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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * SMP support for ppc. | |
3 | * | |
4 | * Written by Cort Dougan (cort@cs.nmt.edu) borrowing a great | |
5 | * deal of code from the sparc and intel versions. | |
6 | * | |
7 | * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu> | |
8 | * | |
9 | * PowerPC-64 Support added by Dave Engebretsen, Peter Bergner, and | |
10 | * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License | |
14 | * as published by the Free Software Foundation; either version | |
15 | * 2 of the License, or (at your option) any later version. | |
16 | */ | |
17 | ||
18 | #undef DEBUG | |
19 | ||
1da177e4 LT |
20 | #include <linux/kernel.h> |
21 | #include <linux/module.h> | |
22 | #include <linux/sched.h> | |
23 | #include <linux/smp.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/delay.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/spinlock.h> | |
28 | #include <linux/cache.h> | |
29 | #include <linux/err.h> | |
30 | #include <linux/sysdev.h> | |
31 | #include <linux/cpu.h> | |
32 | #include <linux/notifier.h> | |
4b703a23 | 33 | #include <linux/topology.h> |
1da177e4 LT |
34 | |
35 | #include <asm/ptrace.h> | |
36 | #include <asm/atomic.h> | |
37 | #include <asm/irq.h> | |
38 | #include <asm/page.h> | |
39 | #include <asm/pgtable.h> | |
40 | #include <asm/prom.h> | |
41 | #include <asm/smp.h> | |
1da177e4 LT |
42 | #include <asm/time.h> |
43 | #include <asm/machdep.h> | |
44 | #include <asm/cputable.h> | |
45 | #include <asm/system.h> | |
bbeb3f4c | 46 | #include <asm/mpic.h> |
a7f290da | 47 | #include <asm/vdso_datapage.h> |
5ad57078 PM |
48 | #ifdef CONFIG_PPC64 |
49 | #include <asm/paca.h> | |
50 | #endif | |
51 | ||
1da177e4 | 52 | #ifdef DEBUG |
f9e4ec57 | 53 | #include <asm/udbg.h> |
1da177e4 LT |
54 | #define DBG(fmt...) udbg_printf(fmt) |
55 | #else | |
56 | #define DBG(fmt...) | |
57 | #endif | |
58 | ||
f9e4ec57 ME |
59 | int smp_hw_index[NR_CPUS]; |
60 | struct thread_info *secondary_ti; | |
61 | ||
1da177e4 LT |
62 | cpumask_t cpu_possible_map = CPU_MASK_NONE; |
63 | cpumask_t cpu_online_map = CPU_MASK_NONE; | |
d5a7430d | 64 | DEFINE_PER_CPU(cpumask_t, cpu_sibling_map) = CPU_MASK_NONE; |
1da177e4 LT |
65 | |
66 | EXPORT_SYMBOL(cpu_online_map); | |
67 | EXPORT_SYMBOL(cpu_possible_map); | |
d5a7430d | 68 | EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); |
1da177e4 | 69 | |
5ad57078 | 70 | /* SMP operations for this machine */ |
1da177e4 LT |
71 | struct smp_ops_t *smp_ops; |
72 | ||
73 | static volatile unsigned int cpu_callin_map[NR_CPUS]; | |
74 | ||
1da177e4 LT |
75 | void smp_call_function_interrupt(void); |
76 | ||
77 | int smt_enabled_at_boot = 1; | |
78 | ||
e057d985 OJ |
79 | static int ipi_fail_ok; |
80 | ||
cc532915 ME |
81 | static void (*crash_ipi_function_ptr)(struct pt_regs *) = NULL; |
82 | ||
5ad57078 | 83 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
84 | void __devinit smp_generic_kick_cpu(int nr) |
85 | { | |
86 | BUG_ON(nr < 0 || nr >= NR_CPUS); | |
87 | ||
88 | /* | |
89 | * The processor is currently spinning, waiting for the | |
90 | * cpu_start field to become non-zero After we set cpu_start, | |
91 | * the processor will continue on to secondary_start | |
92 | */ | |
93 | paca[nr].cpu_start = 1; | |
0d8d4d42 | 94 | smp_mb(); |
1da177e4 | 95 | } |
5ad57078 | 96 | #endif |
1da177e4 | 97 | |
7d12e780 | 98 | void smp_message_recv(int msg) |
1da177e4 LT |
99 | { |
100 | switch(msg) { | |
101 | case PPC_MSG_CALL_FUNCTION: | |
102 | smp_call_function_interrupt(); | |
103 | break; | |
5ad57078 | 104 | case PPC_MSG_RESCHEDULE: |
1da177e4 LT |
105 | /* XXX Do we have to do this? */ |
106 | set_need_resched(); | |
107 | break; | |
1da177e4 | 108 | case PPC_MSG_DEBUGGER_BREAK: |
cc532915 | 109 | if (crash_ipi_function_ptr) { |
7d12e780 | 110 | crash_ipi_function_ptr(get_irq_regs()); |
cc532915 ME |
111 | break; |
112 | } | |
113 | #ifdef CONFIG_DEBUGGER | |
7d12e780 | 114 | debugger_ipi(get_irq_regs()); |
1da177e4 | 115 | break; |
cc532915 ME |
116 | #endif /* CONFIG_DEBUGGER */ |
117 | /* FALLTHROUGH */ | |
1da177e4 LT |
118 | default: |
119 | printk("SMP %d: smp_message_recv(): unknown msg %d\n", | |
120 | smp_processor_id(), msg); | |
121 | break; | |
122 | } | |
123 | } | |
124 | ||
125 | void smp_send_reschedule(int cpu) | |
126 | { | |
8cffc6ac BH |
127 | if (likely(smp_ops)) |
128 | smp_ops->message_pass(cpu, PPC_MSG_RESCHEDULE); | |
1da177e4 LT |
129 | } |
130 | ||
131 | #ifdef CONFIG_DEBUGGER | |
132 | void smp_send_debugger_break(int cpu) | |
133 | { | |
8cffc6ac BH |
134 | if (likely(smp_ops)) |
135 | smp_ops->message_pass(cpu, PPC_MSG_DEBUGGER_BREAK); | |
1da177e4 LT |
136 | } |
137 | #endif | |
138 | ||
cc532915 ME |
139 | #ifdef CONFIG_KEXEC |
140 | void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *)) | |
141 | { | |
142 | crash_ipi_function_ptr = crash_ipi_callback; | |
8cffc6ac | 143 | if (crash_ipi_callback && smp_ops) { |
cc532915 ME |
144 | mb(); |
145 | smp_ops->message_pass(MSG_ALL_BUT_SELF, PPC_MSG_DEBUGGER_BREAK); | |
146 | } | |
147 | } | |
148 | #endif | |
149 | ||
1da177e4 LT |
150 | static void stop_this_cpu(void *dummy) |
151 | { | |
152 | local_irq_disable(); | |
153 | while (1) | |
154 | ; | |
155 | } | |
156 | ||
1da177e4 LT |
157 | /* |
158 | * Structure and data for smp_call_function(). This is designed to minimise | |
159 | * static memory requirements. It also looks cleaner. | |
160 | * Stolen from the i386 version. | |
161 | */ | |
162 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(call_lock); | |
163 | ||
164 | static struct call_data_struct { | |
165 | void (*func) (void *info); | |
166 | void *info; | |
167 | atomic_t started; | |
168 | atomic_t finished; | |
169 | int wait; | |
170 | } *call_data; | |
171 | ||
5ad57078 PM |
172 | /* delay of at least 8 seconds */ |
173 | #define SMP_CALL_TIMEOUT 8 | |
1da177e4 LT |
174 | |
175 | /* | |
44755d11 | 176 | * These functions send a 'generic call function' IPI to other online |
177 | * CPUS in the system. | |
1da177e4 | 178 | * |
44755d11 | 179 | * [SUMMARY] Run a function on other CPUs. |
1da177e4 LT |
180 | * <func> The function to run. This must be fast and non-blocking. |
181 | * <info> An arbitrary pointer to pass to the function. | |
182 | * <nonatomic> currently unused. | |
183 | * <wait> If true, wait (atomically) until function has completed on other CPUs. | |
184 | * [RETURNS] 0 on success, else a negative status code. Does not return until | |
185 | * remote CPUs are nearly ready to execute <<func>> or are or have executed. | |
b616de5e | 186 | * <map> is a cpu map of the cpus to send IPI to. |
1da177e4 LT |
187 | * |
188 | * You must not call this function with disabled interrupts or from a | |
189 | * hardware interrupt handler or from a bottom half handler. | |
190 | */ | |
b616de5e OJ |
191 | static int __smp_call_function_map(void (*func) (void *info), void *info, |
192 | int nonatomic, int wait, cpumask_t map) | |
44755d11 | 193 | { |
1da177e4 | 194 | struct call_data_struct data; |
44755d11 | 195 | int ret = -1, num_cpus; |
196 | int cpu; | |
5ad57078 | 197 | u64 timeout; |
1da177e4 | 198 | |
8cffc6ac | 199 | if (unlikely(smp_ops == NULL)) |
44755d11 | 200 | return ret; |
8cffc6ac | 201 | |
1da177e4 LT |
202 | data.func = func; |
203 | data.info = info; | |
204 | atomic_set(&data.started, 0); | |
205 | data.wait = wait; | |
206 | if (wait) | |
207 | atomic_set(&data.finished, 0); | |
208 | ||
d3fdaed9 HD |
209 | /* remove 'self' from the map */ |
210 | if (cpu_isset(smp_processor_id(), map)) | |
211 | cpu_clear(smp_processor_id(), map); | |
212 | ||
213 | /* sanity check the map, remove any non-online processors. */ | |
214 | cpus_and(map, map, cpu_online_map); | |
17aa3a82 KC |
215 | |
216 | num_cpus = cpus_weight(map); | |
217 | if (!num_cpus) | |
d3fdaed9 | 218 | goto done; |
1da177e4 LT |
219 | |
220 | call_data = &data; | |
0d8d4d42 | 221 | smp_wmb(); |
44755d11 | 222 | /* Send a message to all CPUs in the map */ |
223 | for_each_cpu_mask(cpu, map) | |
224 | smp_ops->message_pass(cpu, PPC_MSG_CALL_FUNCTION); | |
1da177e4 | 225 | |
5ad57078 PM |
226 | timeout = get_tb() + (u64) SMP_CALL_TIMEOUT * tb_ticks_per_sec; |
227 | ||
44755d11 | 228 | /* Wait for indication that they have received the message */ |
229 | while (atomic_read(&data.started) != num_cpus) { | |
1da177e4 | 230 | HMT_low(); |
5ad57078 | 231 | if (get_tb() >= timeout) { |
1da177e4 | 232 | printk("smp_call_function on cpu %d: other cpus not " |
44755d11 | 233 | "responding (%d)\n", smp_processor_id(), |
234 | atomic_read(&data.started)); | |
e057d985 OJ |
235 | if (!ipi_fail_ok) |
236 | debugger(NULL); | |
1da177e4 LT |
237 | goto out; |
238 | } | |
239 | } | |
240 | ||
44755d11 | 241 | /* optionally wait for the CPUs to complete */ |
1da177e4 | 242 | if (wait) { |
44755d11 | 243 | while (atomic_read(&data.finished) != num_cpus) { |
1da177e4 | 244 | HMT_low(); |
5ad57078 | 245 | if (get_tb() >= timeout) { |
1da177e4 | 246 | printk("smp_call_function on cpu %d: other " |
44755d11 | 247 | "cpus not finishing (%d/%d)\n", |
248 | smp_processor_id(), | |
249 | atomic_read(&data.finished), | |
250 | atomic_read(&data.started)); | |
1da177e4 LT |
251 | debugger(NULL); |
252 | goto out; | |
253 | } | |
254 | } | |
255 | } | |
256 | ||
d3fdaed9 | 257 | done: |
1da177e4 LT |
258 | ret = 0; |
259 | ||
5ad57078 | 260 | out: |
1da177e4 LT |
261 | call_data = NULL; |
262 | HMT_medium(); | |
1da177e4 LT |
263 | return ret; |
264 | } | |
265 | ||
8fd7675c SS |
266 | static int __smp_call_function(void (*func)(void *info), void *info, |
267 | int nonatomic, int wait) | |
268 | { | |
e057d985 OJ |
269 | int ret; |
270 | spin_lock(&call_lock); | |
271 | ret =__smp_call_function_map(func, info, nonatomic, wait, | |
b616de5e | 272 | cpu_online_map); |
e057d985 OJ |
273 | spin_unlock(&call_lock); |
274 | return ret; | |
8fd7675c SS |
275 | } |
276 | ||
44755d11 | 277 | int smp_call_function(void (*func) (void *info), void *info, int nonatomic, |
278 | int wait) | |
279 | { | |
8fd7675c SS |
280 | /* Can deadlock when called with interrupts disabled */ |
281 | WARN_ON(irqs_disabled()); | |
282 | ||
283 | return __smp_call_function(func, info, nonatomic, wait); | |
44755d11 | 284 | } |
1da177e4 LT |
285 | EXPORT_SYMBOL(smp_call_function); |
286 | ||
b616de5e OJ |
287 | int smp_call_function_single(int cpu, void (*func) (void *info), void *info, |
288 | int nonatomic, int wait) | |
44755d11 | 289 | { |
d3fdaed9 | 290 | cpumask_t map = CPU_MASK_NONE; |
adff093d | 291 | int ret = 0; |
44755d11 | 292 | |
8fd7675c SS |
293 | /* Can deadlock when called with interrupts disabled */ |
294 | WARN_ON(irqs_disabled()); | |
295 | ||
44755d11 | 296 | if (!cpu_online(cpu)) |
297 | return -EINVAL; | |
298 | ||
44755d11 | 299 | cpu_set(cpu, map); |
e057d985 OJ |
300 | if (cpu != get_cpu()) { |
301 | spin_lock(&call_lock); | |
b616de5e | 302 | ret = __smp_call_function_map(func, info, nonatomic, wait, map); |
e057d985 OJ |
303 | spin_unlock(&call_lock); |
304 | } else { | |
adff093d AK |
305 | local_irq_disable(); |
306 | func(info); | |
307 | local_irq_enable(); | |
308 | } | |
d3fdaed9 HD |
309 | put_cpu(); |
310 | return ret; | |
44755d11 | 311 | } |
312 | EXPORT_SYMBOL(smp_call_function_single); | |
313 | ||
8fd7675c SS |
314 | void smp_send_stop(void) |
315 | { | |
e057d985 OJ |
316 | int nolock; |
317 | ||
318 | /* It's OK to fail sending the IPI, since the alternative is to | |
319 | * be stuck forever waiting on the other CPU to take the interrupt. | |
320 | * | |
321 | * It's better to at least continue and go through reboot, since this | |
322 | * function is usually called at panic or reboot time in the first | |
323 | * place. | |
324 | */ | |
325 | ipi_fail_ok = 1; | |
326 | ||
327 | /* Don't deadlock in case we got called through panic */ | |
328 | nolock = !spin_trylock(&call_lock); | |
329 | __smp_call_function_map(stop_this_cpu, NULL, 1, 0, cpu_online_map); | |
330 | if (!nolock) | |
331 | spin_unlock(&call_lock); | |
8fd7675c SS |
332 | } |
333 | ||
1da177e4 LT |
334 | void smp_call_function_interrupt(void) |
335 | { | |
336 | void (*func) (void *info); | |
337 | void *info; | |
338 | int wait; | |
339 | ||
340 | /* call_data will be NULL if the sender timed out while | |
341 | * waiting on us to receive the call. | |
342 | */ | |
343 | if (!call_data) | |
344 | return; | |
345 | ||
346 | func = call_data->func; | |
347 | info = call_data->info; | |
348 | wait = call_data->wait; | |
349 | ||
350 | if (!wait) | |
351 | smp_mb__before_atomic_inc(); | |
352 | ||
353 | /* | |
354 | * Notify initiating CPU that I've grabbed the data and am | |
355 | * about to execute the function | |
356 | */ | |
357 | atomic_inc(&call_data->started); | |
358 | /* | |
359 | * At this point the info structure may be out of scope unless wait==1 | |
360 | */ | |
361 | (*func)(info); | |
362 | if (wait) { | |
363 | smp_mb__before_atomic_inc(); | |
364 | atomic_inc(&call_data->finished); | |
365 | } | |
366 | } | |
367 | ||
1da177e4 LT |
368 | extern struct gettimeofday_struct do_gtod; |
369 | ||
370 | struct thread_info *current_set[NR_CPUS]; | |
371 | ||
372 | DECLARE_PER_CPU(unsigned int, pvr); | |
373 | ||
374 | static void __devinit smp_store_cpu_info(int id) | |
375 | { | |
376 | per_cpu(pvr, id) = mfspr(SPRN_PVR); | |
377 | } | |
378 | ||
379 | static void __init smp_create_idle(unsigned int cpu) | |
380 | { | |
381 | struct task_struct *p; | |
382 | ||
383 | /* create a process for the processor */ | |
384 | p = fork_idle(cpu); | |
385 | if (IS_ERR(p)) | |
386 | panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p)); | |
5ad57078 | 387 | #ifdef CONFIG_PPC64 |
1da177e4 | 388 | paca[cpu].__current = p; |
5ad57078 | 389 | #endif |
b5e2fc1c AV |
390 | current_set[cpu] = task_thread_info(p); |
391 | task_thread_info(p)->cpu = cpu; | |
1da177e4 LT |
392 | } |
393 | ||
394 | void __init smp_prepare_cpus(unsigned int max_cpus) | |
395 | { | |
396 | unsigned int cpu; | |
397 | ||
398 | DBG("smp_prepare_cpus\n"); | |
399 | ||
400 | /* | |
401 | * setup_cpu may need to be called on the boot cpu. We havent | |
402 | * spun any cpus up but lets be paranoid. | |
403 | */ | |
404 | BUG_ON(boot_cpuid != smp_processor_id()); | |
405 | ||
406 | /* Fixup boot cpu */ | |
407 | smp_store_cpu_info(boot_cpuid); | |
408 | cpu_callin_map[boot_cpuid] = 1; | |
409 | ||
8cffc6ac BH |
410 | if (smp_ops) |
411 | max_cpus = smp_ops->probe(); | |
412 | else | |
413 | max_cpus = 1; | |
1da177e4 LT |
414 | |
415 | smp_space_timers(max_cpus); | |
416 | ||
0e551954 | 417 | for_each_possible_cpu(cpu) |
1da177e4 LT |
418 | if (cpu != boot_cpuid) |
419 | smp_create_idle(cpu); | |
420 | } | |
421 | ||
422 | void __devinit smp_prepare_boot_cpu(void) | |
423 | { | |
424 | BUG_ON(smp_processor_id() != boot_cpuid); | |
425 | ||
426 | cpu_set(boot_cpuid, cpu_online_map); | |
5ad57078 | 427 | #ifdef CONFIG_PPC64 |
1da177e4 | 428 | paca[boot_cpuid].__current = current; |
5ad57078 | 429 | #endif |
b5e2fc1c | 430 | current_set[boot_cpuid] = task_thread_info(current); |
1da177e4 LT |
431 | } |
432 | ||
433 | #ifdef CONFIG_HOTPLUG_CPU | |
434 | /* State of each CPU during hotplug phases */ | |
435 | DEFINE_PER_CPU(int, cpu_state) = { 0 }; | |
436 | ||
437 | int generic_cpu_disable(void) | |
438 | { | |
439 | unsigned int cpu = smp_processor_id(); | |
440 | ||
441 | if (cpu == boot_cpuid) | |
442 | return -EBUSY; | |
443 | ||
1da177e4 | 444 | cpu_clear(cpu, cpu_online_map); |
799d6046 | 445 | #ifdef CONFIG_PPC64 |
a7f290da | 446 | vdso_data->processorCount--; |
1da177e4 | 447 | fixup_irqs(cpu_online_map); |
094fe2e7 | 448 | #endif |
1da177e4 LT |
449 | return 0; |
450 | } | |
451 | ||
452 | int generic_cpu_enable(unsigned int cpu) | |
453 | { | |
454 | /* Do the normal bootup if we haven't | |
455 | * already bootstrapped. */ | |
456 | if (system_state != SYSTEM_RUNNING) | |
457 | return -ENOSYS; | |
458 | ||
459 | /* get the target out of it's holding state */ | |
460 | per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; | |
0d8d4d42 | 461 | smp_wmb(); |
1da177e4 LT |
462 | |
463 | while (!cpu_online(cpu)) | |
464 | cpu_relax(); | |
465 | ||
094fe2e7 | 466 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
467 | fixup_irqs(cpu_online_map); |
468 | /* counter the irq disable in fixup_irqs */ | |
469 | local_irq_enable(); | |
094fe2e7 | 470 | #endif |
1da177e4 LT |
471 | return 0; |
472 | } | |
473 | ||
474 | void generic_cpu_die(unsigned int cpu) | |
475 | { | |
476 | int i; | |
477 | ||
478 | for (i = 0; i < 100; i++) { | |
0d8d4d42 | 479 | smp_rmb(); |
1da177e4 LT |
480 | if (per_cpu(cpu_state, cpu) == CPU_DEAD) |
481 | return; | |
482 | msleep(100); | |
483 | } | |
484 | printk(KERN_ERR "CPU%d didn't die...\n", cpu); | |
485 | } | |
486 | ||
487 | void generic_mach_cpu_die(void) | |
488 | { | |
489 | unsigned int cpu; | |
490 | ||
491 | local_irq_disable(); | |
492 | cpu = smp_processor_id(); | |
493 | printk(KERN_DEBUG "CPU%d offline\n", cpu); | |
494 | __get_cpu_var(cpu_state) = CPU_DEAD; | |
0d8d4d42 | 495 | smp_wmb(); |
1da177e4 LT |
496 | while (__get_cpu_var(cpu_state) != CPU_UP_PREPARE) |
497 | cpu_relax(); | |
1da177e4 LT |
498 | cpu_set(cpu, cpu_online_map); |
499 | local_irq_enable(); | |
500 | } | |
501 | #endif | |
502 | ||
503 | static int __devinit cpu_enable(unsigned int cpu) | |
504 | { | |
8cffc6ac | 505 | if (smp_ops && smp_ops->cpu_enable) |
1da177e4 LT |
506 | return smp_ops->cpu_enable(cpu); |
507 | ||
508 | return -ENOSYS; | |
509 | } | |
510 | ||
b282b6f8 | 511 | int __cpuinit __cpu_up(unsigned int cpu) |
1da177e4 LT |
512 | { |
513 | int c; | |
514 | ||
5ad57078 | 515 | secondary_ti = current_set[cpu]; |
1da177e4 LT |
516 | if (!cpu_enable(cpu)) |
517 | return 0; | |
518 | ||
8cffc6ac BH |
519 | if (smp_ops == NULL || |
520 | (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu))) | |
1da177e4 LT |
521 | return -EINVAL; |
522 | ||
1da177e4 LT |
523 | /* Make sure callin-map entry is 0 (can be leftover a CPU |
524 | * hotplug | |
525 | */ | |
526 | cpu_callin_map[cpu] = 0; | |
527 | ||
528 | /* The information for processor bringup must | |
529 | * be written out to main store before we release | |
530 | * the processor. | |
531 | */ | |
0d8d4d42 | 532 | smp_mb(); |
1da177e4 LT |
533 | |
534 | /* wake up cpus */ | |
535 | DBG("smp: kicking cpu %d\n", cpu); | |
536 | smp_ops->kick_cpu(cpu); | |
537 | ||
538 | /* | |
539 | * wait to see if the cpu made a callin (is actually up). | |
540 | * use this value that I found through experimentation. | |
541 | * -- Cort | |
542 | */ | |
543 | if (system_state < SYSTEM_RUNNING) | |
ee0339f2 | 544 | for (c = 50000; c && !cpu_callin_map[cpu]; c--) |
1da177e4 LT |
545 | udelay(100); |
546 | #ifdef CONFIG_HOTPLUG_CPU | |
547 | else | |
548 | /* | |
549 | * CPUs can take much longer to come up in the | |
550 | * hotplug case. Wait five seconds. | |
551 | */ | |
552 | for (c = 25; c && !cpu_callin_map[cpu]; c--) { | |
553 | msleep(200); | |
554 | } | |
555 | #endif | |
556 | ||
557 | if (!cpu_callin_map[cpu]) { | |
558 | printk("Processor %u is stuck.\n", cpu); | |
559 | return -ENOENT; | |
560 | } | |
561 | ||
562 | printk("Processor %u found.\n", cpu); | |
563 | ||
564 | if (smp_ops->give_timebase) | |
565 | smp_ops->give_timebase(); | |
566 | ||
567 | /* Wait until cpu puts itself in the online map */ | |
568 | while (!cpu_online(cpu)) | |
569 | cpu_relax(); | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
574 | ||
575 | /* Activate a secondary processor. */ | |
576 | int __devinit start_secondary(void *unused) | |
577 | { | |
578 | unsigned int cpu = smp_processor_id(); | |
579 | ||
580 | atomic_inc(&init_mm.mm_count); | |
581 | current->active_mm = &init_mm; | |
582 | ||
583 | smp_store_cpu_info(cpu); | |
5ad57078 | 584 | set_dec(tb_ticks_per_jiffy); |
e4d76e1c | 585 | preempt_disable(); |
1da177e4 LT |
586 | cpu_callin_map[cpu] = 1; |
587 | ||
588 | smp_ops->setup_cpu(cpu); | |
589 | if (smp_ops->take_timebase) | |
590 | smp_ops->take_timebase(); | |
591 | ||
7d4d6154 | 592 | if (system_state > SYSTEM_BOOTING) |
c6622f63 | 593 | snapshot_timebase(); |
7d4d6154 | 594 | |
d831d0b8 TB |
595 | secondary_cpu_time_init(); |
596 | ||
1da177e4 LT |
597 | spin_lock(&call_lock); |
598 | cpu_set(cpu, cpu_online_map); | |
599 | spin_unlock(&call_lock); | |
600 | ||
601 | local_irq_enable(); | |
602 | ||
603 | cpu_idle(); | |
604 | return 0; | |
605 | } | |
606 | ||
607 | int setup_profiling_timer(unsigned int multiplier) | |
608 | { | |
609 | return 0; | |
610 | } | |
611 | ||
612 | void __init smp_cpus_done(unsigned int max_cpus) | |
613 | { | |
614 | cpumask_t old_mask; | |
615 | ||
616 | /* We want the setup_cpu() here to be called from CPU 0, but our | |
617 | * init thread may have been "borrowed" by another CPU in the meantime | |
618 | * se we pin us down to CPU 0 for a short while | |
619 | */ | |
620 | old_mask = current->cpus_allowed; | |
621 | set_cpus_allowed(current, cpumask_of_cpu(boot_cpuid)); | |
622 | ||
8cffc6ac BH |
623 | if (smp_ops) |
624 | smp_ops->setup_cpu(boot_cpuid); | |
1da177e4 LT |
625 | |
626 | set_cpus_allowed(current, old_mask); | |
4b703a23 | 627 | |
c6622f63 PM |
628 | snapshot_timebases(); |
629 | ||
4b703a23 | 630 | dump_numa_cpu_topology(); |
1da177e4 LT |
631 | } |
632 | ||
633 | #ifdef CONFIG_HOTPLUG_CPU | |
634 | int __cpu_disable(void) | |
635 | { | |
636 | if (smp_ops->cpu_disable) | |
637 | return smp_ops->cpu_disable(); | |
638 | ||
639 | return -ENOSYS; | |
640 | } | |
641 | ||
642 | void __cpu_die(unsigned int cpu) | |
643 | { | |
644 | if (smp_ops->cpu_die) | |
645 | smp_ops->cpu_die(cpu); | |
646 | } | |
647 | #endif |