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42682c6c JH |
1 | /* |
2 | * Copyright (C) 2009,2010,2011 Imagination Technologies Ltd. | |
3 | * | |
4 | * Copyright (C) 2002 ARM Limited, All Rights Reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/atomic.h> | |
96498144 | 11 | #include <linux/completion.h> |
42682c6c JH |
12 | #include <linux/delay.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/cache.h> | |
18 | #include <linux/profile.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/err.h> | |
22 | #include <linux/cpu.h> | |
23 | #include <linux/smp.h> | |
24 | #include <linux/seq_file.h> | |
25 | #include <linux/irq.h> | |
26 | #include <linux/bootmem.h> | |
27 | ||
28 | #include <asm/cacheflush.h> | |
29 | #include <asm/cachepart.h> | |
30 | #include <asm/core_reg.h> | |
31 | #include <asm/cpu.h> | |
9e712963 JH |
32 | #include <asm/global_lock.h> |
33 | #include <asm/metag_mem.h> | |
42682c6c JH |
34 | #include <asm/mmu_context.h> |
35 | #include <asm/pgtable.h> | |
36 | #include <asm/pgalloc.h> | |
37 | #include <asm/processor.h> | |
38 | #include <asm/setup.h> | |
39 | #include <asm/tlbflush.h> | |
40 | #include <asm/hwthread.h> | |
41 | #include <asm/traps.h> | |
42 | ||
9e712963 JH |
43 | #define SYSC_DCPART(n) (SYSC_DCPART0 + SYSC_xCPARTn_STRIDE * (n)) |
44 | #define SYSC_ICPART(n) (SYSC_ICPART0 + SYSC_xCPARTn_STRIDE * (n)) | |
45 | ||
42682c6c JH |
46 | DECLARE_PER_CPU(PTBI, pTBI); |
47 | ||
48 | void *secondary_data_stack; | |
49 | ||
50 | /* | |
51 | * structures for inter-processor calls | |
52 | * - A collection of single bit ipi messages. | |
53 | */ | |
54 | struct ipi_data { | |
55 | spinlock_t lock; | |
56 | unsigned long ipi_count; | |
57 | unsigned long bits; | |
58 | }; | |
59 | ||
60 | static DEFINE_PER_CPU(struct ipi_data, ipi_data) = { | |
61 | .lock = __SPIN_LOCK_UNLOCKED(ipi_data.lock), | |
62 | }; | |
63 | ||
64 | static DEFINE_SPINLOCK(boot_lock); | |
65 | ||
96498144 JH |
66 | static DECLARE_COMPLETION(cpu_running); |
67 | ||
42682c6c JH |
68 | /* |
69 | * "thread" is assumed to be a valid Meta hardware thread ID. | |
70 | */ | |
54be16e7 | 71 | int boot_secondary(unsigned int thread, struct task_struct *idle) |
42682c6c JH |
72 | { |
73 | u32 val; | |
74 | ||
75 | /* | |
76 | * set synchronisation state between this boot processor | |
77 | * and the secondary one | |
78 | */ | |
79 | spin_lock(&boot_lock); | |
80 | ||
81 | core_reg_write(TXUPC_ID, 0, thread, (unsigned int)secondary_startup); | |
82 | core_reg_write(TXUPC_ID, 1, thread, 0); | |
83 | ||
84 | /* | |
85 | * Give the thread privilege (PSTAT) and clear potentially problematic | |
86 | * bits in the process (namely ISTAT, CBMarker, CBMarkerI, LSM_STEP). | |
87 | */ | |
88 | core_reg_write(TXUCT_ID, TXSTATUS_REGNUM, thread, TXSTATUS_PSTAT_BIT); | |
89 | ||
90 | /* Clear the minim enable bit. */ | |
91 | val = core_reg_read(TXUCT_ID, TXPRIVEXT_REGNUM, thread); | |
92 | core_reg_write(TXUCT_ID, TXPRIVEXT_REGNUM, thread, val & ~0x80); | |
93 | ||
94 | /* | |
95 | * set the ThreadEnable bit (0x1) in the TXENABLE register | |
96 | * for the specified thread - off it goes! | |
97 | */ | |
98 | val = core_reg_read(TXUCT_ID, TXENABLE_REGNUM, thread); | |
99 | core_reg_write(TXUCT_ID, TXENABLE_REGNUM, thread, val | 0x1); | |
100 | ||
101 | /* | |
102 | * now the secondary core is starting up let it run its | |
103 | * calibrations, then wait for it to finish | |
104 | */ | |
105 | spin_unlock(&boot_lock); | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
9e712963 JH |
110 | /** |
111 | * describe_cachepart_change: describe a change to cache partitions. | |
112 | * @thread: Hardware thread number. | |
113 | * @label: Label of cache type, e.g. "dcache" or "icache". | |
114 | * @sz: Total size of the cache. | |
115 | * @old: Old cache partition configuration (*CPART* register). | |
116 | * @new: New cache partition configuration (*CPART* register). | |
117 | * | |
118 | * If the cache partition has changed, prints a message to the log describing | |
119 | * those changes. | |
120 | */ | |
54be16e7 PG |
121 | static void describe_cachepart_change(unsigned int thread, const char *label, |
122 | unsigned int sz, unsigned int old, | |
123 | unsigned int new) | |
9e712963 JH |
124 | { |
125 | unsigned int lor1, land1, gor1, gand1; | |
126 | unsigned int lor2, land2, gor2, gand2; | |
127 | unsigned int diff = old ^ new; | |
128 | ||
129 | if (!diff) | |
130 | return; | |
131 | ||
132 | pr_info("Thread %d: %s partition changed:", thread, label); | |
133 | if (diff & (SYSC_xCPARTL_OR_BITS | SYSC_xCPARTL_AND_BITS)) { | |
134 | lor1 = (old & SYSC_xCPARTL_OR_BITS) >> SYSC_xCPARTL_OR_S; | |
135 | lor2 = (new & SYSC_xCPARTL_OR_BITS) >> SYSC_xCPARTL_OR_S; | |
136 | land1 = (old & SYSC_xCPARTL_AND_BITS) >> SYSC_xCPARTL_AND_S; | |
137 | land2 = (new & SYSC_xCPARTL_AND_BITS) >> SYSC_xCPARTL_AND_S; | |
138 | pr_cont(" L:%#x+%#x->%#x+%#x", | |
139 | (lor1 * sz) >> 4, | |
140 | ((land1 + 1) * sz) >> 4, | |
141 | (lor2 * sz) >> 4, | |
142 | ((land2 + 1) * sz) >> 4); | |
143 | } | |
144 | if (diff & (SYSC_xCPARTG_OR_BITS | SYSC_xCPARTG_AND_BITS)) { | |
145 | gor1 = (old & SYSC_xCPARTG_OR_BITS) >> SYSC_xCPARTG_OR_S; | |
146 | gor2 = (new & SYSC_xCPARTG_OR_BITS) >> SYSC_xCPARTG_OR_S; | |
147 | gand1 = (old & SYSC_xCPARTG_AND_BITS) >> SYSC_xCPARTG_AND_S; | |
148 | gand2 = (new & SYSC_xCPARTG_AND_BITS) >> SYSC_xCPARTG_AND_S; | |
149 | pr_cont(" G:%#x+%#x->%#x+%#x", | |
150 | (gor1 * sz) >> 4, | |
151 | ((gand1 + 1) * sz) >> 4, | |
152 | (gor2 * sz) >> 4, | |
153 | ((gand2 + 1) * sz) >> 4); | |
154 | } | |
155 | if (diff & SYSC_CWRMODE_BIT) | |
156 | pr_cont(" %sWR", | |
157 | (new & SYSC_CWRMODE_BIT) ? "+" : "-"); | |
158 | if (diff & SYSC_DCPART_GCON_BIT) | |
159 | pr_cont(" %sGCOn", | |
160 | (new & SYSC_DCPART_GCON_BIT) ? "+" : "-"); | |
161 | pr_cont("\n"); | |
162 | } | |
163 | ||
164 | /** | |
165 | * setup_smp_cache: ensure cache coherency for new SMP thread. | |
166 | * @thread: New hardware thread number. | |
167 | * | |
168 | * Ensures that coherency is enabled and that the threads share the same cache | |
169 | * partitions. | |
170 | */ | |
54be16e7 | 171 | static void setup_smp_cache(unsigned int thread) |
9e712963 JH |
172 | { |
173 | unsigned int this_thread, lflags; | |
174 | unsigned int dcsz, dcpart_this, dcpart_old, dcpart_new; | |
175 | unsigned int icsz, icpart_old, icpart_new; | |
176 | ||
177 | /* | |
178 | * Copy over the current thread's cache partition configuration to the | |
179 | * new thread so that they share cache partitions. | |
180 | */ | |
181 | __global_lock2(lflags); | |
182 | this_thread = hard_processor_id(); | |
183 | /* Share dcache partition */ | |
184 | dcpart_this = metag_in32(SYSC_DCPART(this_thread)); | |
185 | dcpart_old = metag_in32(SYSC_DCPART(thread)); | |
186 | dcpart_new = dcpart_this; | |
187 | #if PAGE_OFFSET < LINGLOBAL_BASE | |
188 | /* | |
189 | * For the local data cache to be coherent the threads must also have | |
190 | * GCOn enabled. | |
191 | */ | |
192 | dcpart_new |= SYSC_DCPART_GCON_BIT; | |
193 | metag_out32(dcpart_new, SYSC_DCPART(this_thread)); | |
194 | #endif | |
195 | metag_out32(dcpart_new, SYSC_DCPART(thread)); | |
196 | /* Share icache partition too */ | |
197 | icpart_new = metag_in32(SYSC_ICPART(this_thread)); | |
198 | icpart_old = metag_in32(SYSC_ICPART(thread)); | |
199 | metag_out32(icpart_new, SYSC_ICPART(thread)); | |
200 | __global_unlock2(lflags); | |
201 | ||
202 | /* | |
203 | * Log if the cache partitions were altered so the user is aware of any | |
204 | * potential unintentional cache wastage. | |
205 | */ | |
206 | dcsz = get_dcache_size(); | |
207 | icsz = get_dcache_size(); | |
208 | describe_cachepart_change(this_thread, "dcache", dcsz, | |
209 | dcpart_this, dcpart_new); | |
210 | describe_cachepart_change(thread, "dcache", dcsz, | |
211 | dcpart_old, dcpart_new); | |
212 | describe_cachepart_change(thread, "icache", icsz, | |
213 | icpart_old, icpart_new); | |
214 | } | |
215 | ||
54be16e7 | 216 | int __cpu_up(unsigned int cpu, struct task_struct *idle) |
42682c6c JH |
217 | { |
218 | unsigned int thread = cpu_2_hwthread_id[cpu]; | |
219 | int ret; | |
220 | ||
221 | load_pgd(swapper_pg_dir, thread); | |
222 | ||
223 | flush_tlb_all(); | |
224 | ||
9e712963 JH |
225 | setup_smp_cache(thread); |
226 | ||
42682c6c JH |
227 | /* |
228 | * Tell the secondary CPU where to find its idle thread's stack. | |
229 | */ | |
230 | secondary_data_stack = task_stack_page(idle); | |
231 | ||
232 | wmb(); | |
233 | ||
234 | /* | |
235 | * Now bring the CPU into our world. | |
236 | */ | |
237 | ret = boot_secondary(thread, idle); | |
238 | if (ret == 0) { | |
42682c6c JH |
239 | /* |
240 | * CPU was successfully started, wait for it | |
241 | * to come online or time out. | |
242 | */ | |
96498144 JH |
243 | wait_for_completion_timeout(&cpu_running, |
244 | msecs_to_jiffies(1000)); | |
42682c6c JH |
245 | |
246 | if (!cpu_online(cpu)) | |
247 | ret = -EIO; | |
248 | } | |
249 | ||
250 | secondary_data_stack = NULL; | |
251 | ||
252 | if (ret) { | |
253 | pr_crit("CPU%u: processor failed to boot\n", cpu); | |
254 | ||
255 | /* | |
256 | * FIXME: We need to clean up the new idle thread. --rmk | |
257 | */ | |
258 | } | |
259 | ||
260 | return ret; | |
261 | } | |
262 | ||
263 | #ifdef CONFIG_HOTPLUG_CPU | |
264 | static DECLARE_COMPLETION(cpu_killed); | |
265 | ||
266 | /* | |
267 | * __cpu_disable runs on the processor to be shutdown. | |
268 | */ | |
54be16e7 | 269 | int __cpu_disable(void) |
42682c6c JH |
270 | { |
271 | unsigned int cpu = smp_processor_id(); | |
42682c6c JH |
272 | |
273 | /* | |
274 | * Take this CPU offline. Once we clear this, we can't return, | |
275 | * and we must not schedule until we're ready to give up the cpu. | |
276 | */ | |
277 | set_cpu_online(cpu, false); | |
278 | ||
279 | /* | |
280 | * OK - migrate IRQs away from this CPU | |
281 | */ | |
282 | migrate_irqs(); | |
283 | ||
284 | /* | |
285 | * Flush user cache and TLB mappings, and then remove this CPU | |
286 | * from the vm mask set of all processes. | |
287 | */ | |
288 | flush_cache_all(); | |
289 | local_flush_tlb_all(); | |
290 | ||
42748752 | 291 | clear_tasks_mm_cpumask(cpu); |
42682c6c JH |
292 | |
293 | return 0; | |
294 | } | |
295 | ||
296 | /* | |
297 | * called on the thread which is asking for a CPU to be shutdown - | |
298 | * waits until shutdown has completed, or it is timed out. | |
299 | */ | |
54be16e7 | 300 | void __cpu_die(unsigned int cpu) |
42682c6c JH |
301 | { |
302 | if (!wait_for_completion_timeout(&cpu_killed, msecs_to_jiffies(1))) | |
303 | pr_err("CPU%u: unable to kill\n", cpu); | |
304 | } | |
305 | ||
306 | /* | |
307 | * Called from the idle thread for the CPU which has been shutdown. | |
308 | * | |
309 | * Note that we do not return from this function. If this cpu is | |
310 | * brought online again it will need to run secondary_startup(). | |
311 | */ | |
54be16e7 | 312 | void cpu_die(void) |
42682c6c JH |
313 | { |
314 | local_irq_disable(); | |
315 | idle_task_exit(); | |
316 | ||
317 | complete(&cpu_killed); | |
318 | ||
319 | asm ("XOR TXENABLE, D0Re0,D0Re0\n"); | |
320 | } | |
321 | #endif /* CONFIG_HOTPLUG_CPU */ | |
322 | ||
323 | /* | |
324 | * Called by both boot and secondaries to move global data into | |
325 | * per-processor storage. | |
326 | */ | |
54be16e7 | 327 | void smp_store_cpu_info(unsigned int cpuid) |
42682c6c JH |
328 | { |
329 | struct cpuinfo_metag *cpu_info = &per_cpu(cpu_data, cpuid); | |
330 | ||
331 | cpu_info->loops_per_jiffy = loops_per_jiffy; | |
332 | } | |
333 | ||
334 | /* | |
335 | * This is the secondary CPU boot entry. We're using this CPUs | |
336 | * idle thread stack and the global page tables. | |
337 | */ | |
338 | asmlinkage void secondary_start_kernel(void) | |
339 | { | |
340 | struct mm_struct *mm = &init_mm; | |
341 | unsigned int cpu = smp_processor_id(); | |
342 | ||
343 | /* | |
344 | * All kernel threads share the same mm context; grab a | |
345 | * reference and switch to it. | |
346 | */ | |
347 | atomic_inc(&mm->mm_users); | |
348 | atomic_inc(&mm->mm_count); | |
349 | current->active_mm = mm; | |
350 | cpumask_set_cpu(cpu, mm_cpumask(mm)); | |
351 | enter_lazy_tlb(mm, current); | |
352 | local_flush_tlb_all(); | |
353 | ||
354 | /* | |
355 | * TODO: Some day it might be useful for each Linux CPU to | |
356 | * have its own TBI structure. That would allow each Linux CPU | |
357 | * to run different interrupt handlers for the same IRQ | |
358 | * number. | |
359 | * | |
360 | * For now, simply copying the pointer to the boot CPU's TBI | |
361 | * structure is sufficient because we always want to run the | |
362 | * same interrupt handler whatever CPU takes the interrupt. | |
363 | */ | |
364 | per_cpu(pTBI, cpu) = __TBI(TBID_ISTAT_BIT); | |
365 | ||
366 | if (!per_cpu(pTBI, cpu)) | |
367 | panic("No TBI found!"); | |
368 | ||
369 | per_cpu_trap_init(cpu); | |
370 | ||
371 | preempt_disable(); | |
372 | ||
3d6b7bb0 | 373 | setup_priv(); |
42682c6c | 374 | |
42682c6c | 375 | notify_cpu_starting(cpu); |
42682c6c JH |
376 | |
377 | pr_info("CPU%u (thread %u): Booted secondary processor\n", | |
378 | cpu, cpu_2_hwthread_id[cpu]); | |
379 | ||
380 | calibrate_delay(); | |
381 | smp_store_cpu_info(cpu); | |
382 | ||
383 | /* | |
384 | * OK, now it's safe to let the boot CPU continue | |
385 | */ | |
386 | set_cpu_online(cpu, true); | |
96498144 | 387 | complete(&cpu_running); |
42682c6c | 388 | |
234c7f1a JH |
389 | /* |
390 | * Enable local interrupts. | |
391 | */ | |
392 | tbi_startup_interrupt(TBID_SIGNUM_TRT); | |
393 | local_irq_enable(); | |
394 | ||
42682c6c JH |
395 | /* |
396 | * OK, it's off to the idle thread for us | |
397 | */ | |
d1dba0fc | 398 | cpu_startup_entry(CPUHP_ONLINE); |
42682c6c JH |
399 | } |
400 | ||
401 | void __init smp_cpus_done(unsigned int max_cpus) | |
402 | { | |
403 | int cpu; | |
404 | unsigned long bogosum = 0; | |
405 | ||
406 | for_each_online_cpu(cpu) | |
407 | bogosum += per_cpu(cpu_data, cpu).loops_per_jiffy; | |
408 | ||
409 | pr_info("SMP: Total of %d processors activated (%lu.%02lu BogoMIPS).\n", | |
410 | num_online_cpus(), | |
411 | bogosum / (500000/HZ), | |
412 | (bogosum / (5000/HZ)) % 100); | |
413 | } | |
414 | ||
415 | void __init smp_prepare_cpus(unsigned int max_cpus) | |
416 | { | |
417 | unsigned int cpu = smp_processor_id(); | |
418 | ||
419 | init_new_context(current, &init_mm); | |
420 | current_thread_info()->cpu = cpu; | |
421 | ||
422 | smp_store_cpu_info(cpu); | |
423 | init_cpu_present(cpu_possible_mask); | |
424 | } | |
425 | ||
426 | void __init smp_prepare_boot_cpu(void) | |
427 | { | |
428 | unsigned int cpu = smp_processor_id(); | |
429 | ||
430 | per_cpu(pTBI, cpu) = __TBI(TBID_ISTAT_BIT); | |
431 | ||
432 | if (!per_cpu(pTBI, cpu)) | |
433 | panic("No TBI found!"); | |
434 | } | |
435 | ||
436 | static void smp_cross_call(cpumask_t callmap, enum ipi_msg_type msg); | |
437 | ||
438 | static void send_ipi_message(const struct cpumask *mask, enum ipi_msg_type msg) | |
439 | { | |
440 | unsigned long flags; | |
441 | unsigned int cpu; | |
442 | cpumask_t map; | |
443 | ||
444 | cpumask_clear(&map); | |
445 | local_irq_save(flags); | |
446 | ||
447 | for_each_cpu(cpu, mask) { | |
448 | struct ipi_data *ipi = &per_cpu(ipi_data, cpu); | |
449 | ||
450 | spin_lock(&ipi->lock); | |
451 | ||
452 | /* | |
453 | * KICK interrupts are queued in hardware so we'll get | |
454 | * multiple interrupts if we call smp_cross_call() | |
455 | * multiple times for one msg. The problem is that we | |
456 | * only have one bit for each message - we can't queue | |
457 | * them in software. | |
458 | * | |
459 | * The first time through ipi_handler() we'll clear | |
460 | * the msg bit, having done all the work. But when we | |
461 | * return we'll get _another_ interrupt (and another, | |
462 | * and another until we've handled all the queued | |
463 | * KICKs). Running ipi_handler() when there's no work | |
464 | * to do is bad because that's how kick handler | |
465 | * chaining detects who the KICK was intended for. | |
466 | * See arch/metag/kernel/kick.c for more details. | |
467 | * | |
468 | * So only add 'cpu' to 'map' if we haven't already | |
469 | * queued a KICK interrupt for 'msg'. | |
470 | */ | |
471 | if (!(ipi->bits & (1 << msg))) { | |
472 | ipi->bits |= 1 << msg; | |
473 | cpumask_set_cpu(cpu, &map); | |
474 | } | |
475 | ||
476 | spin_unlock(&ipi->lock); | |
477 | } | |
478 | ||
479 | /* | |
480 | * Call the platform specific cross-CPU call function. | |
481 | */ | |
482 | smp_cross_call(map, msg); | |
483 | ||
484 | local_irq_restore(flags); | |
485 | } | |
486 | ||
487 | void arch_send_call_function_ipi_mask(const struct cpumask *mask) | |
488 | { | |
489 | send_ipi_message(mask, IPI_CALL_FUNC); | |
490 | } | |
491 | ||
492 | void arch_send_call_function_single_ipi(int cpu) | |
493 | { | |
494 | send_ipi_message(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE); | |
495 | } | |
496 | ||
497 | void show_ipi_list(struct seq_file *p) | |
498 | { | |
499 | unsigned int cpu; | |
500 | ||
501 | seq_puts(p, "IPI:"); | |
502 | ||
503 | for_each_present_cpu(cpu) | |
504 | seq_printf(p, " %10lu", per_cpu(ipi_data, cpu).ipi_count); | |
505 | ||
506 | seq_putc(p, '\n'); | |
507 | } | |
508 | ||
509 | static DEFINE_SPINLOCK(stop_lock); | |
510 | ||
511 | /* | |
512 | * Main handler for inter-processor interrupts | |
513 | * | |
514 | * For Meta, the ipimask now only identifies a single | |
515 | * category of IPI (Bit 1 IPIs have been replaced by a | |
516 | * different mechanism): | |
517 | * | |
518 | * Bit 0 - Inter-processor function call | |
519 | */ | |
520 | static int do_IPI(struct pt_regs *regs) | |
521 | { | |
522 | unsigned int cpu = smp_processor_id(); | |
523 | struct ipi_data *ipi = &per_cpu(ipi_data, cpu); | |
524 | struct pt_regs *old_regs = set_irq_regs(regs); | |
525 | unsigned long msgs, nextmsg; | |
526 | int handled = 0; | |
527 | ||
528 | ipi->ipi_count++; | |
529 | ||
530 | spin_lock(&ipi->lock); | |
531 | msgs = ipi->bits; | |
532 | nextmsg = msgs & -msgs; | |
533 | ipi->bits &= ~nextmsg; | |
534 | spin_unlock(&ipi->lock); | |
535 | ||
536 | if (nextmsg) { | |
537 | handled = 1; | |
538 | ||
539 | nextmsg = ffz(~nextmsg); | |
540 | switch (nextmsg) { | |
541 | case IPI_RESCHEDULE: | |
542 | scheduler_ipi(); | |
543 | break; | |
544 | ||
545 | case IPI_CALL_FUNC: | |
546 | generic_smp_call_function_interrupt(); | |
547 | break; | |
548 | ||
549 | case IPI_CALL_FUNC_SINGLE: | |
550 | generic_smp_call_function_single_interrupt(); | |
551 | break; | |
552 | ||
553 | default: | |
554 | pr_crit("CPU%u: Unknown IPI message 0x%lx\n", | |
555 | cpu, nextmsg); | |
556 | break; | |
557 | } | |
558 | } | |
559 | ||
560 | set_irq_regs(old_regs); | |
561 | ||
562 | return handled; | |
563 | } | |
564 | ||
565 | void smp_send_reschedule(int cpu) | |
566 | { | |
567 | send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE); | |
568 | } | |
569 | ||
570 | static void stop_this_cpu(void *data) | |
571 | { | |
572 | unsigned int cpu = smp_processor_id(); | |
573 | ||
574 | if (system_state == SYSTEM_BOOTING || | |
575 | system_state == SYSTEM_RUNNING) { | |
576 | spin_lock(&stop_lock); | |
577 | pr_crit("CPU%u: stopping\n", cpu); | |
578 | dump_stack(); | |
579 | spin_unlock(&stop_lock); | |
580 | } | |
581 | ||
582 | set_cpu_online(cpu, false); | |
583 | ||
584 | local_irq_disable(); | |
585 | ||
586 | hard_processor_halt(HALT_OK); | |
587 | } | |
588 | ||
589 | void smp_send_stop(void) | |
590 | { | |
591 | smp_call_function(stop_this_cpu, NULL, 0); | |
592 | } | |
593 | ||
594 | /* | |
595 | * not supported here | |
596 | */ | |
597 | int setup_profiling_timer(unsigned int multiplier) | |
598 | { | |
599 | return -EINVAL; | |
600 | } | |
601 | ||
602 | /* | |
603 | * We use KICKs for inter-processor interrupts. | |
604 | * | |
605 | * For every CPU in "callmap" the IPI data must already have been | |
606 | * stored in that CPU's "ipi_data" member prior to calling this | |
607 | * function. | |
608 | */ | |
609 | static void kick_raise_softirq(cpumask_t callmap, unsigned int irq) | |
610 | { | |
611 | int cpu; | |
612 | ||
613 | for_each_cpu(cpu, &callmap) { | |
614 | unsigned int thread; | |
615 | ||
616 | thread = cpu_2_hwthread_id[cpu]; | |
617 | ||
618 | BUG_ON(thread == BAD_HWTHREAD_ID); | |
619 | ||
620 | metag_out32(1, T0KICKI + (thread * TnXKICK_STRIDE)); | |
621 | } | |
622 | } | |
623 | ||
624 | static TBIRES ipi_handler(TBIRES State, int SigNum, int Triggers, | |
625 | int Inst, PTBI pTBI, int *handled) | |
626 | { | |
627 | *handled = do_IPI((struct pt_regs *)State.Sig.pCtx); | |
628 | ||
629 | return State; | |
630 | } | |
631 | ||
632 | static struct kick_irq_handler ipi_irq = { | |
633 | .func = ipi_handler, | |
634 | }; | |
635 | ||
636 | static void smp_cross_call(cpumask_t callmap, enum ipi_msg_type msg) | |
637 | { | |
638 | kick_raise_softirq(callmap, 1); | |
639 | } | |
640 | ||
641 | static inline unsigned int get_core_count(void) | |
642 | { | |
643 | int i; | |
644 | unsigned int ret = 0; | |
645 | ||
646 | for (i = 0; i < CONFIG_NR_CPUS; i++) { | |
647 | if (core_reg_read(TXUCT_ID, TXENABLE_REGNUM, i)) | |
648 | ret++; | |
649 | } | |
650 | ||
651 | return ret; | |
652 | } | |
653 | ||
654 | /* | |
655 | * Initialise the CPU possible map early - this describes the CPUs | |
656 | * which may be present or become present in the system. | |
657 | */ | |
658 | void __init smp_init_cpus(void) | |
659 | { | |
660 | unsigned int i, ncores = get_core_count(); | |
661 | ||
662 | /* If no hwthread_map early param was set use default mapping */ | |
663 | for (i = 0; i < NR_CPUS; i++) | |
664 | if (cpu_2_hwthread_id[i] == BAD_HWTHREAD_ID) { | |
665 | cpu_2_hwthread_id[i] = i; | |
666 | hwthread_id_2_cpu[i] = i; | |
667 | } | |
668 | ||
669 | for (i = 0; i < ncores; i++) | |
670 | set_cpu_possible(i, true); | |
671 | ||
672 | kick_register_func(&ipi_irq); | |
673 | } |