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1da177e4 LT |
1 | /* |
2 | ** SMP Support | |
3 | ** | |
4 | ** Copyright (C) 1999 Walt Drummond <drummond@valinux.com> | |
5 | ** Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com> | |
6 | ** Copyright (C) 2001,2004 Grant Grundler <grundler@parisc-linux.org> | |
7 | ** | |
8 | ** Lots of stuff stolen from arch/alpha/kernel/smp.c | |
9 | ** ...and then parisc stole from arch/ia64/kernel/smp.c. Thanks David! :^) | |
10 | ** | |
11 | ** Thanks to John Curry and Ullas Ponnadi. I learned alot from their work. | |
12 | ** -grant (1/12/2001) | |
13 | ** | |
14 | ** This program is free software; you can redistribute it and/or modify | |
15 | ** it under the terms of the GNU General Public License as published by | |
16 | ** the Free Software Foundation; either version 2 of the License, or | |
17 | ** (at your option) any later version. | |
18 | */ | |
19 | #undef ENTRY_SYS_CPUS /* syscall support for iCOD-like functionality */ | |
20 | ||
21 | #include <linux/autoconf.h> | |
22 | ||
23 | #include <linux/types.h> | |
24 | #include <linux/spinlock.h> | |
25 | #include <linux/slab.h> | |
26 | ||
27 | #include <linux/kernel.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/sched.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/interrupt.h> | |
32 | #include <linux/smp.h> | |
33 | #include <linux/kernel_stat.h> | |
34 | #include <linux/mm.h> | |
35 | #include <linux/delay.h> | |
36 | #include <linux/bitops.h> | |
37 | ||
38 | #include <asm/system.h> | |
39 | #include <asm/atomic.h> | |
40 | #include <asm/current.h> | |
41 | #include <asm/delay.h> | |
42 | #include <asm/pgalloc.h> /* for flush_tlb_all() proto/macro */ | |
43 | ||
44 | #include <asm/io.h> | |
45 | #include <asm/irq.h> /* for CPU_IRQ_REGION and friends */ | |
46 | #include <asm/mmu_context.h> | |
47 | #include <asm/page.h> | |
48 | #include <asm/pgtable.h> | |
49 | #include <asm/pgalloc.h> | |
50 | #include <asm/processor.h> | |
51 | #include <asm/ptrace.h> | |
52 | #include <asm/unistd.h> | |
53 | #include <asm/cacheflush.h> | |
54 | ||
55 | #define kDEBUG 0 | |
56 | ||
57 | DEFINE_SPINLOCK(smp_lock); | |
58 | ||
59 | volatile struct task_struct *smp_init_current_idle_task; | |
60 | ||
61 | static volatile int cpu_now_booting = 0; /* track which CPU is booting */ | |
62 | ||
63 | static int parisc_max_cpus = 1; | |
64 | ||
65 | /* online cpus are ones that we've managed to bring up completely | |
66 | * possible cpus are all valid cpu | |
67 | * present cpus are all detected cpu | |
68 | * | |
69 | * On startup we bring up the "possible" cpus. Since we discover | |
70 | * CPUs later, we add them as hotplug, so the possible cpu mask is | |
71 | * empty in the beginning. | |
72 | */ | |
73 | ||
74 | cpumask_t cpu_online_map = CPU_MASK_NONE; /* Bitmap of online CPUs */ | |
75 | cpumask_t cpu_possible_map = CPU_MASK_ALL; /* Bitmap of Present CPUs */ | |
76 | ||
77 | EXPORT_SYMBOL(cpu_online_map); | |
78 | EXPORT_SYMBOL(cpu_possible_map); | |
79 | ||
80 | ||
81 | struct smp_call_struct { | |
82 | void (*func) (void *info); | |
83 | void *info; | |
84 | long wait; | |
85 | atomic_t unstarted_count; | |
86 | atomic_t unfinished_count; | |
87 | }; | |
88 | static volatile struct smp_call_struct *smp_call_function_data; | |
89 | ||
90 | enum ipi_message_type { | |
91 | IPI_NOP=0, | |
92 | IPI_RESCHEDULE=1, | |
93 | IPI_CALL_FUNC, | |
94 | IPI_CPU_START, | |
95 | IPI_CPU_STOP, | |
96 | IPI_CPU_TEST | |
97 | }; | |
98 | ||
99 | ||
100 | /********** SMP inter processor interrupt and communication routines */ | |
101 | ||
102 | #undef PER_CPU_IRQ_REGION | |
103 | #ifdef PER_CPU_IRQ_REGION | |
104 | /* XXX REVISIT Ignore for now. | |
105 | ** *May* need this "hook" to register IPI handler | |
106 | ** once we have perCPU ExtIntr switch tables. | |
107 | */ | |
108 | static void | |
109 | ipi_init(int cpuid) | |
110 | { | |
111 | ||
112 | /* If CPU is present ... */ | |
113 | #ifdef ENTRY_SYS_CPUS | |
114 | /* *and* running (not stopped) ... */ | |
115 | #error iCOD support wants state checked here. | |
116 | #endif | |
117 | ||
118 | #error verify IRQ_OFFSET(IPI_IRQ) is ipi_interrupt() in new IRQ region | |
119 | ||
120 | if(cpu_online(cpuid) ) | |
121 | { | |
122 | switch_to_idle_task(current); | |
123 | } | |
124 | ||
125 | return; | |
126 | } | |
127 | #endif | |
128 | ||
129 | ||
130 | /* | |
131 | ** Yoink this CPU from the runnable list... | |
132 | ** | |
133 | */ | |
134 | static void | |
135 | halt_processor(void) | |
136 | { | |
137 | #ifdef ENTRY_SYS_CPUS | |
138 | #error halt_processor() needs rework | |
139 | /* | |
140 | ** o migrate I/O interrupts off this CPU. | |
141 | ** o leave IPI enabled - __cli() will disable IPI. | |
142 | ** o leave CPU in online map - just change the state | |
143 | */ | |
144 | cpu_data[this_cpu].state = STATE_STOPPED; | |
145 | mark_bh(IPI_BH); | |
146 | #else | |
147 | /* REVISIT : redirect I/O Interrupts to another CPU? */ | |
148 | /* REVISIT : does PM *know* this CPU isn't available? */ | |
149 | cpu_clear(smp_processor_id(), cpu_online_map); | |
150 | local_irq_disable(); | |
151 | for (;;) | |
152 | ; | |
153 | #endif | |
154 | } | |
155 | ||
156 | ||
157 | irqreturn_t | |
158 | ipi_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
159 | { | |
160 | int this_cpu = smp_processor_id(); | |
161 | struct cpuinfo_parisc *p = &cpu_data[this_cpu]; | |
162 | unsigned long ops; | |
163 | unsigned long flags; | |
164 | ||
165 | /* Count this now; we may make a call that never returns. */ | |
166 | p->ipi_count++; | |
167 | ||
168 | mb(); /* Order interrupt and bit testing. */ | |
169 | ||
170 | for (;;) { | |
171 | spin_lock_irqsave(&(p->lock),flags); | |
172 | ops = p->pending_ipi; | |
173 | p->pending_ipi = 0; | |
174 | spin_unlock_irqrestore(&(p->lock),flags); | |
175 | ||
176 | mb(); /* Order bit clearing and data access. */ | |
177 | ||
178 | if (!ops) | |
179 | break; | |
180 | ||
181 | while (ops) { | |
182 | unsigned long which = ffz(~ops); | |
183 | ||
184 | switch (which) { | |
185 | case IPI_RESCHEDULE: | |
186 | #if (kDEBUG>=100) | |
187 | printk(KERN_DEBUG "CPU%d IPI_RESCHEDULE\n",this_cpu); | |
188 | #endif /* kDEBUG */ | |
189 | ops &= ~(1 << IPI_RESCHEDULE); | |
190 | /* | |
191 | * Reschedule callback. Everything to be | |
192 | * done is done by the interrupt return path. | |
193 | */ | |
194 | break; | |
195 | ||
196 | case IPI_CALL_FUNC: | |
197 | #if (kDEBUG>=100) | |
198 | printk(KERN_DEBUG "CPU%d IPI_CALL_FUNC\n",this_cpu); | |
199 | #endif /* kDEBUG */ | |
200 | ops &= ~(1 << IPI_CALL_FUNC); | |
201 | { | |
202 | volatile struct smp_call_struct *data; | |
203 | void (*func)(void *info); | |
204 | void *info; | |
205 | int wait; | |
206 | ||
207 | data = smp_call_function_data; | |
208 | func = data->func; | |
209 | info = data->info; | |
210 | wait = data->wait; | |
211 | ||
212 | mb(); | |
213 | atomic_dec ((atomic_t *)&data->unstarted_count); | |
214 | ||
215 | /* At this point, *data can't | |
216 | * be relied upon. | |
217 | */ | |
218 | ||
219 | (*func)(info); | |
220 | ||
221 | /* Notify the sending CPU that the | |
222 | * task is done. | |
223 | */ | |
224 | mb(); | |
225 | if (wait) | |
226 | atomic_dec ((atomic_t *)&data->unfinished_count); | |
227 | } | |
228 | break; | |
229 | ||
230 | case IPI_CPU_START: | |
231 | #if (kDEBUG>=100) | |
232 | printk(KERN_DEBUG "CPU%d IPI_CPU_START\n",this_cpu); | |
233 | #endif /* kDEBUG */ | |
234 | ops &= ~(1 << IPI_CPU_START); | |
235 | #ifdef ENTRY_SYS_CPUS | |
236 | p->state = STATE_RUNNING; | |
237 | #endif | |
238 | break; | |
239 | ||
240 | case IPI_CPU_STOP: | |
241 | #if (kDEBUG>=100) | |
242 | printk(KERN_DEBUG "CPU%d IPI_CPU_STOP\n",this_cpu); | |
243 | #endif /* kDEBUG */ | |
244 | ops &= ~(1 << IPI_CPU_STOP); | |
245 | #ifdef ENTRY_SYS_CPUS | |
246 | #else | |
247 | halt_processor(); | |
248 | #endif | |
249 | break; | |
250 | ||
251 | case IPI_CPU_TEST: | |
252 | #if (kDEBUG>=100) | |
253 | printk(KERN_DEBUG "CPU%d is alive!\n",this_cpu); | |
254 | #endif /* kDEBUG */ | |
255 | ops &= ~(1 << IPI_CPU_TEST); | |
256 | break; | |
257 | ||
258 | default: | |
259 | printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n", | |
260 | this_cpu, which); | |
261 | ops &= ~(1 << which); | |
262 | return IRQ_NONE; | |
263 | } /* Switch */ | |
264 | } /* while (ops) */ | |
265 | } | |
266 | return IRQ_HANDLED; | |
267 | } | |
268 | ||
269 | ||
270 | static inline void | |
271 | ipi_send(int cpu, enum ipi_message_type op) | |
272 | { | |
273 | struct cpuinfo_parisc *p = &cpu_data[cpu]; | |
274 | unsigned long flags; | |
275 | ||
276 | spin_lock_irqsave(&(p->lock),flags); | |
277 | p->pending_ipi |= 1 << op; | |
278 | gsc_writel(IPI_IRQ - CPU_IRQ_BASE, cpu_data[cpu].hpa); | |
279 | spin_unlock_irqrestore(&(p->lock),flags); | |
280 | } | |
281 | ||
282 | ||
283 | static inline void | |
284 | send_IPI_single(int dest_cpu, enum ipi_message_type op) | |
285 | { | |
286 | if (dest_cpu == NO_PROC_ID) { | |
287 | BUG(); | |
288 | return; | |
289 | } | |
290 | ||
291 | ipi_send(dest_cpu, op); | |
292 | } | |
293 | ||
294 | static inline void | |
295 | send_IPI_allbutself(enum ipi_message_type op) | |
296 | { | |
297 | int i; | |
298 | ||
299 | for (i = 0; i < NR_CPUS; i++) { | |
300 | if (cpu_online(i) && i != smp_processor_id()) | |
301 | send_IPI_single(i, op); | |
302 | } | |
303 | } | |
304 | ||
305 | ||
306 | inline void | |
307 | smp_send_stop(void) { send_IPI_allbutself(IPI_CPU_STOP); } | |
308 | ||
309 | static inline void | |
310 | smp_send_start(void) { send_IPI_allbutself(IPI_CPU_START); } | |
311 | ||
312 | void | |
313 | smp_send_reschedule(int cpu) { send_IPI_single(cpu, IPI_RESCHEDULE); } | |
314 | ||
315 | ||
316 | /** | |
317 | * Run a function on all other CPUs. | |
318 | * <func> The function to run. This must be fast and non-blocking. | |
319 | * <info> An arbitrary pointer to pass to the function. | |
320 | * <retry> If true, keep retrying until ready. | |
321 | * <wait> If true, wait until function has completed on other CPUs. | |
322 | * [RETURNS] 0 on success, else a negative status code. | |
323 | * | |
324 | * Does not return until remote CPUs are nearly ready to execute <func> | |
325 | * or have executed. | |
326 | */ | |
327 | ||
328 | int | |
329 | smp_call_function (void (*func) (void *info), void *info, int retry, int wait) | |
330 | { | |
331 | struct smp_call_struct data; | |
332 | unsigned long timeout; | |
333 | static DEFINE_SPINLOCK(lock); | |
334 | int retries = 0; | |
335 | ||
336 | if (num_online_cpus() < 2) | |
337 | return 0; | |
338 | ||
339 | /* Can deadlock when called with interrupts disabled */ | |
340 | WARN_ON(irqs_disabled()); | |
341 | ||
342 | data.func = func; | |
343 | data.info = info; | |
344 | data.wait = wait; | |
345 | atomic_set(&data.unstarted_count, num_online_cpus() - 1); | |
346 | atomic_set(&data.unfinished_count, num_online_cpus() - 1); | |
347 | ||
348 | if (retry) { | |
349 | spin_lock (&lock); | |
350 | while (smp_call_function_data != 0) | |
351 | barrier(); | |
352 | } | |
353 | else { | |
354 | spin_lock (&lock); | |
355 | if (smp_call_function_data) { | |
356 | spin_unlock (&lock); | |
357 | return -EBUSY; | |
358 | } | |
359 | } | |
360 | ||
361 | smp_call_function_data = &data; | |
362 | spin_unlock (&lock); | |
363 | ||
364 | /* Send a message to all other CPUs and wait for them to respond */ | |
365 | send_IPI_allbutself(IPI_CALL_FUNC); | |
366 | ||
367 | retry: | |
368 | /* Wait for response */ | |
369 | timeout = jiffies + HZ; | |
370 | while ( (atomic_read (&data.unstarted_count) > 0) && | |
371 | time_before (jiffies, timeout) ) | |
372 | barrier (); | |
373 | ||
374 | if (atomic_read (&data.unstarted_count) > 0) { | |
375 | printk(KERN_CRIT "SMP CALL FUNCTION TIMED OUT! (cpu=%d), try %d\n", | |
376 | smp_processor_id(), ++retries); | |
377 | goto retry; | |
378 | } | |
379 | /* We either got one or timed out. Release the lock */ | |
380 | ||
381 | mb(); | |
382 | smp_call_function_data = NULL; | |
383 | ||
384 | while (wait && atomic_read (&data.unfinished_count) > 0) | |
385 | barrier (); | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
390 | EXPORT_SYMBOL(smp_call_function); | |
391 | ||
392 | /* | |
393 | * Flush all other CPU's tlb and then mine. Do this with on_each_cpu() | |
394 | * as we want to ensure all TLB's flushed before proceeding. | |
395 | */ | |
396 | ||
397 | extern void flush_tlb_all_local(void); | |
398 | ||
399 | void | |
400 | smp_flush_tlb_all(void) | |
401 | { | |
402 | on_each_cpu((void (*)(void *))flush_tlb_all_local, NULL, 1, 1); | |
403 | } | |
404 | ||
405 | ||
406 | void | |
407 | smp_do_timer(struct pt_regs *regs) | |
408 | { | |
409 | int cpu = smp_processor_id(); | |
410 | struct cpuinfo_parisc *data = &cpu_data[cpu]; | |
411 | ||
412 | if (!--data->prof_counter) { | |
413 | data->prof_counter = data->prof_multiplier; | |
414 | update_process_times(user_mode(regs)); | |
415 | } | |
416 | } | |
417 | ||
418 | /* | |
419 | * Called by secondaries to update state and initialize CPU registers. | |
420 | */ | |
421 | static void __init | |
422 | smp_cpu_init(int cpunum) | |
423 | { | |
424 | extern int init_per_cpu(int); /* arch/parisc/kernel/setup.c */ | |
425 | extern void init_IRQ(void); /* arch/parisc/kernel/irq.c */ | |
426 | ||
427 | /* Set modes and Enable floating point coprocessor */ | |
428 | (void) init_per_cpu(cpunum); | |
429 | ||
430 | disable_sr_hashing(); | |
431 | ||
432 | mb(); | |
433 | ||
434 | /* Well, support 2.4 linux scheme as well. */ | |
435 | if (cpu_test_and_set(cpunum, cpu_online_map)) | |
436 | { | |
437 | extern void machine_halt(void); /* arch/parisc.../process.c */ | |
438 | ||
439 | printk(KERN_CRIT "CPU#%d already initialized!\n", cpunum); | |
440 | machine_halt(); | |
441 | } | |
442 | ||
443 | /* Initialise the idle task for this CPU */ | |
444 | atomic_inc(&init_mm.mm_count); | |
445 | current->active_mm = &init_mm; | |
446 | if(current->mm) | |
447 | BUG(); | |
448 | enter_lazy_tlb(&init_mm, current); | |
449 | ||
450 | init_IRQ(); /* make sure no IRQ's are enabled or pending */ | |
451 | } | |
452 | ||
453 | ||
454 | /* | |
455 | * Slaves start using C here. Indirectly called from smp_slave_stext. | |
456 | * Do what start_kernel() and main() do for boot strap processor (aka monarch) | |
457 | */ | |
458 | void __init smp_callin(void) | |
459 | { | |
460 | int slave_id = cpu_now_booting; | |
461 | #if 0 | |
462 | void *istack; | |
463 | #endif | |
464 | ||
465 | smp_cpu_init(slave_id); | |
466 | ||
467 | #if 0 /* NOT WORKING YET - see entry.S */ | |
468 | istack = (void *)__get_free_pages(GFP_KERNEL,ISTACK_ORDER); | |
469 | if (istack == NULL) { | |
470 | printk(KERN_CRIT "Failed to allocate interrupt stack for cpu %d\n",slave_id); | |
471 | BUG(); | |
472 | } | |
473 | mtctl(istack,31); | |
474 | #endif | |
475 | ||
476 | flush_cache_all_local(); /* start with known state */ | |
477 | flush_tlb_all_local(); | |
478 | ||
479 | local_irq_enable(); /* Interrupts have been off until now */ | |
480 | ||
481 | cpu_idle(); /* Wait for timer to schedule some work */ | |
482 | ||
483 | /* NOTREACHED */ | |
484 | panic("smp_callin() AAAAaaaaahhhh....\n"); | |
485 | } | |
486 | ||
487 | /* | |
488 | * Bring one cpu online. | |
489 | */ | |
490 | int __init smp_boot_one_cpu(int cpuid) | |
491 | { | |
492 | struct task_struct *idle; | |
493 | long timeout; | |
494 | ||
495 | /* | |
496 | * Create an idle task for this CPU. Note the address wed* give | |
497 | * to kernel_thread is irrelevant -- it's going to start | |
498 | * where OS_BOOT_RENDEVZ vector in SAL says to start. But | |
499 | * this gets all the other task-y sort of data structures set | |
500 | * up like we wish. We need to pull the just created idle task | |
501 | * off the run queue and stuff it into the init_tasks[] array. | |
502 | * Sheesh . . . | |
503 | */ | |
504 | ||
505 | idle = fork_idle(cpuid); | |
506 | if (IS_ERR(idle)) | |
507 | panic("SMP: fork failed for CPU:%d", cpuid); | |
508 | ||
509 | idle->thread_info->cpu = cpuid; | |
510 | ||
511 | /* Let _start know what logical CPU we're booting | |
512 | ** (offset into init_tasks[],cpu_data[]) | |
513 | */ | |
514 | cpu_now_booting = cpuid; | |
515 | ||
516 | /* | |
517 | ** boot strap code needs to know the task address since | |
518 | ** it also contains the process stack. | |
519 | */ | |
520 | smp_init_current_idle_task = idle ; | |
521 | mb(); | |
522 | ||
523 | printk("Releasing cpu %d now, hpa=%lx\n", cpuid, cpu_data[cpuid].hpa); | |
524 | ||
525 | /* | |
526 | ** This gets PDC to release the CPU from a very tight loop. | |
527 | ** | |
528 | ** From the PA-RISC 2.0 Firmware Architecture Reference Specification: | |
529 | ** "The MEM_RENDEZ vector specifies the location of OS_RENDEZ which | |
530 | ** is executed after receiving the rendezvous signal (an interrupt to | |
531 | ** EIR{0}). MEM_RENDEZ is valid only when it is nonzero and the | |
532 | ** contents of memory are valid." | |
533 | */ | |
534 | gsc_writel(TIMER_IRQ - CPU_IRQ_BASE, cpu_data[cpuid].hpa); | |
535 | mb(); | |
536 | ||
537 | /* | |
538 | * OK, wait a bit for that CPU to finish staggering about. | |
539 | * Slave will set a bit when it reaches smp_cpu_init(). | |
540 | * Once the "monarch CPU" sees the bit change, it can move on. | |
541 | */ | |
542 | for (timeout = 0; timeout < 10000; timeout++) { | |
543 | if(cpu_online(cpuid)) { | |
544 | /* Which implies Slave has started up */ | |
545 | cpu_now_booting = 0; | |
546 | smp_init_current_idle_task = NULL; | |
547 | goto alive ; | |
548 | } | |
549 | udelay(100); | |
550 | barrier(); | |
551 | } | |
552 | ||
553 | put_task_struct(idle); | |
554 | idle = NULL; | |
555 | ||
556 | printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid); | |
557 | return -1; | |
558 | ||
559 | alive: | |
560 | /* Remember the Slave data */ | |
561 | #if (kDEBUG>=100) | |
562 | printk(KERN_DEBUG "SMP: CPU:%d came alive after %ld _us\n", | |
563 | cpuid, timeout * 100); | |
564 | #endif /* kDEBUG */ | |
565 | #ifdef ENTRY_SYS_CPUS | |
566 | cpu_data[cpuid].state = STATE_RUNNING; | |
567 | #endif | |
568 | return 0; | |
569 | } | |
570 | ||
571 | void __devinit smp_prepare_boot_cpu(void) | |
572 | { | |
573 | int bootstrap_processor=cpu_data[0].cpuid; /* CPU ID of BSP */ | |
574 | ||
575 | #ifdef ENTRY_SYS_CPUS | |
576 | cpu_data[0].state = STATE_RUNNING; | |
577 | #endif | |
578 | ||
579 | /* Setup BSP mappings */ | |
580 | printk("SMP: bootstrap CPU ID is %d\n",bootstrap_processor); | |
581 | ||
582 | cpu_set(bootstrap_processor, cpu_online_map); | |
583 | cpu_set(bootstrap_processor, cpu_present_map); | |
584 | } | |
585 | ||
586 | ||
587 | ||
588 | /* | |
589 | ** inventory.c:do_inventory() hasn't yet been run and thus we | |
590 | ** don't 'discover' the additional CPU's until later. | |
591 | */ | |
592 | void __init smp_prepare_cpus(unsigned int max_cpus) | |
593 | { | |
594 | cpus_clear(cpu_present_map); | |
595 | cpu_set(0, cpu_present_map); | |
596 | ||
597 | parisc_max_cpus = max_cpus; | |
598 | if (!max_cpus) | |
599 | printk(KERN_INFO "SMP mode deactivated.\n"); | |
600 | } | |
601 | ||
602 | ||
603 | void smp_cpus_done(unsigned int cpu_max) | |
604 | { | |
605 | return; | |
606 | } | |
607 | ||
608 | ||
609 | int __devinit __cpu_up(unsigned int cpu) | |
610 | { | |
611 | if (cpu != 0 && cpu < parisc_max_cpus) | |
612 | smp_boot_one_cpu(cpu); | |
613 | ||
614 | return cpu_online(cpu) ? 0 : -ENOSYS; | |
615 | } | |
616 | ||
617 | ||
618 | ||
619 | #ifdef ENTRY_SYS_CPUS | |
620 | /* Code goes along with: | |
621 | ** entry.s: ENTRY_NAME(sys_cpus) / * 215, for cpu stat * / | |
622 | */ | |
623 | int sys_cpus(int argc, char **argv) | |
624 | { | |
625 | int i,j=0; | |
626 | extern int current_pid(int cpu); | |
627 | ||
628 | if( argc > 2 ) { | |
629 | printk("sys_cpus:Only one argument supported\n"); | |
630 | return (-1); | |
631 | } | |
632 | if ( argc == 1 ){ | |
633 | ||
634 | #ifdef DUMP_MORE_STATE | |
635 | for(i=0; i<NR_CPUS; i++) { | |
636 | int cpus_per_line = 4; | |
637 | if(cpu_online(i)) { | |
638 | if (j++ % cpus_per_line) | |
639 | printk(" %3d",i); | |
640 | else | |
641 | printk("\n %3d",i); | |
642 | } | |
643 | } | |
644 | printk("\n"); | |
645 | #else | |
646 | printk("\n 0\n"); | |
647 | #endif | |
648 | } else if((argc==2) && !(strcmp(argv[1],"-l"))) { | |
649 | printk("\nCPUSTATE TASK CPUNUM CPUID HARDCPU(HPA)\n"); | |
650 | #ifdef DUMP_MORE_STATE | |
651 | for(i=0;i<NR_CPUS;i++) { | |
652 | if (!cpu_online(i)) | |
653 | continue; | |
654 | if (cpu_data[i].cpuid != NO_PROC_ID) { | |
655 | switch(cpu_data[i].state) { | |
656 | case STATE_RENDEZVOUS: | |
657 | printk("RENDEZVS "); | |
658 | break; | |
659 | case STATE_RUNNING: | |
660 | printk((current_pid(i)!=0) ? "RUNNING " : "IDLING "); | |
661 | break; | |
662 | case STATE_STOPPED: | |
663 | printk("STOPPED "); | |
664 | break; | |
665 | case STATE_HALTED: | |
666 | printk("HALTED "); | |
667 | break; | |
668 | default: | |
669 | printk("%08x?", cpu_data[i].state); | |
670 | break; | |
671 | } | |
672 | if(cpu_online(i)) { | |
673 | printk(" %4d",current_pid(i)); | |
674 | } | |
675 | printk(" %6d",cpu_number_map(i)); | |
676 | printk(" %5d",i); | |
677 | printk(" 0x%lx\n",cpu_data[i].hpa); | |
678 | } | |
679 | } | |
680 | #else | |
681 | printk("\n%s %4d 0 0 --------", | |
682 | (current->pid)?"RUNNING ": "IDLING ",current->pid); | |
683 | #endif | |
684 | } else if ((argc==2) && !(strcmp(argv[1],"-s"))) { | |
685 | #ifdef DUMP_MORE_STATE | |
686 | printk("\nCPUSTATE CPUID\n"); | |
687 | for (i=0;i<NR_CPUS;i++) { | |
688 | if (!cpu_online(i)) | |
689 | continue; | |
690 | if (cpu_data[i].cpuid != NO_PROC_ID) { | |
691 | switch(cpu_data[i].state) { | |
692 | case STATE_RENDEZVOUS: | |
693 | printk("RENDEZVS");break; | |
694 | case STATE_RUNNING: | |
695 | printk((current_pid(i)!=0) ? "RUNNING " : "IDLING"); | |
696 | break; | |
697 | case STATE_STOPPED: | |
698 | printk("STOPPED ");break; | |
699 | case STATE_HALTED: | |
700 | printk("HALTED ");break; | |
701 | default: | |
702 | } | |
703 | printk(" %5d\n",i); | |
704 | } | |
705 | } | |
706 | #else | |
707 | printk("\n%s CPU0",(current->pid==0)?"RUNNING ":"IDLING "); | |
708 | #endif | |
709 | } else { | |
710 | printk("sys_cpus:Unknown request\n"); | |
711 | return (-1); | |
712 | } | |
713 | return 0; | |
714 | } | |
715 | #endif /* ENTRY_SYS_CPUS */ | |
716 | ||
717 | #ifdef CONFIG_PROC_FS | |
718 | int __init | |
719 | setup_profiling_timer(unsigned int multiplier) | |
720 | { | |
721 | return -EINVAL; | |
722 | } | |
723 | #endif |