Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * SMP support for ppc. | |
3 | * | |
4 | * Written by Cort Dougan (cort@cs.nmt.edu) borrowing a great | |
5 | * deal of code from the sparc and intel versions. | |
6 | * | |
7 | * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu> | |
8 | * | |
9 | * PowerPC-64 Support added by Dave Engebretsen, Peter Bergner, and | |
10 | * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License | |
14 | * as published by the Free Software Foundation; either version | |
15 | * 2 of the License, or (at your option) any later version. | |
16 | */ | |
17 | ||
18 | #undef DEBUG | |
19 | ||
1da177e4 LT |
20 | #include <linux/kernel.h> |
21 | #include <linux/module.h> | |
22 | #include <linux/sched.h> | |
23 | #include <linux/smp.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/delay.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/spinlock.h> | |
28 | #include <linux/cache.h> | |
29 | #include <linux/err.h> | |
30 | #include <linux/sysdev.h> | |
31 | #include <linux/cpu.h> | |
32 | #include <linux/notifier.h> | |
4b703a23 | 33 | #include <linux/topology.h> |
1da177e4 LT |
34 | |
35 | #include <asm/ptrace.h> | |
60063497 | 36 | #include <linux/atomic.h> |
1da177e4 LT |
37 | #include <asm/irq.h> |
38 | #include <asm/page.h> | |
39 | #include <asm/pgtable.h> | |
40 | #include <asm/prom.h> | |
41 | #include <asm/smp.h> | |
1da177e4 LT |
42 | #include <asm/time.h> |
43 | #include <asm/machdep.h> | |
e2075f79 | 44 | #include <asm/cputhreads.h> |
1da177e4 LT |
45 | #include <asm/cputable.h> |
46 | #include <asm/system.h> | |
bbeb3f4c | 47 | #include <asm/mpic.h> |
a7f290da | 48 | #include <asm/vdso_datapage.h> |
5ad57078 PM |
49 | #ifdef CONFIG_PPC64 |
50 | #include <asm/paca.h> | |
51 | #endif | |
52 | ||
1da177e4 | 53 | #ifdef DEBUG |
f9e4ec57 | 54 | #include <asm/udbg.h> |
1da177e4 LT |
55 | #define DBG(fmt...) udbg_printf(fmt) |
56 | #else | |
57 | #define DBG(fmt...) | |
58 | #endif | |
59 | ||
c56e5853 BH |
60 | |
61 | /* Store all idle threads, this can be reused instead of creating | |
62 | * a new thread. Also avoids complicated thread destroy functionality | |
63 | * for idle threads. | |
64 | */ | |
65 | #ifdef CONFIG_HOTPLUG_CPU | |
66 | /* | |
67 | * Needed only for CONFIG_HOTPLUG_CPU because __cpuinitdata is | |
68 | * removed after init for !CONFIG_HOTPLUG_CPU. | |
69 | */ | |
70 | static DEFINE_PER_CPU(struct task_struct *, idle_thread_array); | |
71 | #define get_idle_for_cpu(x) (per_cpu(idle_thread_array, x)) | |
72 | #define set_idle_for_cpu(x, p) (per_cpu(idle_thread_array, x) = (p)) | |
73 | #else | |
74 | static struct task_struct *idle_thread_array[NR_CPUS] __cpuinitdata ; | |
75 | #define get_idle_for_cpu(x) (idle_thread_array[(x)]) | |
76 | #define set_idle_for_cpu(x, p) (idle_thread_array[(x)] = (p)) | |
77 | #endif | |
78 | ||
f9e4ec57 ME |
79 | struct thread_info *secondary_ti; |
80 | ||
cc1ba8ea AB |
81 | DEFINE_PER_CPU(cpumask_var_t, cpu_sibling_map); |
82 | DEFINE_PER_CPU(cpumask_var_t, cpu_core_map); | |
1da177e4 | 83 | |
d5a7430d | 84 | EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); |
440a0857 | 85 | EXPORT_PER_CPU_SYMBOL(cpu_core_map); |
1da177e4 | 86 | |
5ad57078 | 87 | /* SMP operations for this machine */ |
1da177e4 LT |
88 | struct smp_ops_t *smp_ops; |
89 | ||
7ccbe504 BH |
90 | /* Can't be static due to PowerMac hackery */ |
91 | volatile unsigned int cpu_callin_map[NR_CPUS]; | |
1da177e4 | 92 | |
1da177e4 LT |
93 | int smt_enabled_at_boot = 1; |
94 | ||
cc532915 ME |
95 | static void (*crash_ipi_function_ptr)(struct pt_regs *) = NULL; |
96 | ||
5ad57078 | 97 | #ifdef CONFIG_PPC64 |
de300974 | 98 | int __devinit smp_generic_kick_cpu(int nr) |
1da177e4 LT |
99 | { |
100 | BUG_ON(nr < 0 || nr >= NR_CPUS); | |
101 | ||
102 | /* | |
103 | * The processor is currently spinning, waiting for the | |
104 | * cpu_start field to become non-zero After we set cpu_start, | |
105 | * the processor will continue on to secondary_start | |
106 | */ | |
107 | paca[nr].cpu_start = 1; | |
0d8d4d42 | 108 | smp_mb(); |
de300974 ME |
109 | |
110 | return 0; | |
1da177e4 | 111 | } |
5ad57078 | 112 | #endif |
1da177e4 | 113 | |
25ddd738 MM |
114 | static irqreturn_t call_function_action(int irq, void *data) |
115 | { | |
116 | generic_smp_call_function_interrupt(); | |
117 | return IRQ_HANDLED; | |
118 | } | |
119 | ||
120 | static irqreturn_t reschedule_action(int irq, void *data) | |
121 | { | |
184748cc | 122 | scheduler_ipi(); |
25ddd738 MM |
123 | return IRQ_HANDLED; |
124 | } | |
125 | ||
126 | static irqreturn_t call_function_single_action(int irq, void *data) | |
127 | { | |
128 | generic_smp_call_function_single_interrupt(); | |
129 | return IRQ_HANDLED; | |
130 | } | |
131 | ||
7ef71d75 | 132 | static irqreturn_t debug_ipi_action(int irq, void *data) |
25ddd738 | 133 | { |
23d72bfd MM |
134 | if (crash_ipi_function_ptr) { |
135 | crash_ipi_function_ptr(get_irq_regs()); | |
136 | return IRQ_HANDLED; | |
137 | } | |
138 | ||
139 | #ifdef CONFIG_DEBUGGER | |
140 | debugger_ipi(get_irq_regs()); | |
141 | #endif /* CONFIG_DEBUGGER */ | |
142 | ||
25ddd738 MM |
143 | return IRQ_HANDLED; |
144 | } | |
145 | ||
146 | static irq_handler_t smp_ipi_action[] = { | |
147 | [PPC_MSG_CALL_FUNCTION] = call_function_action, | |
148 | [PPC_MSG_RESCHEDULE] = reschedule_action, | |
149 | [PPC_MSG_CALL_FUNC_SINGLE] = call_function_single_action, | |
150 | [PPC_MSG_DEBUGGER_BREAK] = debug_ipi_action, | |
151 | }; | |
152 | ||
153 | const char *smp_ipi_name[] = { | |
154 | [PPC_MSG_CALL_FUNCTION] = "ipi call function", | |
155 | [PPC_MSG_RESCHEDULE] = "ipi reschedule", | |
156 | [PPC_MSG_CALL_FUNC_SINGLE] = "ipi call function single", | |
157 | [PPC_MSG_DEBUGGER_BREAK] = "ipi debugger", | |
158 | }; | |
159 | ||
160 | /* optional function to request ipi, for controllers with >= 4 ipis */ | |
161 | int smp_request_message_ipi(int virq, int msg) | |
162 | { | |
163 | int err; | |
164 | ||
165 | if (msg < 0 || msg > PPC_MSG_DEBUGGER_BREAK) { | |
166 | return -EINVAL; | |
167 | } | |
168 | #if !defined(CONFIG_DEBUGGER) && !defined(CONFIG_KEXEC) | |
169 | if (msg == PPC_MSG_DEBUGGER_BREAK) { | |
170 | return 1; | |
171 | } | |
172 | #endif | |
173 | err = request_irq(virq, smp_ipi_action[msg], IRQF_DISABLED|IRQF_PERCPU, | |
174 | smp_ipi_name[msg], 0); | |
175 | WARN(err < 0, "unable to request_irq %d for %s (rc %d)\n", | |
176 | virq, smp_ipi_name[msg], err); | |
177 | ||
178 | return err; | |
179 | } | |
180 | ||
1ece355b | 181 | #ifdef CONFIG_PPC_SMP_MUXED_IPI |
23d72bfd | 182 | struct cpu_messages { |
71454272 | 183 | int messages; /* current messages */ |
23d72bfd MM |
184 | unsigned long data; /* data for cause ipi */ |
185 | }; | |
186 | static DEFINE_PER_CPU_SHARED_ALIGNED(struct cpu_messages, ipi_message); | |
187 | ||
188 | void smp_muxed_ipi_set_data(int cpu, unsigned long data) | |
189 | { | |
190 | struct cpu_messages *info = &per_cpu(ipi_message, cpu); | |
191 | ||
192 | info->data = data; | |
193 | } | |
194 | ||
195 | void smp_muxed_ipi_message_pass(int cpu, int msg) | |
196 | { | |
197 | struct cpu_messages *info = &per_cpu(ipi_message, cpu); | |
71454272 | 198 | char *message = (char *)&info->messages; |
23d72bfd | 199 | |
71454272 | 200 | message[msg] = 1; |
23d72bfd MM |
201 | mb(); |
202 | smp_ops->cause_ipi(cpu, info->data); | |
203 | } | |
204 | ||
23d72bfd MM |
205 | irqreturn_t smp_ipi_demux(void) |
206 | { | |
207 | struct cpu_messages *info = &__get_cpu_var(ipi_message); | |
71454272 | 208 | unsigned int all; |
23d72bfd MM |
209 | |
210 | mb(); /* order any irq clear */ | |
71454272 MM |
211 | |
212 | do { | |
213 | all = xchg_local(&info->messages, 0); | |
214 | ||
215 | #ifdef __BIG_ENDIAN | |
216 | if (all & (1 << (24 - 8 * PPC_MSG_CALL_FUNCTION))) | |
23d72bfd | 217 | generic_smp_call_function_interrupt(); |
71454272 | 218 | if (all & (1 << (24 - 8 * PPC_MSG_RESCHEDULE))) |
880102e7 | 219 | scheduler_ipi(); |
71454272 | 220 | if (all & (1 << (24 - 8 * PPC_MSG_CALL_FUNC_SINGLE))) |
23d72bfd | 221 | generic_smp_call_function_single_interrupt(); |
71454272 | 222 | if (all & (1 << (24 - 8 * PPC_MSG_DEBUGGER_BREAK))) |
23d72bfd | 223 | debug_ipi_action(0, NULL); |
71454272 MM |
224 | #else |
225 | #error Unsupported ENDIAN | |
23d72bfd | 226 | #endif |
71454272 MM |
227 | } while (info->messages); |
228 | ||
23d72bfd MM |
229 | return IRQ_HANDLED; |
230 | } | |
1ece355b | 231 | #endif /* CONFIG_PPC_SMP_MUXED_IPI */ |
23d72bfd | 232 | |
9ca980dc PM |
233 | static inline void do_message_pass(int cpu, int msg) |
234 | { | |
235 | if (smp_ops->message_pass) | |
236 | smp_ops->message_pass(cpu, msg); | |
237 | #ifdef CONFIG_PPC_SMP_MUXED_IPI | |
238 | else | |
239 | smp_muxed_ipi_message_pass(cpu, msg); | |
240 | #endif | |
241 | } | |
242 | ||
1da177e4 LT |
243 | void smp_send_reschedule(int cpu) |
244 | { | |
8cffc6ac | 245 | if (likely(smp_ops)) |
9ca980dc | 246 | do_message_pass(cpu, PPC_MSG_RESCHEDULE); |
1da177e4 | 247 | } |
de56a948 | 248 | EXPORT_SYMBOL_GPL(smp_send_reschedule); |
1da177e4 | 249 | |
b7d7a240 JA |
250 | void arch_send_call_function_single_ipi(int cpu) |
251 | { | |
9ca980dc | 252 | do_message_pass(cpu, PPC_MSG_CALL_FUNC_SINGLE); |
b7d7a240 JA |
253 | } |
254 | ||
f063ea02 | 255 | void arch_send_call_function_ipi_mask(const struct cpumask *mask) |
b7d7a240 JA |
256 | { |
257 | unsigned int cpu; | |
258 | ||
f063ea02 | 259 | for_each_cpu(cpu, mask) |
9ca980dc | 260 | do_message_pass(cpu, PPC_MSG_CALL_FUNCTION); |
b7d7a240 JA |
261 | } |
262 | ||
e0476371 MM |
263 | #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC) |
264 | void smp_send_debugger_break(void) | |
1da177e4 | 265 | { |
e0476371 MM |
266 | int cpu; |
267 | int me = raw_smp_processor_id(); | |
268 | ||
269 | if (unlikely(!smp_ops)) | |
270 | return; | |
271 | ||
272 | for_each_online_cpu(cpu) | |
273 | if (cpu != me) | |
9ca980dc | 274 | do_message_pass(cpu, PPC_MSG_DEBUGGER_BREAK); |
1da177e4 LT |
275 | } |
276 | #endif | |
277 | ||
cc532915 ME |
278 | #ifdef CONFIG_KEXEC |
279 | void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *)) | |
280 | { | |
281 | crash_ipi_function_ptr = crash_ipi_callback; | |
e0476371 | 282 | if (crash_ipi_callback) { |
cc532915 | 283 | mb(); |
e0476371 | 284 | smp_send_debugger_break(); |
cc532915 ME |
285 | } |
286 | } | |
287 | #endif | |
288 | ||
1da177e4 LT |
289 | static void stop_this_cpu(void *dummy) |
290 | { | |
8389b37d VB |
291 | /* Remove this CPU */ |
292 | set_cpu_online(smp_processor_id(), false); | |
293 | ||
1da177e4 LT |
294 | local_irq_disable(); |
295 | while (1) | |
296 | ; | |
297 | } | |
298 | ||
8fd7675c SS |
299 | void smp_send_stop(void) |
300 | { | |
8691e5a8 | 301 | smp_call_function(stop_this_cpu, NULL, 0); |
1da177e4 LT |
302 | } |
303 | ||
1da177e4 LT |
304 | struct thread_info *current_set[NR_CPUS]; |
305 | ||
1da177e4 LT |
306 | static void __devinit smp_store_cpu_info(int id) |
307 | { | |
6b7487fc | 308 | per_cpu(cpu_pvr, id) = mfspr(SPRN_PVR); |
3160b097 BB |
309 | #ifdef CONFIG_PPC_FSL_BOOK3E |
310 | per_cpu(next_tlbcam_idx, id) | |
311 | = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1; | |
312 | #endif | |
1da177e4 LT |
313 | } |
314 | ||
1da177e4 LT |
315 | void __init smp_prepare_cpus(unsigned int max_cpus) |
316 | { | |
317 | unsigned int cpu; | |
318 | ||
319 | DBG("smp_prepare_cpus\n"); | |
320 | ||
321 | /* | |
322 | * setup_cpu may need to be called on the boot cpu. We havent | |
323 | * spun any cpus up but lets be paranoid. | |
324 | */ | |
325 | BUG_ON(boot_cpuid != smp_processor_id()); | |
326 | ||
327 | /* Fixup boot cpu */ | |
328 | smp_store_cpu_info(boot_cpuid); | |
329 | cpu_callin_map[boot_cpuid] = 1; | |
330 | ||
cc1ba8ea AB |
331 | for_each_possible_cpu(cpu) { |
332 | zalloc_cpumask_var_node(&per_cpu(cpu_sibling_map, cpu), | |
333 | GFP_KERNEL, cpu_to_node(cpu)); | |
334 | zalloc_cpumask_var_node(&per_cpu(cpu_core_map, cpu), | |
335 | GFP_KERNEL, cpu_to_node(cpu)); | |
336 | } | |
337 | ||
338 | cpumask_set_cpu(boot_cpuid, cpu_sibling_mask(boot_cpuid)); | |
339 | cpumask_set_cpu(boot_cpuid, cpu_core_mask(boot_cpuid)); | |
340 | ||
8cffc6ac | 341 | if (smp_ops) |
757cbd46 KG |
342 | if (smp_ops->probe) |
343 | max_cpus = smp_ops->probe(); | |
344 | else | |
345 | max_cpus = NR_CPUS; | |
8cffc6ac BH |
346 | else |
347 | max_cpus = 1; | |
1da177e4 LT |
348 | } |
349 | ||
350 | void __devinit smp_prepare_boot_cpu(void) | |
351 | { | |
352 | BUG_ON(smp_processor_id() != boot_cpuid); | |
5ad57078 | 353 | #ifdef CONFIG_PPC64 |
1da177e4 | 354 | paca[boot_cpuid].__current = current; |
5ad57078 | 355 | #endif |
b5e2fc1c | 356 | current_set[boot_cpuid] = task_thread_info(current); |
1da177e4 LT |
357 | } |
358 | ||
359 | #ifdef CONFIG_HOTPLUG_CPU | |
360 | /* State of each CPU during hotplug phases */ | |
105765f4 | 361 | static DEFINE_PER_CPU(int, cpu_state) = { 0 }; |
1da177e4 LT |
362 | |
363 | int generic_cpu_disable(void) | |
364 | { | |
365 | unsigned int cpu = smp_processor_id(); | |
366 | ||
367 | if (cpu == boot_cpuid) | |
368 | return -EBUSY; | |
369 | ||
ea0f1cab | 370 | set_cpu_online(cpu, false); |
799d6046 | 371 | #ifdef CONFIG_PPC64 |
a7f290da | 372 | vdso_data->processorCount--; |
094fe2e7 | 373 | #endif |
1c91cc57 | 374 | migrate_irqs(); |
1da177e4 LT |
375 | return 0; |
376 | } | |
377 | ||
1da177e4 LT |
378 | void generic_cpu_die(unsigned int cpu) |
379 | { | |
380 | int i; | |
381 | ||
382 | for (i = 0; i < 100; i++) { | |
0d8d4d42 | 383 | smp_rmb(); |
1da177e4 LT |
384 | if (per_cpu(cpu_state, cpu) == CPU_DEAD) |
385 | return; | |
386 | msleep(100); | |
387 | } | |
388 | printk(KERN_ERR "CPU%d didn't die...\n", cpu); | |
389 | } | |
390 | ||
391 | void generic_mach_cpu_die(void) | |
392 | { | |
393 | unsigned int cpu; | |
394 | ||
395 | local_irq_disable(); | |
4fcb8833 | 396 | idle_task_exit(); |
1da177e4 LT |
397 | cpu = smp_processor_id(); |
398 | printk(KERN_DEBUG "CPU%d offline\n", cpu); | |
399 | __get_cpu_var(cpu_state) = CPU_DEAD; | |
0d8d4d42 | 400 | smp_wmb(); |
1da177e4 LT |
401 | while (__get_cpu_var(cpu_state) != CPU_UP_PREPARE) |
402 | cpu_relax(); | |
1da177e4 | 403 | } |
105765f4 BH |
404 | |
405 | void generic_set_cpu_dead(unsigned int cpu) | |
406 | { | |
407 | per_cpu(cpu_state, cpu) = CPU_DEAD; | |
408 | } | |
1da177e4 LT |
409 | #endif |
410 | ||
c56e5853 BH |
411 | struct create_idle { |
412 | struct work_struct work; | |
413 | struct task_struct *idle; | |
414 | struct completion done; | |
415 | int cpu; | |
416 | }; | |
417 | ||
418 | static void __cpuinit do_fork_idle(struct work_struct *work) | |
419 | { | |
420 | struct create_idle *c_idle = | |
421 | container_of(work, struct create_idle, work); | |
422 | ||
423 | c_idle->idle = fork_idle(c_idle->cpu); | |
424 | complete(&c_idle->done); | |
425 | } | |
426 | ||
427 | static int __cpuinit create_idle(unsigned int cpu) | |
428 | { | |
429 | struct thread_info *ti; | |
430 | struct create_idle c_idle = { | |
431 | .cpu = cpu, | |
432 | .done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done), | |
433 | }; | |
434 | INIT_WORK_ONSTACK(&c_idle.work, do_fork_idle); | |
435 | ||
436 | c_idle.idle = get_idle_for_cpu(cpu); | |
437 | ||
438 | /* We can't use kernel_thread since we must avoid to | |
439 | * reschedule the child. We use a workqueue because | |
440 | * we want to fork from a kernel thread, not whatever | |
441 | * userspace process happens to be trying to online us. | |
442 | */ | |
443 | if (!c_idle.idle) { | |
444 | schedule_work(&c_idle.work); | |
445 | wait_for_completion(&c_idle.done); | |
446 | } else | |
447 | init_idle(c_idle.idle, cpu); | |
448 | if (IS_ERR(c_idle.idle)) { | |
449 | pr_err("Failed fork for CPU %u: %li", cpu, PTR_ERR(c_idle.idle)); | |
450 | return PTR_ERR(c_idle.idle); | |
451 | } | |
452 | ti = task_thread_info(c_idle.idle); | |
453 | ||
454 | #ifdef CONFIG_PPC64 | |
455 | paca[cpu].__current = c_idle.idle; | |
456 | paca[cpu].kstack = (unsigned long)ti + THREAD_SIZE - STACK_FRAME_OVERHEAD; | |
457 | #endif | |
458 | ti->cpu = cpu; | |
459 | current_set[cpu] = ti; | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
b282b6f8 | 464 | int __cpuinit __cpu_up(unsigned int cpu) |
1da177e4 | 465 | { |
c56e5853 | 466 | int rc, c; |
1da177e4 | 467 | |
8cffc6ac BH |
468 | if (smp_ops == NULL || |
469 | (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu))) | |
1da177e4 LT |
470 | return -EINVAL; |
471 | ||
c56e5853 BH |
472 | /* Make sure we have an idle thread */ |
473 | rc = create_idle(cpu); | |
474 | if (rc) | |
475 | return rc; | |
476 | ||
c560bbce | 477 | secondary_ti = current_set[cpu]; |
478 | ||
1da177e4 LT |
479 | /* Make sure callin-map entry is 0 (can be leftover a CPU |
480 | * hotplug | |
481 | */ | |
482 | cpu_callin_map[cpu] = 0; | |
483 | ||
484 | /* The information for processor bringup must | |
485 | * be written out to main store before we release | |
486 | * the processor. | |
487 | */ | |
0d8d4d42 | 488 | smp_mb(); |
1da177e4 LT |
489 | |
490 | /* wake up cpus */ | |
491 | DBG("smp: kicking cpu %d\n", cpu); | |
de300974 ME |
492 | rc = smp_ops->kick_cpu(cpu); |
493 | if (rc) { | |
494 | pr_err("smp: failed starting cpu %d (rc %d)\n", cpu, rc); | |
495 | return rc; | |
496 | } | |
1da177e4 LT |
497 | |
498 | /* | |
499 | * wait to see if the cpu made a callin (is actually up). | |
500 | * use this value that I found through experimentation. | |
501 | * -- Cort | |
502 | */ | |
503 | if (system_state < SYSTEM_RUNNING) | |
ee0339f2 | 504 | for (c = 50000; c && !cpu_callin_map[cpu]; c--) |
1da177e4 LT |
505 | udelay(100); |
506 | #ifdef CONFIG_HOTPLUG_CPU | |
507 | else | |
508 | /* | |
509 | * CPUs can take much longer to come up in the | |
510 | * hotplug case. Wait five seconds. | |
511 | */ | |
67764263 GS |
512 | for (c = 5000; c && !cpu_callin_map[cpu]; c--) |
513 | msleep(1); | |
1da177e4 LT |
514 | #endif |
515 | ||
516 | if (!cpu_callin_map[cpu]) { | |
6685a477 | 517 | printk(KERN_ERR "Processor %u is stuck.\n", cpu); |
1da177e4 LT |
518 | return -ENOENT; |
519 | } | |
520 | ||
6685a477 | 521 | DBG("Processor %u found.\n", cpu); |
1da177e4 LT |
522 | |
523 | if (smp_ops->give_timebase) | |
524 | smp_ops->give_timebase(); | |
525 | ||
526 | /* Wait until cpu puts itself in the online map */ | |
527 | while (!cpu_online(cpu)) | |
528 | cpu_relax(); | |
529 | ||
530 | return 0; | |
531 | } | |
532 | ||
e9efed3b NL |
533 | /* Return the value of the reg property corresponding to the given |
534 | * logical cpu. | |
535 | */ | |
536 | int cpu_to_core_id(int cpu) | |
537 | { | |
538 | struct device_node *np; | |
539 | const int *reg; | |
540 | int id = -1; | |
541 | ||
542 | np = of_get_cpu_node(cpu, NULL); | |
543 | if (!np) | |
544 | goto out; | |
545 | ||
546 | reg = of_get_property(np, "reg", NULL); | |
547 | if (!reg) | |
548 | goto out; | |
549 | ||
550 | id = *reg; | |
551 | out: | |
552 | of_node_put(np); | |
553 | return id; | |
554 | } | |
555 | ||
99d86705 VS |
556 | /* Helper routines for cpu to core mapping */ |
557 | int cpu_core_index_of_thread(int cpu) | |
558 | { | |
559 | return cpu >> threads_shift; | |
560 | } | |
561 | EXPORT_SYMBOL_GPL(cpu_core_index_of_thread); | |
562 | ||
563 | int cpu_first_thread_of_core(int core) | |
564 | { | |
565 | return core << threads_shift; | |
566 | } | |
567 | EXPORT_SYMBOL_GPL(cpu_first_thread_of_core); | |
568 | ||
104699c0 | 569 | /* Must be called when no change can occur to cpu_present_mask, |
440a0857 NL |
570 | * i.e. during cpu online or offline. |
571 | */ | |
572 | static struct device_node *cpu_to_l2cache(int cpu) | |
573 | { | |
574 | struct device_node *np; | |
b2ea25b9 | 575 | struct device_node *cache; |
440a0857 NL |
576 | |
577 | if (!cpu_present(cpu)) | |
578 | return NULL; | |
579 | ||
580 | np = of_get_cpu_node(cpu, NULL); | |
581 | if (np == NULL) | |
582 | return NULL; | |
583 | ||
b2ea25b9 NL |
584 | cache = of_find_next_cache_node(np); |
585 | ||
440a0857 NL |
586 | of_node_put(np); |
587 | ||
b2ea25b9 | 588 | return cache; |
440a0857 | 589 | } |
1da177e4 LT |
590 | |
591 | /* Activate a secondary processor. */ | |
fa3f82c8 | 592 | void __devinit start_secondary(void *unused) |
1da177e4 LT |
593 | { |
594 | unsigned int cpu = smp_processor_id(); | |
440a0857 | 595 | struct device_node *l2_cache; |
e2075f79 | 596 | int i, base; |
1da177e4 LT |
597 | |
598 | atomic_inc(&init_mm.mm_count); | |
599 | current->active_mm = &init_mm; | |
600 | ||
601 | smp_store_cpu_info(cpu); | |
5ad57078 | 602 | set_dec(tb_ticks_per_jiffy); |
e4d76e1c | 603 | preempt_disable(); |
1da177e4 LT |
604 | cpu_callin_map[cpu] = 1; |
605 | ||
757cbd46 KG |
606 | if (smp_ops->setup_cpu) |
607 | smp_ops->setup_cpu(cpu); | |
1da177e4 LT |
608 | if (smp_ops->take_timebase) |
609 | smp_ops->take_timebase(); | |
610 | ||
d831d0b8 TB |
611 | secondary_cpu_time_init(); |
612 | ||
aeeafbfa BH |
613 | #ifdef CONFIG_PPC64 |
614 | if (system_state == SYSTEM_RUNNING) | |
615 | vdso_data->processorCount++; | |
616 | #endif | |
b7d7a240 | 617 | ipi_call_lock(); |
e545a614 | 618 | notify_cpu_starting(cpu); |
ea0f1cab | 619 | set_cpu_online(cpu, true); |
e2075f79 | 620 | /* Update sibling maps */ |
99d86705 | 621 | base = cpu_first_thread_sibling(cpu); |
e2075f79 NL |
622 | for (i = 0; i < threads_per_core; i++) { |
623 | if (cpu_is_offline(base + i)) | |
624 | continue; | |
cc1ba8ea AB |
625 | cpumask_set_cpu(cpu, cpu_sibling_mask(base + i)); |
626 | cpumask_set_cpu(base + i, cpu_sibling_mask(cpu)); | |
440a0857 NL |
627 | |
628 | /* cpu_core_map should be a superset of | |
629 | * cpu_sibling_map even if we don't have cache | |
630 | * information, so update the former here, too. | |
631 | */ | |
cc1ba8ea AB |
632 | cpumask_set_cpu(cpu, cpu_core_mask(base + i)); |
633 | cpumask_set_cpu(base + i, cpu_core_mask(cpu)); | |
e2075f79 | 634 | } |
440a0857 NL |
635 | l2_cache = cpu_to_l2cache(cpu); |
636 | for_each_online_cpu(i) { | |
637 | struct device_node *np = cpu_to_l2cache(i); | |
638 | if (!np) | |
639 | continue; | |
640 | if (np == l2_cache) { | |
cc1ba8ea AB |
641 | cpumask_set_cpu(cpu, cpu_core_mask(i)); |
642 | cpumask_set_cpu(i, cpu_core_mask(cpu)); | |
440a0857 NL |
643 | } |
644 | of_node_put(np); | |
645 | } | |
646 | of_node_put(l2_cache); | |
b7d7a240 | 647 | ipi_call_unlock(); |
1da177e4 LT |
648 | |
649 | local_irq_enable(); | |
650 | ||
651 | cpu_idle(); | |
fa3f82c8 BH |
652 | |
653 | BUG(); | |
1da177e4 LT |
654 | } |
655 | ||
656 | int setup_profiling_timer(unsigned int multiplier) | |
657 | { | |
658 | return 0; | |
659 | } | |
660 | ||
661 | void __init smp_cpus_done(unsigned int max_cpus) | |
662 | { | |
bfb9126d | 663 | cpumask_var_t old_mask; |
1da177e4 LT |
664 | |
665 | /* We want the setup_cpu() here to be called from CPU 0, but our | |
666 | * init thread may have been "borrowed" by another CPU in the meantime | |
667 | * se we pin us down to CPU 0 for a short while | |
668 | */ | |
bfb9126d | 669 | alloc_cpumask_var(&old_mask, GFP_NOWAIT); |
104699c0 | 670 | cpumask_copy(old_mask, tsk_cpus_allowed(current)); |
21dbeb91 | 671 | set_cpus_allowed_ptr(current, cpumask_of(boot_cpuid)); |
1da177e4 | 672 | |
757cbd46 | 673 | if (smp_ops && smp_ops->setup_cpu) |
8cffc6ac | 674 | smp_ops->setup_cpu(boot_cpuid); |
1da177e4 | 675 | |
bfb9126d AB |
676 | set_cpus_allowed_ptr(current, old_mask); |
677 | ||
678 | free_cpumask_var(old_mask); | |
4b703a23 | 679 | |
d7294445 BH |
680 | if (smp_ops && smp_ops->bringup_done) |
681 | smp_ops->bringup_done(); | |
682 | ||
4b703a23 | 683 | dump_numa_cpu_topology(); |
d7294445 | 684 | |
1da177e4 LT |
685 | } |
686 | ||
e1f0ece1 MN |
687 | int arch_sd_sibling_asym_packing(void) |
688 | { | |
689 | if (cpu_has_feature(CPU_FTR_ASYM_SMT)) { | |
690 | printk_once(KERN_INFO "Enabling Asymmetric SMT scheduling\n"); | |
691 | return SD_ASYM_PACKING; | |
692 | } | |
693 | return 0; | |
694 | } | |
695 | ||
1da177e4 LT |
696 | #ifdef CONFIG_HOTPLUG_CPU |
697 | int __cpu_disable(void) | |
698 | { | |
440a0857 | 699 | struct device_node *l2_cache; |
e2075f79 NL |
700 | int cpu = smp_processor_id(); |
701 | int base, i; | |
702 | int err; | |
1da177e4 | 703 | |
e2075f79 NL |
704 | if (!smp_ops->cpu_disable) |
705 | return -ENOSYS; | |
706 | ||
707 | err = smp_ops->cpu_disable(); | |
708 | if (err) | |
709 | return err; | |
710 | ||
711 | /* Update sibling maps */ | |
99d86705 | 712 | base = cpu_first_thread_sibling(cpu); |
e2075f79 | 713 | for (i = 0; i < threads_per_core; i++) { |
cc1ba8ea AB |
714 | cpumask_clear_cpu(cpu, cpu_sibling_mask(base + i)); |
715 | cpumask_clear_cpu(base + i, cpu_sibling_mask(cpu)); | |
716 | cpumask_clear_cpu(cpu, cpu_core_mask(base + i)); | |
717 | cpumask_clear_cpu(base + i, cpu_core_mask(cpu)); | |
440a0857 NL |
718 | } |
719 | ||
720 | l2_cache = cpu_to_l2cache(cpu); | |
721 | for_each_present_cpu(i) { | |
722 | struct device_node *np = cpu_to_l2cache(i); | |
723 | if (!np) | |
724 | continue; | |
725 | if (np == l2_cache) { | |
cc1ba8ea AB |
726 | cpumask_clear_cpu(cpu, cpu_core_mask(i)); |
727 | cpumask_clear_cpu(i, cpu_core_mask(cpu)); | |
440a0857 NL |
728 | } |
729 | of_node_put(np); | |
e2075f79 | 730 | } |
440a0857 NL |
731 | of_node_put(l2_cache); |
732 | ||
e2075f79 NL |
733 | |
734 | return 0; | |
1da177e4 LT |
735 | } |
736 | ||
737 | void __cpu_die(unsigned int cpu) | |
738 | { | |
739 | if (smp_ops->cpu_die) | |
740 | smp_ops->cpu_die(cpu); | |
741 | } | |
d0174c72 NF |
742 | |
743 | static DEFINE_MUTEX(powerpc_cpu_hotplug_driver_mutex); | |
744 | ||
745 | void cpu_hotplug_driver_lock() | |
746 | { | |
747 | mutex_lock(&powerpc_cpu_hotplug_driver_mutex); | |
748 | } | |
749 | ||
750 | void cpu_hotplug_driver_unlock() | |
751 | { | |
752 | mutex_unlock(&powerpc_cpu_hotplug_driver_mutex); | |
753 | } | |
abb17f9c MM |
754 | |
755 | void cpu_die(void) | |
756 | { | |
757 | if (ppc_md.cpu_die) | |
758 | ppc_md.cpu_die(); | |
fa3f82c8 BH |
759 | |
760 | /* If we return, we re-enter start_secondary */ | |
761 | start_secondary_resume(); | |
abb17f9c | 762 | } |
fa3f82c8 | 763 | |
1da177e4 | 764 | #endif |