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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/smp.c | |
3 | * | |
4 | * Copyright (C) 2002 ARM Limited, All Rights Reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
c97d4869 | 10 | #include <linux/module.h> |
1da177e4 LT |
11 | #include <linux/delay.h> |
12 | #include <linux/init.h> | |
13 | #include <linux/spinlock.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/cache.h> | |
17 | #include <linux/profile.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/mm.h> | |
4e950f6f | 20 | #include <linux/err.h> |
1da177e4 LT |
21 | #include <linux/cpu.h> |
22 | #include <linux/smp.h> | |
23 | #include <linux/seq_file.h> | |
c97d4869 | 24 | #include <linux/irq.h> |
bc28248e RK |
25 | #include <linux/percpu.h> |
26 | #include <linux/clockchips.h> | |
3c030bea | 27 | #include <linux/completion.h> |
1da177e4 | 28 | |
60063497 | 29 | #include <linux/atomic.h> |
1da177e4 LT |
30 | #include <asm/cacheflush.h> |
31 | #include <asm/cpu.h> | |
42578c82 | 32 | #include <asm/cputype.h> |
5a567d78 | 33 | #include <asm/exception.h> |
8903826d | 34 | #include <asm/idmap.h> |
c9018aab | 35 | #include <asm/topology.h> |
e65f38ed RK |
36 | #include <asm/mmu_context.h> |
37 | #include <asm/pgtable.h> | |
38 | #include <asm/pgalloc.h> | |
1da177e4 | 39 | #include <asm/processor.h> |
37b05b63 | 40 | #include <asm/sections.h> |
1da177e4 LT |
41 | #include <asm/tlbflush.h> |
42 | #include <asm/ptrace.h> | |
bc28248e | 43 | #include <asm/localtimer.h> |
d6257288 | 44 | #include <asm/smp_plat.h> |
1da177e4 | 45 | |
e65f38ed RK |
46 | /* |
47 | * as from 2.5, kernels no longer have an init_tasks structure | |
48 | * so we need some other way of telling a new secondary core | |
49 | * where to place its SVC stack | |
50 | */ | |
51 | struct secondary_data secondary_data; | |
52 | ||
1da177e4 | 53 | enum ipi_msg_type { |
24480d98 | 54 | IPI_TIMER = 2, |
1da177e4 LT |
55 | IPI_RESCHEDULE, |
56 | IPI_CALL_FUNC, | |
f6dd9fa5 | 57 | IPI_CALL_FUNC_SINGLE, |
1da177e4 LT |
58 | IPI_CPU_STOP, |
59 | }; | |
60 | ||
149c2415 RK |
61 | static DECLARE_COMPLETION(cpu_running); |
62 | ||
84ec6d57 | 63 | int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *idle) |
1da177e4 | 64 | { |
1da177e4 LT |
65 | int ret; |
66 | ||
e65f38ed RK |
67 | /* |
68 | * We need to tell the secondary core where to find | |
69 | * its stack and the page tables. | |
70 | */ | |
32d39a93 | 71 | secondary_data.stack = task_stack_page(idle) + THREAD_START_SP; |
4e8ee7de | 72 | secondary_data.pgdir = virt_to_phys(idmap_pgd); |
d427958a | 73 | secondary_data.swapper_pg_dir = virt_to_phys(swapper_pg_dir); |
1027247f RK |
74 | __cpuc_flush_dcache_area(&secondary_data, sizeof(secondary_data)); |
75 | outer_clean_range(__pa(&secondary_data), __pa(&secondary_data + 1)); | |
e65f38ed | 76 | |
1da177e4 LT |
77 | /* |
78 | * Now bring the CPU into our world. | |
79 | */ | |
80 | ret = boot_secondary(cpu, idle); | |
e65f38ed | 81 | if (ret == 0) { |
e65f38ed RK |
82 | /* |
83 | * CPU was successfully started, wait for it | |
84 | * to come online or time out. | |
85 | */ | |
149c2415 RK |
86 | wait_for_completion_timeout(&cpu_running, |
87 | msecs_to_jiffies(1000)); | |
e65f38ed | 88 | |
58613cd1 RK |
89 | if (!cpu_online(cpu)) { |
90 | pr_crit("CPU%u: failed to come online\n", cpu); | |
e65f38ed | 91 | ret = -EIO; |
58613cd1 RK |
92 | } |
93 | } else { | |
94 | pr_err("CPU%u: failed to boot: %d\n", cpu, ret); | |
e65f38ed RK |
95 | } |
96 | ||
5d43045b | 97 | secondary_data.stack = NULL; |
e65f38ed RK |
98 | secondary_data.pgdir = 0; |
99 | ||
1da177e4 LT |
100 | return ret; |
101 | } | |
102 | ||
a054a811 | 103 | #ifdef CONFIG_HOTPLUG_CPU |
10034aab RK |
104 | static void percpu_timer_stop(void); |
105 | ||
a054a811 RK |
106 | /* |
107 | * __cpu_disable runs on the processor to be shutdown. | |
108 | */ | |
90140c30 | 109 | int __cpu_disable(void) |
a054a811 RK |
110 | { |
111 | unsigned int cpu = smp_processor_id(); | |
a054a811 RK |
112 | int ret; |
113 | ||
8e2a43f5 | 114 | ret = platform_cpu_disable(cpu); |
a054a811 RK |
115 | if (ret) |
116 | return ret; | |
117 | ||
118 | /* | |
119 | * Take this CPU offline. Once we clear this, we can't return, | |
120 | * and we must not schedule until we're ready to give up the cpu. | |
121 | */ | |
e03cdade | 122 | set_cpu_online(cpu, false); |
a054a811 RK |
123 | |
124 | /* | |
125 | * OK - migrate IRQs away from this CPU | |
126 | */ | |
127 | migrate_irqs(); | |
128 | ||
37ee16ae RK |
129 | /* |
130 | * Stop the local timer for this CPU. | |
131 | */ | |
10034aab | 132 | percpu_timer_stop(); |
37ee16ae | 133 | |
a054a811 RK |
134 | /* |
135 | * Flush user cache and TLB mappings, and then remove this CPU | |
136 | * from the vm mask set of all processes. | |
137 | */ | |
138 | flush_cache_all(); | |
139 | local_flush_tlb_all(); | |
140 | ||
3eaa73bd | 141 | clear_tasks_mm_cpumask(cpu); |
a054a811 RK |
142 | |
143 | return 0; | |
144 | } | |
145 | ||
3c030bea RK |
146 | static DECLARE_COMPLETION(cpu_died); |
147 | ||
a054a811 RK |
148 | /* |
149 | * called on the thread which is asking for a CPU to be shutdown - | |
150 | * waits until shutdown has completed, or it is timed out. | |
151 | */ | |
90140c30 | 152 | void __cpu_die(unsigned int cpu) |
a054a811 | 153 | { |
3c030bea RK |
154 | if (!wait_for_completion_timeout(&cpu_died, msecs_to_jiffies(5000))) { |
155 | pr_err("CPU%u: cpu didn't die\n", cpu); | |
156 | return; | |
157 | } | |
158 | printk(KERN_NOTICE "CPU%u: shutdown\n", cpu); | |
159 | ||
a054a811 RK |
160 | if (!platform_cpu_kill(cpu)) |
161 | printk("CPU%u: unable to kill\n", cpu); | |
162 | } | |
163 | ||
164 | /* | |
165 | * Called from the idle thread for the CPU which has been shutdown. | |
166 | * | |
167 | * Note that we disable IRQs here, but do not re-enable them | |
168 | * before returning to the caller. This is also the behaviour | |
169 | * of the other hotplug-cpu capable cores, so presumably coming | |
170 | * out of idle fixes this. | |
171 | */ | |
90140c30 | 172 | void __ref cpu_die(void) |
a054a811 RK |
173 | { |
174 | unsigned int cpu = smp_processor_id(); | |
175 | ||
a054a811 RK |
176 | idle_task_exit(); |
177 | ||
f36d3401 RK |
178 | local_irq_disable(); |
179 | mb(); | |
180 | ||
3c030bea | 181 | /* Tell __cpu_die() that this CPU is now safe to dispose of */ |
ff081e05 | 182 | RCU_NONIDLE(complete(&cpu_died)); |
3c030bea | 183 | |
a054a811 RK |
184 | /* |
185 | * actual CPU shutdown procedure is at least platform (if not | |
3c030bea | 186 | * CPU) specific. |
a054a811 RK |
187 | */ |
188 | platform_cpu_die(cpu); | |
189 | ||
190 | /* | |
191 | * Do not return to the idle loop - jump back to the secondary | |
192 | * cpu initialisation. There's some initialisation which needs | |
193 | * to be repeated to undo the effects of taking the CPU offline. | |
194 | */ | |
195 | __asm__("mov sp, %0\n" | |
faabfa08 | 196 | " mov fp, #0\n" |
a054a811 RK |
197 | " b secondary_start_kernel" |
198 | : | |
32d39a93 | 199 | : "r" (task_stack_page(current) + THREAD_SIZE - 8)); |
a054a811 RK |
200 | } |
201 | #endif /* CONFIG_HOTPLUG_CPU */ | |
202 | ||
05c74a6c RK |
203 | /* |
204 | * Called by both boot and secondaries to move global data into | |
205 | * per-processor storage. | |
206 | */ | |
207 | static void __cpuinit smp_store_cpu_info(unsigned int cpuid) | |
208 | { | |
209 | struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid); | |
210 | ||
211 | cpu_info->loops_per_jiffy = loops_per_jiffy; | |
c9018aab VG |
212 | |
213 | store_cpu_topology(cpuid); | |
05c74a6c RK |
214 | } |
215 | ||
d4578592 MZ |
216 | static void percpu_timer_setup(void); |
217 | ||
e65f38ed RK |
218 | /* |
219 | * This is the secondary CPU boot entry. We're using this CPUs | |
220 | * idle thread stack, but a set of temporary page tables. | |
221 | */ | |
bd6f68af | 222 | asmlinkage void __cpuinit secondary_start_kernel(void) |
e65f38ed RK |
223 | { |
224 | struct mm_struct *mm = &init_mm; | |
da2660d2 | 225 | unsigned int cpu = smp_processor_id(); |
e65f38ed | 226 | |
e65f38ed RK |
227 | /* |
228 | * All kernel threads share the same mm context; grab a | |
229 | * reference and switch to it. | |
230 | */ | |
e65f38ed RK |
231 | atomic_inc(&mm->mm_count); |
232 | current->active_mm = mm; | |
56f8ba83 | 233 | cpumask_set_cpu(cpu, mm_cpumask(mm)); |
e65f38ed RK |
234 | cpu_switch_mm(mm->pgd, mm); |
235 | enter_lazy_tlb(mm, current); | |
505d7b19 | 236 | local_flush_tlb_all(); |
e65f38ed | 237 | |
fde165b2 CC |
238 | printk("CPU%u: Booted secondary processor\n", cpu); |
239 | ||
e65f38ed | 240 | cpu_init(); |
5bfb5d69 | 241 | preempt_disable(); |
2c0136db | 242 | trace_hardirqs_off(); |
e65f38ed RK |
243 | |
244 | /* | |
245 | * Give the platform a chance to do its own initialisation. | |
246 | */ | |
247 | platform_secondary_init(cpu); | |
248 | ||
e545a614 | 249 | notify_cpu_starting(cpu); |
a8655e83 | 250 | |
e65f38ed RK |
251 | calibrate_delay(); |
252 | ||
253 | smp_store_cpu_info(cpu); | |
254 | ||
255 | /* | |
573619d1 RK |
256 | * OK, now it's safe to let the boot CPU continue. Wait for |
257 | * the CPU migration code to notice that the CPU is online | |
149c2415 | 258 | * before we continue - which happens after __cpu_up returns. |
e65f38ed | 259 | */ |
e03cdade | 260 | set_cpu_online(cpu, true); |
149c2415 | 261 | complete(&cpu_running); |
eb047454 TG |
262 | |
263 | /* | |
264 | * Setup the percpu timer for this CPU. | |
265 | */ | |
266 | percpu_timer_setup(); | |
267 | ||
eb047454 TG |
268 | local_irq_enable(); |
269 | local_fiq_enable(); | |
270 | ||
e65f38ed RK |
271 | /* |
272 | * OK, it's off to the idle thread for us | |
273 | */ | |
274 | cpu_idle(); | |
275 | } | |
276 | ||
1da177e4 LT |
277 | void __init smp_cpus_done(unsigned int max_cpus) |
278 | { | |
279 | int cpu; | |
280 | unsigned long bogosum = 0; | |
281 | ||
282 | for_each_online_cpu(cpu) | |
283 | bogosum += per_cpu(cpu_data, cpu).loops_per_jiffy; | |
284 | ||
285 | printk(KERN_INFO "SMP: Total of %d processors activated " | |
286 | "(%lu.%02lu BogoMIPS).\n", | |
287 | num_online_cpus(), | |
288 | bogosum / (500000/HZ), | |
289 | (bogosum / (5000/HZ)) % 100); | |
290 | } | |
291 | ||
292 | void __init smp_prepare_boot_cpu(void) | |
293 | { | |
1da177e4 LT |
294 | } |
295 | ||
05c74a6c | 296 | void __init smp_prepare_cpus(unsigned int max_cpus) |
1da177e4 | 297 | { |
05c74a6c | 298 | unsigned int ncores = num_possible_cpus(); |
1da177e4 | 299 | |
c9018aab VG |
300 | init_cpu_topology(); |
301 | ||
05c74a6c | 302 | smp_store_cpu_info(smp_processor_id()); |
1da177e4 LT |
303 | |
304 | /* | |
05c74a6c | 305 | * are we trying to boot more cores than exist? |
1da177e4 | 306 | */ |
05c74a6c RK |
307 | if (max_cpus > ncores) |
308 | max_cpus = ncores; | |
7fa22bd5 | 309 | if (ncores > 1 && max_cpus) { |
05c74a6c RK |
310 | /* |
311 | * Enable the local timer or broadcast device for the | |
312 | * boot CPU, but only if we have more than one CPU. | |
313 | */ | |
314 | percpu_timer_setup(); | |
1da177e4 | 315 | |
7fa22bd5 SB |
316 | /* |
317 | * Initialise the present map, which describes the set of CPUs | |
318 | * actually populated at the present time. A platform should | |
319 | * re-initialize the map in platform_smp_prepare_cpus() if | |
320 | * present != possible (e.g. physical hotplug). | |
321 | */ | |
0b5f9c00 | 322 | init_cpu_present(cpu_possible_mask); |
7fa22bd5 | 323 | |
05c74a6c RK |
324 | /* |
325 | * Initialise the SCU if there are more than one CPU | |
326 | * and let them know where to start. | |
327 | */ | |
328 | platform_smp_prepare_cpus(max_cpus); | |
329 | } | |
1da177e4 LT |
330 | } |
331 | ||
0f7b332f RK |
332 | static void (*smp_cross_call)(const struct cpumask *, unsigned int); |
333 | ||
334 | void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int)) | |
335 | { | |
336 | smp_cross_call = fn; | |
337 | } | |
338 | ||
82668104 | 339 | void arch_send_call_function_ipi_mask(const struct cpumask *mask) |
1da177e4 | 340 | { |
e3fbb087 | 341 | smp_cross_call(mask, IPI_CALL_FUNC); |
1da177e4 LT |
342 | } |
343 | ||
f6dd9fa5 | 344 | void arch_send_call_function_single_ipi(int cpu) |
3e459990 | 345 | { |
e3fbb087 | 346 | smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE); |
3e459990 | 347 | } |
3e459990 | 348 | |
4a88abd7 RK |
349 | static const char *ipi_types[NR_IPI] = { |
350 | #define S(x,s) [x - IPI_TIMER] = s | |
351 | S(IPI_TIMER, "Timer broadcast interrupts"), | |
352 | S(IPI_RESCHEDULE, "Rescheduling interrupts"), | |
353 | S(IPI_CALL_FUNC, "Function call interrupts"), | |
354 | S(IPI_CALL_FUNC_SINGLE, "Single function call interrupts"), | |
355 | S(IPI_CPU_STOP, "CPU stop interrupts"), | |
356 | }; | |
357 | ||
f13cd417 | 358 | void show_ipi_list(struct seq_file *p, int prec) |
1da177e4 | 359 | { |
4a88abd7 | 360 | unsigned int cpu, i; |
1da177e4 | 361 | |
4a88abd7 RK |
362 | for (i = 0; i < NR_IPI; i++) { |
363 | seq_printf(p, "%*s%u: ", prec - 1, "IPI", i); | |
1da177e4 | 364 | |
4a88abd7 RK |
365 | for_each_present_cpu(cpu) |
366 | seq_printf(p, "%10u ", | |
367 | __get_irq_stat(cpu, ipi_irqs[i])); | |
1da177e4 | 368 | |
4a88abd7 RK |
369 | seq_printf(p, " %s\n", ipi_types[i]); |
370 | } | |
1da177e4 LT |
371 | } |
372 | ||
b54992fe | 373 | u64 smp_irq_stat_cpu(unsigned int cpu) |
37ee16ae | 374 | { |
b54992fe RK |
375 | u64 sum = 0; |
376 | int i; | |
37ee16ae | 377 | |
b54992fe RK |
378 | for (i = 0; i < NR_IPI; i++) |
379 | sum += __get_irq_stat(cpu, ipi_irqs[i]); | |
37ee16ae | 380 | |
b54992fe | 381 | return sum; |
37ee16ae RK |
382 | } |
383 | ||
bc28248e RK |
384 | /* |
385 | * Timer (local or broadcast) support | |
386 | */ | |
387 | static DEFINE_PER_CPU(struct clock_event_device, percpu_clockevent); | |
388 | ||
c97d4869 | 389 | static void ipi_timer(void) |
1da177e4 | 390 | { |
bc28248e | 391 | struct clock_event_device *evt = &__get_cpu_var(percpu_clockevent); |
bc28248e | 392 | evt->event_handler(evt); |
1da177e4 LT |
393 | } |
394 | ||
bc28248e RK |
395 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
396 | static void smp_timer_broadcast(const struct cpumask *mask) | |
397 | { | |
e3fbb087 | 398 | smp_cross_call(mask, IPI_TIMER); |
bc28248e | 399 | } |
5388a6b2 RK |
400 | #else |
401 | #define smp_timer_broadcast NULL | |
402 | #endif | |
bc28248e RK |
403 | |
404 | static void broadcast_timer_set_mode(enum clock_event_mode mode, | |
405 | struct clock_event_device *evt) | |
406 | { | |
407 | } | |
408 | ||
a8d2518c | 409 | static void __cpuinit broadcast_timer_setup(struct clock_event_device *evt) |
bc28248e RK |
410 | { |
411 | evt->name = "dummy_timer"; | |
412 | evt->features = CLOCK_EVT_FEAT_ONESHOT | | |
413 | CLOCK_EVT_FEAT_PERIODIC | | |
414 | CLOCK_EVT_FEAT_DUMMY; | |
415 | evt->rating = 400; | |
416 | evt->mult = 1; | |
417 | evt->set_mode = broadcast_timer_set_mode; | |
bc28248e RK |
418 | |
419 | clockevents_register_device(evt); | |
420 | } | |
bc28248e | 421 | |
0ef330e1 MZ |
422 | static struct local_timer_ops *lt_ops; |
423 | ||
424 | #ifdef CONFIG_LOCAL_TIMERS | |
425 | int local_timer_register(struct local_timer_ops *ops) | |
426 | { | |
bfa05f4f MZ |
427 | if (!is_smp() || !setup_max_cpus) |
428 | return -ENXIO; | |
429 | ||
0ef330e1 MZ |
430 | if (lt_ops) |
431 | return -EBUSY; | |
432 | ||
433 | lt_ops = ops; | |
434 | return 0; | |
435 | } | |
436 | #endif | |
437 | ||
d4578592 | 438 | static void __cpuinit percpu_timer_setup(void) |
bc28248e RK |
439 | { |
440 | unsigned int cpu = smp_processor_id(); | |
441 | struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu); | |
442 | ||
443 | evt->cpumask = cpumask_of(cpu); | |
5388a6b2 | 444 | evt->broadcast = smp_timer_broadcast; |
bc28248e | 445 | |
d4578592 | 446 | if (!lt_ops || lt_ops->setup(evt)) |
af90f10d | 447 | broadcast_timer_setup(evt); |
bc28248e RK |
448 | } |
449 | ||
10034aab RK |
450 | #ifdef CONFIG_HOTPLUG_CPU |
451 | /* | |
452 | * The generic clock events code purposely does not stop the local timer | |
453 | * on CPU_DEAD/CPU_DEAD_FROZEN hotplug events, so we have to do it | |
454 | * manually here. | |
455 | */ | |
456 | static void percpu_timer_stop(void) | |
457 | { | |
458 | unsigned int cpu = smp_processor_id(); | |
459 | struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu); | |
460 | ||
d4578592 MZ |
461 | if (lt_ops) |
462 | lt_ops->stop(evt); | |
10034aab RK |
463 | } |
464 | #endif | |
465 | ||
bd31b859 | 466 | static DEFINE_RAW_SPINLOCK(stop_lock); |
1da177e4 LT |
467 | |
468 | /* | |
469 | * ipi_cpu_stop - handle IPI from smp_send_stop() | |
470 | */ | |
471 | static void ipi_cpu_stop(unsigned int cpu) | |
472 | { | |
3d3f78d7 RK |
473 | if (system_state == SYSTEM_BOOTING || |
474 | system_state == SYSTEM_RUNNING) { | |
bd31b859 | 475 | raw_spin_lock(&stop_lock); |
3d3f78d7 RK |
476 | printk(KERN_CRIT "CPU%u: stopping\n", cpu); |
477 | dump_stack(); | |
bd31b859 | 478 | raw_spin_unlock(&stop_lock); |
3d3f78d7 | 479 | } |
1da177e4 | 480 | |
e03cdade | 481 | set_cpu_online(cpu, false); |
1da177e4 LT |
482 | |
483 | local_fiq_disable(); | |
484 | local_irq_disable(); | |
485 | ||
486 | while (1) | |
487 | cpu_relax(); | |
488 | } | |
489 | ||
490 | /* | |
491 | * Main handler for inter-processor interrupts | |
1da177e4 | 492 | */ |
4073723a | 493 | asmlinkage void __exception_irq_entry do_IPI(int ipinr, struct pt_regs *regs) |
0b5a1b95 SG |
494 | { |
495 | handle_IPI(ipinr, regs); | |
496 | } | |
497 | ||
498 | void handle_IPI(int ipinr, struct pt_regs *regs) | |
1da177e4 LT |
499 | { |
500 | unsigned int cpu = smp_processor_id(); | |
c97d4869 | 501 | struct pt_regs *old_regs = set_irq_regs(regs); |
1da177e4 | 502 | |
4a88abd7 RK |
503 | if (ipinr >= IPI_TIMER && ipinr < IPI_TIMER + NR_IPI) |
504 | __inc_irq_stat(cpu, ipi_irqs[ipinr - IPI_TIMER]); | |
1da177e4 | 505 | |
24480d98 RK |
506 | switch (ipinr) { |
507 | case IPI_TIMER: | |
7deabca0 | 508 | irq_enter(); |
24480d98 | 509 | ipi_timer(); |
7deabca0 | 510 | irq_exit(); |
24480d98 | 511 | break; |
1da177e4 | 512 | |
24480d98 | 513 | case IPI_RESCHEDULE: |
184748cc | 514 | scheduler_ipi(); |
24480d98 | 515 | break; |
1da177e4 | 516 | |
24480d98 | 517 | case IPI_CALL_FUNC: |
7deabca0 | 518 | irq_enter(); |
24480d98 | 519 | generic_smp_call_function_interrupt(); |
7deabca0 | 520 | irq_exit(); |
24480d98 | 521 | break; |
f6dd9fa5 | 522 | |
24480d98 | 523 | case IPI_CALL_FUNC_SINGLE: |
7deabca0 | 524 | irq_enter(); |
24480d98 | 525 | generic_smp_call_function_single_interrupt(); |
7deabca0 | 526 | irq_exit(); |
24480d98 | 527 | break; |
1da177e4 | 528 | |
24480d98 | 529 | case IPI_CPU_STOP: |
7deabca0 | 530 | irq_enter(); |
24480d98 | 531 | ipi_cpu_stop(cpu); |
7deabca0 | 532 | irq_exit(); |
24480d98 | 533 | break; |
1da177e4 | 534 | |
24480d98 RK |
535 | default: |
536 | printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%x\n", | |
537 | cpu, ipinr); | |
538 | break; | |
1da177e4 | 539 | } |
c97d4869 | 540 | set_irq_regs(old_regs); |
1da177e4 LT |
541 | } |
542 | ||
543 | void smp_send_reschedule(int cpu) | |
544 | { | |
e3fbb087 | 545 | smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE); |
1da177e4 LT |
546 | } |
547 | ||
6fa99b7f WD |
548 | #ifdef CONFIG_HOTPLUG_CPU |
549 | static void smp_kill_cpus(cpumask_t *mask) | |
550 | { | |
551 | unsigned int cpu; | |
552 | for_each_cpu(cpu, mask) | |
553 | platform_cpu_kill(cpu); | |
554 | } | |
555 | #else | |
556 | static void smp_kill_cpus(cpumask_t *mask) { } | |
557 | #endif | |
558 | ||
1da177e4 LT |
559 | void smp_send_stop(void) |
560 | { | |
28e18293 | 561 | unsigned long timeout; |
6fa99b7f | 562 | struct cpumask mask; |
1da177e4 | 563 | |
6fa99b7f WD |
564 | cpumask_copy(&mask, cpu_online_mask); |
565 | cpumask_clear_cpu(smp_processor_id(), &mask); | |
c5dff4ff JMC |
566 | if (!cpumask_empty(&mask)) |
567 | smp_cross_call(&mask, IPI_CPU_STOP); | |
4b0ef3b1 | 568 | |
28e18293 RK |
569 | /* Wait up to one second for other CPUs to stop */ |
570 | timeout = USEC_PER_SEC; | |
571 | while (num_online_cpus() > 1 && timeout--) | |
572 | udelay(1); | |
4b0ef3b1 | 573 | |
28e18293 RK |
574 | if (num_online_cpus() > 1) |
575 | pr_warning("SMP: failed to stop secondary CPUs\n"); | |
6fa99b7f WD |
576 | |
577 | smp_kill_cpus(&mask); | |
4b0ef3b1 RK |
578 | } |
579 | ||
4b0ef3b1 | 580 | /* |
1da177e4 | 581 | * not supported here |
4b0ef3b1 | 582 | */ |
5048bcba | 583 | int setup_profiling_timer(unsigned int multiplier) |
4b0ef3b1 | 584 | { |
1da177e4 | 585 | return -EINVAL; |
4b0ef3b1 | 586 | } |