blob: 1a1c5e2b3ef9372bf5d72a6c244d285c99843cda [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Russell Kingc97d4862006-10-25 13:59:16 +010010#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#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>
Alexey Dobriyan4e950f62007-07-30 02:36:13 +040020#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/cpu.h>
22#include <linux/smp.h>
23#include <linux/seq_file.h>
Russell Kingc97d4862006-10-25 13:59:16 +010024#include <linux/irq.h>
Russell Kingbc282482009-05-17 18:58:34 +010025#include <linux/percpu.h>
26#include <linux/clockchips.h>
Russell King3c030be2010-11-30 11:07:35 +000027#include <linux/completion.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29#include <asm/atomic.h>
30#include <asm/cacheflush.h>
31#include <asm/cpu.h>
Russell King42578c82009-06-11 15:35:00 +010032#include <asm/cputype.h>
Russell Kinge65f38e2005-06-18 09:33:31 +010033#include <asm/mmu_context.h>
34#include <asm/pgtable.h>
35#include <asm/pgalloc.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <asm/processor.h>
Russell King37b05b62010-10-01 15:38:24 +010037#include <asm/sections.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <asm/tlbflush.h>
39#include <asm/ptrace.h>
Russell Kingbc282482009-05-17 18:58:34 +010040#include <asm/localtimer.h>
Russell Kinge616c592009-09-27 20:55:43 +010041#include <asm/smp_plat.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
43/*
Russell Kinge65f38e2005-06-18 09:33:31 +010044 * as from 2.5, kernels no longer have an init_tasks structure
45 * so we need some other way of telling a new secondary core
46 * where to place its SVC stack
47 */
48struct secondary_data secondary_data;
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050enum ipi_msg_type {
Russell King24480d92010-11-15 09:54:18 +000051 IPI_TIMER = 2,
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 IPI_RESCHEDULE,
53 IPI_CALL_FUNC,
Jens Axboef6dd9fa2008-06-10 20:48:30 +020054 IPI_CALL_FUNC_SINGLE,
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 IPI_CPU_STOP,
56};
57
Russell King37b05b62010-10-01 15:38:24 +010058static inline void identity_mapping_add(pgd_t *pgd, unsigned long start,
59 unsigned long end)
60{
61 unsigned long addr, prot;
62 pmd_t *pmd;
63
64 prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE;
65 if (cpu_architecture() <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale())
66 prot |= PMD_BIT4;
67
68 for (addr = start & PGDIR_MASK; addr < end;) {
69 pmd = pmd_offset(pgd + pgd_index(addr), addr);
70 pmd[0] = __pmd(addr | prot);
71 addr += SECTION_SIZE;
72 pmd[1] = __pmd(addr | prot);
73 addr += SECTION_SIZE;
74 flush_pmd_entry(pmd);
75 outer_clean_range(__pa(pmd), __pa(pmd + 1));
76 }
77}
78
79static inline void identity_mapping_del(pgd_t *pgd, unsigned long start,
80 unsigned long end)
81{
82 unsigned long addr;
83 pmd_t *pmd;
84
85 for (addr = start & PGDIR_MASK; addr < end; addr += PGDIR_SIZE) {
86 pmd = pmd_offset(pgd + pgd_index(addr), addr);
87 pmd[0] = __pmd(0);
88 pmd[1] = __pmd(0);
89 clean_pmd_entry(pmd);
90 outer_clean_range(__pa(pmd), __pa(pmd + 1));
91 }
92}
93
Russell Kingbd6f68a2005-07-17 21:35:41 +010094int __cpuinit __cpu_up(unsigned int cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095{
Russell King71f512e82005-11-02 21:51:40 +000096 struct cpuinfo_arm *ci = &per_cpu(cpu_data, cpu);
97 struct task_struct *idle = ci->idle;
Russell Kinge65f38e2005-06-18 09:33:31 +010098 pgd_t *pgd;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 int ret;
100
101 /*
Russell King71f512e82005-11-02 21:51:40 +0000102 * Spawn a new process manually, if not already done.
103 * Grab a pointer to its task struct so we can mess with it
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 */
Russell King71f512e82005-11-02 21:51:40 +0000105 if (!idle) {
106 idle = fork_idle(cpu);
107 if (IS_ERR(idle)) {
108 printk(KERN_ERR "CPU%u: fork() failed\n", cpu);
109 return PTR_ERR(idle);
110 }
111 ci->idle = idle;
Santosh Shilimkar13ea9cc2010-04-30 06:51:20 +0100112 } else {
113 /*
114 * Since this idle thread is being re-used, call
115 * init_idle() to reinitialize the thread structure.
116 */
117 init_idle(idle, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 }
119
120 /*
Russell Kinge65f38e2005-06-18 09:33:31 +0100121 * Allocate initial page tables to allow the new CPU to
122 * enable the MMU safely. This essentially means a set
123 * of our "standard" page tables, with the addition of
124 * a 1:1 mapping for the physical address of the kernel.
125 */
126 pgd = pgd_alloc(&init_mm);
Russell King37b05b62010-10-01 15:38:24 +0100127 if (!pgd)
128 return -ENOMEM;
129
130 if (PHYS_OFFSET != PAGE_OFFSET) {
131#ifndef CONFIG_HOTPLUG_CPU
132 identity_mapping_add(pgd, __pa(__init_begin), __pa(__init_end));
133#endif
134 identity_mapping_add(pgd, __pa(_stext), __pa(_etext));
135 identity_mapping_add(pgd, __pa(_sdata), __pa(_edata));
136 }
Russell Kinge65f38e2005-06-18 09:33:31 +0100137
138 /*
139 * We need to tell the secondary core where to find
140 * its stack and the page tables.
141 */
Al Viro32d39a92006-01-12 01:05:58 -0800142 secondary_data.stack = task_stack_page(idle) + THREAD_START_SP;
Russell Kinge65f38e2005-06-18 09:33:31 +0100143 secondary_data.pgdir = virt_to_phys(pgd);
Russell King10272472010-02-12 14:36:24 +0000144 __cpuc_flush_dcache_area(&secondary_data, sizeof(secondary_data));
145 outer_clean_range(__pa(&secondary_data), __pa(&secondary_data + 1));
Russell Kinge65f38e2005-06-18 09:33:31 +0100146
147 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 * Now bring the CPU into our world.
149 */
150 ret = boot_secondary(cpu, idle);
Russell Kinge65f38e2005-06-18 09:33:31 +0100151 if (ret == 0) {
152 unsigned long timeout;
153
154 /*
155 * CPU was successfully started, wait for it
156 * to come online or time out.
157 */
158 timeout = jiffies + HZ;
159 while (time_before(jiffies, timeout)) {
160 if (cpu_online(cpu))
161 break;
162
163 udelay(10);
164 barrier();
165 }
166
167 if (!cpu_online(cpu))
168 ret = -EIO;
169 }
170
Russell King5d430452005-11-08 10:44:46 +0000171 secondary_data.stack = NULL;
Russell Kinge65f38e2005-06-18 09:33:31 +0100172 secondary_data.pgdir = 0;
173
Russell King37b05b62010-10-01 15:38:24 +0100174 if (PHYS_OFFSET != PAGE_OFFSET) {
175#ifndef CONFIG_HOTPLUG_CPU
176 identity_mapping_del(pgd, __pa(__init_begin), __pa(__init_end));
177#endif
178 identity_mapping_del(pgd, __pa(_stext), __pa(_etext));
179 identity_mapping_del(pgd, __pa(_sdata), __pa(_edata));
180 }
181
Benjamin Herrenschmidt5e541972008-02-04 22:29:14 -0800182 pgd_free(&init_mm, pgd);
Russell Kinge65f38e2005-06-18 09:33:31 +0100183
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 if (ret) {
Russell King0908db22005-06-19 19:48:16 +0100185 printk(KERN_CRIT "CPU%u: processor failed to boot\n", cpu);
186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 /*
188 * FIXME: We need to clean up the new idle thread. --rmk
189 */
190 }
191
192 return ret;
193}
194
Russell Kinga054a812005-11-02 22:24:33 +0000195#ifdef CONFIG_HOTPLUG_CPU
196/*
197 * __cpu_disable runs on the processor to be shutdown.
198 */
Russell King90140c32009-09-27 21:04:48 +0100199int __cpu_disable(void)
Russell Kinga054a812005-11-02 22:24:33 +0000200{
201 unsigned int cpu = smp_processor_id();
202 struct task_struct *p;
203 int ret;
204
Russell King8e2a43f2010-05-15 10:18:05 +0100205 ret = platform_cpu_disable(cpu);
Russell Kinga054a812005-11-02 22:24:33 +0000206 if (ret)
207 return ret;
208
209 /*
210 * Take this CPU offline. Once we clear this, we can't return,
211 * and we must not schedule until we're ready to give up the cpu.
212 */
Russell Kinge03cdad2009-05-28 14:16:52 +0100213 set_cpu_online(cpu, false);
Russell Kinga054a812005-11-02 22:24:33 +0000214
215 /*
216 * OK - migrate IRQs away from this CPU
217 */
218 migrate_irqs();
219
220 /*
Russell King37ee16a2005-11-08 19:08:05 +0000221 * Stop the local timer for this CPU.
222 */
Catalin Marinasebac6542008-12-01 14:54:57 +0000223 local_timer_stop();
Russell King37ee16a2005-11-08 19:08:05 +0000224
225 /*
Russell Kinga054a812005-11-02 22:24:33 +0000226 * Flush user cache and TLB mappings, and then remove this CPU
227 * from the vm mask set of all processes.
228 */
229 flush_cache_all();
230 local_flush_tlb_all();
231
232 read_lock(&tasklist_lock);
233 for_each_process(p) {
234 if (p->mm)
Rusty Russell56f8ba82009-09-24 09:34:49 -0600235 cpumask_clear_cpu(cpu, mm_cpumask(p->mm));
Russell Kinga054a812005-11-02 22:24:33 +0000236 }
237 read_unlock(&tasklist_lock);
238
239 return 0;
240}
241
Russell King3c030be2010-11-30 11:07:35 +0000242static DECLARE_COMPLETION(cpu_died);
243
Russell Kinga054a812005-11-02 22:24:33 +0000244/*
245 * called on the thread which is asking for a CPU to be shutdown -
246 * waits until shutdown has completed, or it is timed out.
247 */
Russell King90140c32009-09-27 21:04:48 +0100248void __cpu_die(unsigned int cpu)
Russell Kinga054a812005-11-02 22:24:33 +0000249{
Russell King3c030be2010-11-30 11:07:35 +0000250 if (!wait_for_completion_timeout(&cpu_died, msecs_to_jiffies(5000))) {
251 pr_err("CPU%u: cpu didn't die\n", cpu);
252 return;
253 }
254 printk(KERN_NOTICE "CPU%u: shutdown\n", cpu);
255
Russell Kinga054a812005-11-02 22:24:33 +0000256 if (!platform_cpu_kill(cpu))
257 printk("CPU%u: unable to kill\n", cpu);
258}
259
260/*
261 * Called from the idle thread for the CPU which has been shutdown.
262 *
263 * Note that we disable IRQs here, but do not re-enable them
264 * before returning to the caller. This is also the behaviour
265 * of the other hotplug-cpu capable cores, so presumably coming
266 * out of idle fixes this.
267 */
Russell King90140c32009-09-27 21:04:48 +0100268void __ref cpu_die(void)
Russell Kinga054a812005-11-02 22:24:33 +0000269{
270 unsigned int cpu = smp_processor_id();
271
Russell Kinga054a812005-11-02 22:24:33 +0000272 idle_task_exit();
273
Russell Kingf36d3402010-11-30 12:21:30 +0000274 local_irq_disable();
275 mb();
276
Russell King3c030be2010-11-30 11:07:35 +0000277 /* Tell __cpu_die() that this CPU is now safe to dispose of */
278 complete(&cpu_died);
279
Russell Kinga054a812005-11-02 22:24:33 +0000280 /*
281 * actual CPU shutdown procedure is at least platform (if not
Russell King3c030be2010-11-30 11:07:35 +0000282 * CPU) specific.
Russell Kinga054a812005-11-02 22:24:33 +0000283 */
284 platform_cpu_die(cpu);
285
286 /*
287 * Do not return to the idle loop - jump back to the secondary
288 * cpu initialisation. There's some initialisation which needs
289 * to be repeated to undo the effects of taking the CPU offline.
290 */
291 __asm__("mov sp, %0\n"
292 " b secondary_start_kernel"
293 :
Al Viro32d39a92006-01-12 01:05:58 -0800294 : "r" (task_stack_page(current) + THREAD_SIZE - 8));
Russell Kinga054a812005-11-02 22:24:33 +0000295}
296#endif /* CONFIG_HOTPLUG_CPU */
297
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298/*
Russell King05c74a62010-12-03 11:09:48 +0000299 * Called by both boot and secondaries to move global data into
300 * per-processor storage.
301 */
302static void __cpuinit smp_store_cpu_info(unsigned int cpuid)
303{
304 struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid);
305
306 cpu_info->loops_per_jiffy = loops_per_jiffy;
307}
308
309/*
Russell Kinge65f38e2005-06-18 09:33:31 +0100310 * This is the secondary CPU boot entry. We're using this CPUs
311 * idle thread stack, but a set of temporary page tables.
312 */
Russell Kingbd6f68a2005-07-17 21:35:41 +0100313asmlinkage void __cpuinit secondary_start_kernel(void)
Russell Kinge65f38e2005-06-18 09:33:31 +0100314{
315 struct mm_struct *mm = &init_mm;
Russell Kingda2660d2005-11-12 17:21:47 +0000316 unsigned int cpu = smp_processor_id();
Russell Kinge65f38e2005-06-18 09:33:31 +0100317
318 printk("CPU%u: Booted secondary processor\n", cpu);
319
320 /*
321 * All kernel threads share the same mm context; grab a
322 * reference and switch to it.
323 */
324 atomic_inc(&mm->mm_users);
325 atomic_inc(&mm->mm_count);
326 current->active_mm = mm;
Rusty Russell56f8ba82009-09-24 09:34:49 -0600327 cpumask_set_cpu(cpu, mm_cpumask(mm));
Russell Kinge65f38e2005-06-18 09:33:31 +0100328 cpu_switch_mm(mm->pgd, mm);
329 enter_lazy_tlb(mm, current);
Russell King505d7b12005-07-28 20:32:47 +0100330 local_flush_tlb_all();
Russell Kinge65f38e2005-06-18 09:33:31 +0100331
332 cpu_init();
Nick Piggin5bfb5d62005-11-08 21:39:01 -0800333 preempt_disable();
Russell King2c0136d2010-12-03 15:00:49 +0000334 trace_hardirqs_off();
Russell Kinge65f38e2005-06-18 09:33:31 +0100335
336 /*
337 * Give the platform a chance to do its own initialisation.
338 */
339 platform_secondary_init(cpu);
340
341 /*
342 * Enable local interrupts.
343 */
Manfred Spraule545a612008-09-07 16:57:22 +0200344 notify_cpu_starting(cpu);
Russell Kinge65f38e2005-06-18 09:33:31 +0100345 local_irq_enable();
346 local_fiq_enable();
347
Catalin Marinasa8655e82008-02-04 17:30:57 +0100348 /*
Russell Kingbc282482009-05-17 18:58:34 +0100349 * Setup the percpu timer for this CPU.
Catalin Marinasa8655e82008-02-04 17:30:57 +0100350 */
Russell Kingbc282482009-05-17 18:58:34 +0100351 percpu_timer_setup();
Catalin Marinasa8655e82008-02-04 17:30:57 +0100352
Russell Kinge65f38e2005-06-18 09:33:31 +0100353 calibrate_delay();
354
355 smp_store_cpu_info(cpu);
356
357 /*
358 * OK, now it's safe to let the boot CPU continue
359 */
Russell Kinge03cdad2009-05-28 14:16:52 +0100360 set_cpu_online(cpu, true);
Russell Kinge65f38e2005-06-18 09:33:31 +0100361
362 /*
363 * OK, it's off to the idle thread for us
364 */
365 cpu_idle();
366}
367
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368void __init smp_cpus_done(unsigned int max_cpus)
369{
370 int cpu;
371 unsigned long bogosum = 0;
372
373 for_each_online_cpu(cpu)
374 bogosum += per_cpu(cpu_data, cpu).loops_per_jiffy;
375
376 printk(KERN_INFO "SMP: Total of %d processors activated "
377 "(%lu.%02lu BogoMIPS).\n",
378 num_online_cpus(),
379 bogosum / (500000/HZ),
380 (bogosum / (5000/HZ)) % 100);
381}
382
383void __init smp_prepare_boot_cpu(void)
384{
385 unsigned int cpu = smp_processor_id();
386
Russell King71f512e82005-11-02 21:51:40 +0000387 per_cpu(cpu_data, cpu).idle = current;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388}
389
Russell King05c74a62010-12-03 11:09:48 +0000390void __init smp_prepare_cpus(unsigned int max_cpus)
391{
392 unsigned int ncores = num_possible_cpus();
393
394 smp_store_cpu_info(smp_processor_id());
395
396 /*
397 * are we trying to boot more cores than exist?
398 */
399 if (max_cpus > ncores)
400 max_cpus = ncores;
401
402 if (max_cpus > 1) {
403 /*
404 * Enable the local timer or broadcast device for the
405 * boot CPU, but only if we have more than one CPU.
406 */
407 percpu_timer_setup();
408
409 /*
410 * Initialise the SCU if there are more than one CPU
411 * and let them know where to start.
412 */
413 platform_smp_prepare_cpus(max_cpus);
414 }
415}
416
Russell King82668102009-05-17 16:20:18 +0100417void arch_send_call_function_ipi_mask(const struct cpumask *mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418{
Russell Kinge3fbb082010-12-20 14:47:19 +0000419 smp_cross_call(mask, IPI_CALL_FUNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420}
421
Jens Axboef6dd9fa2008-06-10 20:48:30 +0200422void arch_send_call_function_single_ipi(int cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423{
Russell Kinge3fbb082010-12-20 14:47:19 +0000424 smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425}
Catalin Marinas3e459992008-02-04 17:28:56 +0100426
Russell King4a88abd2010-11-15 14:40:29 +0000427static const char *ipi_types[NR_IPI] = {
428#define S(x,s) [x - IPI_TIMER] = s
429 S(IPI_TIMER, "Timer broadcast interrupts"),
430 S(IPI_RESCHEDULE, "Rescheduling interrupts"),
431 S(IPI_CALL_FUNC, "Function call interrupts"),
432 S(IPI_CALL_FUNC_SINGLE, "Single function call interrupts"),
433 S(IPI_CPU_STOP, "CPU stop interrupts"),
434};
435
Russell Kingf13cd412010-11-15 14:33:51 +0000436void show_ipi_list(struct seq_file *p, int prec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437{
Russell King4a88abd2010-11-15 14:40:29 +0000438 unsigned int cpu, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
Russell King4a88abd2010-11-15 14:40:29 +0000440 for (i = 0; i < NR_IPI; i++) {
441 seq_printf(p, "%*s%u: ", prec - 1, "IPI", i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
Russell King4a88abd2010-11-15 14:40:29 +0000443 for_each_present_cpu(cpu)
444 seq_printf(p, "%10u ",
445 __get_irq_stat(cpu, ipi_irqs[i]));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
Russell King4a88abd2010-11-15 14:40:29 +0000447 seq_printf(p, " %s\n", ipi_types[i]);
448 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449}
450
Russell Kingb54992f2010-11-15 14:46:46 +0000451u64 smp_irq_stat_cpu(unsigned int cpu)
452{
453 u64 sum = 0;
454 int i;
455
456 for (i = 0; i < NR_IPI; i++)
457 sum += __get_irq_stat(cpu, ipi_irqs[i]);
458
459#ifdef CONFIG_LOCAL_TIMERS
460 sum += __get_irq_stat(cpu, local_timer_irqs);
461#endif
462
463 return sum;
464}
465
Russell Kingbc282482009-05-17 18:58:34 +0100466/*
467 * Timer (local or broadcast) support
468 */
469static DEFINE_PER_CPU(struct clock_event_device, percpu_clockevent);
470
Russell Kingc97d4862006-10-25 13:59:16 +0100471static void ipi_timer(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472{
Russell Kingbc282482009-05-17 18:58:34 +0100473 struct clock_event_device *evt = &__get_cpu_var(percpu_clockevent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 irq_enter();
Russell Kingbc282482009-05-17 18:58:34 +0100475 evt->event_handler(evt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 irq_exit();
477}
478
Russell King37ee16a2005-11-08 19:08:05 +0000479#ifdef CONFIG_LOCAL_TIMERS
Russell Kingb9811d72007-05-08 11:31:07 +0100480asmlinkage void __exception do_local_timer(struct pt_regs *regs)
Russell King37ee16a2005-11-08 19:08:05 +0000481{
Russell Kingc97d4862006-10-25 13:59:16 +0100482 struct pt_regs *old_regs = set_irq_regs(regs);
Russell King37ee16a2005-11-08 19:08:05 +0000483 int cpu = smp_processor_id();
484
485 if (local_timer_ack()) {
Russell King46c48f22010-11-15 14:15:03 +0000486 __inc_irq_stat(cpu, local_timer_irqs);
Russell Kingc97d4862006-10-25 13:59:16 +0100487 ipi_timer();
Russell King37ee16a2005-11-08 19:08:05 +0000488 }
Russell Kingc97d4862006-10-25 13:59:16 +0100489
490 set_irq_regs(old_regs);
Russell King37ee16a2005-11-08 19:08:05 +0000491}
Russell Kingec405ea2010-11-15 13:38:06 +0000492
Russell Kingf13cd412010-11-15 14:33:51 +0000493void show_local_irqs(struct seq_file *p, int prec)
Russell Kingec405ea2010-11-15 13:38:06 +0000494{
495 unsigned int cpu;
496
Russell Kingf13cd412010-11-15 14:33:51 +0000497 seq_printf(p, "%*s: ", prec, "LOC");
Russell Kingec405ea2010-11-15 13:38:06 +0000498
499 for_each_present_cpu(cpu)
Russell King46c48f22010-11-15 14:15:03 +0000500 seq_printf(p, "%10u ", __get_irq_stat(cpu, local_timer_irqs));
Russell Kingec405ea2010-11-15 13:38:06 +0000501
Russell Kingf13cd412010-11-15 14:33:51 +0000502 seq_printf(p, " Local timer interrupts\n");
Russell Kingec405ea2010-11-15 13:38:06 +0000503}
Russell King37ee16a2005-11-08 19:08:05 +0000504#endif
505
Russell Kingbc282482009-05-17 18:58:34 +0100506#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
507static void smp_timer_broadcast(const struct cpumask *mask)
508{
Russell Kinge3fbb082010-12-20 14:47:19 +0000509 smp_cross_call(mask, IPI_TIMER);
Russell Kingbc282482009-05-17 18:58:34 +0100510}
Russell King5388a6b2010-07-26 13:19:43 +0100511#else
512#define smp_timer_broadcast NULL
513#endif
Russell Kingbc282482009-05-17 18:58:34 +0100514
Russell King5388a6b2010-07-26 13:19:43 +0100515#ifndef CONFIG_LOCAL_TIMERS
Russell Kingbc282482009-05-17 18:58:34 +0100516static void broadcast_timer_set_mode(enum clock_event_mode mode,
517 struct clock_event_device *evt)
518{
519}
520
521static void local_timer_setup(struct clock_event_device *evt)
522{
523 evt->name = "dummy_timer";
524 evt->features = CLOCK_EVT_FEAT_ONESHOT |
525 CLOCK_EVT_FEAT_PERIODIC |
526 CLOCK_EVT_FEAT_DUMMY;
527 evt->rating = 400;
528 evt->mult = 1;
529 evt->set_mode = broadcast_timer_set_mode;
Russell Kingbc282482009-05-17 18:58:34 +0100530
531 clockevents_register_device(evt);
532}
533#endif
534
535void __cpuinit percpu_timer_setup(void)
536{
537 unsigned int cpu = smp_processor_id();
538 struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu);
539
540 evt->cpumask = cpumask_of(cpu);
Russell King5388a6b2010-07-26 13:19:43 +0100541 evt->broadcast = smp_timer_broadcast;
Russell Kingbc282482009-05-17 18:58:34 +0100542
543 local_timer_setup(evt);
544}
545
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546static DEFINE_SPINLOCK(stop_lock);
547
548/*
549 * ipi_cpu_stop - handle IPI from smp_send_stop()
550 */
551static void ipi_cpu_stop(unsigned int cpu)
552{
Russell King3d3f78d2010-07-26 13:31:27 +0100553 if (system_state == SYSTEM_BOOTING ||
554 system_state == SYSTEM_RUNNING) {
555 spin_lock(&stop_lock);
556 printk(KERN_CRIT "CPU%u: stopping\n", cpu);
557 dump_stack();
558 spin_unlock(&stop_lock);
559 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
Russell Kinge03cdad2009-05-28 14:16:52 +0100561 set_cpu_online(cpu, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562
563 local_fiq_disable();
564 local_irq_disable();
565
566 while (1)
567 cpu_relax();
568}
569
570/*
571 * Main handler for inter-processor interrupts
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 */
Russell Kingad3b6992010-11-15 09:42:08 +0000573asmlinkage void __exception do_IPI(int ipinr, struct pt_regs *regs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574{
575 unsigned int cpu = smp_processor_id();
Russell Kingc97d4862006-10-25 13:59:16 +0100576 struct pt_regs *old_regs = set_irq_regs(regs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
Russell King4a88abd2010-11-15 14:40:29 +0000578 if (ipinr >= IPI_TIMER && ipinr < IPI_TIMER + NR_IPI)
579 __inc_irq_stat(cpu, ipi_irqs[ipinr - IPI_TIMER]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
Russell King24480d92010-11-15 09:54:18 +0000581 switch (ipinr) {
582 case IPI_TIMER:
583 ipi_timer();
584 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
Russell King24480d92010-11-15 09:54:18 +0000586 case IPI_RESCHEDULE:
587 /*
588 * nothing more to do - eveything is
589 * done on the interrupt return path
590 */
591 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
Russell King24480d92010-11-15 09:54:18 +0000593 case IPI_CALL_FUNC:
594 generic_smp_call_function_interrupt();
595 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
Russell King24480d92010-11-15 09:54:18 +0000597 case IPI_CALL_FUNC_SINGLE:
598 generic_smp_call_function_single_interrupt();
599 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600
Russell King24480d92010-11-15 09:54:18 +0000601 case IPI_CPU_STOP:
602 ipi_cpu_stop(cpu);
603 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604
Russell King24480d92010-11-15 09:54:18 +0000605 default:
606 printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%x\n",
607 cpu, ipinr);
608 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 }
Russell Kingc97d4862006-10-25 13:59:16 +0100610 set_irq_regs(old_regs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611}
612
613void smp_send_reschedule(int cpu)
614{
Russell Kinge3fbb082010-12-20 14:47:19 +0000615 smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616}
617
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618void smp_send_stop(void)
619{
Russell King28e18292010-12-02 09:53:54 +0000620 unsigned long timeout;
621
622 if (num_online_cpus() > 1) {
623 cpumask_t mask = cpu_online_map;
624 cpu_clear(smp_processor_id(), mask);
625
Russell Kinge3fbb082010-12-20 14:47:19 +0000626 smp_cross_call(&mask, IPI_CPU_STOP);
Russell King28e18292010-12-02 09:53:54 +0000627 }
628
629 /* Wait up to one second for other CPUs to stop */
630 timeout = USEC_PER_SEC;
631 while (num_online_cpus() > 1 && timeout--)
632 udelay(1);
633
634 if (num_online_cpus() > 1)
635 pr_warning("SMP: failed to stop secondary CPUs\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636}
637
638/*
639 * not supported here
640 */
Russell King5048bcb2007-07-23 12:59:46 +0100641int setup_profiling_timer(unsigned int multiplier)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642{
643 return -EINVAL;
644}
Russell King4b0ef3b2005-06-28 13:49:16 +0100645
Russell King82668102009-05-17 16:20:18 +0100646static void
647on_each_cpu_mask(void (*func)(void *), void *info, int wait,
648 const struct cpumask *mask)
Russell King4b0ef3b2005-06-28 13:49:16 +0100649{
Russell King4b0ef3b2005-06-28 13:49:16 +0100650 preempt_disable();
651
Russell King82668102009-05-17 16:20:18 +0100652 smp_call_function_many(mask, func, info, wait);
653 if (cpumask_test_cpu(smp_processor_id(), mask))
Russell King4b0ef3b2005-06-28 13:49:16 +0100654 func(info);
655
656 preempt_enable();
Russell King4b0ef3b2005-06-28 13:49:16 +0100657}
658
659/**********************************************************************/
660
661/*
662 * TLB operations
663 */
664struct tlb_args {
665 struct vm_area_struct *ta_vma;
666 unsigned long ta_start;
667 unsigned long ta_end;
668};
669
670static inline void ipi_flush_tlb_all(void *ignored)
671{
672 local_flush_tlb_all();
673}
674
675static inline void ipi_flush_tlb_mm(void *arg)
676{
677 struct mm_struct *mm = (struct mm_struct *)arg;
678
679 local_flush_tlb_mm(mm);
680}
681
682static inline void ipi_flush_tlb_page(void *arg)
683{
684 struct tlb_args *ta = (struct tlb_args *)arg;
685
686 local_flush_tlb_page(ta->ta_vma, ta->ta_start);
687}
688
689static inline void ipi_flush_tlb_kernel_page(void *arg)
690{
691 struct tlb_args *ta = (struct tlb_args *)arg;
692
693 local_flush_tlb_kernel_page(ta->ta_start);
694}
695
696static inline void ipi_flush_tlb_range(void *arg)
697{
698 struct tlb_args *ta = (struct tlb_args *)arg;
699
700 local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end);
701}
702
703static inline void ipi_flush_tlb_kernel_range(void *arg)
704{
705 struct tlb_args *ta = (struct tlb_args *)arg;
706
707 local_flush_tlb_kernel_range(ta->ta_start, ta->ta_end);
708}
709
710void flush_tlb_all(void)
711{
Catalin Marinasfaa7bc52009-05-30 14:00:14 +0100712 if (tlb_ops_need_broadcast())
713 on_each_cpu(ipi_flush_tlb_all, NULL, 1);
714 else
715 local_flush_tlb_all();
Russell King4b0ef3b2005-06-28 13:49:16 +0100716}
717
718void flush_tlb_mm(struct mm_struct *mm)
719{
Catalin Marinasfaa7bc52009-05-30 14:00:14 +0100720 if (tlb_ops_need_broadcast())
Rusty Russell56f8ba82009-09-24 09:34:49 -0600721 on_each_cpu_mask(ipi_flush_tlb_mm, mm, 1, mm_cpumask(mm));
Catalin Marinasfaa7bc52009-05-30 14:00:14 +0100722 else
723 local_flush_tlb_mm(mm);
Russell King4b0ef3b2005-06-28 13:49:16 +0100724}
725
726void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
727{
Catalin Marinasfaa7bc52009-05-30 14:00:14 +0100728 if (tlb_ops_need_broadcast()) {
729 struct tlb_args ta;
730 ta.ta_vma = vma;
731 ta.ta_start = uaddr;
Rusty Russell56f8ba82009-09-24 09:34:49 -0600732 on_each_cpu_mask(ipi_flush_tlb_page, &ta, 1, mm_cpumask(vma->vm_mm));
Catalin Marinasfaa7bc52009-05-30 14:00:14 +0100733 } else
734 local_flush_tlb_page(vma, uaddr);
Russell King4b0ef3b2005-06-28 13:49:16 +0100735}
736
737void flush_tlb_kernel_page(unsigned long kaddr)
738{
Catalin Marinasfaa7bc52009-05-30 14:00:14 +0100739 if (tlb_ops_need_broadcast()) {
740 struct tlb_args ta;
741 ta.ta_start = kaddr;
742 on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1);
743 } else
744 local_flush_tlb_kernel_page(kaddr);
Russell King4b0ef3b2005-06-28 13:49:16 +0100745}
746
747void flush_tlb_range(struct vm_area_struct *vma,
748 unsigned long start, unsigned long end)
749{
Catalin Marinasfaa7bc52009-05-30 14:00:14 +0100750 if (tlb_ops_need_broadcast()) {
751 struct tlb_args ta;
752 ta.ta_vma = vma;
753 ta.ta_start = start;
754 ta.ta_end = end;
Rusty Russell56f8ba82009-09-24 09:34:49 -0600755 on_each_cpu_mask(ipi_flush_tlb_range, &ta, 1, mm_cpumask(vma->vm_mm));
Catalin Marinasfaa7bc52009-05-30 14:00:14 +0100756 } else
757 local_flush_tlb_range(vma, start, end);
Russell King4b0ef3b2005-06-28 13:49:16 +0100758}
759
760void flush_tlb_kernel_range(unsigned long start, unsigned long end)
761{
Catalin Marinasfaa7bc52009-05-30 14:00:14 +0100762 if (tlb_ops_need_broadcast()) {
763 struct tlb_args ta;
764 ta.ta_start = start;
765 ta.ta_end = end;
766 on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1);
767 } else
768 local_flush_tlb_kernel_range(start, end);
Russell King4b0ef3b2005-06-28 13:49:16 +0100769}