Commit | Line | Data |
---|---|---|
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 | 20 | #include <linux/kernel.h> |
4b16f8e2 | 21 | #include <linux/export.h> |
1da177e4 LT |
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)) | |
fb82b839 BH |
73 | |
74 | /* State of each CPU during hotplug phases */ | |
75 | static DEFINE_PER_CPU(int, cpu_state) = { 0 }; | |
76 | ||
c56e5853 BH |
77 | #else |
78 | static struct task_struct *idle_thread_array[NR_CPUS] __cpuinitdata ; | |
79 | #define get_idle_for_cpu(x) (idle_thread_array[(x)]) | |
80 | #define set_idle_for_cpu(x, p) (idle_thread_array[(x)] = (p)) | |
81 | #endif | |
82 | ||
f9e4ec57 ME |
83 | struct thread_info *secondary_ti; |
84 | ||
cc1ba8ea AB |
85 | DEFINE_PER_CPU(cpumask_var_t, cpu_sibling_map); |
86 | DEFINE_PER_CPU(cpumask_var_t, cpu_core_map); | |
1da177e4 | 87 | |
d5a7430d | 88 | EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); |
440a0857 | 89 | EXPORT_PER_CPU_SYMBOL(cpu_core_map); |
1da177e4 | 90 | |
5ad57078 | 91 | /* SMP operations for this machine */ |
1da177e4 LT |
92 | struct smp_ops_t *smp_ops; |
93 | ||
7ccbe504 BH |
94 | /* Can't be static due to PowerMac hackery */ |
95 | volatile unsigned int cpu_callin_map[NR_CPUS]; | |
1da177e4 | 96 | |
1da177e4 LT |
97 | int smt_enabled_at_boot = 1; |
98 | ||
cc532915 ME |
99 | static void (*crash_ipi_function_ptr)(struct pt_regs *) = NULL; |
100 | ||
5ad57078 | 101 | #ifdef CONFIG_PPC64 |
de300974 | 102 | int __devinit smp_generic_kick_cpu(int nr) |
1da177e4 LT |
103 | { |
104 | BUG_ON(nr < 0 || nr >= NR_CPUS); | |
105 | ||
106 | /* | |
107 | * The processor is currently spinning, waiting for the | |
108 | * cpu_start field to become non-zero After we set cpu_start, | |
109 | * the processor will continue on to secondary_start | |
110 | */ | |
fb82b839 BH |
111 | if (!paca[nr].cpu_start) { |
112 | paca[nr].cpu_start = 1; | |
113 | smp_mb(); | |
114 | return 0; | |
115 | } | |
116 | ||
117 | #ifdef CONFIG_HOTPLUG_CPU | |
118 | /* | |
119 | * Ok it's not there, so it might be soft-unplugged, let's | |
120 | * try to bring it back | |
121 | */ | |
122 | per_cpu(cpu_state, nr) = CPU_UP_PREPARE; | |
123 | smp_wmb(); | |
124 | smp_send_reschedule(nr); | |
125 | #endif /* CONFIG_HOTPLUG_CPU */ | |
de300974 ME |
126 | |
127 | return 0; | |
1da177e4 | 128 | } |
fb82b839 | 129 | #endif /* CONFIG_PPC64 */ |
1da177e4 | 130 | |
25ddd738 MM |
131 | static irqreturn_t call_function_action(int irq, void *data) |
132 | { | |
133 | generic_smp_call_function_interrupt(); | |
134 | return IRQ_HANDLED; | |
135 | } | |
136 | ||
137 | static irqreturn_t reschedule_action(int irq, void *data) | |
138 | { | |
184748cc | 139 | scheduler_ipi(); |
25ddd738 MM |
140 | return IRQ_HANDLED; |
141 | } | |
142 | ||
143 | static irqreturn_t call_function_single_action(int irq, void *data) | |
144 | { | |
145 | generic_smp_call_function_single_interrupt(); | |
146 | return IRQ_HANDLED; | |
147 | } | |
148 | ||
7ef71d75 | 149 | static irqreturn_t debug_ipi_action(int irq, void *data) |
25ddd738 | 150 | { |
23d72bfd MM |
151 | if (crash_ipi_function_ptr) { |
152 | crash_ipi_function_ptr(get_irq_regs()); | |
153 | return IRQ_HANDLED; | |
154 | } | |
155 | ||
156 | #ifdef CONFIG_DEBUGGER | |
157 | debugger_ipi(get_irq_regs()); | |
158 | #endif /* CONFIG_DEBUGGER */ | |
159 | ||
25ddd738 MM |
160 | return IRQ_HANDLED; |
161 | } | |
162 | ||
163 | static irq_handler_t smp_ipi_action[] = { | |
164 | [PPC_MSG_CALL_FUNCTION] = call_function_action, | |
165 | [PPC_MSG_RESCHEDULE] = reschedule_action, | |
166 | [PPC_MSG_CALL_FUNC_SINGLE] = call_function_single_action, | |
167 | [PPC_MSG_DEBUGGER_BREAK] = debug_ipi_action, | |
168 | }; | |
169 | ||
170 | const char *smp_ipi_name[] = { | |
171 | [PPC_MSG_CALL_FUNCTION] = "ipi call function", | |
172 | [PPC_MSG_RESCHEDULE] = "ipi reschedule", | |
173 | [PPC_MSG_CALL_FUNC_SINGLE] = "ipi call function single", | |
174 | [PPC_MSG_DEBUGGER_BREAK] = "ipi debugger", | |
175 | }; | |
176 | ||
177 | /* optional function to request ipi, for controllers with >= 4 ipis */ | |
178 | int smp_request_message_ipi(int virq, int msg) | |
179 | { | |
180 | int err; | |
181 | ||
182 | if (msg < 0 || msg > PPC_MSG_DEBUGGER_BREAK) { | |
183 | return -EINVAL; | |
184 | } | |
185 | #if !defined(CONFIG_DEBUGGER) && !defined(CONFIG_KEXEC) | |
186 | if (msg == PPC_MSG_DEBUGGER_BREAK) { | |
187 | return 1; | |
188 | } | |
189 | #endif | |
a3a9f3b4 | 190 | err = request_irq(virq, smp_ipi_action[msg], IRQF_PERCPU, |
25ddd738 MM |
191 | smp_ipi_name[msg], 0); |
192 | WARN(err < 0, "unable to request_irq %d for %s (rc %d)\n", | |
193 | virq, smp_ipi_name[msg], err); | |
194 | ||
195 | return err; | |
196 | } | |
197 | ||
1ece355b | 198 | #ifdef CONFIG_PPC_SMP_MUXED_IPI |
23d72bfd | 199 | struct cpu_messages { |
71454272 | 200 | int messages; /* current messages */ |
23d72bfd MM |
201 | unsigned long data; /* data for cause ipi */ |
202 | }; | |
203 | static DEFINE_PER_CPU_SHARED_ALIGNED(struct cpu_messages, ipi_message); | |
204 | ||
205 | void smp_muxed_ipi_set_data(int cpu, unsigned long data) | |
206 | { | |
207 | struct cpu_messages *info = &per_cpu(ipi_message, cpu); | |
208 | ||
209 | info->data = data; | |
210 | } | |
211 | ||
212 | void smp_muxed_ipi_message_pass(int cpu, int msg) | |
213 | { | |
214 | struct cpu_messages *info = &per_cpu(ipi_message, cpu); | |
71454272 | 215 | char *message = (char *)&info->messages; |
23d72bfd | 216 | |
71454272 | 217 | message[msg] = 1; |
23d72bfd MM |
218 | mb(); |
219 | smp_ops->cause_ipi(cpu, info->data); | |
220 | } | |
221 | ||
23d72bfd MM |
222 | irqreturn_t smp_ipi_demux(void) |
223 | { | |
224 | struct cpu_messages *info = &__get_cpu_var(ipi_message); | |
71454272 | 225 | unsigned int all; |
23d72bfd MM |
226 | |
227 | mb(); /* order any irq clear */ | |
71454272 MM |
228 | |
229 | do { | |
230 | all = xchg_local(&info->messages, 0); | |
231 | ||
232 | #ifdef __BIG_ENDIAN | |
233 | if (all & (1 << (24 - 8 * PPC_MSG_CALL_FUNCTION))) | |
23d72bfd | 234 | generic_smp_call_function_interrupt(); |
71454272 | 235 | if (all & (1 << (24 - 8 * PPC_MSG_RESCHEDULE))) |
880102e7 | 236 | scheduler_ipi(); |
71454272 | 237 | if (all & (1 << (24 - 8 * PPC_MSG_CALL_FUNC_SINGLE))) |
23d72bfd | 238 | generic_smp_call_function_single_interrupt(); |
71454272 | 239 | if (all & (1 << (24 - 8 * PPC_MSG_DEBUGGER_BREAK))) |
23d72bfd | 240 | debug_ipi_action(0, NULL); |
71454272 MM |
241 | #else |
242 | #error Unsupported ENDIAN | |
23d72bfd | 243 | #endif |
71454272 MM |
244 | } while (info->messages); |
245 | ||
23d72bfd MM |
246 | return IRQ_HANDLED; |
247 | } | |
1ece355b | 248 | #endif /* CONFIG_PPC_SMP_MUXED_IPI */ |
23d72bfd | 249 | |
9ca980dc PM |
250 | static inline void do_message_pass(int cpu, int msg) |
251 | { | |
252 | if (smp_ops->message_pass) | |
253 | smp_ops->message_pass(cpu, msg); | |
254 | #ifdef CONFIG_PPC_SMP_MUXED_IPI | |
255 | else | |
256 | smp_muxed_ipi_message_pass(cpu, msg); | |
257 | #endif | |
258 | } | |
259 | ||
1da177e4 LT |
260 | void smp_send_reschedule(int cpu) |
261 | { | |
8cffc6ac | 262 | if (likely(smp_ops)) |
9ca980dc | 263 | do_message_pass(cpu, PPC_MSG_RESCHEDULE); |
1da177e4 | 264 | } |
de56a948 | 265 | EXPORT_SYMBOL_GPL(smp_send_reschedule); |
1da177e4 | 266 | |
b7d7a240 JA |
267 | void arch_send_call_function_single_ipi(int cpu) |
268 | { | |
9ca980dc | 269 | do_message_pass(cpu, PPC_MSG_CALL_FUNC_SINGLE); |
b7d7a240 JA |
270 | } |
271 | ||
f063ea02 | 272 | void arch_send_call_function_ipi_mask(const struct cpumask *mask) |
b7d7a240 JA |
273 | { |
274 | unsigned int cpu; | |
275 | ||
f063ea02 | 276 | for_each_cpu(cpu, mask) |
9ca980dc | 277 | do_message_pass(cpu, PPC_MSG_CALL_FUNCTION); |
b7d7a240 JA |
278 | } |
279 | ||
e0476371 MM |
280 | #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC) |
281 | void smp_send_debugger_break(void) | |
1da177e4 | 282 | { |
e0476371 MM |
283 | int cpu; |
284 | int me = raw_smp_processor_id(); | |
285 | ||
286 | if (unlikely(!smp_ops)) | |
287 | return; | |
288 | ||
289 | for_each_online_cpu(cpu) | |
290 | if (cpu != me) | |
9ca980dc | 291 | do_message_pass(cpu, PPC_MSG_DEBUGGER_BREAK); |
1da177e4 LT |
292 | } |
293 | #endif | |
294 | ||
cc532915 ME |
295 | #ifdef CONFIG_KEXEC |
296 | void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *)) | |
297 | { | |
298 | crash_ipi_function_ptr = crash_ipi_callback; | |
e0476371 | 299 | if (crash_ipi_callback) { |
cc532915 | 300 | mb(); |
e0476371 | 301 | smp_send_debugger_break(); |
cc532915 ME |
302 | } |
303 | } | |
304 | #endif | |
305 | ||
1da177e4 LT |
306 | static void stop_this_cpu(void *dummy) |
307 | { | |
8389b37d VB |
308 | /* Remove this CPU */ |
309 | set_cpu_online(smp_processor_id(), false); | |
310 | ||
1da177e4 LT |
311 | local_irq_disable(); |
312 | while (1) | |
313 | ; | |
314 | } | |
315 | ||
8fd7675c SS |
316 | void smp_send_stop(void) |
317 | { | |
8691e5a8 | 318 | smp_call_function(stop_this_cpu, NULL, 0); |
1da177e4 LT |
319 | } |
320 | ||
1da177e4 LT |
321 | struct thread_info *current_set[NR_CPUS]; |
322 | ||
1da177e4 LT |
323 | static void __devinit smp_store_cpu_info(int id) |
324 | { | |
6b7487fc | 325 | per_cpu(cpu_pvr, id) = mfspr(SPRN_PVR); |
3160b097 BB |
326 | #ifdef CONFIG_PPC_FSL_BOOK3E |
327 | per_cpu(next_tlbcam_idx, id) | |
328 | = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1; | |
329 | #endif | |
1da177e4 LT |
330 | } |
331 | ||
1da177e4 LT |
332 | void __init smp_prepare_cpus(unsigned int max_cpus) |
333 | { | |
334 | unsigned int cpu; | |
335 | ||
336 | DBG("smp_prepare_cpus\n"); | |
337 | ||
338 | /* | |
339 | * setup_cpu may need to be called on the boot cpu. We havent | |
340 | * spun any cpus up but lets be paranoid. | |
341 | */ | |
342 | BUG_ON(boot_cpuid != smp_processor_id()); | |
343 | ||
344 | /* Fixup boot cpu */ | |
345 | smp_store_cpu_info(boot_cpuid); | |
346 | cpu_callin_map[boot_cpuid] = 1; | |
347 | ||
cc1ba8ea AB |
348 | for_each_possible_cpu(cpu) { |
349 | zalloc_cpumask_var_node(&per_cpu(cpu_sibling_map, cpu), | |
350 | GFP_KERNEL, cpu_to_node(cpu)); | |
351 | zalloc_cpumask_var_node(&per_cpu(cpu_core_map, cpu), | |
352 | GFP_KERNEL, cpu_to_node(cpu)); | |
353 | } | |
354 | ||
355 | cpumask_set_cpu(boot_cpuid, cpu_sibling_mask(boot_cpuid)); | |
356 | cpumask_set_cpu(boot_cpuid, cpu_core_mask(boot_cpuid)); | |
357 | ||
8cffc6ac | 358 | if (smp_ops) |
757cbd46 KG |
359 | if (smp_ops->probe) |
360 | max_cpus = smp_ops->probe(); | |
361 | else | |
362 | max_cpus = NR_CPUS; | |
8cffc6ac BH |
363 | else |
364 | max_cpus = 1; | |
1da177e4 LT |
365 | } |
366 | ||
367 | void __devinit smp_prepare_boot_cpu(void) | |
368 | { | |
369 | BUG_ON(smp_processor_id() != boot_cpuid); | |
5ad57078 | 370 | #ifdef CONFIG_PPC64 |
1da177e4 | 371 | paca[boot_cpuid].__current = current; |
5ad57078 | 372 | #endif |
b5e2fc1c | 373 | current_set[boot_cpuid] = task_thread_info(current); |
1da177e4 LT |
374 | } |
375 | ||
376 | #ifdef CONFIG_HOTPLUG_CPU | |
1da177e4 LT |
377 | |
378 | int generic_cpu_disable(void) | |
379 | { | |
380 | unsigned int cpu = smp_processor_id(); | |
381 | ||
382 | if (cpu == boot_cpuid) | |
383 | return -EBUSY; | |
384 | ||
ea0f1cab | 385 | set_cpu_online(cpu, false); |
799d6046 | 386 | #ifdef CONFIG_PPC64 |
a7f290da | 387 | vdso_data->processorCount--; |
094fe2e7 | 388 | #endif |
1c91cc57 | 389 | migrate_irqs(); |
1da177e4 LT |
390 | return 0; |
391 | } | |
392 | ||
1da177e4 LT |
393 | void generic_cpu_die(unsigned int cpu) |
394 | { | |
395 | int i; | |
396 | ||
397 | for (i = 0; i < 100; i++) { | |
0d8d4d42 | 398 | smp_rmb(); |
1da177e4 LT |
399 | if (per_cpu(cpu_state, cpu) == CPU_DEAD) |
400 | return; | |
401 | msleep(100); | |
402 | } | |
403 | printk(KERN_ERR "CPU%d didn't die...\n", cpu); | |
404 | } | |
405 | ||
406 | void generic_mach_cpu_die(void) | |
407 | { | |
408 | unsigned int cpu; | |
409 | ||
410 | local_irq_disable(); | |
4fcb8833 | 411 | idle_task_exit(); |
1da177e4 LT |
412 | cpu = smp_processor_id(); |
413 | printk(KERN_DEBUG "CPU%d offline\n", cpu); | |
414 | __get_cpu_var(cpu_state) = CPU_DEAD; | |
0d8d4d42 | 415 | smp_wmb(); |
1da177e4 LT |
416 | while (__get_cpu_var(cpu_state) != CPU_UP_PREPARE) |
417 | cpu_relax(); | |
1da177e4 | 418 | } |
105765f4 BH |
419 | |
420 | void generic_set_cpu_dead(unsigned int cpu) | |
421 | { | |
422 | per_cpu(cpu_state, cpu) = CPU_DEAD; | |
423 | } | |
fb82b839 BH |
424 | |
425 | int generic_check_cpu_restart(unsigned int cpu) | |
426 | { | |
427 | return per_cpu(cpu_state, cpu) == CPU_UP_PREPARE; | |
428 | } | |
1da177e4 LT |
429 | #endif |
430 | ||
c56e5853 BH |
431 | struct create_idle { |
432 | struct work_struct work; | |
433 | struct task_struct *idle; | |
434 | struct completion done; | |
435 | int cpu; | |
436 | }; | |
437 | ||
438 | static void __cpuinit do_fork_idle(struct work_struct *work) | |
439 | { | |
440 | struct create_idle *c_idle = | |
441 | container_of(work, struct create_idle, work); | |
442 | ||
443 | c_idle->idle = fork_idle(c_idle->cpu); | |
444 | complete(&c_idle->done); | |
445 | } | |
446 | ||
447 | static int __cpuinit create_idle(unsigned int cpu) | |
448 | { | |
449 | struct thread_info *ti; | |
450 | struct create_idle c_idle = { | |
451 | .cpu = cpu, | |
452 | .done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done), | |
453 | }; | |
454 | INIT_WORK_ONSTACK(&c_idle.work, do_fork_idle); | |
455 | ||
456 | c_idle.idle = get_idle_for_cpu(cpu); | |
457 | ||
458 | /* We can't use kernel_thread since we must avoid to | |
459 | * reschedule the child. We use a workqueue because | |
460 | * we want to fork from a kernel thread, not whatever | |
461 | * userspace process happens to be trying to online us. | |
462 | */ | |
463 | if (!c_idle.idle) { | |
464 | schedule_work(&c_idle.work); | |
465 | wait_for_completion(&c_idle.done); | |
466 | } else | |
467 | init_idle(c_idle.idle, cpu); | |
468 | if (IS_ERR(c_idle.idle)) { | |
469 | pr_err("Failed fork for CPU %u: %li", cpu, PTR_ERR(c_idle.idle)); | |
470 | return PTR_ERR(c_idle.idle); | |
471 | } | |
472 | ti = task_thread_info(c_idle.idle); | |
473 | ||
474 | #ifdef CONFIG_PPC64 | |
475 | paca[cpu].__current = c_idle.idle; | |
476 | paca[cpu].kstack = (unsigned long)ti + THREAD_SIZE - STACK_FRAME_OVERHEAD; | |
477 | #endif | |
478 | ti->cpu = cpu; | |
479 | current_set[cpu] = ti; | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
b282b6f8 | 484 | int __cpuinit __cpu_up(unsigned int cpu) |
1da177e4 | 485 | { |
c56e5853 | 486 | int rc, c; |
1da177e4 | 487 | |
8cffc6ac BH |
488 | if (smp_ops == NULL || |
489 | (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu))) | |
1da177e4 LT |
490 | return -EINVAL; |
491 | ||
c56e5853 BH |
492 | /* Make sure we have an idle thread */ |
493 | rc = create_idle(cpu); | |
494 | if (rc) | |
495 | return rc; | |
496 | ||
c560bbce | 497 | secondary_ti = current_set[cpu]; |
498 | ||
1da177e4 LT |
499 | /* Make sure callin-map entry is 0 (can be leftover a CPU |
500 | * hotplug | |
501 | */ | |
502 | cpu_callin_map[cpu] = 0; | |
503 | ||
504 | /* The information for processor bringup must | |
505 | * be written out to main store before we release | |
506 | * the processor. | |
507 | */ | |
0d8d4d42 | 508 | smp_mb(); |
1da177e4 LT |
509 | |
510 | /* wake up cpus */ | |
511 | DBG("smp: kicking cpu %d\n", cpu); | |
de300974 ME |
512 | rc = smp_ops->kick_cpu(cpu); |
513 | if (rc) { | |
514 | pr_err("smp: failed starting cpu %d (rc %d)\n", cpu, rc); | |
515 | return rc; | |
516 | } | |
1da177e4 LT |
517 | |
518 | /* | |
519 | * wait to see if the cpu made a callin (is actually up). | |
520 | * use this value that I found through experimentation. | |
521 | * -- Cort | |
522 | */ | |
523 | if (system_state < SYSTEM_RUNNING) | |
ee0339f2 | 524 | for (c = 50000; c && !cpu_callin_map[cpu]; c--) |
1da177e4 LT |
525 | udelay(100); |
526 | #ifdef CONFIG_HOTPLUG_CPU | |
527 | else | |
528 | /* | |
529 | * CPUs can take much longer to come up in the | |
530 | * hotplug case. Wait five seconds. | |
531 | */ | |
67764263 GS |
532 | for (c = 5000; c && !cpu_callin_map[cpu]; c--) |
533 | msleep(1); | |
1da177e4 LT |
534 | #endif |
535 | ||
536 | if (!cpu_callin_map[cpu]) { | |
6685a477 | 537 | printk(KERN_ERR "Processor %u is stuck.\n", cpu); |
1da177e4 LT |
538 | return -ENOENT; |
539 | } | |
540 | ||
6685a477 | 541 | DBG("Processor %u found.\n", cpu); |
1da177e4 LT |
542 | |
543 | if (smp_ops->give_timebase) | |
544 | smp_ops->give_timebase(); | |
545 | ||
546 | /* Wait until cpu puts itself in the online map */ | |
547 | while (!cpu_online(cpu)) | |
548 | cpu_relax(); | |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
e9efed3b NL |
553 | /* Return the value of the reg property corresponding to the given |
554 | * logical cpu. | |
555 | */ | |
556 | int cpu_to_core_id(int cpu) | |
557 | { | |
558 | struct device_node *np; | |
559 | const int *reg; | |
560 | int id = -1; | |
561 | ||
562 | np = of_get_cpu_node(cpu, NULL); | |
563 | if (!np) | |
564 | goto out; | |
565 | ||
566 | reg = of_get_property(np, "reg", NULL); | |
567 | if (!reg) | |
568 | goto out; | |
569 | ||
570 | id = *reg; | |
571 | out: | |
572 | of_node_put(np); | |
573 | return id; | |
574 | } | |
575 | ||
99d86705 VS |
576 | /* Helper routines for cpu to core mapping */ |
577 | int cpu_core_index_of_thread(int cpu) | |
578 | { | |
579 | return cpu >> threads_shift; | |
580 | } | |
581 | EXPORT_SYMBOL_GPL(cpu_core_index_of_thread); | |
582 | ||
583 | int cpu_first_thread_of_core(int core) | |
584 | { | |
585 | return core << threads_shift; | |
586 | } | |
587 | EXPORT_SYMBOL_GPL(cpu_first_thread_of_core); | |
588 | ||
104699c0 | 589 | /* Must be called when no change can occur to cpu_present_mask, |
440a0857 NL |
590 | * i.e. during cpu online or offline. |
591 | */ | |
592 | static struct device_node *cpu_to_l2cache(int cpu) | |
593 | { | |
594 | struct device_node *np; | |
b2ea25b9 | 595 | struct device_node *cache; |
440a0857 NL |
596 | |
597 | if (!cpu_present(cpu)) | |
598 | return NULL; | |
599 | ||
600 | np = of_get_cpu_node(cpu, NULL); | |
601 | if (np == NULL) | |
602 | return NULL; | |
603 | ||
b2ea25b9 NL |
604 | cache = of_find_next_cache_node(np); |
605 | ||
440a0857 NL |
606 | of_node_put(np); |
607 | ||
b2ea25b9 | 608 | return cache; |
440a0857 | 609 | } |
1da177e4 LT |
610 | |
611 | /* Activate a secondary processor. */ | |
fa3f82c8 | 612 | void __devinit start_secondary(void *unused) |
1da177e4 LT |
613 | { |
614 | unsigned int cpu = smp_processor_id(); | |
440a0857 | 615 | struct device_node *l2_cache; |
e2075f79 | 616 | int i, base; |
1da177e4 LT |
617 | |
618 | atomic_inc(&init_mm.mm_count); | |
619 | current->active_mm = &init_mm; | |
620 | ||
621 | smp_store_cpu_info(cpu); | |
5ad57078 | 622 | set_dec(tb_ticks_per_jiffy); |
e4d76e1c | 623 | preempt_disable(); |
1da177e4 LT |
624 | cpu_callin_map[cpu] = 1; |
625 | ||
757cbd46 KG |
626 | if (smp_ops->setup_cpu) |
627 | smp_ops->setup_cpu(cpu); | |
1da177e4 LT |
628 | if (smp_ops->take_timebase) |
629 | smp_ops->take_timebase(); | |
630 | ||
d831d0b8 TB |
631 | secondary_cpu_time_init(); |
632 | ||
aeeafbfa BH |
633 | #ifdef CONFIG_PPC64 |
634 | if (system_state == SYSTEM_RUNNING) | |
635 | vdso_data->processorCount++; | |
636 | #endif | |
b7d7a240 | 637 | ipi_call_lock(); |
e545a614 | 638 | notify_cpu_starting(cpu); |
ea0f1cab | 639 | set_cpu_online(cpu, true); |
e2075f79 | 640 | /* Update sibling maps */ |
99d86705 | 641 | base = cpu_first_thread_sibling(cpu); |
e2075f79 NL |
642 | for (i = 0; i < threads_per_core; i++) { |
643 | if (cpu_is_offline(base + i)) | |
644 | continue; | |
cc1ba8ea AB |
645 | cpumask_set_cpu(cpu, cpu_sibling_mask(base + i)); |
646 | cpumask_set_cpu(base + i, cpu_sibling_mask(cpu)); | |
440a0857 NL |
647 | |
648 | /* cpu_core_map should be a superset of | |
649 | * cpu_sibling_map even if we don't have cache | |
650 | * information, so update the former here, too. | |
651 | */ | |
cc1ba8ea AB |
652 | cpumask_set_cpu(cpu, cpu_core_mask(base + i)); |
653 | cpumask_set_cpu(base + i, cpu_core_mask(cpu)); | |
e2075f79 | 654 | } |
440a0857 NL |
655 | l2_cache = cpu_to_l2cache(cpu); |
656 | for_each_online_cpu(i) { | |
657 | struct device_node *np = cpu_to_l2cache(i); | |
658 | if (!np) | |
659 | continue; | |
660 | if (np == l2_cache) { | |
cc1ba8ea AB |
661 | cpumask_set_cpu(cpu, cpu_core_mask(i)); |
662 | cpumask_set_cpu(i, cpu_core_mask(cpu)); | |
440a0857 NL |
663 | } |
664 | of_node_put(np); | |
665 | } | |
666 | of_node_put(l2_cache); | |
b7d7a240 | 667 | ipi_call_unlock(); |
1da177e4 LT |
668 | |
669 | local_irq_enable(); | |
670 | ||
671 | cpu_idle(); | |
fa3f82c8 BH |
672 | |
673 | BUG(); | |
1da177e4 LT |
674 | } |
675 | ||
676 | int setup_profiling_timer(unsigned int multiplier) | |
677 | { | |
678 | return 0; | |
679 | } | |
680 | ||
681 | void __init smp_cpus_done(unsigned int max_cpus) | |
682 | { | |
bfb9126d | 683 | cpumask_var_t old_mask; |
1da177e4 LT |
684 | |
685 | /* We want the setup_cpu() here to be called from CPU 0, but our | |
686 | * init thread may have been "borrowed" by another CPU in the meantime | |
687 | * se we pin us down to CPU 0 for a short while | |
688 | */ | |
bfb9126d | 689 | alloc_cpumask_var(&old_mask, GFP_NOWAIT); |
104699c0 | 690 | cpumask_copy(old_mask, tsk_cpus_allowed(current)); |
21dbeb91 | 691 | set_cpus_allowed_ptr(current, cpumask_of(boot_cpuid)); |
1da177e4 | 692 | |
757cbd46 | 693 | if (smp_ops && smp_ops->setup_cpu) |
8cffc6ac | 694 | smp_ops->setup_cpu(boot_cpuid); |
1da177e4 | 695 | |
bfb9126d AB |
696 | set_cpus_allowed_ptr(current, old_mask); |
697 | ||
698 | free_cpumask_var(old_mask); | |
4b703a23 | 699 | |
d7294445 BH |
700 | if (smp_ops && smp_ops->bringup_done) |
701 | smp_ops->bringup_done(); | |
702 | ||
4b703a23 | 703 | dump_numa_cpu_topology(); |
d7294445 | 704 | |
1da177e4 LT |
705 | } |
706 | ||
e1f0ece1 MN |
707 | int arch_sd_sibling_asym_packing(void) |
708 | { | |
709 | if (cpu_has_feature(CPU_FTR_ASYM_SMT)) { | |
710 | printk_once(KERN_INFO "Enabling Asymmetric SMT scheduling\n"); | |
711 | return SD_ASYM_PACKING; | |
712 | } | |
713 | return 0; | |
714 | } | |
715 | ||
1da177e4 LT |
716 | #ifdef CONFIG_HOTPLUG_CPU |
717 | int __cpu_disable(void) | |
718 | { | |
440a0857 | 719 | struct device_node *l2_cache; |
e2075f79 NL |
720 | int cpu = smp_processor_id(); |
721 | int base, i; | |
722 | int err; | |
1da177e4 | 723 | |
e2075f79 NL |
724 | if (!smp_ops->cpu_disable) |
725 | return -ENOSYS; | |
726 | ||
727 | err = smp_ops->cpu_disable(); | |
728 | if (err) | |
729 | return err; | |
730 | ||
731 | /* Update sibling maps */ | |
99d86705 | 732 | base = cpu_first_thread_sibling(cpu); |
e2075f79 | 733 | for (i = 0; i < threads_per_core; i++) { |
cc1ba8ea AB |
734 | cpumask_clear_cpu(cpu, cpu_sibling_mask(base + i)); |
735 | cpumask_clear_cpu(base + i, cpu_sibling_mask(cpu)); | |
736 | cpumask_clear_cpu(cpu, cpu_core_mask(base + i)); | |
737 | cpumask_clear_cpu(base + i, cpu_core_mask(cpu)); | |
440a0857 NL |
738 | } |
739 | ||
740 | l2_cache = cpu_to_l2cache(cpu); | |
741 | for_each_present_cpu(i) { | |
742 | struct device_node *np = cpu_to_l2cache(i); | |
743 | if (!np) | |
744 | continue; | |
745 | if (np == l2_cache) { | |
cc1ba8ea AB |
746 | cpumask_clear_cpu(cpu, cpu_core_mask(i)); |
747 | cpumask_clear_cpu(i, cpu_core_mask(cpu)); | |
440a0857 NL |
748 | } |
749 | of_node_put(np); | |
e2075f79 | 750 | } |
440a0857 NL |
751 | of_node_put(l2_cache); |
752 | ||
e2075f79 NL |
753 | |
754 | return 0; | |
1da177e4 LT |
755 | } |
756 | ||
757 | void __cpu_die(unsigned int cpu) | |
758 | { | |
759 | if (smp_ops->cpu_die) | |
760 | smp_ops->cpu_die(cpu); | |
761 | } | |
d0174c72 NF |
762 | |
763 | static DEFINE_MUTEX(powerpc_cpu_hotplug_driver_mutex); | |
764 | ||
765 | void cpu_hotplug_driver_lock() | |
766 | { | |
767 | mutex_lock(&powerpc_cpu_hotplug_driver_mutex); | |
768 | } | |
769 | ||
770 | void cpu_hotplug_driver_unlock() | |
771 | { | |
772 | mutex_unlock(&powerpc_cpu_hotplug_driver_mutex); | |
773 | } | |
abb17f9c MM |
774 | |
775 | void cpu_die(void) | |
776 | { | |
777 | if (ppc_md.cpu_die) | |
778 | ppc_md.cpu_die(); | |
fa3f82c8 BH |
779 | |
780 | /* If we return, we re-enter start_secondary */ | |
781 | start_secondary_resume(); | |
abb17f9c | 782 | } |
fa3f82c8 | 783 | |
1da177e4 | 784 | #endif |