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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> | |
20 | #include <linux/cpu.h> | |
21 | #include <linux/smp.h> | |
22 | #include <linux/seq_file.h> | |
c97d4869 | 23 | #include <linux/irq.h> |
1da177e4 LT |
24 | |
25 | #include <asm/atomic.h> | |
26 | #include <asm/cacheflush.h> | |
27 | #include <asm/cpu.h> | |
e65f38ed RK |
28 | #include <asm/mmu_context.h> |
29 | #include <asm/pgtable.h> | |
30 | #include <asm/pgalloc.h> | |
1da177e4 LT |
31 | #include <asm/processor.h> |
32 | #include <asm/tlbflush.h> | |
33 | #include <asm/ptrace.h> | |
34 | ||
35 | /* | |
36 | * bitmask of present and online CPUs. | |
37 | * The present bitmask indicates that the CPU is physically present. | |
38 | * The online bitmask indicates that the CPU is up and running. | |
39 | */ | |
d12734d1 | 40 | cpumask_t cpu_possible_map; |
e16b38f7 | 41 | EXPORT_SYMBOL(cpu_possible_map); |
1da177e4 | 42 | cpumask_t cpu_online_map; |
e16b38f7 | 43 | EXPORT_SYMBOL(cpu_online_map); |
1da177e4 | 44 | |
e65f38ed RK |
45 | /* |
46 | * as from 2.5, kernels no longer have an init_tasks structure | |
47 | * so we need some other way of telling a new secondary core | |
48 | * where to place its SVC stack | |
49 | */ | |
50 | struct secondary_data secondary_data; | |
51 | ||
1da177e4 LT |
52 | /* |
53 | * structures for inter-processor calls | |
54 | * - A collection of single bit ipi messages. | |
55 | */ | |
56 | struct ipi_data { | |
57 | spinlock_t lock; | |
58 | unsigned long ipi_count; | |
59 | unsigned long bits; | |
60 | }; | |
61 | ||
62 | static DEFINE_PER_CPU(struct ipi_data, ipi_data) = { | |
63 | .lock = SPIN_LOCK_UNLOCKED, | |
64 | }; | |
65 | ||
66 | enum ipi_msg_type { | |
67 | IPI_TIMER, | |
68 | IPI_RESCHEDULE, | |
69 | IPI_CALL_FUNC, | |
70 | IPI_CPU_STOP, | |
71 | }; | |
72 | ||
73 | struct smp_call_struct { | |
74 | void (*func)(void *info); | |
75 | void *info; | |
76 | int wait; | |
77 | cpumask_t pending; | |
78 | cpumask_t unfinished; | |
79 | }; | |
80 | ||
81 | static struct smp_call_struct * volatile smp_call_function_data; | |
82 | static DEFINE_SPINLOCK(smp_call_function_lock); | |
83 | ||
bd6f68af | 84 | int __cpuinit __cpu_up(unsigned int cpu) |
1da177e4 | 85 | { |
71f512e8 RK |
86 | struct cpuinfo_arm *ci = &per_cpu(cpu_data, cpu); |
87 | struct task_struct *idle = ci->idle; | |
e65f38ed RK |
88 | pgd_t *pgd; |
89 | pmd_t *pmd; | |
1da177e4 LT |
90 | int ret; |
91 | ||
92 | /* | |
71f512e8 RK |
93 | * Spawn a new process manually, if not already done. |
94 | * Grab a pointer to its task struct so we can mess with it | |
1da177e4 | 95 | */ |
71f512e8 RK |
96 | if (!idle) { |
97 | idle = fork_idle(cpu); | |
98 | if (IS_ERR(idle)) { | |
99 | printk(KERN_ERR "CPU%u: fork() failed\n", cpu); | |
100 | return PTR_ERR(idle); | |
101 | } | |
102 | ci->idle = idle; | |
1da177e4 LT |
103 | } |
104 | ||
e65f38ed RK |
105 | /* |
106 | * Allocate initial page tables to allow the new CPU to | |
107 | * enable the MMU safely. This essentially means a set | |
108 | * of our "standard" page tables, with the addition of | |
109 | * a 1:1 mapping for the physical address of the kernel. | |
110 | */ | |
111 | pgd = pgd_alloc(&init_mm); | |
112 | pmd = pmd_offset(pgd, PHYS_OFFSET); | |
113 | *pmd = __pmd((PHYS_OFFSET & PGDIR_MASK) | | |
114 | PMD_TYPE_SECT | PMD_SECT_AP_WRITE); | |
115 | ||
116 | /* | |
117 | * We need to tell the secondary core where to find | |
118 | * its stack and the page tables. | |
119 | */ | |
32d39a93 | 120 | secondary_data.stack = task_stack_page(idle) + THREAD_START_SP; |
e65f38ed RK |
121 | secondary_data.pgdir = virt_to_phys(pgd); |
122 | wmb(); | |
123 | ||
1da177e4 LT |
124 | /* |
125 | * Now bring the CPU into our world. | |
126 | */ | |
127 | ret = boot_secondary(cpu, idle); | |
e65f38ed RK |
128 | if (ret == 0) { |
129 | unsigned long timeout; | |
130 | ||
131 | /* | |
132 | * CPU was successfully started, wait for it | |
133 | * to come online or time out. | |
134 | */ | |
135 | timeout = jiffies + HZ; | |
136 | while (time_before(jiffies, timeout)) { | |
137 | if (cpu_online(cpu)) | |
138 | break; | |
139 | ||
140 | udelay(10); | |
141 | barrier(); | |
142 | } | |
143 | ||
144 | if (!cpu_online(cpu)) | |
145 | ret = -EIO; | |
146 | } | |
147 | ||
5d43045b | 148 | secondary_data.stack = NULL; |
e65f38ed RK |
149 | secondary_data.pgdir = 0; |
150 | ||
151 | *pmd_offset(pgd, PHYS_OFFSET) = __pmd(0); | |
152 | pgd_free(pgd); | |
153 | ||
1da177e4 | 154 | if (ret) { |
0908db22 RK |
155 | printk(KERN_CRIT "CPU%u: processor failed to boot\n", cpu); |
156 | ||
1da177e4 LT |
157 | /* |
158 | * FIXME: We need to clean up the new idle thread. --rmk | |
159 | */ | |
160 | } | |
161 | ||
162 | return ret; | |
163 | } | |
164 | ||
a054a811 RK |
165 | #ifdef CONFIG_HOTPLUG_CPU |
166 | /* | |
167 | * __cpu_disable runs on the processor to be shutdown. | |
168 | */ | |
169 | int __cpuexit __cpu_disable(void) | |
170 | { | |
171 | unsigned int cpu = smp_processor_id(); | |
172 | struct task_struct *p; | |
173 | int ret; | |
174 | ||
175 | ret = mach_cpu_disable(cpu); | |
176 | if (ret) | |
177 | return ret; | |
178 | ||
179 | /* | |
180 | * Take this CPU offline. Once we clear this, we can't return, | |
181 | * and we must not schedule until we're ready to give up the cpu. | |
182 | */ | |
183 | cpu_clear(cpu, cpu_online_map); | |
184 | ||
185 | /* | |
186 | * OK - migrate IRQs away from this CPU | |
187 | */ | |
188 | migrate_irqs(); | |
189 | ||
37ee16ae RK |
190 | /* |
191 | * Stop the local timer for this CPU. | |
192 | */ | |
193 | local_timer_stop(cpu); | |
194 | ||
a054a811 RK |
195 | /* |
196 | * Flush user cache and TLB mappings, and then remove this CPU | |
197 | * from the vm mask set of all processes. | |
198 | */ | |
199 | flush_cache_all(); | |
200 | local_flush_tlb_all(); | |
201 | ||
202 | read_lock(&tasklist_lock); | |
203 | for_each_process(p) { | |
204 | if (p->mm) | |
205 | cpu_clear(cpu, p->mm->cpu_vm_mask); | |
206 | } | |
207 | read_unlock(&tasklist_lock); | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | /* | |
213 | * called on the thread which is asking for a CPU to be shutdown - | |
214 | * waits until shutdown has completed, or it is timed out. | |
215 | */ | |
216 | void __cpuexit __cpu_die(unsigned int cpu) | |
217 | { | |
218 | if (!platform_cpu_kill(cpu)) | |
219 | printk("CPU%u: unable to kill\n", cpu); | |
220 | } | |
221 | ||
222 | /* | |
223 | * Called from the idle thread for the CPU which has been shutdown. | |
224 | * | |
225 | * Note that we disable IRQs here, but do not re-enable them | |
226 | * before returning to the caller. This is also the behaviour | |
227 | * of the other hotplug-cpu capable cores, so presumably coming | |
228 | * out of idle fixes this. | |
229 | */ | |
230 | void __cpuexit cpu_die(void) | |
231 | { | |
232 | unsigned int cpu = smp_processor_id(); | |
233 | ||
234 | local_irq_disable(); | |
235 | idle_task_exit(); | |
236 | ||
237 | /* | |
238 | * actual CPU shutdown procedure is at least platform (if not | |
239 | * CPU) specific | |
240 | */ | |
241 | platform_cpu_die(cpu); | |
242 | ||
243 | /* | |
244 | * Do not return to the idle loop - jump back to the secondary | |
245 | * cpu initialisation. There's some initialisation which needs | |
246 | * to be repeated to undo the effects of taking the CPU offline. | |
247 | */ | |
248 | __asm__("mov sp, %0\n" | |
249 | " b secondary_start_kernel" | |
250 | : | |
32d39a93 | 251 | : "r" (task_stack_page(current) + THREAD_SIZE - 8)); |
a054a811 RK |
252 | } |
253 | #endif /* CONFIG_HOTPLUG_CPU */ | |
254 | ||
e65f38ed RK |
255 | /* |
256 | * This is the secondary CPU boot entry. We're using this CPUs | |
257 | * idle thread stack, but a set of temporary page tables. | |
258 | */ | |
bd6f68af | 259 | asmlinkage void __cpuinit secondary_start_kernel(void) |
e65f38ed RK |
260 | { |
261 | struct mm_struct *mm = &init_mm; | |
da2660d2 | 262 | unsigned int cpu = smp_processor_id(); |
e65f38ed RK |
263 | |
264 | printk("CPU%u: Booted secondary processor\n", cpu); | |
265 | ||
266 | /* | |
267 | * All kernel threads share the same mm context; grab a | |
268 | * reference and switch to it. | |
269 | */ | |
270 | atomic_inc(&mm->mm_users); | |
271 | atomic_inc(&mm->mm_count); | |
272 | current->active_mm = mm; | |
273 | cpu_set(cpu, mm->cpu_vm_mask); | |
274 | cpu_switch_mm(mm->pgd, mm); | |
275 | enter_lazy_tlb(mm, current); | |
505d7b19 | 276 | local_flush_tlb_all(); |
e65f38ed RK |
277 | |
278 | cpu_init(); | |
5bfb5d69 | 279 | preempt_disable(); |
e65f38ed RK |
280 | |
281 | /* | |
282 | * Give the platform a chance to do its own initialisation. | |
283 | */ | |
284 | platform_secondary_init(cpu); | |
285 | ||
286 | /* | |
287 | * Enable local interrupts. | |
288 | */ | |
289 | local_irq_enable(); | |
290 | local_fiq_enable(); | |
291 | ||
292 | calibrate_delay(); | |
293 | ||
294 | smp_store_cpu_info(cpu); | |
295 | ||
296 | /* | |
297 | * OK, now it's safe to let the boot CPU continue | |
298 | */ | |
299 | cpu_set(cpu, cpu_online_map); | |
300 | ||
37ee16ae RK |
301 | /* |
302 | * Setup local timer for this CPU. | |
303 | */ | |
304 | local_timer_setup(cpu); | |
305 | ||
e65f38ed RK |
306 | /* |
307 | * OK, it's off to the idle thread for us | |
308 | */ | |
309 | cpu_idle(); | |
310 | } | |
311 | ||
1da177e4 LT |
312 | /* |
313 | * Called by both boot and secondaries to move global data into | |
314 | * per-processor storage. | |
315 | */ | |
bd6f68af | 316 | void __cpuinit smp_store_cpu_info(unsigned int cpuid) |
1da177e4 LT |
317 | { |
318 | struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid); | |
319 | ||
320 | cpu_info->loops_per_jiffy = loops_per_jiffy; | |
321 | } | |
322 | ||
323 | void __init smp_cpus_done(unsigned int max_cpus) | |
324 | { | |
325 | int cpu; | |
326 | unsigned long bogosum = 0; | |
327 | ||
328 | for_each_online_cpu(cpu) | |
329 | bogosum += per_cpu(cpu_data, cpu).loops_per_jiffy; | |
330 | ||
331 | printk(KERN_INFO "SMP: Total of %d processors activated " | |
332 | "(%lu.%02lu BogoMIPS).\n", | |
333 | num_online_cpus(), | |
334 | bogosum / (500000/HZ), | |
335 | (bogosum / (5000/HZ)) % 100); | |
336 | } | |
337 | ||
338 | void __init smp_prepare_boot_cpu(void) | |
339 | { | |
340 | unsigned int cpu = smp_processor_id(); | |
341 | ||
71f512e8 | 342 | per_cpu(cpu_data, cpu).idle = current; |
1da177e4 LT |
343 | } |
344 | ||
345 | static void send_ipi_message(cpumask_t callmap, enum ipi_msg_type msg) | |
346 | { | |
347 | unsigned long flags; | |
348 | unsigned int cpu; | |
349 | ||
350 | local_irq_save(flags); | |
351 | ||
352 | for_each_cpu_mask(cpu, callmap) { | |
353 | struct ipi_data *ipi = &per_cpu(ipi_data, cpu); | |
354 | ||
355 | spin_lock(&ipi->lock); | |
356 | ipi->bits |= 1 << msg; | |
357 | spin_unlock(&ipi->lock); | |
358 | } | |
359 | ||
360 | /* | |
361 | * Call the platform specific cross-CPU call function. | |
362 | */ | |
363 | smp_cross_call(callmap); | |
364 | ||
365 | local_irq_restore(flags); | |
366 | } | |
367 | ||
368 | /* | |
369 | * You must not call this function with disabled interrupts, from a | |
370 | * hardware interrupt handler, nor from a bottom half handler. | |
371 | */ | |
5d43045b RK |
372 | static int smp_call_function_on_cpu(void (*func)(void *info), void *info, |
373 | int retry, int wait, cpumask_t callmap) | |
1da177e4 LT |
374 | { |
375 | struct smp_call_struct data; | |
376 | unsigned long timeout; | |
377 | int ret = 0; | |
378 | ||
379 | data.func = func; | |
380 | data.info = info; | |
381 | data.wait = wait; | |
382 | ||
383 | cpu_clear(smp_processor_id(), callmap); | |
384 | if (cpus_empty(callmap)) | |
385 | goto out; | |
386 | ||
387 | data.pending = callmap; | |
388 | if (wait) | |
389 | data.unfinished = callmap; | |
390 | ||
391 | /* | |
392 | * try to get the mutex on smp_call_function_data | |
393 | */ | |
394 | spin_lock(&smp_call_function_lock); | |
395 | smp_call_function_data = &data; | |
396 | ||
397 | send_ipi_message(callmap, IPI_CALL_FUNC); | |
398 | ||
399 | timeout = jiffies + HZ; | |
400 | while (!cpus_empty(data.pending) && time_before(jiffies, timeout)) | |
401 | barrier(); | |
402 | ||
403 | /* | |
404 | * did we time out? | |
405 | */ | |
406 | if (!cpus_empty(data.pending)) { | |
407 | /* | |
408 | * this may be causing our panic - report it | |
409 | */ | |
410 | printk(KERN_CRIT | |
411 | "CPU%u: smp_call_function timeout for %p(%p)\n" | |
412 | " callmap %lx pending %lx, %swait\n", | |
273c2cdb RK |
413 | smp_processor_id(), func, info, *cpus_addr(callmap), |
414 | *cpus_addr(data.pending), wait ? "" : "no "); | |
1da177e4 LT |
415 | |
416 | /* | |
417 | * TRACE | |
418 | */ | |
419 | timeout = jiffies + (5 * HZ); | |
420 | while (!cpus_empty(data.pending) && time_before(jiffies, timeout)) | |
421 | barrier(); | |
422 | ||
423 | if (cpus_empty(data.pending)) | |
424 | printk(KERN_CRIT " RESOLVED\n"); | |
425 | else | |
426 | printk(KERN_CRIT " STILL STUCK\n"); | |
427 | } | |
428 | ||
429 | /* | |
430 | * whatever happened, we're done with the data, so release it | |
431 | */ | |
432 | smp_call_function_data = NULL; | |
433 | spin_unlock(&smp_call_function_lock); | |
434 | ||
435 | if (!cpus_empty(data.pending)) { | |
436 | ret = -ETIMEDOUT; | |
437 | goto out; | |
438 | } | |
439 | ||
440 | if (wait) | |
441 | while (!cpus_empty(data.unfinished)) | |
442 | barrier(); | |
443 | out: | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
448 | int smp_call_function(void (*func)(void *info), void *info, int retry, | |
449 | int wait) | |
450 | { | |
451 | return smp_call_function_on_cpu(func, info, retry, wait, | |
452 | cpu_online_map); | |
453 | } | |
e730bf96 | 454 | EXPORT_SYMBOL_GPL(smp_call_function); |
1da177e4 LT |
455 | |
456 | void show_ipi_list(struct seq_file *p) | |
457 | { | |
458 | unsigned int cpu; | |
459 | ||
460 | seq_puts(p, "IPI:"); | |
461 | ||
e11b2236 | 462 | for_each_present_cpu(cpu) |
1da177e4 LT |
463 | seq_printf(p, " %10lu", per_cpu(ipi_data, cpu).ipi_count); |
464 | ||
465 | seq_putc(p, '\n'); | |
466 | } | |
467 | ||
37ee16ae RK |
468 | void show_local_irqs(struct seq_file *p) |
469 | { | |
470 | unsigned int cpu; | |
471 | ||
472 | seq_printf(p, "LOC: "); | |
473 | ||
474 | for_each_present_cpu(cpu) | |
475 | seq_printf(p, "%10u ", irq_stat[cpu].local_timer_irqs); | |
476 | ||
477 | seq_putc(p, '\n'); | |
478 | } | |
479 | ||
c97d4869 | 480 | static void ipi_timer(void) |
1da177e4 | 481 | { |
1da177e4 | 482 | irq_enter(); |
c97d4869 RK |
483 | profile_tick(CPU_PROFILING); |
484 | update_process_times(user_mode(get_irq_regs())); | |
1da177e4 LT |
485 | irq_exit(); |
486 | } | |
487 | ||
37ee16ae | 488 | #ifdef CONFIG_LOCAL_TIMERS |
b9811d7f | 489 | asmlinkage void __exception do_local_timer(struct pt_regs *regs) |
37ee16ae | 490 | { |
c97d4869 | 491 | struct pt_regs *old_regs = set_irq_regs(regs); |
37ee16ae RK |
492 | int cpu = smp_processor_id(); |
493 | ||
494 | if (local_timer_ack()) { | |
495 | irq_stat[cpu].local_timer_irqs++; | |
c97d4869 | 496 | ipi_timer(); |
37ee16ae | 497 | } |
c97d4869 RK |
498 | |
499 | set_irq_regs(old_regs); | |
37ee16ae RK |
500 | } |
501 | #endif | |
502 | ||
1da177e4 LT |
503 | /* |
504 | * ipi_call_function - handle IPI from smp_call_function() | |
505 | * | |
506 | * Note that we copy data out of the cross-call structure and then | |
507 | * let the caller know that we're here and have done with their data | |
508 | */ | |
509 | static void ipi_call_function(unsigned int cpu) | |
510 | { | |
511 | struct smp_call_struct *data = smp_call_function_data; | |
512 | void (*func)(void *info) = data->func; | |
513 | void *info = data->info; | |
514 | int wait = data->wait; | |
515 | ||
516 | cpu_clear(cpu, data->pending); | |
517 | ||
518 | func(info); | |
519 | ||
520 | if (wait) | |
521 | cpu_clear(cpu, data->unfinished); | |
522 | } | |
523 | ||
524 | static DEFINE_SPINLOCK(stop_lock); | |
525 | ||
526 | /* | |
527 | * ipi_cpu_stop - handle IPI from smp_send_stop() | |
528 | */ | |
529 | static void ipi_cpu_stop(unsigned int cpu) | |
530 | { | |
531 | spin_lock(&stop_lock); | |
532 | printk(KERN_CRIT "CPU%u: stopping\n", cpu); | |
533 | dump_stack(); | |
534 | spin_unlock(&stop_lock); | |
535 | ||
536 | cpu_clear(cpu, cpu_online_map); | |
537 | ||
538 | local_fiq_disable(); | |
539 | local_irq_disable(); | |
540 | ||
541 | while (1) | |
542 | cpu_relax(); | |
543 | } | |
544 | ||
545 | /* | |
546 | * Main handler for inter-processor interrupts | |
547 | * | |
548 | * For ARM, the ipimask now only identifies a single | |
549 | * category of IPI (Bit 1 IPIs have been replaced by a | |
550 | * different mechanism): | |
551 | * | |
552 | * Bit 0 - Inter-processor function call | |
553 | */ | |
b9811d7f | 554 | asmlinkage void __exception do_IPI(struct pt_regs *regs) |
1da177e4 LT |
555 | { |
556 | unsigned int cpu = smp_processor_id(); | |
557 | struct ipi_data *ipi = &per_cpu(ipi_data, cpu); | |
c97d4869 | 558 | struct pt_regs *old_regs = set_irq_regs(regs); |
1da177e4 LT |
559 | |
560 | ipi->ipi_count++; | |
561 | ||
562 | for (;;) { | |
563 | unsigned long msgs; | |
564 | ||
565 | spin_lock(&ipi->lock); | |
566 | msgs = ipi->bits; | |
567 | ipi->bits = 0; | |
568 | spin_unlock(&ipi->lock); | |
569 | ||
570 | if (!msgs) | |
571 | break; | |
572 | ||
573 | do { | |
574 | unsigned nextmsg; | |
575 | ||
576 | nextmsg = msgs & -msgs; | |
577 | msgs &= ~nextmsg; | |
578 | nextmsg = ffz(~nextmsg); | |
579 | ||
580 | switch (nextmsg) { | |
581 | case IPI_TIMER: | |
c97d4869 | 582 | ipi_timer(); |
1da177e4 LT |
583 | break; |
584 | ||
585 | case IPI_RESCHEDULE: | |
586 | /* | |
587 | * nothing more to do - eveything is | |
588 | * done on the interrupt return path | |
589 | */ | |
590 | break; | |
591 | ||
592 | case IPI_CALL_FUNC: | |
593 | ipi_call_function(cpu); | |
594 | break; | |
595 | ||
596 | case IPI_CPU_STOP: | |
597 | ipi_cpu_stop(cpu); | |
598 | break; | |
599 | ||
600 | default: | |
601 | printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%x\n", | |
602 | cpu, nextmsg); | |
603 | break; | |
604 | } | |
605 | } while (msgs); | |
606 | } | |
c97d4869 RK |
607 | |
608 | set_irq_regs(old_regs); | |
1da177e4 LT |
609 | } |
610 | ||
611 | void smp_send_reschedule(int cpu) | |
612 | { | |
613 | send_ipi_message(cpumask_of_cpu(cpu), IPI_RESCHEDULE); | |
614 | } | |
615 | ||
616 | void smp_send_timer(void) | |
617 | { | |
618 | cpumask_t mask = cpu_online_map; | |
619 | cpu_clear(smp_processor_id(), mask); | |
620 | send_ipi_message(mask, IPI_TIMER); | |
621 | } | |
622 | ||
623 | void smp_send_stop(void) | |
624 | { | |
625 | cpumask_t mask = cpu_online_map; | |
626 | cpu_clear(smp_processor_id(), mask); | |
627 | send_ipi_message(mask, IPI_CPU_STOP); | |
628 | } | |
629 | ||
630 | /* | |
631 | * not supported here | |
632 | */ | |
633 | int __init setup_profiling_timer(unsigned int multiplier) | |
634 | { | |
635 | return -EINVAL; | |
636 | } | |
4b0ef3b1 RK |
637 | |
638 | static int | |
639 | on_each_cpu_mask(void (*func)(void *), void *info, int retry, int wait, | |
640 | cpumask_t mask) | |
641 | { | |
642 | int ret = 0; | |
643 | ||
644 | preempt_disable(); | |
645 | ||
646 | ret = smp_call_function_on_cpu(func, info, retry, wait, mask); | |
647 | if (cpu_isset(smp_processor_id(), mask)) | |
648 | func(info); | |
649 | ||
650 | preempt_enable(); | |
651 | ||
652 | return ret; | |
653 | } | |
654 | ||
655 | /**********************************************************************/ | |
656 | ||
657 | /* | |
658 | * TLB operations | |
659 | */ | |
660 | struct tlb_args { | |
661 | struct vm_area_struct *ta_vma; | |
662 | unsigned long ta_start; | |
663 | unsigned long ta_end; | |
664 | }; | |
665 | ||
666 | static inline void ipi_flush_tlb_all(void *ignored) | |
667 | { | |
668 | local_flush_tlb_all(); | |
669 | } | |
670 | ||
671 | static inline void ipi_flush_tlb_mm(void *arg) | |
672 | { | |
673 | struct mm_struct *mm = (struct mm_struct *)arg; | |
674 | ||
675 | local_flush_tlb_mm(mm); | |
676 | } | |
677 | ||
678 | static inline void ipi_flush_tlb_page(void *arg) | |
679 | { | |
680 | struct tlb_args *ta = (struct tlb_args *)arg; | |
681 | ||
682 | local_flush_tlb_page(ta->ta_vma, ta->ta_start); | |
683 | } | |
684 | ||
685 | static inline void ipi_flush_tlb_kernel_page(void *arg) | |
686 | { | |
687 | struct tlb_args *ta = (struct tlb_args *)arg; | |
688 | ||
689 | local_flush_tlb_kernel_page(ta->ta_start); | |
690 | } | |
691 | ||
692 | static inline void ipi_flush_tlb_range(void *arg) | |
693 | { | |
694 | struct tlb_args *ta = (struct tlb_args *)arg; | |
695 | ||
696 | local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end); | |
697 | } | |
698 | ||
699 | static inline void ipi_flush_tlb_kernel_range(void *arg) | |
700 | { | |
701 | struct tlb_args *ta = (struct tlb_args *)arg; | |
702 | ||
703 | local_flush_tlb_kernel_range(ta->ta_start, ta->ta_end); | |
704 | } | |
705 | ||
706 | void flush_tlb_all(void) | |
707 | { | |
708 | on_each_cpu(ipi_flush_tlb_all, NULL, 1, 1); | |
709 | } | |
710 | ||
711 | void flush_tlb_mm(struct mm_struct *mm) | |
712 | { | |
713 | cpumask_t mask = mm->cpu_vm_mask; | |
714 | ||
715 | on_each_cpu_mask(ipi_flush_tlb_mm, mm, 1, 1, mask); | |
716 | } | |
717 | ||
718 | void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr) | |
719 | { | |
720 | cpumask_t mask = vma->vm_mm->cpu_vm_mask; | |
721 | struct tlb_args ta; | |
722 | ||
723 | ta.ta_vma = vma; | |
724 | ta.ta_start = uaddr; | |
725 | ||
726 | on_each_cpu_mask(ipi_flush_tlb_page, &ta, 1, 1, mask); | |
727 | } | |
728 | ||
729 | void flush_tlb_kernel_page(unsigned long kaddr) | |
730 | { | |
731 | struct tlb_args ta; | |
732 | ||
733 | ta.ta_start = kaddr; | |
734 | ||
735 | on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1, 1); | |
736 | } | |
737 | ||
738 | void flush_tlb_range(struct vm_area_struct *vma, | |
739 | unsigned long start, unsigned long end) | |
740 | { | |
741 | cpumask_t mask = vma->vm_mm->cpu_vm_mask; | |
742 | struct tlb_args ta; | |
743 | ||
744 | ta.ta_vma = vma; | |
745 | ta.ta_start = start; | |
746 | ta.ta_end = end; | |
747 | ||
748 | on_each_cpu_mask(ipi_flush_tlb_range, &ta, 1, 1, mask); | |
749 | } | |
750 | ||
751 | void flush_tlb_kernel_range(unsigned long start, unsigned long end) | |
752 | { | |
753 | struct tlb_args ta; | |
754 | ||
755 | ta.ta_start = start; | |
756 | ta.ta_end = end; | |
757 | ||
758 | on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1, 1); | |
759 | } |