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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 | ||
bd6f68af | 63 | int __cpuinit __cpu_up(unsigned int cpu) |
1da177e4 | 64 | { |
71f512e8 RK |
65 | struct cpuinfo_arm *ci = &per_cpu(cpu_data, cpu); |
66 | struct task_struct *idle = ci->idle; | |
1da177e4 LT |
67 | int ret; |
68 | ||
69 | /* | |
71f512e8 RK |
70 | * Spawn a new process manually, if not already done. |
71 | * Grab a pointer to its task struct so we can mess with it | |
1da177e4 | 72 | */ |
71f512e8 RK |
73 | if (!idle) { |
74 | idle = fork_idle(cpu); | |
75 | if (IS_ERR(idle)) { | |
76 | printk(KERN_ERR "CPU%u: fork() failed\n", cpu); | |
77 | return PTR_ERR(idle); | |
78 | } | |
79 | ci->idle = idle; | |
13ea9cc8 SS |
80 | } else { |
81 | /* | |
82 | * Since this idle thread is being re-used, call | |
83 | * init_idle() to reinitialize the thread structure. | |
84 | */ | |
85 | init_idle(idle, cpu); | |
1da177e4 LT |
86 | } |
87 | ||
e65f38ed RK |
88 | /* |
89 | * We need to tell the secondary core where to find | |
90 | * its stack and the page tables. | |
91 | */ | |
32d39a93 | 92 | secondary_data.stack = task_stack_page(idle) + THREAD_START_SP; |
4e8ee7de | 93 | secondary_data.pgdir = virt_to_phys(idmap_pgd); |
d427958a | 94 | secondary_data.swapper_pg_dir = virt_to_phys(swapper_pg_dir); |
1027247f RK |
95 | __cpuc_flush_dcache_area(&secondary_data, sizeof(secondary_data)); |
96 | outer_clean_range(__pa(&secondary_data), __pa(&secondary_data + 1)); | |
e65f38ed | 97 | |
1da177e4 LT |
98 | /* |
99 | * Now bring the CPU into our world. | |
100 | */ | |
101 | ret = boot_secondary(cpu, idle); | |
e65f38ed | 102 | if (ret == 0) { |
e65f38ed RK |
103 | /* |
104 | * CPU was successfully started, wait for it | |
105 | * to come online or time out. | |
106 | */ | |
149c2415 RK |
107 | wait_for_completion_timeout(&cpu_running, |
108 | msecs_to_jiffies(1000)); | |
e65f38ed | 109 | |
58613cd1 RK |
110 | if (!cpu_online(cpu)) { |
111 | pr_crit("CPU%u: failed to come online\n", cpu); | |
e65f38ed | 112 | ret = -EIO; |
58613cd1 RK |
113 | } |
114 | } else { | |
115 | pr_err("CPU%u: failed to boot: %d\n", cpu, ret); | |
e65f38ed RK |
116 | } |
117 | ||
5d43045b | 118 | secondary_data.stack = NULL; |
e65f38ed RK |
119 | secondary_data.pgdir = 0; |
120 | ||
1da177e4 LT |
121 | return ret; |
122 | } | |
123 | ||
a054a811 | 124 | #ifdef CONFIG_HOTPLUG_CPU |
10034aab RK |
125 | static void percpu_timer_stop(void); |
126 | ||
a054a811 RK |
127 | /* |
128 | * __cpu_disable runs on the processor to be shutdown. | |
129 | */ | |
90140c30 | 130 | int __cpu_disable(void) |
a054a811 RK |
131 | { |
132 | unsigned int cpu = smp_processor_id(); | |
133 | struct task_struct *p; | |
134 | int ret; | |
135 | ||
8e2a43f5 | 136 | ret = platform_cpu_disable(cpu); |
a054a811 RK |
137 | if (ret) |
138 | return ret; | |
139 | ||
140 | /* | |
141 | * Take this CPU offline. Once we clear this, we can't return, | |
142 | * and we must not schedule until we're ready to give up the cpu. | |
143 | */ | |
e03cdade | 144 | set_cpu_online(cpu, false); |
a054a811 RK |
145 | |
146 | /* | |
147 | * OK - migrate IRQs away from this CPU | |
148 | */ | |
149 | migrate_irqs(); | |
150 | ||
37ee16ae RK |
151 | /* |
152 | * Stop the local timer for this CPU. | |
153 | */ | |
10034aab | 154 | percpu_timer_stop(); |
37ee16ae | 155 | |
a054a811 RK |
156 | /* |
157 | * Flush user cache and TLB mappings, and then remove this CPU | |
158 | * from the vm mask set of all processes. | |
159 | */ | |
160 | flush_cache_all(); | |
161 | local_flush_tlb_all(); | |
162 | ||
163 | read_lock(&tasklist_lock); | |
164 | for_each_process(p) { | |
165 | if (p->mm) | |
56f8ba83 | 166 | cpumask_clear_cpu(cpu, mm_cpumask(p->mm)); |
a054a811 RK |
167 | } |
168 | read_unlock(&tasklist_lock); | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
3c030bea RK |
173 | static DECLARE_COMPLETION(cpu_died); |
174 | ||
a054a811 RK |
175 | /* |
176 | * called on the thread which is asking for a CPU to be shutdown - | |
177 | * waits until shutdown has completed, or it is timed out. | |
178 | */ | |
90140c30 | 179 | void __cpu_die(unsigned int cpu) |
a054a811 | 180 | { |
3c030bea RK |
181 | if (!wait_for_completion_timeout(&cpu_died, msecs_to_jiffies(5000))) { |
182 | pr_err("CPU%u: cpu didn't die\n", cpu); | |
183 | return; | |
184 | } | |
185 | printk(KERN_NOTICE "CPU%u: shutdown\n", cpu); | |
186 | ||
a054a811 RK |
187 | if (!platform_cpu_kill(cpu)) |
188 | printk("CPU%u: unable to kill\n", cpu); | |
189 | } | |
190 | ||
191 | /* | |
192 | * Called from the idle thread for the CPU which has been shutdown. | |
193 | * | |
194 | * Note that we disable IRQs here, but do not re-enable them | |
195 | * before returning to the caller. This is also the behaviour | |
196 | * of the other hotplug-cpu capable cores, so presumably coming | |
197 | * out of idle fixes this. | |
198 | */ | |
90140c30 | 199 | void __ref cpu_die(void) |
a054a811 RK |
200 | { |
201 | unsigned int cpu = smp_processor_id(); | |
202 | ||
a054a811 RK |
203 | idle_task_exit(); |
204 | ||
f36d3401 RK |
205 | local_irq_disable(); |
206 | mb(); | |
207 | ||
3c030bea RK |
208 | /* Tell __cpu_die() that this CPU is now safe to dispose of */ |
209 | complete(&cpu_died); | |
210 | ||
a054a811 RK |
211 | /* |
212 | * actual CPU shutdown procedure is at least platform (if not | |
3c030bea | 213 | * CPU) specific. |
a054a811 RK |
214 | */ |
215 | platform_cpu_die(cpu); | |
216 | ||
217 | /* | |
218 | * Do not return to the idle loop - jump back to the secondary | |
219 | * cpu initialisation. There's some initialisation which needs | |
220 | * to be repeated to undo the effects of taking the CPU offline. | |
221 | */ | |
222 | __asm__("mov sp, %0\n" | |
faabfa08 | 223 | " mov fp, #0\n" |
a054a811 RK |
224 | " b secondary_start_kernel" |
225 | : | |
32d39a93 | 226 | : "r" (task_stack_page(current) + THREAD_SIZE - 8)); |
a054a811 RK |
227 | } |
228 | #endif /* CONFIG_HOTPLUG_CPU */ | |
229 | ||
05c74a6c RK |
230 | /* |
231 | * Called by both boot and secondaries to move global data into | |
232 | * per-processor storage. | |
233 | */ | |
234 | static void __cpuinit smp_store_cpu_info(unsigned int cpuid) | |
235 | { | |
236 | struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid); | |
237 | ||
238 | cpu_info->loops_per_jiffy = loops_per_jiffy; | |
c9018aab VG |
239 | |
240 | store_cpu_topology(cpuid); | |
05c74a6c RK |
241 | } |
242 | ||
d4578592 MZ |
243 | static void percpu_timer_setup(void); |
244 | ||
e65f38ed RK |
245 | /* |
246 | * This is the secondary CPU boot entry. We're using this CPUs | |
247 | * idle thread stack, but a set of temporary page tables. | |
248 | */ | |
bd6f68af | 249 | asmlinkage void __cpuinit secondary_start_kernel(void) |
e65f38ed RK |
250 | { |
251 | struct mm_struct *mm = &init_mm; | |
da2660d2 | 252 | unsigned int cpu = smp_processor_id(); |
e65f38ed RK |
253 | |
254 | printk("CPU%u: Booted secondary processor\n", cpu); | |
255 | ||
256 | /* | |
257 | * All kernel threads share the same mm context; grab a | |
258 | * reference and switch to it. | |
259 | */ | |
e65f38ed RK |
260 | atomic_inc(&mm->mm_count); |
261 | current->active_mm = mm; | |
56f8ba83 | 262 | cpumask_set_cpu(cpu, mm_cpumask(mm)); |
e65f38ed RK |
263 | cpu_switch_mm(mm->pgd, mm); |
264 | enter_lazy_tlb(mm, current); | |
505d7b19 | 265 | local_flush_tlb_all(); |
e65f38ed RK |
266 | |
267 | cpu_init(); | |
5bfb5d69 | 268 | preempt_disable(); |
2c0136db | 269 | trace_hardirqs_off(); |
e65f38ed RK |
270 | |
271 | /* | |
272 | * Give the platform a chance to do its own initialisation. | |
273 | */ | |
274 | platform_secondary_init(cpu); | |
275 | ||
e545a614 | 276 | notify_cpu_starting(cpu); |
a8655e83 | 277 | |
e65f38ed RK |
278 | calibrate_delay(); |
279 | ||
280 | smp_store_cpu_info(cpu); | |
281 | ||
282 | /* | |
573619d1 RK |
283 | * OK, now it's safe to let the boot CPU continue. Wait for |
284 | * the CPU migration code to notice that the CPU is online | |
149c2415 | 285 | * before we continue - which happens after __cpu_up returns. |
e65f38ed | 286 | */ |
e03cdade | 287 | set_cpu_online(cpu, true); |
149c2415 | 288 | complete(&cpu_running); |
eb047454 TG |
289 | |
290 | /* | |
291 | * Setup the percpu timer for this CPU. | |
292 | */ | |
293 | percpu_timer_setup(); | |
294 | ||
eb047454 TG |
295 | local_irq_enable(); |
296 | local_fiq_enable(); | |
297 | ||
e65f38ed RK |
298 | /* |
299 | * OK, it's off to the idle thread for us | |
300 | */ | |
301 | cpu_idle(); | |
302 | } | |
303 | ||
1da177e4 LT |
304 | void __init smp_cpus_done(unsigned int max_cpus) |
305 | { | |
306 | int cpu; | |
307 | unsigned long bogosum = 0; | |
308 | ||
309 | for_each_online_cpu(cpu) | |
310 | bogosum += per_cpu(cpu_data, cpu).loops_per_jiffy; | |
311 | ||
312 | printk(KERN_INFO "SMP: Total of %d processors activated " | |
313 | "(%lu.%02lu BogoMIPS).\n", | |
314 | num_online_cpus(), | |
315 | bogosum / (500000/HZ), | |
316 | (bogosum / (5000/HZ)) % 100); | |
317 | } | |
318 | ||
319 | void __init smp_prepare_boot_cpu(void) | |
320 | { | |
321 | unsigned int cpu = smp_processor_id(); | |
322 | ||
71f512e8 | 323 | per_cpu(cpu_data, cpu).idle = current; |
1da177e4 LT |
324 | } |
325 | ||
05c74a6c | 326 | void __init smp_prepare_cpus(unsigned int max_cpus) |
1da177e4 | 327 | { |
05c74a6c | 328 | unsigned int ncores = num_possible_cpus(); |
1da177e4 | 329 | |
c9018aab VG |
330 | init_cpu_topology(); |
331 | ||
05c74a6c | 332 | smp_store_cpu_info(smp_processor_id()); |
1da177e4 LT |
333 | |
334 | /* | |
05c74a6c | 335 | * are we trying to boot more cores than exist? |
1da177e4 | 336 | */ |
05c74a6c RK |
337 | if (max_cpus > ncores) |
338 | max_cpus = ncores; | |
7fa22bd5 | 339 | if (ncores > 1 && max_cpus) { |
05c74a6c RK |
340 | /* |
341 | * Enable the local timer or broadcast device for the | |
342 | * boot CPU, but only if we have more than one CPU. | |
343 | */ | |
344 | percpu_timer_setup(); | |
1da177e4 | 345 | |
7fa22bd5 SB |
346 | /* |
347 | * Initialise the present map, which describes the set of CPUs | |
348 | * actually populated at the present time. A platform should | |
349 | * re-initialize the map in platform_smp_prepare_cpus() if | |
350 | * present != possible (e.g. physical hotplug). | |
351 | */ | |
0b5f9c00 | 352 | init_cpu_present(cpu_possible_mask); |
7fa22bd5 | 353 | |
05c74a6c RK |
354 | /* |
355 | * Initialise the SCU if there are more than one CPU | |
356 | * and let them know where to start. | |
357 | */ | |
358 | platform_smp_prepare_cpus(max_cpus); | |
359 | } | |
1da177e4 LT |
360 | } |
361 | ||
0f7b332f RK |
362 | static void (*smp_cross_call)(const struct cpumask *, unsigned int); |
363 | ||
364 | void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int)) | |
365 | { | |
366 | smp_cross_call = fn; | |
367 | } | |
368 | ||
82668104 | 369 | void arch_send_call_function_ipi_mask(const struct cpumask *mask) |
1da177e4 | 370 | { |
e3fbb087 | 371 | smp_cross_call(mask, IPI_CALL_FUNC); |
1da177e4 LT |
372 | } |
373 | ||
f6dd9fa5 | 374 | void arch_send_call_function_single_ipi(int cpu) |
3e459990 | 375 | { |
e3fbb087 | 376 | smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE); |
3e459990 | 377 | } |
3e459990 | 378 | |
4a88abd7 RK |
379 | static const char *ipi_types[NR_IPI] = { |
380 | #define S(x,s) [x - IPI_TIMER] = s | |
381 | S(IPI_TIMER, "Timer broadcast interrupts"), | |
382 | S(IPI_RESCHEDULE, "Rescheduling interrupts"), | |
383 | S(IPI_CALL_FUNC, "Function call interrupts"), | |
384 | S(IPI_CALL_FUNC_SINGLE, "Single function call interrupts"), | |
385 | S(IPI_CPU_STOP, "CPU stop interrupts"), | |
386 | }; | |
387 | ||
f13cd417 | 388 | void show_ipi_list(struct seq_file *p, int prec) |
1da177e4 | 389 | { |
4a88abd7 | 390 | unsigned int cpu, i; |
1da177e4 | 391 | |
4a88abd7 RK |
392 | for (i = 0; i < NR_IPI; i++) { |
393 | seq_printf(p, "%*s%u: ", prec - 1, "IPI", i); | |
1da177e4 | 394 | |
4a88abd7 RK |
395 | for_each_present_cpu(cpu) |
396 | seq_printf(p, "%10u ", | |
397 | __get_irq_stat(cpu, ipi_irqs[i])); | |
1da177e4 | 398 | |
4a88abd7 RK |
399 | seq_printf(p, " %s\n", ipi_types[i]); |
400 | } | |
1da177e4 LT |
401 | } |
402 | ||
b54992fe | 403 | u64 smp_irq_stat_cpu(unsigned int cpu) |
37ee16ae | 404 | { |
b54992fe RK |
405 | u64 sum = 0; |
406 | int i; | |
37ee16ae | 407 | |
b54992fe RK |
408 | for (i = 0; i < NR_IPI; i++) |
409 | sum += __get_irq_stat(cpu, ipi_irqs[i]); | |
37ee16ae | 410 | |
b54992fe | 411 | return sum; |
37ee16ae RK |
412 | } |
413 | ||
bc28248e RK |
414 | /* |
415 | * Timer (local or broadcast) support | |
416 | */ | |
417 | static DEFINE_PER_CPU(struct clock_event_device, percpu_clockevent); | |
418 | ||
c97d4869 | 419 | static void ipi_timer(void) |
1da177e4 | 420 | { |
bc28248e | 421 | struct clock_event_device *evt = &__get_cpu_var(percpu_clockevent); |
bc28248e | 422 | evt->event_handler(evt); |
1da177e4 LT |
423 | } |
424 | ||
bc28248e RK |
425 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
426 | static void smp_timer_broadcast(const struct cpumask *mask) | |
427 | { | |
e3fbb087 | 428 | smp_cross_call(mask, IPI_TIMER); |
bc28248e | 429 | } |
5388a6b2 RK |
430 | #else |
431 | #define smp_timer_broadcast NULL | |
432 | #endif | |
bc28248e RK |
433 | |
434 | static void broadcast_timer_set_mode(enum clock_event_mode mode, | |
435 | struct clock_event_device *evt) | |
436 | { | |
437 | } | |
438 | ||
a8d2518c | 439 | static void __cpuinit broadcast_timer_setup(struct clock_event_device *evt) |
bc28248e RK |
440 | { |
441 | evt->name = "dummy_timer"; | |
442 | evt->features = CLOCK_EVT_FEAT_ONESHOT | | |
443 | CLOCK_EVT_FEAT_PERIODIC | | |
444 | CLOCK_EVT_FEAT_DUMMY; | |
445 | evt->rating = 400; | |
446 | evt->mult = 1; | |
447 | evt->set_mode = broadcast_timer_set_mode; | |
bc28248e RK |
448 | |
449 | clockevents_register_device(evt); | |
450 | } | |
bc28248e | 451 | |
0ef330e1 MZ |
452 | static struct local_timer_ops *lt_ops; |
453 | ||
454 | #ifdef CONFIG_LOCAL_TIMERS | |
455 | int local_timer_register(struct local_timer_ops *ops) | |
456 | { | |
457 | if (lt_ops) | |
458 | return -EBUSY; | |
459 | ||
460 | lt_ops = ops; | |
461 | return 0; | |
462 | } | |
463 | #endif | |
464 | ||
d4578592 | 465 | static void __cpuinit percpu_timer_setup(void) |
bc28248e RK |
466 | { |
467 | unsigned int cpu = smp_processor_id(); | |
468 | struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu); | |
469 | ||
470 | evt->cpumask = cpumask_of(cpu); | |
5388a6b2 | 471 | evt->broadcast = smp_timer_broadcast; |
bc28248e | 472 | |
d4578592 | 473 | if (!lt_ops || lt_ops->setup(evt)) |
af90f10d | 474 | broadcast_timer_setup(evt); |
bc28248e RK |
475 | } |
476 | ||
10034aab RK |
477 | #ifdef CONFIG_HOTPLUG_CPU |
478 | /* | |
479 | * The generic clock events code purposely does not stop the local timer | |
480 | * on CPU_DEAD/CPU_DEAD_FROZEN hotplug events, so we have to do it | |
481 | * manually here. | |
482 | */ | |
483 | static void percpu_timer_stop(void) | |
484 | { | |
485 | unsigned int cpu = smp_processor_id(); | |
486 | struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu); | |
487 | ||
d4578592 MZ |
488 | if (lt_ops) |
489 | lt_ops->stop(evt); | |
10034aab RK |
490 | } |
491 | #endif | |
492 | ||
bd31b859 | 493 | static DEFINE_RAW_SPINLOCK(stop_lock); |
1da177e4 LT |
494 | |
495 | /* | |
496 | * ipi_cpu_stop - handle IPI from smp_send_stop() | |
497 | */ | |
498 | static void ipi_cpu_stop(unsigned int cpu) | |
499 | { | |
3d3f78d7 RK |
500 | if (system_state == SYSTEM_BOOTING || |
501 | system_state == SYSTEM_RUNNING) { | |
bd31b859 | 502 | raw_spin_lock(&stop_lock); |
3d3f78d7 RK |
503 | printk(KERN_CRIT "CPU%u: stopping\n", cpu); |
504 | dump_stack(); | |
bd31b859 | 505 | raw_spin_unlock(&stop_lock); |
3d3f78d7 | 506 | } |
1da177e4 | 507 | |
e03cdade | 508 | set_cpu_online(cpu, false); |
1da177e4 LT |
509 | |
510 | local_fiq_disable(); | |
511 | local_irq_disable(); | |
512 | ||
02b73e2e WD |
513 | #ifdef CONFIG_HOTPLUG_CPU |
514 | platform_cpu_kill(cpu); | |
515 | #endif | |
516 | ||
1da177e4 LT |
517 | while (1) |
518 | cpu_relax(); | |
519 | } | |
520 | ||
521 | /* | |
522 | * Main handler for inter-processor interrupts | |
1da177e4 | 523 | */ |
4073723a | 524 | asmlinkage void __exception_irq_entry do_IPI(int ipinr, struct pt_regs *regs) |
0b5a1b95 SG |
525 | { |
526 | handle_IPI(ipinr, regs); | |
527 | } | |
528 | ||
529 | void handle_IPI(int ipinr, struct pt_regs *regs) | |
1da177e4 LT |
530 | { |
531 | unsigned int cpu = smp_processor_id(); | |
c97d4869 | 532 | struct pt_regs *old_regs = set_irq_regs(regs); |
1da177e4 | 533 | |
4a88abd7 RK |
534 | if (ipinr >= IPI_TIMER && ipinr < IPI_TIMER + NR_IPI) |
535 | __inc_irq_stat(cpu, ipi_irqs[ipinr - IPI_TIMER]); | |
1da177e4 | 536 | |
24480d98 RK |
537 | switch (ipinr) { |
538 | case IPI_TIMER: | |
7deabca0 | 539 | irq_enter(); |
24480d98 | 540 | ipi_timer(); |
7deabca0 | 541 | irq_exit(); |
24480d98 | 542 | break; |
1da177e4 | 543 | |
24480d98 | 544 | case IPI_RESCHEDULE: |
184748cc | 545 | scheduler_ipi(); |
24480d98 | 546 | break; |
1da177e4 | 547 | |
24480d98 | 548 | case IPI_CALL_FUNC: |
7deabca0 | 549 | irq_enter(); |
24480d98 | 550 | generic_smp_call_function_interrupt(); |
7deabca0 | 551 | irq_exit(); |
24480d98 | 552 | break; |
f6dd9fa5 | 553 | |
24480d98 | 554 | case IPI_CALL_FUNC_SINGLE: |
7deabca0 | 555 | irq_enter(); |
24480d98 | 556 | generic_smp_call_function_single_interrupt(); |
7deabca0 | 557 | irq_exit(); |
24480d98 | 558 | break; |
1da177e4 | 559 | |
24480d98 | 560 | case IPI_CPU_STOP: |
7deabca0 | 561 | irq_enter(); |
24480d98 | 562 | ipi_cpu_stop(cpu); |
7deabca0 | 563 | irq_exit(); |
24480d98 | 564 | break; |
1da177e4 | 565 | |
24480d98 RK |
566 | default: |
567 | printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%x\n", | |
568 | cpu, ipinr); | |
569 | break; | |
1da177e4 | 570 | } |
c97d4869 | 571 | set_irq_regs(old_regs); |
1da177e4 LT |
572 | } |
573 | ||
574 | void smp_send_reschedule(int cpu) | |
575 | { | |
e3fbb087 | 576 | smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE); |
1da177e4 LT |
577 | } |
578 | ||
1da177e4 LT |
579 | void smp_send_stop(void) |
580 | { | |
28e18293 | 581 | unsigned long timeout; |
1da177e4 | 582 | |
28e18293 | 583 | if (num_online_cpus() > 1) { |
0b5f9c00 RR |
584 | struct cpumask mask; |
585 | cpumask_copy(&mask, cpu_online_mask); | |
586 | cpumask_clear_cpu(smp_processor_id(), &mask); | |
4b0ef3b1 | 587 | |
e3fbb087 | 588 | smp_cross_call(&mask, IPI_CPU_STOP); |
28e18293 | 589 | } |
4b0ef3b1 | 590 | |
28e18293 RK |
591 | /* Wait up to one second for other CPUs to stop */ |
592 | timeout = USEC_PER_SEC; | |
593 | while (num_online_cpus() > 1 && timeout--) | |
594 | udelay(1); | |
4b0ef3b1 | 595 | |
28e18293 RK |
596 | if (num_online_cpus() > 1) |
597 | pr_warning("SMP: failed to stop secondary CPUs\n"); | |
4b0ef3b1 RK |
598 | } |
599 | ||
4b0ef3b1 | 600 | /* |
1da177e4 | 601 | * not supported here |
4b0ef3b1 | 602 | */ |
5048bcba | 603 | int setup_profiling_timer(unsigned int multiplier) |
4b0ef3b1 | 604 | { |
1da177e4 | 605 | return -EINVAL; |
4b0ef3b1 | 606 | } |