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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public License
4 * as published by the Free Software Foundation; either version 2
5 * of the License, or (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
15 *
16 * Copyright (C) 2000, 2001 Kanoj Sarcar
17 * Copyright (C) 2000, 2001 Ralf Baechle
18 * Copyright (C) 2000, 2001 Silicon Graphics, Inc.
19 * Copyright (C) 2000, 2001, 2003 Broadcom Corporation
20 */
21#include <linux/cache.h>
22#include <linux/delay.h>
23#include <linux/init.h>
24#include <linux/interrupt.h>
25#include <linux/spinlock.h>
26#include <linux/threads.h>
27#include <linux/module.h>
28#include <linux/time.h>
29#include <linux/timex.h>
30#include <linux/sched.h>
31#include <linux/cpumask.h>
Rojhalat Ibrahim1e35aab2006-02-20 13:35:27 +000032#include <linux/cpu.h>
Alexey Dobriyan4e950f62007-07-30 02:36:13 +040033#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
35#include <asm/atomic.h>
36#include <asm/cpu.h>
37#include <asm/processor.h>
Ralf Baechle39b8d522008-04-28 17:14:26 +010038#include <asm/r4k-timer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <asm/system.h>
40#include <asm/mmu_context.h>
Ralf Baechle7bcf7712007-10-11 23:46:09 +010041#include <asm/time.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
Ralf Baechle41c594a2006-04-05 09:45:45 +010043#ifdef CONFIG_MIPS_MT_SMTC
44#include <asm/mipsmtregs.h>
45#endif /* CONFIG_MIPS_MT_SMTC */
46
Linus Torvalds1da177e2005-04-16 15:20:36 -070047cpumask_t phys_cpu_present_map; /* Bitmask of available CPUs */
48volatile cpumask_t cpu_callin_map; /* Bitmask of started secondaries */
49cpumask_t cpu_online_map; /* Bitmask of currently online CPUs */
50int __cpu_number_map[NR_CPUS]; /* Map physical to logical */
51int __cpu_logical_map[NR_CPUS]; /* Map logical to physical */
52
53EXPORT_SYMBOL(phys_cpu_present_map);
54EXPORT_SYMBOL(cpu_online_map);
55
Robert P. J. Dayb3f6df92007-05-25 14:32:28 -040056extern void cpu_idle(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Ralf Baechle0ab7aef2007-03-02 20:42:04 +000058/* Number of TCs (or siblings in Intel speak) per CPU core */
59int smp_num_siblings = 1;
60EXPORT_SYMBOL(smp_num_siblings);
61
62/* representing the TCs (or siblings in Intel speak) of each logical CPU */
63cpumask_t cpu_sibling_map[NR_CPUS] __read_mostly;
64EXPORT_SYMBOL(cpu_sibling_map);
65
66/* representing cpus for which sibling maps can be computed */
67static cpumask_t cpu_sibling_setup_map;
68
69static inline void set_cpu_sibling_map(int cpu)
70{
71 int i;
72
73 cpu_set(cpu, cpu_sibling_setup_map);
74
75 if (smp_num_siblings > 1) {
76 for_each_cpu_mask(i, cpu_sibling_setup_map) {
77 if (cpu_data[cpu].core == cpu_data[i].core) {
78 cpu_set(i, cpu_sibling_map[cpu]);
79 cpu_set(cpu, cpu_sibling_map[i]);
80 }
81 }
82 } else
83 cpu_set(cpu, cpu_sibling_map[cpu]);
84}
85
Ralf Baechle87353d82007-11-19 12:23:51 +000086struct plat_smp_ops *mp_ops;
87
88__cpuinit void register_smp_ops(struct plat_smp_ops *ops)
89{
Thiemo Seufer83738e32008-05-06 11:21:22 +010090 if (mp_ops)
91 printk(KERN_WARNING "Overriding previously set SMP ops\n");
Ralf Baechle87353d82007-11-19 12:23:51 +000092
93 mp_ops = ops;
94}
95
Linus Torvalds1da177e2005-04-16 15:20:36 -070096/*
97 * First C code run on the secondary CPUs after being started up by
98 * the master.
99 */
Ralf Baechle4ebd5232007-05-31 16:15:01 +0100100asmlinkage __cpuinit void start_secondary(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101{
Nick Piggin5bfb5d62005-11-08 21:39:01 -0800102 unsigned int cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Ralf Baechle41c594a2006-04-05 09:45:45 +0100104#ifdef CONFIG_MIPS_MT_SMTC
105 /* Only do cpu_probe for first TC of CPU */
106 if ((read_c0_tcbind() & TCBIND_CURTC) == 0)
107#endif /* CONFIG_MIPS_MT_SMTC */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 cpu_probe();
109 cpu_report();
110 per_cpu_trap_init();
Ralf Baechle7bcf7712007-10-11 23:46:09 +0100111 mips_clockevent_init();
Ralf Baechle87353d82007-11-19 12:23:51 +0000112 mp_ops->init_secondary();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
114 /*
115 * XXX parity protection should be folded in here when it's converted
116 * to an option instead of something based on .cputype
117 */
118
119 calibrate_delay();
Nick Piggin5bfb5d62005-11-08 21:39:01 -0800120 preempt_disable();
121 cpu = smp_processor_id();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 cpu_data[cpu].udelay_val = loops_per_jiffy;
123
Manfred Spraule545a612008-09-07 16:57:22 +0200124 notify_cpu_starting(cpu);
125
Ralf Baechle87353d82007-11-19 12:23:51 +0000126 mp_ops->smp_finish();
Ralf Baechle0ab7aef2007-03-02 20:42:04 +0000127 set_cpu_sibling_map(cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
129 cpu_set(cpu, cpu_callin_map);
130
Ralf Baechle39b8d522008-04-28 17:14:26 +0100131 synchronise_count_slave();
132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 cpu_idle();
134}
135
Jens Axboe2f304c02008-06-17 10:45:23 +0200136void arch_send_call_function_ipi(cpumask_t mask)
137{
138 mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
139}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
141/*
Jens Axboe2f304c02008-06-17 10:45:23 +0200142 * We reuse the same vector for the single IPI
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 */
Jens Axboe2f304c02008-06-17 10:45:23 +0200144void arch_send_call_function_single_ipi(int cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145{
Jens Axboe2f304c02008-06-17 10:45:23 +0200146 mp_ops->send_ipi_mask(cpumask_of_cpu(cpu), SMP_CALL_FUNCTION);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147}
148
Jens Axboe2f304c02008-06-17 10:45:23 +0200149/*
150 * Call into both interrupt handlers, as we share the IPI for them
151 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152void smp_call_function_interrupt(void)
153{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 irq_enter();
Jens Axboe2f304c02008-06-17 10:45:23 +0200155 generic_smp_call_function_single_interrupt();
156 generic_smp_call_function_interrupt();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 irq_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158}
159
160static void stop_this_cpu(void *dummy)
161{
162 /*
163 * Remove this CPU:
164 */
165 cpu_clear(smp_processor_id(), cpu_online_map);
166 local_irq_enable(); /* May need to service _machine_restart IPI */
167 for (;;); /* Wait if available. */
168}
169
170void smp_send_stop(void)
171{
Jens Axboe8691e5a2008-06-06 11:18:06 +0200172 smp_call_function(stop_this_cpu, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173}
174
175void __init smp_cpus_done(unsigned int max_cpus)
176{
Ralf Baechle87353d82007-11-19 12:23:51 +0000177 mp_ops->cpus_done();
Ralf Baechle39b8d522008-04-28 17:14:26 +0100178 synchronise_count_master();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179}
180
181/* called from main before smp_init() */
182void __init smp_prepare_cpus(unsigned int max_cpus)
183{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 init_new_context(current, &init_mm);
185 current_thread_info()->cpu = 0;
Ralf Baechle87353d82007-11-19 12:23:51 +0000186 mp_ops->prepare_cpus(max_cpus);
Ralf Baechle0ab7aef2007-03-02 20:42:04 +0000187 set_cpu_sibling_map(0);
Ralf Baechle320e6ab2006-05-22 14:24:04 +0100188#ifndef CONFIG_HOTPLUG_CPU
189 cpu_present_map = cpu_possible_map;
190#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191}
192
193/* preload SMP state for boot cpu */
194void __devinit smp_prepare_boot_cpu(void)
195{
196 /*
197 * This assumes that bootup is always handled by the processor
198 * with the logic and physical number 0.
199 */
200 __cpu_number_map[0] = 0;
201 __cpu_logical_map[0] = 0;
202 cpu_set(0, phys_cpu_present_map);
203 cpu_set(0, cpu_online_map);
204 cpu_set(0, cpu_callin_map);
205}
206
207/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 * Called once for each "cpu_possible(cpu)". Needs to spin up the cpu
209 * and keep control until "cpu_online(cpu)" is set. Note: cpu is
210 * physical, not logical.
211 */
Gautham R Shenoyb282b6f2007-01-10 23:15:34 -0800212int __cpuinit __cpu_up(unsigned int cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213{
Ralf Baechleb727a602005-02-22 21:18:01 +0000214 struct task_struct *idle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
Ralf Baechleb727a602005-02-22 21:18:01 +0000216 /*
217 * Processor goes to start_secondary(), sets online flag
218 * The following code is purely to make sure
219 * Linux can schedule processes on this slave.
220 */
221 idle = fork_idle(cpu);
222 if (IS_ERR(idle))
223 panic(KERN_ERR "Fork failed for CPU %d", cpu);
224
Ralf Baechle87353d82007-11-19 12:23:51 +0000225 mp_ops->boot_secondary(cpu, idle);
Ralf Baechleb727a602005-02-22 21:18:01 +0000226
227 /*
228 * Trust is futile. We should really have timeouts ...
229 */
230 while (!cpu_isset(cpu, cpu_callin_map))
231 udelay(100);
232
233 cpu_set(cpu, cpu_online_map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
235 return 0;
236}
237
238/* Not really SMP stuff ... */
239int setup_profiling_timer(unsigned int multiplier)
240{
241 return 0;
242}
243
244static void flush_tlb_all_ipi(void *info)
245{
246 local_flush_tlb_all();
247}
248
249void flush_tlb_all(void)
250{
Jens Axboe15c8b6c2008-05-09 09:39:44 +0200251 on_each_cpu(flush_tlb_all_ipi, NULL, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252}
253
254static void flush_tlb_mm_ipi(void *mm)
255{
256 local_flush_tlb_mm((struct mm_struct *)mm);
257}
258
259/*
Ralf Baechle25969352006-06-22 22:42:32 +0100260 * Special Variant of smp_call_function for use by TLB functions:
261 *
262 * o No return value
263 * o collapses to normal function call on UP kernels
264 * o collapses to normal function call on systems with a single shared
265 * primary cache.
266 * o CONFIG_MIPS_MT_SMTC currently implies there is only one physical core.
267 */
268static inline void smp_on_other_tlbs(void (*func) (void *info), void *info)
269{
270#ifndef CONFIG_MIPS_MT_SMTC
Jens Axboe8691e5a2008-06-06 11:18:06 +0200271 smp_call_function(func, info, 1);
Ralf Baechle25969352006-06-22 22:42:32 +0100272#endif
273}
274
275static inline void smp_on_each_tlb(void (*func) (void *info), void *info)
276{
277 preempt_disable();
278
279 smp_on_other_tlbs(func, info);
280 func(info);
281
282 preempt_enable();
283}
284
285/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 * The following tlb flush calls are invoked when old translations are
287 * being torn down, or pte attributes are changing. For single threaded
288 * address spaces, a new context is obtained on the current cpu, and tlb
289 * context on other cpus are invalidated to force a new context allocation
290 * at switch_mm time, should the mm ever be used on other cpus. For
291 * multithreaded address spaces, intercpu interrupts have to be sent.
292 * Another case where intercpu interrupts are required is when the target
293 * mm might be active on another cpu (eg debuggers doing the flushes on
294 * behalf of debugees, kswapd stealing pages from another process etc).
295 * Kanoj 07/00.
296 */
297
298void flush_tlb_mm(struct mm_struct *mm)
299{
300 preempt_disable();
301
302 if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
Ralf Baechlec50cade2007-10-04 16:57:08 +0100303 smp_on_other_tlbs(flush_tlb_mm_ipi, mm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 } else {
Ralf Baechleb5eb5512007-10-03 19:16:57 +0100305 cpumask_t mask = cpu_online_map;
306 unsigned int cpu;
307
308 cpu_clear(smp_processor_id(), mask);
Ralf Baechleece8a9e2007-10-12 15:03:38 +0100309 for_each_cpu_mask(cpu, mask)
Ralf Baechleb5eb5512007-10-03 19:16:57 +0100310 if (cpu_context(cpu, mm))
311 cpu_context(cpu, mm) = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 }
313 local_flush_tlb_mm(mm);
314
315 preempt_enable();
316}
317
318struct flush_tlb_data {
319 struct vm_area_struct *vma;
320 unsigned long addr1;
321 unsigned long addr2;
322};
323
324static void flush_tlb_range_ipi(void *info)
325{
Ralf Baechlec50cade2007-10-04 16:57:08 +0100326 struct flush_tlb_data *fd = info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
328 local_flush_tlb_range(fd->vma, fd->addr1, fd->addr2);
329}
330
331void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
332{
333 struct mm_struct *mm = vma->vm_mm;
334
335 preempt_disable();
336 if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
Ralf Baechle89a8a5a2007-10-04 18:18:52 +0100337 struct flush_tlb_data fd = {
338 .vma = vma,
339 .addr1 = start,
340 .addr2 = end,
341 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
Ralf Baechlec50cade2007-10-04 16:57:08 +0100343 smp_on_other_tlbs(flush_tlb_range_ipi, &fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 } else {
Ralf Baechleb5eb5512007-10-03 19:16:57 +0100345 cpumask_t mask = cpu_online_map;
346 unsigned int cpu;
347
348 cpu_clear(smp_processor_id(), mask);
Ralf Baechleece8a9e2007-10-12 15:03:38 +0100349 for_each_cpu_mask(cpu, mask)
Ralf Baechleb5eb5512007-10-03 19:16:57 +0100350 if (cpu_context(cpu, mm))
351 cpu_context(cpu, mm) = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 }
353 local_flush_tlb_range(vma, start, end);
354 preempt_enable();
355}
356
357static void flush_tlb_kernel_range_ipi(void *info)
358{
Ralf Baechlec50cade2007-10-04 16:57:08 +0100359 struct flush_tlb_data *fd = info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
361 local_flush_tlb_kernel_range(fd->addr1, fd->addr2);
362}
363
364void flush_tlb_kernel_range(unsigned long start, unsigned long end)
365{
Ralf Baechle89a8a5a2007-10-04 18:18:52 +0100366 struct flush_tlb_data fd = {
367 .addr1 = start,
368 .addr2 = end,
369 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
Jens Axboe15c8b6c2008-05-09 09:39:44 +0200371 on_each_cpu(flush_tlb_kernel_range_ipi, &fd, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372}
373
374static void flush_tlb_page_ipi(void *info)
375{
Ralf Baechlec50cade2007-10-04 16:57:08 +0100376 struct flush_tlb_data *fd = info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
378 local_flush_tlb_page(fd->vma, fd->addr1);
379}
380
381void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
382{
383 preempt_disable();
384 if ((atomic_read(&vma->vm_mm->mm_users) != 1) || (current->mm != vma->vm_mm)) {
Ralf Baechle89a8a5a2007-10-04 18:18:52 +0100385 struct flush_tlb_data fd = {
386 .vma = vma,
387 .addr1 = page,
388 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
Ralf Baechlec50cade2007-10-04 16:57:08 +0100390 smp_on_other_tlbs(flush_tlb_page_ipi, &fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 } else {
Ralf Baechleb5eb5512007-10-03 19:16:57 +0100392 cpumask_t mask = cpu_online_map;
393 unsigned int cpu;
394
395 cpu_clear(smp_processor_id(), mask);
Ralf Baechleece8a9e2007-10-12 15:03:38 +0100396 for_each_cpu_mask(cpu, mask)
Ralf Baechleb5eb5512007-10-03 19:16:57 +0100397 if (cpu_context(cpu, vma->vm_mm))
398 cpu_context(cpu, vma->vm_mm) = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 }
400 local_flush_tlb_page(vma, page);
401 preempt_enable();
402}
403
404static void flush_tlb_one_ipi(void *info)
405{
406 unsigned long vaddr = (unsigned long) info;
407
408 local_flush_tlb_one(vaddr);
409}
410
411void flush_tlb_one(unsigned long vaddr)
412{
Ralf Baechle25969352006-06-22 22:42:32 +0100413 smp_on_each_tlb(flush_tlb_one_ipi, (void *) vaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414}
415
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416EXPORT_SYMBOL(flush_tlb_page);
417EXPORT_SYMBOL(flush_tlb_one);