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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> |
1da177e4 LT |
25 | |
26 | #include <asm/atomic.h> | |
27 | #include <asm/cacheflush.h> | |
28 | #include <asm/cpu.h> | |
e65f38ed RK |
29 | #include <asm/mmu_context.h> |
30 | #include <asm/pgtable.h> | |
31 | #include <asm/pgalloc.h> | |
1da177e4 LT |
32 | #include <asm/processor.h> |
33 | #include <asm/tlbflush.h> | |
34 | #include <asm/ptrace.h> | |
35 | ||
36 | /* | |
37 | * bitmask of present and online CPUs. | |
38 | * The present bitmask indicates that the CPU is physically present. | |
39 | * The online bitmask indicates that the CPU is up and running. | |
40 | */ | |
d12734d1 | 41 | cpumask_t cpu_possible_map; |
e16b38f7 | 42 | EXPORT_SYMBOL(cpu_possible_map); |
1da177e4 | 43 | cpumask_t cpu_online_map; |
e16b38f7 | 44 | EXPORT_SYMBOL(cpu_online_map); |
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 LT |
53 | /* |
54 | * structures for inter-processor calls | |
55 | * - A collection of single bit ipi messages. | |
56 | */ | |
57 | struct ipi_data { | |
58 | spinlock_t lock; | |
59 | unsigned long ipi_count; | |
60 | unsigned long bits; | |
61 | }; | |
62 | ||
63 | static DEFINE_PER_CPU(struct ipi_data, ipi_data) = { | |
64 | .lock = SPIN_LOCK_UNLOCKED, | |
65 | }; | |
66 | ||
67 | enum ipi_msg_type { | |
68 | IPI_TIMER, | |
69 | IPI_RESCHEDULE, | |
70 | IPI_CALL_FUNC, | |
71 | IPI_CPU_STOP, | |
72 | }; | |
73 | ||
74 | struct smp_call_struct { | |
75 | void (*func)(void *info); | |
76 | void *info; | |
77 | int wait; | |
78 | cpumask_t pending; | |
79 | cpumask_t unfinished; | |
80 | }; | |
81 | ||
82 | static struct smp_call_struct * volatile smp_call_function_data; | |
83 | static DEFINE_SPINLOCK(smp_call_function_lock); | |
84 | ||
bd6f68af | 85 | int __cpuinit __cpu_up(unsigned int cpu) |
1da177e4 | 86 | { |
71f512e8 RK |
87 | struct cpuinfo_arm *ci = &per_cpu(cpu_data, cpu); |
88 | struct task_struct *idle = ci->idle; | |
e65f38ed RK |
89 | pgd_t *pgd; |
90 | pmd_t *pmd; | |
1da177e4 LT |
91 | int ret; |
92 | ||
93 | /* | |
71f512e8 RK |
94 | * Spawn a new process manually, if not already done. |
95 | * Grab a pointer to its task struct so we can mess with it | |
1da177e4 | 96 | */ |
71f512e8 RK |
97 | if (!idle) { |
98 | idle = fork_idle(cpu); | |
99 | if (IS_ERR(idle)) { | |
100 | printk(KERN_ERR "CPU%u: fork() failed\n", cpu); | |
101 | return PTR_ERR(idle); | |
102 | } | |
103 | ci->idle = idle; | |
1da177e4 LT |
104 | } |
105 | ||
e65f38ed RK |
106 | /* |
107 | * Allocate initial page tables to allow the new CPU to | |
108 | * enable the MMU safely. This essentially means a set | |
109 | * of our "standard" page tables, with the addition of | |
110 | * a 1:1 mapping for the physical address of the kernel. | |
111 | */ | |
112 | pgd = pgd_alloc(&init_mm); | |
113 | pmd = pmd_offset(pgd, PHYS_OFFSET); | |
114 | *pmd = __pmd((PHYS_OFFSET & PGDIR_MASK) | | |
115 | PMD_TYPE_SECT | PMD_SECT_AP_WRITE); | |
116 | ||
117 | /* | |
118 | * We need to tell the secondary core where to find | |
119 | * its stack and the page tables. | |
120 | */ | |
32d39a93 | 121 | secondary_data.stack = task_stack_page(idle) + THREAD_START_SP; |
e65f38ed RK |
122 | secondary_data.pgdir = virt_to_phys(pgd); |
123 | wmb(); | |
124 | ||
1da177e4 LT |
125 | /* |
126 | * Now bring the CPU into our world. | |
127 | */ | |
128 | ret = boot_secondary(cpu, idle); | |
e65f38ed RK |
129 | if (ret == 0) { |
130 | unsigned long timeout; | |
131 | ||
132 | /* | |
133 | * CPU was successfully started, wait for it | |
134 | * to come online or time out. | |
135 | */ | |
136 | timeout = jiffies + HZ; | |
137 | while (time_before(jiffies, timeout)) { | |
138 | if (cpu_online(cpu)) | |
139 | break; | |
140 | ||
141 | udelay(10); | |
142 | barrier(); | |
143 | } | |
144 | ||
145 | if (!cpu_online(cpu)) | |
146 | ret = -EIO; | |
147 | } | |
148 | ||
5d43045b | 149 | secondary_data.stack = NULL; |
e65f38ed RK |
150 | secondary_data.pgdir = 0; |
151 | ||
152 | *pmd_offset(pgd, PHYS_OFFSET) = __pmd(0); | |
5e541973 | 153 | pgd_free(&init_mm, pgd); |
e65f38ed | 154 | |
1da177e4 | 155 | if (ret) { |
0908db22 RK |
156 | printk(KERN_CRIT "CPU%u: processor failed to boot\n", cpu); |
157 | ||
1da177e4 LT |
158 | /* |
159 | * FIXME: We need to clean up the new idle thread. --rmk | |
160 | */ | |
161 | } | |
162 | ||
163 | return ret; | |
164 | } | |
165 | ||
a054a811 RK |
166 | #ifdef CONFIG_HOTPLUG_CPU |
167 | /* | |
168 | * __cpu_disable runs on the processor to be shutdown. | |
169 | */ | |
170 | int __cpuexit __cpu_disable(void) | |
171 | { | |
172 | unsigned int cpu = smp_processor_id(); | |
173 | struct task_struct *p; | |
174 | int ret; | |
175 | ||
176 | ret = mach_cpu_disable(cpu); | |
177 | if (ret) | |
178 | return ret; | |
179 | ||
180 | /* | |
181 | * Take this CPU offline. Once we clear this, we can't return, | |
182 | * and we must not schedule until we're ready to give up the cpu. | |
183 | */ | |
184 | cpu_clear(cpu, cpu_online_map); | |
185 | ||
186 | /* | |
187 | * OK - migrate IRQs away from this CPU | |
188 | */ | |
189 | migrate_irqs(); | |
190 | ||
37ee16ae RK |
191 | /* |
192 | * Stop the local timer for this CPU. | |
193 | */ | |
194 | local_timer_stop(cpu); | |
195 | ||
a054a811 RK |
196 | /* |
197 | * Flush user cache and TLB mappings, and then remove this CPU | |
198 | * from the vm mask set of all processes. | |
199 | */ | |
200 | flush_cache_all(); | |
201 | local_flush_tlb_all(); | |
202 | ||
203 | read_lock(&tasklist_lock); | |
204 | for_each_process(p) { | |
205 | if (p->mm) | |
206 | cpu_clear(cpu, p->mm->cpu_vm_mask); | |
207 | } | |
208 | read_unlock(&tasklist_lock); | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
213 | /* | |
214 | * called on the thread which is asking for a CPU to be shutdown - | |
215 | * waits until shutdown has completed, or it is timed out. | |
216 | */ | |
217 | void __cpuexit __cpu_die(unsigned int cpu) | |
218 | { | |
219 | if (!platform_cpu_kill(cpu)) | |
220 | printk("CPU%u: unable to kill\n", cpu); | |
221 | } | |
222 | ||
223 | /* | |
224 | * Called from the idle thread for the CPU which has been shutdown. | |
225 | * | |
226 | * Note that we disable IRQs here, but do not re-enable them | |
227 | * before returning to the caller. This is also the behaviour | |
228 | * of the other hotplug-cpu capable cores, so presumably coming | |
229 | * out of idle fixes this. | |
230 | */ | |
231 | void __cpuexit cpu_die(void) | |
232 | { | |
233 | unsigned int cpu = smp_processor_id(); | |
234 | ||
235 | local_irq_disable(); | |
236 | idle_task_exit(); | |
237 | ||
238 | /* | |
239 | * actual CPU shutdown procedure is at least platform (if not | |
240 | * CPU) specific | |
241 | */ | |
242 | platform_cpu_die(cpu); | |
243 | ||
244 | /* | |
245 | * Do not return to the idle loop - jump back to the secondary | |
246 | * cpu initialisation. There's some initialisation which needs | |
247 | * to be repeated to undo the effects of taking the CPU offline. | |
248 | */ | |
249 | __asm__("mov sp, %0\n" | |
250 | " b secondary_start_kernel" | |
251 | : | |
32d39a93 | 252 | : "r" (task_stack_page(current) + THREAD_SIZE - 8)); |
a054a811 RK |
253 | } |
254 | #endif /* CONFIG_HOTPLUG_CPU */ | |
255 | ||
e65f38ed RK |
256 | /* |
257 | * This is the secondary CPU boot entry. We're using this CPUs | |
258 | * idle thread stack, but a set of temporary page tables. | |
259 | */ | |
bd6f68af | 260 | asmlinkage void __cpuinit secondary_start_kernel(void) |
e65f38ed RK |
261 | { |
262 | struct mm_struct *mm = &init_mm; | |
da2660d2 | 263 | unsigned int cpu = smp_processor_id(); |
e65f38ed RK |
264 | |
265 | printk("CPU%u: Booted secondary processor\n", cpu); | |
266 | ||
267 | /* | |
268 | * All kernel threads share the same mm context; grab a | |
269 | * reference and switch to it. | |
270 | */ | |
271 | atomic_inc(&mm->mm_users); | |
272 | atomic_inc(&mm->mm_count); | |
273 | current->active_mm = mm; | |
274 | cpu_set(cpu, mm->cpu_vm_mask); | |
275 | cpu_switch_mm(mm->pgd, mm); | |
276 | enter_lazy_tlb(mm, current); | |
505d7b19 | 277 | local_flush_tlb_all(); |
e65f38ed RK |
278 | |
279 | cpu_init(); | |
5bfb5d69 | 280 | preempt_disable(); |
e65f38ed RK |
281 | |
282 | /* | |
283 | * Give the platform a chance to do its own initialisation. | |
284 | */ | |
285 | platform_secondary_init(cpu); | |
286 | ||
287 | /* | |
288 | * Enable local interrupts. | |
289 | */ | |
290 | local_irq_enable(); | |
291 | local_fiq_enable(); | |
292 | ||
a8655e83 CM |
293 | /* |
294 | * Setup local timer for this CPU. | |
295 | */ | |
296 | local_timer_setup(cpu); | |
297 | ||
e65f38ed RK |
298 | calibrate_delay(); |
299 | ||
300 | smp_store_cpu_info(cpu); | |
301 | ||
302 | /* | |
303 | * OK, now it's safe to let the boot CPU continue | |
304 | */ | |
305 | cpu_set(cpu, cpu_online_map); | |
306 | ||
307 | /* | |
308 | * OK, it's off to the idle thread for us | |
309 | */ | |
310 | cpu_idle(); | |
311 | } | |
312 | ||
1da177e4 LT |
313 | /* |
314 | * Called by both boot and secondaries to move global data into | |
315 | * per-processor storage. | |
316 | */ | |
bd6f68af | 317 | void __cpuinit smp_store_cpu_info(unsigned int cpuid) |
1da177e4 LT |
318 | { |
319 | struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid); | |
320 | ||
321 | cpu_info->loops_per_jiffy = loops_per_jiffy; | |
322 | } | |
323 | ||
324 | void __init smp_cpus_done(unsigned int max_cpus) | |
325 | { | |
326 | int cpu; | |
327 | unsigned long bogosum = 0; | |
328 | ||
329 | for_each_online_cpu(cpu) | |
330 | bogosum += per_cpu(cpu_data, cpu).loops_per_jiffy; | |
331 | ||
332 | printk(KERN_INFO "SMP: Total of %d processors activated " | |
333 | "(%lu.%02lu BogoMIPS).\n", | |
334 | num_online_cpus(), | |
335 | bogosum / (500000/HZ), | |
336 | (bogosum / (5000/HZ)) % 100); | |
337 | } | |
338 | ||
339 | void __init smp_prepare_boot_cpu(void) | |
340 | { | |
341 | unsigned int cpu = smp_processor_id(); | |
342 | ||
71f512e8 | 343 | per_cpu(cpu_data, cpu).idle = current; |
1da177e4 LT |
344 | } |
345 | ||
346 | static void send_ipi_message(cpumask_t callmap, enum ipi_msg_type msg) | |
347 | { | |
348 | unsigned long flags; | |
349 | unsigned int cpu; | |
350 | ||
351 | local_irq_save(flags); | |
352 | ||
353 | for_each_cpu_mask(cpu, callmap) { | |
354 | struct ipi_data *ipi = &per_cpu(ipi_data, cpu); | |
355 | ||
356 | spin_lock(&ipi->lock); | |
357 | ipi->bits |= 1 << msg; | |
358 | spin_unlock(&ipi->lock); | |
359 | } | |
360 | ||
361 | /* | |
362 | * Call the platform specific cross-CPU call function. | |
363 | */ | |
364 | smp_cross_call(callmap); | |
365 | ||
366 | local_irq_restore(flags); | |
367 | } | |
368 | ||
369 | /* | |
370 | * You must not call this function with disabled interrupts, from a | |
371 | * hardware interrupt handler, nor from a bottom half handler. | |
372 | */ | |
5d43045b RK |
373 | static int smp_call_function_on_cpu(void (*func)(void *info), void *info, |
374 | int retry, int wait, cpumask_t callmap) | |
1da177e4 LT |
375 | { |
376 | struct smp_call_struct data; | |
377 | unsigned long timeout; | |
378 | int ret = 0; | |
379 | ||
380 | data.func = func; | |
381 | data.info = info; | |
382 | data.wait = wait; | |
383 | ||
384 | cpu_clear(smp_processor_id(), callmap); | |
385 | if (cpus_empty(callmap)) | |
386 | goto out; | |
387 | ||
388 | data.pending = callmap; | |
389 | if (wait) | |
390 | data.unfinished = callmap; | |
391 | ||
392 | /* | |
393 | * try to get the mutex on smp_call_function_data | |
394 | */ | |
395 | spin_lock(&smp_call_function_lock); | |
396 | smp_call_function_data = &data; | |
397 | ||
398 | send_ipi_message(callmap, IPI_CALL_FUNC); | |
399 | ||
400 | timeout = jiffies + HZ; | |
401 | while (!cpus_empty(data.pending) && time_before(jiffies, timeout)) | |
402 | barrier(); | |
403 | ||
404 | /* | |
405 | * did we time out? | |
406 | */ | |
407 | if (!cpus_empty(data.pending)) { | |
408 | /* | |
409 | * this may be causing our panic - report it | |
410 | */ | |
411 | printk(KERN_CRIT | |
412 | "CPU%u: smp_call_function timeout for %p(%p)\n" | |
413 | " callmap %lx pending %lx, %swait\n", | |
273c2cdb RK |
414 | smp_processor_id(), func, info, *cpus_addr(callmap), |
415 | *cpus_addr(data.pending), wait ? "" : "no "); | |
1da177e4 LT |
416 | |
417 | /* | |
418 | * TRACE | |
419 | */ | |
420 | timeout = jiffies + (5 * HZ); | |
421 | while (!cpus_empty(data.pending) && time_before(jiffies, timeout)) | |
422 | barrier(); | |
423 | ||
424 | if (cpus_empty(data.pending)) | |
425 | printk(KERN_CRIT " RESOLVED\n"); | |
426 | else | |
427 | printk(KERN_CRIT " STILL STUCK\n"); | |
428 | } | |
429 | ||
430 | /* | |
431 | * whatever happened, we're done with the data, so release it | |
432 | */ | |
433 | smp_call_function_data = NULL; | |
434 | spin_unlock(&smp_call_function_lock); | |
435 | ||
436 | if (!cpus_empty(data.pending)) { | |
437 | ret = -ETIMEDOUT; | |
438 | goto out; | |
439 | } | |
440 | ||
441 | if (wait) | |
442 | while (!cpus_empty(data.unfinished)) | |
443 | barrier(); | |
444 | out: | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
449 | int smp_call_function(void (*func)(void *info), void *info, int retry, | |
450 | int wait) | |
451 | { | |
452 | return smp_call_function_on_cpu(func, info, retry, wait, | |
453 | cpu_online_map); | |
454 | } | |
e730bf96 | 455 | EXPORT_SYMBOL_GPL(smp_call_function); |
1da177e4 | 456 | |
3e459990 CM |
457 | int smp_call_function_single(int cpu, void (*func)(void *info), void *info, |
458 | int retry, int wait) | |
459 | { | |
460 | /* prevent preemption and reschedule on another processor */ | |
461 | int current_cpu = get_cpu(); | |
462 | int ret = 0; | |
463 | ||
464 | if (cpu == current_cpu) { | |
465 | local_irq_disable(); | |
466 | func(info); | |
467 | local_irq_enable(); | |
468 | } else | |
469 | ret = smp_call_function_on_cpu(func, info, retry, wait, | |
470 | cpumask_of_cpu(cpu)); | |
471 | ||
472 | put_cpu(); | |
473 | ||
474 | return ret; | |
475 | } | |
476 | EXPORT_SYMBOL_GPL(smp_call_function_single); | |
477 | ||
1da177e4 LT |
478 | void show_ipi_list(struct seq_file *p) |
479 | { | |
480 | unsigned int cpu; | |
481 | ||
482 | seq_puts(p, "IPI:"); | |
483 | ||
e11b2236 | 484 | for_each_present_cpu(cpu) |
1da177e4 LT |
485 | seq_printf(p, " %10lu", per_cpu(ipi_data, cpu).ipi_count); |
486 | ||
487 | seq_putc(p, '\n'); | |
488 | } | |
489 | ||
37ee16ae RK |
490 | void show_local_irqs(struct seq_file *p) |
491 | { | |
492 | unsigned int cpu; | |
493 | ||
494 | seq_printf(p, "LOC: "); | |
495 | ||
496 | for_each_present_cpu(cpu) | |
497 | seq_printf(p, "%10u ", irq_stat[cpu].local_timer_irqs); | |
498 | ||
499 | seq_putc(p, '\n'); | |
500 | } | |
501 | ||
c97d4869 | 502 | static void ipi_timer(void) |
1da177e4 | 503 | { |
1da177e4 | 504 | irq_enter(); |
3e459990 | 505 | local_timer_interrupt(); |
1da177e4 LT |
506 | irq_exit(); |
507 | } | |
508 | ||
37ee16ae | 509 | #ifdef CONFIG_LOCAL_TIMERS |
b9811d7f | 510 | asmlinkage void __exception do_local_timer(struct pt_regs *regs) |
37ee16ae | 511 | { |
c97d4869 | 512 | struct pt_regs *old_regs = set_irq_regs(regs); |
37ee16ae RK |
513 | int cpu = smp_processor_id(); |
514 | ||
515 | if (local_timer_ack()) { | |
516 | irq_stat[cpu].local_timer_irqs++; | |
c97d4869 | 517 | ipi_timer(); |
37ee16ae | 518 | } |
c97d4869 RK |
519 | |
520 | set_irq_regs(old_regs); | |
37ee16ae RK |
521 | } |
522 | #endif | |
523 | ||
1da177e4 LT |
524 | /* |
525 | * ipi_call_function - handle IPI from smp_call_function() | |
526 | * | |
527 | * Note that we copy data out of the cross-call structure and then | |
528 | * let the caller know that we're here and have done with their data | |
529 | */ | |
530 | static void ipi_call_function(unsigned int cpu) | |
531 | { | |
532 | struct smp_call_struct *data = smp_call_function_data; | |
533 | void (*func)(void *info) = data->func; | |
534 | void *info = data->info; | |
535 | int wait = data->wait; | |
536 | ||
537 | cpu_clear(cpu, data->pending); | |
538 | ||
539 | func(info); | |
540 | ||
541 | if (wait) | |
542 | cpu_clear(cpu, data->unfinished); | |
543 | } | |
544 | ||
545 | static DEFINE_SPINLOCK(stop_lock); | |
546 | ||
547 | /* | |
548 | * ipi_cpu_stop - handle IPI from smp_send_stop() | |
549 | */ | |
550 | static void ipi_cpu_stop(unsigned int cpu) | |
551 | { | |
552 | spin_lock(&stop_lock); | |
553 | printk(KERN_CRIT "CPU%u: stopping\n", cpu); | |
554 | dump_stack(); | |
555 | spin_unlock(&stop_lock); | |
556 | ||
557 | cpu_clear(cpu, cpu_online_map); | |
558 | ||
559 | local_fiq_disable(); | |
560 | local_irq_disable(); | |
561 | ||
562 | while (1) | |
563 | cpu_relax(); | |
564 | } | |
565 | ||
566 | /* | |
567 | * Main handler for inter-processor interrupts | |
568 | * | |
569 | * For ARM, the ipimask now only identifies a single | |
570 | * category of IPI (Bit 1 IPIs have been replaced by a | |
571 | * different mechanism): | |
572 | * | |
573 | * Bit 0 - Inter-processor function call | |
574 | */ | |
b9811d7f | 575 | asmlinkage void __exception do_IPI(struct pt_regs *regs) |
1da177e4 LT |
576 | { |
577 | unsigned int cpu = smp_processor_id(); | |
578 | struct ipi_data *ipi = &per_cpu(ipi_data, cpu); | |
c97d4869 | 579 | struct pt_regs *old_regs = set_irq_regs(regs); |
1da177e4 LT |
580 | |
581 | ipi->ipi_count++; | |
582 | ||
583 | for (;;) { | |
584 | unsigned long msgs; | |
585 | ||
586 | spin_lock(&ipi->lock); | |
587 | msgs = ipi->bits; | |
588 | ipi->bits = 0; | |
589 | spin_unlock(&ipi->lock); | |
590 | ||
591 | if (!msgs) | |
592 | break; | |
593 | ||
594 | do { | |
595 | unsigned nextmsg; | |
596 | ||
597 | nextmsg = msgs & -msgs; | |
598 | msgs &= ~nextmsg; | |
599 | nextmsg = ffz(~nextmsg); | |
600 | ||
601 | switch (nextmsg) { | |
602 | case IPI_TIMER: | |
c97d4869 | 603 | ipi_timer(); |
1da177e4 LT |
604 | break; |
605 | ||
606 | case IPI_RESCHEDULE: | |
607 | /* | |
608 | * nothing more to do - eveything is | |
609 | * done on the interrupt return path | |
610 | */ | |
611 | break; | |
612 | ||
613 | case IPI_CALL_FUNC: | |
614 | ipi_call_function(cpu); | |
615 | break; | |
616 | ||
617 | case IPI_CPU_STOP: | |
618 | ipi_cpu_stop(cpu); | |
619 | break; | |
620 | ||
621 | default: | |
622 | printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%x\n", | |
623 | cpu, nextmsg); | |
624 | break; | |
625 | } | |
626 | } while (msgs); | |
627 | } | |
c97d4869 RK |
628 | |
629 | set_irq_regs(old_regs); | |
1da177e4 LT |
630 | } |
631 | ||
632 | void smp_send_reschedule(int cpu) | |
633 | { | |
634 | send_ipi_message(cpumask_of_cpu(cpu), IPI_RESCHEDULE); | |
635 | } | |
636 | ||
637 | void smp_send_timer(void) | |
638 | { | |
639 | cpumask_t mask = cpu_online_map; | |
640 | cpu_clear(smp_processor_id(), mask); | |
641 | send_ipi_message(mask, IPI_TIMER); | |
642 | } | |
643 | ||
3e459990 CM |
644 | void smp_timer_broadcast(cpumask_t mask) |
645 | { | |
646 | send_ipi_message(mask, IPI_TIMER); | |
647 | } | |
648 | ||
1da177e4 LT |
649 | void smp_send_stop(void) |
650 | { | |
651 | cpumask_t mask = cpu_online_map; | |
652 | cpu_clear(smp_processor_id(), mask); | |
653 | send_ipi_message(mask, IPI_CPU_STOP); | |
654 | } | |
655 | ||
656 | /* | |
657 | * not supported here | |
658 | */ | |
5048bcba | 659 | int setup_profiling_timer(unsigned int multiplier) |
1da177e4 LT |
660 | { |
661 | return -EINVAL; | |
662 | } | |
4b0ef3b1 RK |
663 | |
664 | static int | |
665 | on_each_cpu_mask(void (*func)(void *), void *info, int retry, int wait, | |
666 | cpumask_t mask) | |
667 | { | |
668 | int ret = 0; | |
669 | ||
670 | preempt_disable(); | |
671 | ||
672 | ret = smp_call_function_on_cpu(func, info, retry, wait, mask); | |
673 | if (cpu_isset(smp_processor_id(), mask)) | |
674 | func(info); | |
675 | ||
676 | preempt_enable(); | |
677 | ||
678 | return ret; | |
679 | } | |
680 | ||
681 | /**********************************************************************/ | |
682 | ||
683 | /* | |
684 | * TLB operations | |
685 | */ | |
686 | struct tlb_args { | |
687 | struct vm_area_struct *ta_vma; | |
688 | unsigned long ta_start; | |
689 | unsigned long ta_end; | |
690 | }; | |
691 | ||
692 | static inline void ipi_flush_tlb_all(void *ignored) | |
693 | { | |
694 | local_flush_tlb_all(); | |
695 | } | |
696 | ||
697 | static inline void ipi_flush_tlb_mm(void *arg) | |
698 | { | |
699 | struct mm_struct *mm = (struct mm_struct *)arg; | |
700 | ||
701 | local_flush_tlb_mm(mm); | |
702 | } | |
703 | ||
704 | static inline void ipi_flush_tlb_page(void *arg) | |
705 | { | |
706 | struct tlb_args *ta = (struct tlb_args *)arg; | |
707 | ||
708 | local_flush_tlb_page(ta->ta_vma, ta->ta_start); | |
709 | } | |
710 | ||
711 | static inline void ipi_flush_tlb_kernel_page(void *arg) | |
712 | { | |
713 | struct tlb_args *ta = (struct tlb_args *)arg; | |
714 | ||
715 | local_flush_tlb_kernel_page(ta->ta_start); | |
716 | } | |
717 | ||
718 | static inline void ipi_flush_tlb_range(void *arg) | |
719 | { | |
720 | struct tlb_args *ta = (struct tlb_args *)arg; | |
721 | ||
722 | local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end); | |
723 | } | |
724 | ||
725 | static inline void ipi_flush_tlb_kernel_range(void *arg) | |
726 | { | |
727 | struct tlb_args *ta = (struct tlb_args *)arg; | |
728 | ||
729 | local_flush_tlb_kernel_range(ta->ta_start, ta->ta_end); | |
730 | } | |
731 | ||
732 | void flush_tlb_all(void) | |
733 | { | |
734 | on_each_cpu(ipi_flush_tlb_all, NULL, 1, 1); | |
735 | } | |
736 | ||
737 | void flush_tlb_mm(struct mm_struct *mm) | |
738 | { | |
739 | cpumask_t mask = mm->cpu_vm_mask; | |
740 | ||
741 | on_each_cpu_mask(ipi_flush_tlb_mm, mm, 1, 1, mask); | |
742 | } | |
743 | ||
744 | void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr) | |
745 | { | |
746 | cpumask_t mask = vma->vm_mm->cpu_vm_mask; | |
747 | struct tlb_args ta; | |
748 | ||
749 | ta.ta_vma = vma; | |
750 | ta.ta_start = uaddr; | |
751 | ||
752 | on_each_cpu_mask(ipi_flush_tlb_page, &ta, 1, 1, mask); | |
753 | } | |
754 | ||
755 | void flush_tlb_kernel_page(unsigned long kaddr) | |
756 | { | |
757 | struct tlb_args ta; | |
758 | ||
759 | ta.ta_start = kaddr; | |
760 | ||
761 | on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1, 1); | |
762 | } | |
763 | ||
764 | void flush_tlb_range(struct vm_area_struct *vma, | |
765 | unsigned long start, unsigned long end) | |
766 | { | |
767 | cpumask_t mask = vma->vm_mm->cpu_vm_mask; | |
768 | struct tlb_args ta; | |
769 | ||
770 | ta.ta_vma = vma; | |
771 | ta.ta_start = start; | |
772 | ta.ta_end = end; | |
773 | ||
774 | on_each_cpu_mask(ipi_flush_tlb_range, &ta, 1, 1, mask); | |
775 | } | |
776 | ||
777 | void flush_tlb_kernel_range(unsigned long start, unsigned long end) | |
778 | { | |
779 | struct tlb_args ta; | |
780 | ||
781 | ta.ta_start = start; | |
782 | ta.ta_end = end; | |
783 | ||
784 | on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1, 1); | |
785 | } |