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1da177e4 LT |
1 | /* |
2 | * linux/arch/m32r/kernel/smp.c | |
3 | * | |
4 | * M32R SMP support routines. | |
5 | * | |
6 | * Copyright (c) 2001, 2002 Hitoshi Yamamoto | |
7 | * | |
8 | * Taken from i386 version. | |
9 | * (c) 1995 Alan Cox, Building #3 <alan@redhat.com> | |
10 | * (c) 1998-99, 2000 Ingo Molnar <mingo@redhat.com> | |
11 | * | |
12 | * This code is released under the GNU General Public License version 2 or | |
13 | * later. | |
14 | */ | |
15 | ||
16 | #undef DEBUG_SMP | |
17 | ||
18 | #include <linux/irq.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/smp.h> | |
23 | #include <linux/profile.h> | |
24 | #include <linux/cpu.h> | |
25 | ||
26 | #include <asm/cacheflush.h> | |
27 | #include <asm/pgalloc.h> | |
28 | #include <asm/atomic.h> | |
29 | #include <asm/io.h> | |
30 | #include <asm/mmu_context.h> | |
31 | #include <asm/m32r.h> | |
32 | ||
33 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
34 | /* Data structures and variables */ | |
35 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
36 | ||
37 | /* | |
38 | * Structure and data for smp_call_function(). This is designed to minimise | |
39 | * static memory requirements. It also looks cleaner. | |
40 | */ | |
41 | static DEFINE_SPINLOCK(call_lock); | |
42 | ||
43 | struct call_data_struct { | |
44 | void (*func) (void *info); | |
45 | void *info; | |
46 | atomic_t started; | |
47 | atomic_t finished; | |
48 | int wait; | |
49 | } __attribute__ ((__aligned__(SMP_CACHE_BYTES))); | |
50 | ||
51 | static struct call_data_struct *call_data; | |
52 | ||
53 | /* | |
54 | * For flush_cache_all() | |
55 | */ | |
56 | static DEFINE_SPINLOCK(flushcache_lock); | |
57 | static volatile unsigned long flushcache_cpumask = 0; | |
58 | ||
59 | /* | |
60 | * For flush_tlb_others() | |
61 | */ | |
62 | static volatile cpumask_t flush_cpumask; | |
63 | static struct mm_struct *flush_mm; | |
64 | static struct vm_area_struct *flush_vma; | |
65 | static volatile unsigned long flush_va; | |
66 | static DEFINE_SPINLOCK(tlbstate_lock); | |
67 | #define FLUSH_ALL 0xffffffff | |
68 | ||
69 | DECLARE_PER_CPU(int, prof_multiplier); | |
70 | DECLARE_PER_CPU(int, prof_old_multiplier); | |
71 | DECLARE_PER_CPU(int, prof_counter); | |
72 | ||
73 | extern spinlock_t ipi_lock[]; | |
74 | ||
75 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
76 | /* Function Prototypes */ | |
77 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
78 | ||
79 | void smp_send_reschedule(int); | |
80 | void smp_reschedule_interrupt(void); | |
81 | ||
82 | void smp_flush_cache_all(void); | |
83 | void smp_flush_cache_all_interrupt(void); | |
84 | ||
85 | void smp_flush_tlb_all(void); | |
86 | static void flush_tlb_all_ipi(void *); | |
87 | ||
88 | void smp_flush_tlb_mm(struct mm_struct *); | |
89 | void smp_flush_tlb_range(struct vm_area_struct *, unsigned long, \ | |
90 | unsigned long); | |
91 | void smp_flush_tlb_page(struct vm_area_struct *, unsigned long); | |
92 | static void flush_tlb_others(cpumask_t, struct mm_struct *, | |
93 | struct vm_area_struct *, unsigned long); | |
94 | void smp_invalidate_interrupt(void); | |
95 | ||
96 | void smp_send_stop(void); | |
97 | static void stop_this_cpu(void *); | |
98 | ||
99 | int smp_call_function(void (*) (void *), void *, int, int); | |
100 | void smp_call_function_interrupt(void); | |
101 | ||
102 | void smp_send_timer(void); | |
103 | void smp_ipi_timer_interrupt(struct pt_regs *); | |
104 | void smp_local_timer_interrupt(struct pt_regs *); | |
105 | ||
106 | void send_IPI_allbutself(int, int); | |
107 | static void send_IPI_mask(cpumask_t, int, int); | |
108 | unsigned long send_IPI_mask_phys(cpumask_t, int, int); | |
109 | ||
110 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
111 | /* Rescheduling request Routines */ | |
112 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
113 | ||
114 | /*==========================================================================* | |
115 | * Name: smp_send_reschedule | |
116 | * | |
117 | * Description: This routine requests other CPU to execute rescheduling. | |
118 | * 1.Send 'RESCHEDULE_IPI' to other CPU. | |
119 | * Request other CPU to execute 'smp_reschedule_interrupt()'. | |
120 | * | |
121 | * Born on Date: 2002.02.05 | |
122 | * | |
123 | * Arguments: cpu_id - Target CPU ID | |
124 | * | |
125 | * Returns: void (cannot fail) | |
126 | * | |
127 | * Modification log: | |
128 | * Date Who Description | |
129 | * ---------- --- -------------------------------------------------------- | |
130 | * | |
131 | *==========================================================================*/ | |
132 | void smp_send_reschedule(int cpu_id) | |
133 | { | |
134 | WARN_ON(cpu_is_offline(cpu_id)); | |
135 | send_IPI_mask(cpumask_of_cpu(cpu_id), RESCHEDULE_IPI, 1); | |
136 | } | |
137 | ||
138 | /*==========================================================================* | |
139 | * Name: smp_reschedule_interrupt | |
140 | * | |
141 | * Description: This routine executes on CPU which received | |
142 | * 'RESCHEDULE_IPI'. | |
143 | * Rescheduling is processed at the exit of interrupt | |
144 | * operation. | |
145 | * | |
146 | * Born on Date: 2002.02.05 | |
147 | * | |
148 | * Arguments: NONE | |
149 | * | |
150 | * Returns: void (cannot fail) | |
151 | * | |
152 | * Modification log: | |
153 | * Date Who Description | |
154 | * ---------- --- -------------------------------------------------------- | |
155 | * | |
156 | *==========================================================================*/ | |
157 | void smp_reschedule_interrupt(void) | |
158 | { | |
159 | /* nothing to do */ | |
160 | } | |
161 | ||
162 | /*==========================================================================* | |
163 | * Name: smp_flush_cache_all | |
164 | * | |
165 | * Description: This routine sends a 'INVALIDATE_CACHE_IPI' to all other | |
166 | * CPUs in the system. | |
167 | * | |
168 | * Born on Date: 2003-05-28 | |
169 | * | |
170 | * Arguments: NONE | |
171 | * | |
172 | * Returns: void (cannot fail) | |
173 | * | |
174 | * Modification log: | |
175 | * Date Who Description | |
176 | * ---------- --- -------------------------------------------------------- | |
177 | * | |
178 | *==========================================================================*/ | |
179 | void smp_flush_cache_all(void) | |
180 | { | |
181 | cpumask_t cpumask; | |
182 | unsigned long *mask; | |
183 | ||
184 | preempt_disable(); | |
185 | cpumask = cpu_online_map; | |
186 | cpu_clear(smp_processor_id(), cpumask); | |
187 | spin_lock(&flushcache_lock); | |
188 | mask=cpus_addr(cpumask); | |
189 | atomic_set_mask(*mask, (atomic_t *)&flushcache_cpumask); | |
190 | send_IPI_mask(cpumask, INVALIDATE_CACHE_IPI, 0); | |
191 | _flush_cache_copyback_all(); | |
192 | while (flushcache_cpumask) | |
193 | mb(); | |
194 | spin_unlock(&flushcache_lock); | |
195 | preempt_enable(); | |
196 | } | |
197 | ||
198 | void smp_flush_cache_all_interrupt(void) | |
199 | { | |
200 | _flush_cache_copyback_all(); | |
201 | clear_bit(smp_processor_id(), &flushcache_cpumask); | |
202 | } | |
203 | ||
204 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
205 | /* TLB flush request Routins */ | |
206 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
207 | ||
208 | /*==========================================================================* | |
209 | * Name: smp_flush_tlb_all | |
210 | * | |
211 | * Description: This routine flushes all processes TLBs. | |
212 | * 1.Request other CPU to execute 'flush_tlb_all_ipi()'. | |
213 | * 2.Execute 'do_flush_tlb_all_local()'. | |
214 | * | |
215 | * Born on Date: 2002.02.05 | |
216 | * | |
217 | * Arguments: NONE | |
218 | * | |
219 | * Returns: void (cannot fail) | |
220 | * | |
221 | * Modification log: | |
222 | * Date Who Description | |
223 | * ---------- --- -------------------------------------------------------- | |
224 | * | |
225 | *==========================================================================*/ | |
226 | void smp_flush_tlb_all(void) | |
227 | { | |
228 | unsigned long flags; | |
229 | ||
230 | preempt_disable(); | |
231 | local_irq_save(flags); | |
232 | __flush_tlb_all(); | |
233 | local_irq_restore(flags); | |
234 | smp_call_function(flush_tlb_all_ipi, 0, 1, 1); | |
235 | preempt_enable(); | |
236 | } | |
237 | ||
238 | /*==========================================================================* | |
239 | * Name: flush_tlb_all_ipi | |
240 | * | |
241 | * Description: This routine flushes all local TLBs. | |
242 | * 1.Execute 'do_flush_tlb_all_local()'. | |
243 | * | |
244 | * Born on Date: 2002.02.05 | |
245 | * | |
246 | * Arguments: *info - not used | |
247 | * | |
248 | * Returns: void (cannot fail) | |
249 | * | |
250 | * Modification log: | |
251 | * Date Who Description | |
252 | * ---------- --- -------------------------------------------------------- | |
253 | * | |
254 | *==========================================================================*/ | |
255 | static void flush_tlb_all_ipi(void *info) | |
256 | { | |
257 | __flush_tlb_all(); | |
258 | } | |
259 | ||
260 | /*==========================================================================* | |
261 | * Name: smp_flush_tlb_mm | |
262 | * | |
263 | * Description: This routine flushes the specified mm context TLB's. | |
264 | * | |
265 | * Born on Date: 2002.02.05 | |
266 | * | |
267 | * Arguments: *mm - a pointer to the mm struct for flush TLB | |
268 | * | |
269 | * Returns: void (cannot fail) | |
270 | * | |
271 | * Modification log: | |
272 | * Date Who Description | |
273 | * ---------- --- -------------------------------------------------------- | |
274 | * | |
275 | *==========================================================================*/ | |
276 | void smp_flush_tlb_mm(struct mm_struct *mm) | |
277 | { | |
a90933fb | 278 | int cpu_id; |
1da177e4 | 279 | cpumask_t cpu_mask; |
a90933fb | 280 | unsigned long *mmc; |
1da177e4 LT |
281 | unsigned long flags; |
282 | ||
283 | preempt_disable(); | |
a90933fb HT |
284 | cpu_id = smp_processor_id(); |
285 | mmc = &mm->context[cpu_id]; | |
1da177e4 LT |
286 | cpu_mask = mm->cpu_vm_mask; |
287 | cpu_clear(cpu_id, cpu_mask); | |
288 | ||
289 | if (*mmc != NO_CONTEXT) { | |
290 | local_irq_save(flags); | |
291 | *mmc = NO_CONTEXT; | |
292 | if (mm == current->mm) | |
293 | activate_context(mm); | |
294 | else | |
295 | cpu_clear(cpu_id, mm->cpu_vm_mask); | |
296 | local_irq_restore(flags); | |
297 | } | |
298 | if (!cpus_empty(cpu_mask)) | |
299 | flush_tlb_others(cpu_mask, mm, NULL, FLUSH_ALL); | |
300 | ||
301 | preempt_enable(); | |
302 | } | |
303 | ||
304 | /*==========================================================================* | |
305 | * Name: smp_flush_tlb_range | |
306 | * | |
307 | * Description: This routine flushes a range of pages. | |
308 | * | |
309 | * Born on Date: 2002.02.05 | |
310 | * | |
311 | * Arguments: *mm - a pointer to the mm struct for flush TLB | |
312 | * start - not used | |
313 | * end - not used | |
314 | * | |
315 | * Returns: void (cannot fail) | |
316 | * | |
317 | * Modification log: | |
318 | * Date Who Description | |
319 | * ---------- --- -------------------------------------------------------- | |
320 | * | |
321 | *==========================================================================*/ | |
322 | void smp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, | |
323 | unsigned long end) | |
324 | { | |
325 | smp_flush_tlb_mm(vma->vm_mm); | |
326 | } | |
327 | ||
328 | /*==========================================================================* | |
329 | * Name: smp_flush_tlb_page | |
330 | * | |
331 | * Description: This routine flushes one page. | |
332 | * | |
333 | * Born on Date: 2002.02.05 | |
334 | * | |
335 | * Arguments: *vma - a pointer to the vma struct include va | |
336 | * va - virtual address for flush TLB | |
337 | * | |
338 | * Returns: void (cannot fail) | |
339 | * | |
340 | * Modification log: | |
341 | * Date Who Description | |
342 | * ---------- --- -------------------------------------------------------- | |
343 | * | |
344 | *==========================================================================*/ | |
345 | void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long va) | |
346 | { | |
347 | struct mm_struct *mm = vma->vm_mm; | |
a90933fb | 348 | int cpu_id; |
1da177e4 | 349 | cpumask_t cpu_mask; |
a90933fb | 350 | unsigned long *mmc; |
1da177e4 LT |
351 | unsigned long flags; |
352 | ||
353 | preempt_disable(); | |
a90933fb HT |
354 | cpu_id = smp_processor_id(); |
355 | mmc = &mm->context[cpu_id]; | |
1da177e4 LT |
356 | cpu_mask = mm->cpu_vm_mask; |
357 | cpu_clear(cpu_id, cpu_mask); | |
358 | ||
359 | #ifdef DEBUG_SMP | |
360 | if (!mm) | |
361 | BUG(); | |
362 | #endif | |
363 | ||
364 | if (*mmc != NO_CONTEXT) { | |
365 | local_irq_save(flags); | |
366 | va &= PAGE_MASK; | |
367 | va |= (*mmc & MMU_CONTEXT_ASID_MASK); | |
368 | __flush_tlb_page(va); | |
369 | local_irq_restore(flags); | |
370 | } | |
371 | if (!cpus_empty(cpu_mask)) | |
372 | flush_tlb_others(cpu_mask, mm, vma, va); | |
373 | ||
374 | preempt_enable(); | |
375 | } | |
376 | ||
377 | /*==========================================================================* | |
378 | * Name: flush_tlb_others | |
379 | * | |
380 | * Description: This routine requests other CPU to execute flush TLB. | |
381 | * 1.Setup parmeters. | |
382 | * 2.Send 'INVALIDATE_TLB_IPI' to other CPU. | |
383 | * Request other CPU to execute 'smp_invalidate_interrupt()'. | |
384 | * 3.Wait for other CPUs operation finished. | |
385 | * | |
386 | * Born on Date: 2002.02.05 | |
387 | * | |
388 | * Arguments: cpumask - bitmap of target CPUs | |
389 | * *mm - a pointer to the mm struct for flush TLB | |
390 | * *vma - a pointer to the vma struct include va | |
391 | * va - virtual address for flush TLB | |
392 | * | |
393 | * Returns: void (cannot fail) | |
394 | * | |
395 | * Modification log: | |
396 | * Date Who Description | |
397 | * ---------- --- -------------------------------------------------------- | |
398 | * | |
399 | *==========================================================================*/ | |
400 | static void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm, | |
401 | struct vm_area_struct *vma, unsigned long va) | |
402 | { | |
403 | unsigned long *mask; | |
404 | #ifdef DEBUG_SMP | |
405 | unsigned long flags; | |
406 | __save_flags(flags); | |
407 | if (!(flags & 0x0040)) /* Interrupt Disable NONONO */ | |
408 | BUG(); | |
409 | #endif /* DEBUG_SMP */ | |
410 | ||
411 | /* | |
412 | * A couple of (to be removed) sanity checks: | |
413 | * | |
414 | * - we do not send IPIs to not-yet booted CPUs. | |
415 | * - current CPU must not be in mask | |
416 | * - mask must exist :) | |
417 | */ | |
418 | BUG_ON(cpus_empty(cpumask)); | |
419 | ||
420 | BUG_ON(cpu_isset(smp_processor_id(), cpumask)); | |
421 | BUG_ON(!mm); | |
422 | ||
423 | /* If a CPU which we ran on has gone down, OK. */ | |
424 | cpus_and(cpumask, cpumask, cpu_online_map); | |
425 | if (cpus_empty(cpumask)) | |
426 | return; | |
427 | ||
428 | /* | |
429 | * i'm not happy about this global shared spinlock in the | |
430 | * MM hot path, but we'll see how contended it is. | |
431 | * Temporarily this turns IRQs off, so that lockups are | |
432 | * detected by the NMI watchdog. | |
433 | */ | |
434 | spin_lock(&tlbstate_lock); | |
435 | ||
436 | flush_mm = mm; | |
437 | flush_vma = vma; | |
438 | flush_va = va; | |
439 | mask=cpus_addr(cpumask); | |
440 | atomic_set_mask(*mask, (atomic_t *)&flush_cpumask); | |
441 | ||
442 | /* | |
443 | * We have to send the IPI only to | |
444 | * CPUs affected. | |
445 | */ | |
446 | send_IPI_mask(cpumask, INVALIDATE_TLB_IPI, 0); | |
447 | ||
448 | while (!cpus_empty(flush_cpumask)) { | |
449 | /* nothing. lockup detection does not belong here */ | |
450 | mb(); | |
451 | } | |
452 | ||
453 | flush_mm = NULL; | |
454 | flush_vma = NULL; | |
455 | flush_va = 0; | |
456 | spin_unlock(&tlbstate_lock); | |
457 | } | |
458 | ||
459 | /*==========================================================================* | |
460 | * Name: smp_invalidate_interrupt | |
461 | * | |
462 | * Description: This routine executes on CPU which received | |
463 | * 'INVALIDATE_TLB_IPI'. | |
464 | * 1.Flush local TLB. | |
465 | * 2.Report flush TLB process was finished. | |
466 | * | |
467 | * Born on Date: 2002.02.05 | |
468 | * | |
469 | * Arguments: NONE | |
470 | * | |
471 | * Returns: void (cannot fail) | |
472 | * | |
473 | * Modification log: | |
474 | * Date Who Description | |
475 | * ---------- --- -------------------------------------------------------- | |
476 | * | |
477 | *==========================================================================*/ | |
478 | void smp_invalidate_interrupt(void) | |
479 | { | |
480 | int cpu_id = smp_processor_id(); | |
481 | unsigned long *mmc = &flush_mm->context[cpu_id]; | |
482 | ||
483 | if (!cpu_isset(cpu_id, flush_cpumask)) | |
484 | return; | |
485 | ||
486 | if (flush_va == FLUSH_ALL) { | |
487 | *mmc = NO_CONTEXT; | |
488 | if (flush_mm == current->active_mm) | |
489 | activate_context(flush_mm); | |
490 | else | |
491 | cpu_clear(cpu_id, flush_mm->cpu_vm_mask); | |
492 | } else { | |
493 | unsigned long va = flush_va; | |
494 | ||
495 | if (*mmc != NO_CONTEXT) { | |
496 | va &= PAGE_MASK; | |
497 | va |= (*mmc & MMU_CONTEXT_ASID_MASK); | |
498 | __flush_tlb_page(va); | |
499 | } | |
500 | } | |
501 | cpu_clear(cpu_id, flush_cpumask); | |
502 | } | |
503 | ||
504 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
505 | /* Stop CPU request Routins */ | |
506 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
507 | ||
508 | /*==========================================================================* | |
509 | * Name: smp_send_stop | |
510 | * | |
511 | * Description: This routine requests stop all CPUs. | |
512 | * 1.Request other CPU to execute 'stop_this_cpu()'. | |
513 | * | |
514 | * Born on Date: 2002.02.05 | |
515 | * | |
516 | * Arguments: NONE | |
517 | * | |
518 | * Returns: void (cannot fail) | |
519 | * | |
520 | * Modification log: | |
521 | * Date Who Description | |
522 | * ---------- --- -------------------------------------------------------- | |
523 | * | |
524 | *==========================================================================*/ | |
525 | void smp_send_stop(void) | |
526 | { | |
527 | smp_call_function(stop_this_cpu, NULL, 1, 0); | |
528 | } | |
529 | ||
530 | /*==========================================================================* | |
531 | * Name: stop_this_cpu | |
532 | * | |
533 | * Description: This routine halt CPU. | |
534 | * | |
535 | * Born on Date: 2002.02.05 | |
536 | * | |
537 | * Arguments: NONE | |
538 | * | |
539 | * Returns: void (cannot fail) | |
540 | * | |
541 | * Modification log: | |
542 | * Date Who Description | |
543 | * ---------- --- -------------------------------------------------------- | |
544 | * | |
545 | *==========================================================================*/ | |
546 | static void stop_this_cpu(void *dummy) | |
547 | { | |
548 | int cpu_id = smp_processor_id(); | |
549 | ||
550 | /* | |
551 | * Remove this CPU: | |
552 | */ | |
553 | cpu_clear(cpu_id, cpu_online_map); | |
554 | ||
555 | /* | |
556 | * PSW IE = 1; | |
557 | * IMASK = 0; | |
558 | * goto SLEEP | |
559 | */ | |
560 | local_irq_disable(); | |
561 | outl(0, M32R_ICU_IMASK_PORTL); | |
562 | inl(M32R_ICU_IMASK_PORTL); /* dummy read */ | |
563 | local_irq_enable(); | |
564 | ||
565 | for ( ; ; ); | |
566 | } | |
567 | ||
568 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
569 | /* Call function Routins */ | |
570 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
571 | ||
572 | /*==========================================================================* | |
573 | * Name: smp_call_function | |
574 | * | |
575 | * Description: This routine sends a 'CALL_FUNCTION_IPI' to all other CPUs | |
576 | * in the system. | |
577 | * | |
578 | * Born on Date: 2002.02.05 | |
579 | * | |
580 | * Arguments: *func - The function to run. This must be fast and | |
581 | * non-blocking. | |
582 | * *info - An arbitrary pointer to pass to the function. | |
583 | * nonatomic - currently unused. | |
584 | * wait - If true, wait (atomically) until function has | |
585 | * completed on other CPUs. | |
586 | * | |
587 | * Returns: 0 on success, else a negative status code. Does not return | |
588 | * until remote CPUs are nearly ready to execute <<func>> or | |
589 | * are or have executed. | |
590 | * | |
591 | * Cautions: You must not call this function with disabled interrupts or | |
592 | * from a hardware interrupt handler, you may call it from a | |
593 | * bottom half handler. | |
594 | * | |
595 | * Modification log: | |
596 | * Date Who Description | |
597 | * ---------- --- -------------------------------------------------------- | |
598 | * | |
599 | *==========================================================================*/ | |
600 | int smp_call_function(void (*func) (void *info), void *info, int nonatomic, | |
601 | int wait) | |
602 | { | |
603 | struct call_data_struct data; | |
604 | int cpus; | |
605 | ||
606 | #ifdef DEBUG_SMP | |
607 | unsigned long flags; | |
608 | __save_flags(flags); | |
609 | if (!(flags & 0x0040)) /* Interrupt Disable NONONO */ | |
610 | BUG(); | |
611 | #endif /* DEBUG_SMP */ | |
612 | ||
613 | /* Holding any lock stops cpus from going down. */ | |
614 | spin_lock(&call_lock); | |
615 | cpus = num_online_cpus() - 1; | |
616 | ||
617 | if (!cpus) { | |
618 | spin_unlock(&call_lock); | |
619 | return 0; | |
620 | } | |
621 | ||
622 | /* Can deadlock when called with interrupts disabled */ | |
623 | WARN_ON(irqs_disabled()); | |
624 | ||
625 | data.func = func; | |
626 | data.info = info; | |
627 | atomic_set(&data.started, 0); | |
628 | data.wait = wait; | |
629 | if (wait) | |
630 | atomic_set(&data.finished, 0); | |
631 | ||
632 | call_data = &data; | |
633 | mb(); | |
634 | ||
635 | /* Send a message to all other CPUs and wait for them to respond */ | |
636 | send_IPI_allbutself(CALL_FUNCTION_IPI, 0); | |
637 | ||
638 | /* Wait for response */ | |
639 | while (atomic_read(&data.started) != cpus) | |
640 | barrier(); | |
641 | ||
642 | if (wait) | |
643 | while (atomic_read(&data.finished) != cpus) | |
644 | barrier(); | |
645 | spin_unlock(&call_lock); | |
646 | ||
647 | return 0; | |
648 | } | |
649 | ||
650 | /*==========================================================================* | |
651 | * Name: smp_call_function_interrupt | |
652 | * | |
653 | * Description: This routine executes on CPU which received | |
654 | * 'CALL_FUNCTION_IPI'. | |
655 | * | |
656 | * Born on Date: 2002.02.05 | |
657 | * | |
658 | * Arguments: NONE | |
659 | * | |
660 | * Returns: void (cannot fail) | |
661 | * | |
662 | * Modification log: | |
663 | * Date Who Description | |
664 | * ---------- --- -------------------------------------------------------- | |
665 | * | |
666 | *==========================================================================*/ | |
667 | void smp_call_function_interrupt(void) | |
668 | { | |
669 | void (*func) (void *info) = call_data->func; | |
670 | void *info = call_data->info; | |
671 | int wait = call_data->wait; | |
672 | ||
673 | /* | |
674 | * Notify initiating CPU that I've grabbed the data and am | |
675 | * about to execute the function | |
676 | */ | |
677 | mb(); | |
678 | atomic_inc(&call_data->started); | |
679 | /* | |
680 | * At this point the info structure may be out of scope unless wait==1 | |
681 | */ | |
682 | irq_enter(); | |
683 | (*func)(info); | |
684 | irq_exit(); | |
685 | ||
686 | if (wait) { | |
687 | mb(); | |
688 | atomic_inc(&call_data->finished); | |
689 | } | |
690 | } | |
691 | ||
692 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
693 | /* Timer Routins */ | |
694 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
695 | ||
696 | /*==========================================================================* | |
697 | * Name: smp_send_timer | |
698 | * | |
699 | * Description: This routine sends a 'LOCAL_TIMER_IPI' to all other CPUs | |
700 | * in the system. | |
701 | * | |
702 | * Born on Date: 2002.02.05 | |
703 | * | |
704 | * Arguments: NONE | |
705 | * | |
706 | * Returns: void (cannot fail) | |
707 | * | |
708 | * Modification log: | |
709 | * Date Who Description | |
710 | * ---------- --- -------------------------------------------------------- | |
711 | * | |
712 | *==========================================================================*/ | |
713 | void smp_send_timer(void) | |
714 | { | |
715 | send_IPI_allbutself(LOCAL_TIMER_IPI, 1); | |
716 | } | |
717 | ||
718 | /*==========================================================================* | |
719 | * Name: smp_send_timer | |
720 | * | |
721 | * Description: This routine executes on CPU which received | |
722 | * 'LOCAL_TIMER_IPI'. | |
723 | * | |
724 | * Born on Date: 2002.02.05 | |
725 | * | |
726 | * Arguments: *regs - a pointer to the saved regster info | |
727 | * | |
728 | * Returns: void (cannot fail) | |
729 | * | |
730 | * Modification log: | |
731 | * Date Who Description | |
732 | * ---------- --- -------------------------------------------------------- | |
733 | * | |
734 | *==========================================================================*/ | |
735 | void smp_ipi_timer_interrupt(struct pt_regs *regs) | |
736 | { | |
737 | irq_enter(); | |
738 | smp_local_timer_interrupt(regs); | |
739 | irq_exit(); | |
740 | } | |
741 | ||
742 | /*==========================================================================* | |
743 | * Name: smp_local_timer_interrupt | |
744 | * | |
745 | * Description: Local timer interrupt handler. It does both profiling and | |
746 | * process statistics/rescheduling. | |
747 | * We do profiling in every local tick, statistics/rescheduling | |
748 | * happen only every 'profiling multiplier' ticks. The default | |
749 | * multiplier is 1 and it can be changed by writing the new | |
750 | * multiplier value into /proc/profile. | |
751 | * | |
752 | * Born on Date: 2002.02.05 | |
753 | * | |
754 | * Arguments: *regs - a pointer to the saved regster info | |
755 | * | |
756 | * Returns: void (cannot fail) | |
757 | * | |
758 | * Original: arch/i386/kernel/apic.c | |
759 | * | |
760 | * Modification log: | |
761 | * Date Who Description | |
762 | * ---------- --- -------------------------------------------------------- | |
763 | * 2003-06-24 hy use per_cpu structure. | |
764 | *==========================================================================*/ | |
765 | void smp_local_timer_interrupt(struct pt_regs *regs) | |
766 | { | |
767 | int user = user_mode(regs); | |
768 | int cpu_id = smp_processor_id(); | |
769 | ||
770 | /* | |
771 | * The profiling function is SMP safe. (nothing can mess | |
772 | * around with "current", and the profiling counters are | |
773 | * updated with atomic operations). This is especially | |
774 | * useful with a profiling multiplier != 1 | |
775 | */ | |
776 | ||
777 | profile_tick(CPU_PROFILING, regs); | |
778 | ||
779 | if (--per_cpu(prof_counter, cpu_id) <= 0) { | |
780 | /* | |
781 | * The multiplier may have changed since the last time we got | |
782 | * to this point as a result of the user writing to | |
783 | * /proc/profile. In this case we need to adjust the APIC | |
784 | * timer accordingly. | |
785 | * | |
786 | * Interrupts are already masked off at this point. | |
787 | */ | |
788 | per_cpu(prof_counter, cpu_id) | |
789 | = per_cpu(prof_multiplier, cpu_id); | |
790 | if (per_cpu(prof_counter, cpu_id) | |
791 | != per_cpu(prof_old_multiplier, cpu_id)) | |
792 | { | |
793 | per_cpu(prof_old_multiplier, cpu_id) | |
794 | = per_cpu(prof_counter, cpu_id); | |
795 | } | |
796 | ||
797 | update_process_times(user); | |
798 | } | |
799 | } | |
800 | ||
801 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
802 | /* Send IPI Routins */ | |
803 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
804 | ||
805 | /*==========================================================================* | |
806 | * Name: send_IPI_allbutself | |
807 | * | |
808 | * Description: This routine sends a IPI to all other CPUs in the system. | |
809 | * | |
810 | * Born on Date: 2002.02.05 | |
811 | * | |
812 | * Arguments: ipi_num - Number of IPI | |
813 | * try - 0 : Send IPI certainly. | |
814 | * !0 : The following IPI is not sended when Target CPU | |
815 | * has not received the before IPI. | |
816 | * | |
817 | * Returns: void (cannot fail) | |
818 | * | |
819 | * Modification log: | |
820 | * Date Who Description | |
821 | * ---------- --- -------------------------------------------------------- | |
822 | * | |
823 | *==========================================================================*/ | |
824 | void send_IPI_allbutself(int ipi_num, int try) | |
825 | { | |
826 | cpumask_t cpumask; | |
827 | ||
828 | cpumask = cpu_online_map; | |
829 | cpu_clear(smp_processor_id(), cpumask); | |
830 | ||
831 | send_IPI_mask(cpumask, ipi_num, try); | |
832 | } | |
833 | ||
834 | /*==========================================================================* | |
835 | * Name: send_IPI_mask | |
836 | * | |
837 | * Description: This routine sends a IPI to CPUs in the system. | |
838 | * | |
839 | * Born on Date: 2002.02.05 | |
840 | * | |
841 | * Arguments: cpu_mask - Bitmap of target CPUs logical ID | |
842 | * ipi_num - Number of IPI | |
843 | * try - 0 : Send IPI certainly. | |
844 | * !0 : The following IPI is not sended when Target CPU | |
845 | * has not received the before IPI. | |
846 | * | |
847 | * Returns: void (cannot fail) | |
848 | * | |
849 | * Modification log: | |
850 | * Date Who Description | |
851 | * ---------- --- -------------------------------------------------------- | |
852 | * | |
853 | *==========================================================================*/ | |
854 | static void send_IPI_mask(cpumask_t cpumask, int ipi_num, int try) | |
855 | { | |
856 | cpumask_t physid_mask, tmp; | |
857 | int cpu_id, phys_id; | |
858 | int num_cpus = num_online_cpus(); | |
859 | ||
860 | if (num_cpus <= 1) /* NO MP */ | |
861 | return; | |
862 | ||
863 | cpus_and(tmp, cpumask, cpu_online_map); | |
864 | BUG_ON(!cpus_equal(cpumask, tmp)); | |
865 | ||
866 | physid_mask = CPU_MASK_NONE; | |
867 | for_each_cpu_mask(cpu_id, cpumask){ | |
868 | if ((phys_id = cpu_to_physid(cpu_id)) != -1) | |
869 | cpu_set(phys_id, physid_mask); | |
870 | } | |
871 | ||
872 | send_IPI_mask_phys(physid_mask, ipi_num, try); | |
873 | } | |
874 | ||
875 | /*==========================================================================* | |
876 | * Name: send_IPI_mask_phys | |
877 | * | |
878 | * Description: This routine sends a IPI to other CPUs in the system. | |
879 | * | |
880 | * Born on Date: 2002.02.05 | |
881 | * | |
882 | * Arguments: cpu_mask - Bitmap of target CPUs physical ID | |
883 | * ipi_num - Number of IPI | |
884 | * try - 0 : Send IPI certainly. | |
885 | * !0 : The following IPI is not sended when Target CPU | |
886 | * has not received the before IPI. | |
887 | * | |
888 | * Returns: IPICRi regster value. | |
889 | * | |
890 | * Modification log: | |
891 | * Date Who Description | |
892 | * ---------- --- -------------------------------------------------------- | |
893 | * | |
894 | *==========================================================================*/ | |
895 | unsigned long send_IPI_mask_phys(cpumask_t physid_mask, int ipi_num, | |
896 | int try) | |
897 | { | |
898 | spinlock_t *ipilock; | |
1da177e4 LT |
899 | volatile unsigned long *ipicr_addr; |
900 | unsigned long ipicr_val; | |
901 | unsigned long my_physid_mask; | |
902 | unsigned long mask = cpus_addr(physid_mask)[0]; | |
903 | ||
904 | ||
905 | if (mask & ~physids_coerce(phys_cpu_present_map)) | |
906 | BUG(); | |
907 | if (ipi_num >= NR_IPIS) | |
908 | BUG(); | |
909 | ||
910 | mask <<= IPI_SHIFT; | |
911 | ipilock = &ipi_lock[ipi_num]; | |
912 | ipicr_addr = (volatile unsigned long *)(M32R_ICU_IPICR_ADDR | |
913 | + (ipi_num << 2)); | |
914 | my_physid_mask = ~(1 << smp_processor_id()); | |
915 | ||
916 | /* | |
917 | * lock ipi_lock[i] | |
918 | * check IPICRi == 0 | |
919 | * write IPICRi (send IPIi) | |
920 | * unlock ipi_lock[i] | |
921 | */ | |
fb1c8f93 | 922 | spin_lock(ipilock); |
1da177e4 | 923 | __asm__ __volatile__ ( |
fb1c8f93 | 924 | ";; CHECK IPICRi == 0 \n\t" |
1da177e4 LT |
925 | ".fillinsn \n" |
926 | "1: \n\t" | |
fb1c8f93 IM |
927 | "ld %0, @%1 \n\t" |
928 | "and %0, %4 \n\t" | |
929 | "beqz %0, 2f \n\t" | |
930 | "bnez %3, 3f \n\t" | |
1da177e4 | 931 | "bra 1b \n\t" |
1da177e4 LT |
932 | ";; WRITE IPICRi (send IPIi) \n\t" |
933 | ".fillinsn \n" | |
fb1c8f93 IM |
934 | "2: \n\t" |
935 | "st %2, @%1 \n\t" | |
1da177e4 | 936 | ".fillinsn \n" |
fb1c8f93 | 937 | "3: \n\t" |
1da177e4 | 938 | : "=&r"(ipicr_val) |
fb1c8f93 IM |
939 | : "r"(ipicr_addr), "r"(mask), "r"(try), "r"(my_physid_mask) |
940 | : "memory" | |
1da177e4 | 941 | ); |
fb1c8f93 | 942 | spin_unlock(ipilock); |
1da177e4 LT |
943 | |
944 | return ipicr_val; | |
945 | } |