(); i++)
267 if (smp_processor_id() != i)
268 cpu_context(i, mm) = 0;
269 }
270 local_flush_tlb_range(vma, start, end);
271 preempt_enable();
272}
273
274static void flush_tlb_kernel_range_ipi(void *info)
275{
276 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
277
278 local_flush_tlb_kernel_range(fd->addr1, fd->addr2);
279}
280
281void flush_tlb_kernel_range(unsigned long start, unsigned long end)
282{
283 struct flush_tlb_data fd;
284
285 fd.addr1 = start;
286 fd.addr2 = end;
Jens Axboe15c8b6c2008-05-09 09:39:44 +0200287 on_each_cpu(flush_tlb_kernel_range_ipi, (void *)&fd, 1);
Paul Mundt9964fa82007-09-21 18:09:55 +0900288}
289
290static void flush_tlb_page_ipi(void *info)
291{
292 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
293
294 local_flush_tlb_page(fd->vma, fd->addr1);
295}
296
297void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
298{
299 preempt_disable();
300 if ((atomic_read(&vma->vm_mm->mm_users) != 1) ||
301 (current->mm != vma->vm_mm)) {
302 struct flush_tlb_data fd;
303
304 fd.vma = vma;
305 fd.addr1 = page;
Jens Axboe8691e5a2008-06-06 11:18:06 +0200306 smp_call_function(flush_tlb_page_ipi, (void *)&fd, 1);
Paul Mundt9964fa82007-09-21 18:09:55 +0900307 } else {
308 int i;
309 for (i = 0; i < num_online_cpus(); i++)
310 if (smp_processor_id() != i)
311 cpu_context(i, vma->vm_mm) = 0;
312 }
313 local_flush_tlb_page(vma, page);
314 preempt_enable();
315}
316
317static void flush_tlb_one_ipi(void *info)
318{
319 struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
320 local_flush_tlb_one(fd->addr1, fd->addr2);
321}
322
323void flush_tlb_one(unsigned long asid, unsigned long vaddr)
324{
325 struct flush_tlb_data fd;
326
327 fd.addr1 = asid;
328 fd.addr2 = vaddr;
329
Jens Axboe8691e5a2008-06-06 11:18:06 +0200330 smp_call_function(flush_tlb_one_ipi, (void *)&fd, 1);
Paul Mundt9964fa82007-09-21 18:09:55 +0900331 local_flush_tlb_one(asid, vaddr);
332}